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Problems with KRX3A

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m5kvk

Problems with KRX3A

Hi there
I bought a s/h K3S a couple of years ago (SN 10901). It has a KRX3A installed, but I’ve never tried to use it until now. When I enabled the sub receiver this morning, I found I was getting no signal.

I’ve checked various CONFIG settings and it’s set to use the MAIN ANT and it’s AF is independent of the K3S. In an attempt to make progress, I reviewed the installation instructions.

Item 4, after enabling TECH MD, is Tap DISP and rotate VFO B to display SYN1 and SYN2. I do not see these items. Any idea how to debug this?

73

Gareth, M5KVK
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Richard Thorne-4

Re: Problems with KRX3A

Gareth,

You probably don't have the correct antenna port assigned to the sub
receiver. I'm not in front of my rig, but I believe you need to push
and hold A/B (B Set) to get to the sub receiver, at that point be sure
the correct antenna port is selected.

Rich - N5ZC

On 5/26/2020 10:05 AM, Gareth M5KVK wrote:

> Hi there
> I bought a s/h K3S a couple of years ago (SN 10901). It has a KRX3A installed, but I’ve never tried to use it until now. When I enabled the sub receiver this morning, I found I was getting no signal.
>
> I’ve checked various CONFIG settings and it’s set to use the MAIN ANT and it’s AF is independent of the K3S. In an attempt to make progress, I reviewed the installation instructions.
>
> Item 4, after enabling TECH MD, is Tap DISP and rotate VFO B to display SYN1 and SYN2. I do not see these items. Any idea how to debug this?
>
> 73
>
> Gareth, M5KVK
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
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>
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m5kvk

Re: Problems with KRX3A

Thanks, Richard
There is no ATU, so there is only the one ANT to select. However, I have checked that CONFIG KRX3 has Ant=ATu (even though there is no ATU, only this or BNC are offered as options)

Gareth

On 26/05/2020, 16:31, "Richard Thorne" <[hidden email]> wrote:

Gareth,

You probably don't have the correct antenna port assigned to the sub
receiver. I'm not in front of my rig, but I believe you need to push
and hold A/B (B Set) to get to the sub receiver, at that point be sure
the correct antenna port is selected.

Rich - N5ZC

On 5/26/2020 10:05 AM, Gareth M5KVK wrote:
> Hi there
> I bought a s/h K3S a couple of years ago (SN 10901). It has a KRX3A installed, but I’ve never tried to use it until now. When I enabled the sub receiver this morning, I found I was getting no signal.
>
> I’ve checked various CONFIG settings and it’s set to use the MAIN ANT and it’s AF is independent of the K3S. In an attempt to make progress, I reviewed the installation instructions.
>
> Item 4, after enabling TECH MD, is Tap DISP and rotate VFO B to display SYN1 and SYN2. I do not see these items. Any idea how to debug this?
>
> 73
>
> Gareth, M5KVK

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m5kvk

Re: Problems with KRX3A

In reply to this post by m5kvk

Thanks for that extra instruction. The manual omits the ‘Tap MENU to exit MENU’ instruction, so I was looking for SYN on the config menu.

Makes no difference though, the values for SYN1 and SYN2 are OK, but there’s no signal from the SUB.

Gareth

From: w4sc <[hidden email]>
Date: Tuesday, 26 May 2020 at 21:45
To: "[hidden email]" <[hidden email]>
Subject: Re: [Elecraft] Problems with KRX3A

To ckeck KSYN3

HOLD CONFIG
VFO-B to TECH-MD
VFO-A to turn TECH-MD ON
Tap MENU to exit MENU
Rotate VFO-B (usually cw) until SYN1 ..SYN2 are shown in display if OK,,, “OK” displays

Sent from Mail<https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10

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m5kvk

Re: Problems with KRX3A

In reply to this post by m5kvk

I tried that, Richard.
ANT definitely says MAIN but still no signal.

Gareth

On 26/05/2020, 18:40, "Richard Thorne" <[hidden email]> wrote:

Gareth,

Try this.

- Turn on the sub receiver by pushing sub
- Push and hold B Set so the display shows b set
- Be sure the ant shows Main and not AUX. If it shows AUX push the ANT
button to toggle between the two.

May not be the problem but I've found for some reason my sub receiver is
on the Aux antenna. My rig doesn't have the ant tuner either.

Rich - N5ZC

On 5/26/2020 11:21 AM, Gareth M5KVK wrote:
> Thanks, Richard
> There is no ATU, so there is only the one ANT to select. However, I have checked that CONFIG KRX3 has Ant=ATu (even though there is no ATU, only this or BNC are offered as options)
>
> Gareth
>
> On 26/05/2020, 16:31, "Richard Thorne" <[hidden email]> wrote:
>
> Gareth,
>
> You probably don't have the correct antenna port assigned to the sub
> receiver. I'm not in front of my rig, but I believe you need to push
> and hold A/B (B Set) to get to the sub receiver, at that point be sure
> the correct antenna port is selected.
>
> Rich - N5ZC
>
> On 5/26/2020 10:05 AM, Gareth M5KVK wrote:
> > Hi there
> > I bought a s/h K3S a couple of years ago (SN 10901). It has a KRX3A installed, but I’ve never tried to use it until now. When I enabled the sub receiver this morning, I found I was getting no signal.
> >
> > I’ve checked various CONFIG settings and it’s set to use the MAIN ANT and it’s AF is independent of the K3S. In an attempt to make progress, I reviewed the installation instructions.
> >
> > Item 4, after enabling TECH MD, is Tap DISP and rotate VFO B to display SYN1 and SYN2. I do not see these items. Any idea how to debug this?
> >
> > 73
> >
> > Gareth, M5KVK
>
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m5kvk

Re: Problems with KRX3A

Thanks
I’m going to open the rig up and check that it’s installed properly first. Then it will be time to contact support.

Gareth
________________________________
From: Richard Thorne <[hidden email]>
Sent: Wednesday, May 27, 2020 2:25:04 PM
To: Gareth M5KVK <[hidden email]>
Subject: Re: [Elecraft] Problems with KRX3A

Gareth,

Ok, it sure would have been an easy fix.

It may be time for an email to Elecraft Support if you hadn't sent them
an email already.

I hope it turns out to be an easy fix.

Rich - N5ZC

On 5/27/2020 8:21 AM, Gareth M5KVK wrote:

> I tried that, Richard.
> ANT definitely says MAIN but still no signal.
>
> Gareth
>
> On 26/05/2020, 18:40, "Richard Thorne" <[hidden email]> wrote:
>
> Gareth,
>
> Try this.
>
> - Turn on the sub receiver by pushing sub
> - Push and hold B Set so the display shows b set
> - Be sure the ant shows Main and not AUX. If it shows AUX push the ANT
> button to toggle between the two.
>
> May not be the problem but I've found for some reason my sub receiver is
> on the Aux antenna. My rig doesn't have the ant tuner either.
>
> Rich - N5ZC
>
> On 5/26/2020 11:21 AM, Gareth M5KVK wrote:
> > Thanks, Richard
> > There is no ATU, so there is only the one ANT to select. However, I have checked that CONFIG KRX3 has Ant=ATu (even though there is no ATU, only this or BNC are offered as options)
> >
> > Gareth
> >
> > On 26/05/2020, 16:31, "Richard Thorne" <[hidden email]> wrote:
> >
> > Gareth,
> >
> > You probably don't have the correct antenna port assigned to the sub
> > receiver. I'm not in front of my rig, but I believe you need to push
> > and hold A/B (B Set) to get to the sub receiver, at that point be sure
> > the correct antenna port is selected.
> >
> > Rich - N5ZC
> >
> > On 5/26/2020 10:05 AM, Gareth M5KVK wrote:
> > > Hi there
> > > I bought a s/h K3S a couple of years ago (SN 10901). It has a KRX3A installed, but I’ve never tried to use it until now. When I enabled the sub receiver this morning, I found I was getting no signal.
> > >
> > > I’ve checked various CONFIG settings and it’s set to use the MAIN ANT and it’s AF is independent of the K3S. In an attempt to make progress, I reviewed the installation instructions.
> > >
> > > Item 4, after enabling TECH MD, is Tap DISP and rotate VFO B to display SYN1 and SYN2. I do not see these items. Any idea how to debug this?
> > >
> > > 73
> > >
> > > Gareth, M5KVK
> >

Grant Youngman-2

Re: Problems with KRX3A

In reply to this post by m5kvk

Have you checked the installation of the receiver module? Meaning that the two small riser modules that it plugs into are properly seated to the main RF board and the KRX3. I had a dead sub-receiver problem once. I had been in the radio at some point to install an update. When reinstalling the KRX3, I had pinched one of the coax cables that’s in the vicinity of the riser nearest the front of the radio and pulled the cable out of it’s socket when reinserting the KRX3, far enough not to work, but not so far that I noticed it until the next time I tried using the sub.

Just one more idea of something to look at.

Grant NQ5T

> On May 27, 2020, at 9:21 AM, Gareth M5KVK <[hidden email]> wrote:
>
> I tried that, Richard.
> ANT definitely says MAIN but still no signal.
>
> Gareth
>
> On 26/05/2020, 18:40, "Richard Thorne" <[hidden email]> wrote:
>
> Gareth,
>
> Try this.
>
> - Turn on the sub receiver by pushing sub
> - Push and hold B Set so the display shows b set
> - Be sure the ant shows Main and not AUX. If it shows AUX push the ANT
> button to toggle between the two.
>
> May not be the problem but I've found for some reason my sub receiver is
> on the Aux antenna. My rig doesn't have the ant tuner either.
>
> Rich - N5ZC
>
> On 5/26/2020 11:21 AM, Gareth M5KVK wrote:
>> Thanks, Richard
>> There is no ATU, so there is only the one ANT to select. However, I have checked that CONFIG KRX3 has Ant=ATu (even though there is no ATU, only this or BNC are offered as options)
>>
>> Gareth
>>
>> On 26/05/2020, 16:31, "Richard Thorne" <[hidden email]> wrote:
>>
>> Gareth,
>>
>> You probably don't have the correct antenna port assigned to the sub
>> receiver. I'm not in front of my rig, but I believe you need to push
>> and hold A/B (B Set) to get to the sub receiver, at that point be sure
>> the correct antenna port is selected.
>>
>> Rich - N5ZC
>>
>> On 5/26/2020 10:05 AM, Gareth M5KVK wrote:
>>> Hi there
>>> I bought a s/h K3S a couple of years ago (SN 10901). It has a KRX3A installed, but I’ve never tried to use it until now. When I enabled the sub receiver this morning, I found I was getting no signal.
>>>
>>> I’ve checked various CONFIG settings and it’s set to use the MAIN ANT and it’s AF is independent of the K3S. In an attempt to make progress, I reviewed the installation instructions.
>>>
>>> Item 4, after enabling TECH MD, is Tap DISP and rotate VFO B to display SYN1 and SYN2. I do not see these items. Any idea how to debug this?
>>>
>>> 73
>>>
>>> Gareth, M5KVK
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
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> Message delivered to [hidden email]

m5kvk

Re: Problems with KRX3A

Great minds, Grant. That's my next step.

As I said in the OP, this was a rig bought secondhand.

Gareth M5KVK

On 27/05/2020, 14:35, "Grant Youngman" <[hidden email]> wrote:

Have you checked the installation of the receiver module? Meaning that the two small riser modules that it plugs into are properly seated to the main RF board and the KRX3. I had a dead sub-receiver problem once. I had been in the radio at some point to install an update. When reinstalling the KRX3, I had pinched one of the coax cables that’s in the vicinity of the riser nearest the front of the radio and pulled the cable out of it’s socket when reinserting the KRX3, far enough not to work, but not so far that I noticed it until the next time I tried using the sub.

Just one more idea of something to look at.

Grant NQ5T

> On May 27, 2020, at 9:21 AM, Gareth M5KVK <[hidden email]> wrote:
>
> I tried that, Richard.
> ANT definitely says MAIN but still no signal.
>
> Gareth
>
> On 26/05/2020, 18:40, "Richard Thorne" <[hidden email]> wrote:
>
> Gareth,
>
> Try this.
>
> - Turn on the sub receiver by pushing sub
> - Push and hold B Set so the display shows b set
> - Be sure the ant shows Main and not AUX. If it shows AUX push the ANT
> button to toggle between the two.
>
> May not be the problem but I've found for some reason my sub receiver is
> on the Aux antenna. My rig doesn't have the ant tuner either.
>
> Rich - N5ZC
>
> On 5/26/2020 11:21 AM, Gareth M5KVK wrote:
>> Thanks, Richard
>> There is no ATU, so there is only the one ANT to select. However, I have checked that CONFIG KRX3 has Ant=ATu (even though there is no ATU, only this or BNC are offered as options)
>>
>> Gareth
>>
>> On 26/05/2020, 16:31, "Richard Thorne" <[hidden email]> wrote:
>>
>> Gareth,
>>
>> You probably don't have the correct antenna port assigned to the sub
>> receiver. I'm not in front of my rig, but I believe you need to push
>> and hold A/B (B Set) to get to the sub receiver, at that point be sure
>> the correct antenna port is selected.
>>
>> Rich - N5ZC
>>
>> On 5/26/2020 10:05 AM, Gareth M5KVK wrote:
>>> Hi there
>>> I bought a s/h K3S a couple of years ago (SN 10901). It has a KRX3A installed, but I’ve never tried to use it until now. When I enabled the sub receiver this morning, I found I was getting no signal.
>>>
>>> I’ve checked various CONFIG settings and it’s set to use the MAIN ANT and it’s AF is independent of the K3S. In an attempt to make progress, I reviewed the installation instructions.
>>>
>>> Item 4, after enabling TECH MD, is Tap DISP and rotate VFO B to display SYN1 and SYN2. I do not see these items. Any idea how to debug this?
>>>
>>> 73
>>>
>>> Gareth, M5KVK
>>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

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engineercm

Re: Problems with KRX3A

Gareth,

I had a similar problem when my K3 returned from the factory after a few
updates. In my case, I had to press and HOLD the RX ANT button. Don't
remember where I read this but it worked. Toggling this switch changes the
Sub Rcvr between the main antenna and the receive antenna as the signal
source.

The K3 is a remarkable flexible radio. With that flexibility comes
complexity at times that is hard to fathom--at least for me.

On Wed, May 27, 2020 at 9:50 AM Gareth M5KVK <[hidden email]> wrote:

> Great minds, Grant. That's my next step.
>
> As I said in the OP, this was a rig bought secondhand.
>
> Gareth M5KVK
>
> On 27/05/2020, 14:35, "Grant Youngman" <[hidden email]> wrote:
>
> Have you checked the installation of the receiver module? Meaning
> that the two small riser modules that it plugs into are properly seated to
> the main RF board and the KRX3. I had a dead sub-receiver problem once. I
> had been in the radio at some point to install an update. When
> reinstalling the KRX3, I had pinched one of the coax cables that’s in the
> vicinity of the riser nearest the front of the radio and pulled the cable
> out of it’s socket when reinserting the KRX3, far enough not to work, but
> not so far that I noticed it until the next time I tried using the sub.
>
> Just one more idea of something to look at.
>
> Grant NQ5T
>
> > On May 27, 2020, at 9:21 AM, Gareth M5KVK <[hidden email]>
> wrote:
> >
> > I tried that, Richard.
> > ANT definitely says MAIN but still no signal.
> >
> > Gareth
> >
> > On 26/05/2020, 18:40, "Richard Thorne" <[hidden email]> wrote:
> >
> > Gareth,
> >
> > Try this.
> >
> > - Turn on the sub receiver by pushing sub
> > - Push and hold B Set so the display shows b set
> > - Be sure the ant shows Main and not AUX. If it shows AUX push
> the ANT
> > button to toggle between the two.
> >
> > May not be the problem but I've found for some reason my sub
> receiver is
> > on the Aux antenna. My rig doesn't have the ant tuner either.
> >
> > Rich - N5ZC
> >
> > On 5/26/2020 11:21 AM, Gareth M5KVK wrote:
> >> Thanks, Richard
> >> There is no ATU, so there is only the one ANT to select. However, I
> have checked that CONFIG KRX3 has Ant=ATu (even though there is no ATU,
> only this or BNC are offered as options)
> >>
> >> Gareth
> >>
> >> On 26/05/2020, 16:31, "Richard Thorne" <[hidden email]>
> wrote:
> >>
> >> Gareth,
> >>
> >> You probably don't have the correct antenna port assigned to
> the sub
> >> receiver. I'm not in front of my rig, but I believe you need
> to push
> >> and hold A/B (B Set) to get to the sub receiver, at that point
> be sure
> >> the correct antenna port is selected.
> >>
> >> Rich - N5ZC
> >>
> >> On 5/26/2020 10:05 AM, Gareth M5KVK wrote:
> >>> Hi there
> >>> I bought a s/h K3S a couple of years ago (SN 10901). It has a
> KRX3A installed, but I’ve never tried to use it until now. When I enabled
> the sub receiver this morning, I found I was getting no signal.
> >>>
> >>> I’ve checked various CONFIG settings and it’s set to use the MAIN
> ANT and it’s AF is independent of the K3S. In an attempt to make progress,
> I reviewed the installation instructions.
> >>>
> >>> Item 4, after enabling TECH MD, is Tap DISP and rotate VFO B to
> display SYN1 and SYN2. I do not see these items. Any idea how to debug this?
> >>>
> >>> 73
> >>>
> >>> Gareth, M5KVK
> >>
> > ______________________________________________________________
> > Elecraft mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/elecraft
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:[hidden email]
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> > Message delivered to [hidden email]
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

--
73,

Clark, WU4B
Little Pistol With Wires
QRPARCI #10815
SKCC #3892
NAQCC #5055
CWOPS #1869
Collins Collectors #AC90-12432
Southeastern DX Club <http://www.sedxc.org>
North Georgia QRP Club <http://www.nogaqrp.org>

*"It is vain to do with more what can be done with less."*
*Attributed to *William of Occam (1288 AD - 1348 AD)
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m5kvk

Re: Problems with KRX3A

Thanks, Clark
Switching the SUB between main and Aux makes no difference: there is no AF other than noise and nothing on the S meter when B SET is pressed.

Gareth

From: Clark Macaulay <[hidden email]>
Date: Wednesday, 27 May 2020 at 16:49
To: Gareth M5KVK <[hidden email]>
Cc: Grant Youngman <[hidden email]>, "[hidden email]" <[hidden email]>
Subject: Re: [Elecraft] Problems with KRX3A

Gareth,

I had a similar problem when my K3 returned from the factory after a few updates. In my case, I had to press and HOLD the RX ANT button. Don't remember where I read this but it worked. Toggling this switch changes the Sub Rcvr between the main antenna and the receive antenna as the signal source.

The K3 is a remarkable flexible radio. With that flexibility comes complexity at times that is hard to fathom--at least for me.

On Wed, May 27, 2020 at 9:50 AM Gareth M5KVK <[hidden email]<mailto:[hidden email]>> wrote:
Great minds, Grant. That's my next step.

As I said in the OP, this was a rig bought secondhand.

Gareth M5KVK

On 27/05/2020, 14:35, "Grant Youngman" <[hidden email]<mailto:[hidden email]>> wrote:

Have you checked the installation of the receiver module? Meaning that the two small riser modules that it plugs into are properly seated to the main RF board and the KRX3. I had a dead sub-receiver problem once. I had been in the radio at some point to install an update. When reinstalling the KRX3, I had pinched one of the coax cables that’s in the vicinity of the riser nearest the front of the radio and pulled the cable out of it’s socket when reinserting the KRX3, far enough not to work, but not so far that I noticed it until the next time I tried using the sub.

Just one more idea of something to look at.

Grant NQ5T

> On May 27, 2020, at 9:21 AM, Gareth M5KVK <[hidden email]<mailto:[hidden email]>> wrote:
>
> I tried that, Richard.
> ANT definitely says MAIN but still no signal.
>
> Gareth
>
> On 26/05/2020, 18:40, "Richard Thorne" <[hidden email]<mailto:[hidden email]>> wrote:
>
> Gareth,
>
> Try this.
>
> - Turn on the sub receiver by pushing sub
> - Push and hold B Set so the display shows b set
> - Be sure the ant shows Main and not AUX. If it shows AUX push the ANT
> button to toggle between the two.
>
> May not be the problem but I've found for some reason my sub receiver is
> on the Aux antenna. My rig doesn't have the ant tuner either.
>
> Rich - N5ZC
>
> On 5/26/2020 11:21 AM, Gareth M5KVK wrote:
>> Thanks, Richard
>> There is no ATU, so there is only the one ANT to select. However, I have checked that CONFIG KRX3 has Ant=ATu (even though there is no ATU, only this or BNC are offered as options)
>>
>> Gareth
>>
>> On 26/05/2020, 16:31, "Richard Thorne" <[hidden email]<mailto:[hidden email]>> wrote:
>>
>> Gareth,
>>
>> You probably don't have the correct antenna port assigned to the sub
>> receiver. I'm not in front of my rig, but I believe you need to push
>> and hold A/B (B Set) to get to the sub receiver, at that point be sure
>> the correct antenna port is selected.
>>
>> Rich - N5ZC
>>
>> On 5/26/2020 10:05 AM, Gareth M5KVK wrote:
>>> Hi there
>>> I bought a s/h K3S a couple of years ago (SN 10901). It has a KRX3A installed, but I’ve never tried to use it until now. When I enabled the sub receiver this morning, I found I was getting no signal.
>>>
>>> I’ve checked various CONFIG settings and it’s set to use the MAIN ANT and it’s AF is independent of the K3S. In an attempt to make progress, I reviewed the installation instructions.
>>>
>>> Item 4, after enabling TECH MD, is Tap DISP and rotate VFO B to display SYN1 and SYN2. I do not see these items. Any idea how to debug this?
>>>
>>> 73
>>>
>>> Gareth, M5KVK
>>
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--
73,

Clark, WU4B
Little Pistol With Wires
QRPARCI #10815
SKCC #3892
NAQCC #5055
CWOPS #1869
Collins Collectors #AC90-12432
Southeastern DX Club<http://www.sedxc.org>
North Georgia QRP Club<http://www.nogaqrp.org>

"It is vain to do with more what can be done with less."
Attributed to William of Occam (1288 AD - 1348 AD)

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m5kvk

Re: Problems with KRX3A

In reply to this post by m5kvk

I spent last evening checking the installation of the KRX3A. I did find one bit of incorrect plumbing (in the cables that connect the KRX3A to the rest of the K3S): however correcting it made no discernible difference.

The post-installation setup instructions pass OK and all the CONFIG menu options seem to be correct: though it is difficult to be sure.

With SUB on, SUB AF/RF at Max and Main AF at min: I get noise out of the speaker, but no signal: even though A and B are equal and the Main is definitely receiving a signal.
CONFIG
KRX3 Ant=bnc
L-MIX-R A B
SPKRS 1
SUB AF nor

Looks like an email to support is next.

Gareth, M5KVK

From: Gareth M5KVK <[hidden email]>
Date: Tuesday, 26 May 2020 at 16:05
To: "[hidden email]" <[hidden email]>
Subject: Problems with KRX3A

Hi there
I bought a s/h K3S a couple of years ago (SN 10901). It has a KRX3A installed, but I’ve never tried to use it until now. When I enabled the sub receiver this morning, I found I was getting no signal.

I’ve checked various CONFIG settings and it’s set to use the MAIN ANT and it’s AF is independent of the K3S. In an attempt to make progress, I reviewed the installation instructions.

Item 4, after enabling TECH MD, is Tap DISP and rotate VFO B to display SYN1 and SYN2. I do not see these items. Any idea how to debug this?

73

Gareth, M5KVK
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Nr4c

Re: Problems with KRX3A

Sorry!

KRX3 Ant=bnc does not agree with both on MAIN.

Sent from my iPhone
...nr4c. bill

> On May 28, 2020, at 8:54 AM, Gareth M5KVK <[hidden email]> wrote:
>
> I spent last evening checking the installation of the KRX3A. I did find one bit of incorrect plumbing (in the cables that connect the KRX3A to the rest of the K3S): however correcting it made no discernible difference.
>
> The post-installation setup instructions pass OK and all the CONFIG menu options seem to be correct: though it is difficult to be sure.
>
> With SUB on, SUB AF/RF at Max and Main AF at min: I get noise out of the speaker, but no signal: even though A and B are equal and the Main is definitely receiving a signal.
> CONFIG
> KRX3 Ant=bnc
> L-MIX-R A B
> SPKRS 1
> SUB AF nor
>
> Looks like an email to support is next.
>
> Gareth, M5KVK
>
> From: Gareth M5KVK <[hidden email]>
> Date: Tuesday, 26 May 2020 at 16:05
> To: "[hidden email]" <[hidden email]>
> Subject: Problems with KRX3A
>
> Hi there
> I bought a s/h K3S a couple of years ago (SN 10901). It has a KRX3A installed, but I’ve never tried to use it until now. When I enabled the sub receiver this morning, I found I was getting no signal.
>
> I’ve checked various CONFIG settings and it’s set to use the MAIN ANT and it’s AF is independent of the K3S. In an attempt to make progress, I reviewed the installation instructions.
>
> Item 4, after enabling TECH MD, is Tap DISP and rotate VFO B to display SYN1 and SYN2. I do not see these items. Any idea how to debug this?
>
> 73
>
> Gareth, M5KVK
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]

m5kvk

Re: Problems with KRX3A

Hi Bill
The documentation around this is a bit confusing, but my understanding is that this setting defines where the SUB gets its AUX antenna feed from. It can either be BNC (the Aux RF socket on the back panel), or (if you have the ATU installed and therefore two ANT sockets) it can get it from whichever ANT socket is not being used by MAIN. As I do not have ATU installed, the only option that works is bnc.

I can choose either MAIN or AUX ant for the SUB by pressing RX ANT

Does this make sense?

Gareth, M5KVK

On 28/05/2020, 14:03, "Nr4c" <[hidden email]> wrote:

Sorry!

KRX3 Ant=bnc does not agree with both on MAIN.

Sent from my iPhone
...nr4c. bill

> On May 28, 2020, at 8:54 AM, Gareth M5KVK <[hidden email]> wrote:
>
> I spent last evening checking the installation of the KRX3A. I did find one bit of incorrect plumbing (in the cables that connect the KRX3A to the rest of the K3S): however correcting it made no discernible difference.
>
> The post-installation setup instructions pass OK and all the CONFIG menu options seem to be correct: though it is difficult to be sure.
>
> With SUB on, SUB AF/RF at Max and Main AF at min: I get noise out of the speaker, but no signal: even though A and B are equal and the Main is definitely receiving a signal.
> CONFIG
> KRX3 Ant=bnc
> L-MIX-R A B
> SPKRS 1
> SUB AF nor
>
> Looks like an email to support is next.
>
> Gareth, M5KVK
>
> From: Gareth M5KVK <[hidden email]>
> Date: Tuesday, 26 May 2020 at 16:05
> To: "[hidden email]" <[hidden email]>
> Subject: Problems with KRX3A
>
> Hi there
> I bought a s/h K3S a couple of years ago (SN 10901). It has a KRX3A installed, but I’ve never tried to use it until now. When I enabled the sub receiver this morning, I found I was getting no signal.
>
> I’ve checked various CONFIG settings and it’s set to use the MAIN ANT and it’s AF is independent of the K3S. In an attempt to make progress, I reviewed the installation instructions.
>
> Item 4, after enabling TECH MD, is Tap DISP and rotate VFO B to display SYN1 and SYN2. I do not see these items. Any idea how to debug this?
>
> 73
>
> Gareth, M5KVK
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to [hidden email]
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w4sc-2

Re: Problems with KRX3A

In reply to this post by m5kvk

The config selection of ANT=BNC / ANT=MAIN does NOT actually select which is used for KRX3 alternate antenna input. When AUX input cable of the KRX3 is connected to the KAT3, the NON-TRANSMIT antenna used for the KRX3. Only one can be physically connected to be used by the KRX3. If no ATU, the only connection that is available would be to the installed BNC AUX connection. I believe this config selection may be inserting attenuation during transmit in the KRX3 signal path to provide protection.

For KRX3 AUX input I would always build / config to use the BNC connection. There are 2 points of failure in the ATU that would be catastrophic for the KRX3 if either of 2 relays fail.

Ben W4SC

Sent from Mail for Windows 10
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m5kvk

Re: Problems with KRX3A

In reply to this post by m5kvk

Thanks Mark
Sadly, Changing the CONFIG KRX3 to be ANT=ATU makes no difference.

Gareth

On 28/05/2020, 16:08, "Mark Musick" <[hidden email]> wrote:

HI Gareth,
Sorry, I sent my previous e-mail to you before seeing this one.
You have jogged my memory.
I still believe KRX3 ANT= ATU is correct, but what jogged my memory Gareth is I believe, and I'll have to check, is that if you have the ATU installed with the two antenna ports you can use the non-transmit port for a receive antenna. In other words if you have the ATU and have ANT1 selected as the transmit antenna you can select ANT2 for receive. It may be that setting is set to ANT2 when it should be ANT1. However, I believe the K3 is smart enough to know that ANT1 is the only one available when there is no ATU installed.

73,
Mark, WB9CIF

-----Original Message-----
From: [hidden email] <[hidden email]> On Behalf Of Gareth M5KVK
Sent: Thursday, May 28, 2020 14:53
To: Nr4c <[hidden email]>
Cc: [hidden email]
Subject: Re: [Elecraft] Problems with KRX3A

Hi Bill
The documentation around this is a bit confusing, but my understanding is that this setting defines where the SUB gets its AUX antenna feed from. It can either be BNC (the Aux RF socket on the back panel), or (if you have the ATU installed and therefore two ANT sockets) it can get it from whichever ANT socket is not being used by MAIN. As I do not have ATU installed, the only option that works is bnc.

I can choose either MAIN or AUX ant for the SUB by pressing RX ANT

Does this make sense?

Gareth, M5KVK

On 28/05/2020, 14:03, "Nr4c" <[hidden email]> wrote:

Sorry!

KRX3 Ant=bnc does not agree with both on MAIN.

Sent from my iPhone
...nr4c. bill

> On May 28, 2020, at 8:54 AM, Gareth M5KVK <[hidden email]> wrote:
>
> I spent last evening checking the installation of the KRX3A. I did find one bit of incorrect plumbing (in the cables that connect the KRX3A to the rest of the K3S): however correcting it made no discernible difference.
>
> The post-installation setup instructions pass OK and all the CONFIG menu options seem to be correct: though it is difficult to be sure.
>
> With SUB on, SUB AF/RF at Max and Main AF at min: I get noise out of the speaker, but no signal: even though A and B are equal and the Main is definitely receiving a signal.
> CONFIG
> KRX3 Ant=bnc
> L-MIX-R A B
> SPKRS 1
> SUB AF nor
>
> Looks like an email to support is next.
>
> Gareth, M5KVK
>
> From: Gareth M5KVK <[hidden email]>
> Date: Tuesday, 26 May 2020 at 16:05
> To: "[hidden email]" <[hidden email]>
> Subject: Problems with KRX3A
>
> Hi there
> I bought a s/h K3S a couple of years ago (SN 10901). It has a KRX3A installed, but I’ve never tried to use it until now. When I enabled the sub receiver this morning, I found I was getting no signal.
>
> I’ve checked various CONFIG settings and it’s set to use the MAIN ANT and it’s AF is independent of the K3S. In an attempt to make progress, I reviewed the installation instructions.
>
> Item 4, after enabling TECH MD, is Tap DISP and rotate VFO B to display SYN1 and SYN2. I do not see these items. Any idea how to debug this?
>
> 73
>
> Gareth, M5KVK
> ______________________________________________________________
> Elecraft mailing list
> Home: https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmailman%2Flistinfo%2Felecraft&data=02%7C01%7C%7Cd6e946f34a374010f11e08d803171b5e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637262745056307492&sdata=Uo54AiGfy1m5ISLWyMpnApNSzZBOYfX25kdNs0mztTI%3D&reserved=0
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engineercm

Re: Problems with KRX3A

Hi, Gareth.

Well...you certainly have a mystery here. I found the documentation in the
Elecraft manual on this subject a little hard to follow; the book by Fred
Cady on the K3 is better and, if you'd don't have have it, I highly
recommend it.

I think you said on a previous post that you can hear the noise of the SUB
when enabling it, then you are correct that there is something blocking the
signal from the antenna. Assuming the configuration is correct, it might
be the cable inside the K3 that feeds the signal to the SUB. When I opened
up my K3 a while back to add a filter to the SUB. I noticed that one of the
little coax cables entered the SUB at a pinched right angle (at least it
was in mine). While I didn't have a problem, it seemed like it could be a
problem if I didn't make sure the little connector was firmly inserted.

I'm afraid I'm now beyond my pay grade on this...

On Thu, May 28, 2020 at 11:36 AM Gareth M5KVK <[hidden email]>
wrote:

> Thanks Mark
> Sadly, Changing the CONFIG KRX3 to be ANT=ATU makes no difference.
>
> Gareth
>
> On 28/05/2020, 16:08, "Mark Musick" <[hidden email]> wrote:
>
> HI Gareth,
> Sorry, I sent my previous e-mail to you before seeing this one.
> You have jogged my memory.
> I still believe KRX3 ANT= ATU is correct, but what jogged my memory
> Gareth is I believe, and I'll have to check, is that if you have the ATU
> installed with the two antenna ports you can use the non-transmit port for
> a receive antenna. In other words if you have the ATU and have ANT1
> selected as the transmit antenna you can select ANT2 for receive. It may be
> that setting is set to ANT2 when it should be ANT1. However, I believe the
> K3 is smart enough to know that ANT1 is the only one available when there
> is no ATU installed.
>
> 73,
> Mark, WB9CIF
>
> -----Original Message-----
> From: [hidden email] <
> [hidden email]> On Behalf Of Gareth M5KVK
> Sent: Thursday, May 28, 2020 14:53
> To: Nr4c <[hidden email]>
> Cc: [hidden email]
> Subject: Re: [Elecraft] Problems with KRX3A
>
> Hi Bill
> The documentation around this is a bit confusing, but my understanding
> is that this setting defines where the SUB gets its AUX antenna feed from.
> It can either be BNC (the Aux RF socket on the back panel), or (if you have
> the ATU installed and therefore two ANT sockets) it can get it from
> whichever ANT socket is not being used by MAIN. As I do not have ATU
> installed, the only option that works is bnc.
>
> I can choose either MAIN or AUX ant for the SUB by pressing RX ANT
>
> Does this make sense?
>
> Gareth, M5KVK
>
> On 28/05/2020, 14:03, "Nr4c" <[hidden email]> wrote:
>
> Sorry!
>
> KRX3 Ant=bnc does not agree with both on MAIN.
>
> Sent from my iPhone
> ...nr4c. bill
>
>
> > On May 28, 2020, at 8:54 AM, Gareth M5KVK <
> [hidden email]> wrote:
> >
> > I spent last evening checking the installation of the KRX3A. I
> did find one bit of incorrect plumbing (in the cables that connect the
> KRX3A to the rest of the K3S): however correcting it made no discernible
> difference.
> >
> > The post-installation setup instructions pass OK and all the
> CONFIG menu options seem to be correct: though it is difficult to be sure.
> >
> > With SUB on, SUB AF/RF at Max and Main AF at min: I get noise
> out of the speaker, but no signal: even though A and B are equal and the
> Main is definitely receiving a signal.
> > CONFIG
> > KRX3 Ant=bnc
> > L-MIX-R A B
> > SPKRS 1
> > SUB AF nor
> >
> > Looks like an email to support is next.
> >
> > Gareth, M5KVK
> >
> > From: Gareth M5KVK <[hidden email]>
> > Date: Tuesday, 26 May 2020 at 16:05
> > To: "[hidden email]" <[hidden email]>
> > Subject: Problems with KRX3A
> >
> > Hi there
> > I bought a s/h K3S a couple of years ago (SN 10901). It has a
> KRX3A installed, but I’ve never tried to use it until now. When I enabled
> the sub receiver this morning, I found I was getting no signal.
> >
> > I’ve checked various CONFIG settings and it’s set to use the
> MAIN ANT and it’s AF is independent of the K3S. In an attempt to make
> progress, I reviewed the installation instructions.
> >
> > Item 4, after enabling TECH MD, is Tap DISP and rotate VFO B to
> display SYN1 and SYN2. I do not see these items. Any idea how to debug this?
> >
> > 73
> >
> > Gareth, M5KVK
> > ______________________________________________________________
> > Elecraft mailing list
> > Home:
> https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmailman%2Flistinfo%2Felecraft&data=02%7C01%7C%7Cd6e946f34a374010f11e08d803171b5e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637262745056307492&sdata=Uo54AiGfy1m5ISLWyMpnApNSzZBOYfX25kdNs0mztTI%3D&reserved=0
> > Help:
> https://nam01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmailman.qth.net%2Fmmfaq.htm&data=02%7C01%7C%7Cd6e946f34a374010f11e08d803171b5e%7C84df9e7fe9f640afb435aaaaaaaaaaaa%7C1%7C0%7C637262745056307492&sdata=F74Vsiv1DxRfd9JHksPBhSXL17%2F4s0egq3SUy%2BetNlY%3D&reserved=0
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m5kvk

Re: Problems with KRX3A

Thanks, Clark
I think I’m going to open her up again and test all the connecting cables.

Never mind, at least I get to use my K2 for a change 😊

Gareth, M5KVK

From: Clark Macaulay <[hidden email]>
Date: Thursday, 28 May 2020 at 16:47
To: Gareth M5KVK <[hidden email]>
Cc: Mark Musick <[hidden email]>, "[hidden email]" <[hidden email]>
Subject: Re: [Elecraft] Problems with KRX3A

Hi, Gareth.

Well...you certainly have a mystery here. I found the documentation in the Elecraft manual on this subject a little hard to follow; the book by Fred Cady on the K3 is better and, if you'd don't have have it, I highly recommend it.

I think you said on a previous post that you can hear the noise of the SUB when enabling it, then you are correct that there is something blocking the signal from the antenna. Assuming the configuration is correct, it might be the cable inside the K3 that feeds the signal to the SUB. When I opened up my K3 a while back to add a filter to the SUB. I noticed that one of the little coax cables entered the SUB at a pinched right angle (at least it was in mine). While I didn't have a problem, it seemed like it could be a problem if I didn't make sure the little connector was firmly inserted.

I'm afraid I'm now beyond my pay grade on this...

On Thu, May 28, 2020 at 11:36 AM Gareth M5KVK <[hidden email]<mailto:[hidden email]>> wrote:
Thanks Mark
Sadly, Changing the CONFIG KRX3 to be ANT=ATU makes no difference.

Gareth

On 28/05/2020, 16:08, "Mark Musick" <[hidden email]<mailto:[hidden email]>> wrote:

HI Gareth,
Sorry, I sent my previous e-mail to you before seeing this one.
You have jogged my memory.
I still believe KRX3 ANT= ATU is correct, but what jogged my memory Gareth is I believe, and I'll have to check, is that if you have the ATU installed with the two antenna ports you can use the non-transmit port for a receive antenna. In other words if you have the ATU and have ANT1 selected as the transmit antenna you can select ANT2 for receive. It may be that setting is set to ANT2 when it should be ANT1. However, I believe the K3 is smart enough to know that ANT1 is the only one available when there is no ATU installed.

73,
Mark, WB9CIF

-----Original Message-----
From: [hidden email]<mailto:[hidden email]> <[hidden email]<mailto:[hidden email]>> On Behalf Of Gareth M5KVK
Sent: Thursday, May 28, 2020 14:53
To: Nr4c <[hidden email]<mailto:[hidden email]>>
Cc: [hidden email]<mailto:[hidden email]>
Subject: Re: [Elecraft] Problems with KRX3A

Hi Bill
The documentation around this is a bit confusing, but my understanding is that this setting defines where the SUB gets its AUX antenna feed from. It can either be BNC (the Aux RF socket on the back panel), or (if you have the ATU installed and therefore two ANT sockets) it can get it from whichever ANT socket is not being used by MAIN. As I do not have ATU installed, the only option that works is bnc.

I can choose either MAIN or AUX ant for the SUB by pressing RX ANT

Does this make sense?

Gareth, M5KVK

On 28/05/2020, 14:03, "Nr4c" <[hidden email]<mailto:[hidden email]>> wrote:

Sorry!

KRX3 Ant=bnc does not agree with both on MAIN.

Sent from my iPhone
...nr4c. bill

> On May 28, 2020, at 8:54 AM, Gareth M5KVK <[hidden email]<mailto:[hidden email]>> wrote:
>
> I spent last evening checking the installation of the KRX3A. I did find one bit of incorrect plumbing (in the cables that connect the KRX3A to the rest of the K3S): however correcting it made no discernible difference.
>
> The post-installation setup instructions pass OK and all the CONFIG menu options seem to be correct: though it is difficult to be sure.
>
> With SUB on, SUB AF/RF at Max and Main AF at min: I get noise out of the speaker, but no signal: even though A and B are equal and the Main is definitely receiving a signal.
> CONFIG
> KRX3 Ant=bnc
> L-MIX-R A B
> SPKRS 1
> SUB AF nor
>
> Looks like an email to support is next.
>
> Gareth, M5KVK
>
> From: Gareth M5KVK <[hidden email]<mailto:[hidden email]>>
> Date: Tuesday, 26 May 2020 at 16:05
> To: "[hidden email]<mailto:[hidden email]>" <[hidden email]<mailto:[hidden email]>>
> Subject: Problems with KRX3A
>
> Hi there
> I bought a s/h K3S a couple of years ago (SN 10901). It has a KRX3A installed, but I’ve never tried to use it until now. When I enabled the sub receiver this morning, I found I was getting no signal.
>
> I’ve checked various CONFIG settings and it’s set to use the MAIN ANT and it’s AF is independent of the K3S. In an attempt to make progress, I reviewed the installation instructions.
>
> Item 4, after enabling TECH MD, is Tap DISP and rotate VFO B to display SYN1 and SYN2. I do not see these items. Any idea how to debug this?
>
> 73
>
> Gareth, M5KVK
> ______________________________________________________________
> Elecraft mailing list
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--
73,

Clark, WU4B
Little Pistol With Wires
QRPARCI #10815
SKCC #3892
NAQCC #5055
CWOPS #1869
Collins Collectors #AC90-12432
Southeastern DX Club<http://www.sedxc.org>
North Georgia QRP Club<http://www.nogaqrp.org>

"It is vain to do with more what can be done with less."
Attributed to William of Occam (1288 AD - 1348 AD)

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Nr4c

Re: Problems with KRX3A

In reply to this post by m5kvk

Only had a K3 w/out the KAT3, I’m not sure. But if Sub ant is bnc the you need to connect its ant to the bnc Aux port I think.

Sent from my iPhone
...nr4c. bill

> On May 28, 2020, at 10:52 AM, Gareth M5KVK <[hidden email]> wrote:
>
> Hi Bill
> The documentation around this is a bit confusing, but my understanding is that this setting defines where the SUB gets its AUX antenna feed from. It can either be BNC (the Aux RF socket on the back panel), or (if you have the ATU installed and therefore two ANT sockets) it can get it from whichever ANT socket is not being used by MAIN. As I do not have ATU installed, the only option that works is bnc.
>
> I can choose either MAIN or AUX ant for the SUB by pressing RX ANT
>
> Does this make sense?
>
> Gareth, M5KVK
>
> On 28/05/2020, 14:03, "Nr4c" <[hidden email]> wrote:
>
> Sorry!
>
> KRX3 Ant=bnc does not agree with both on MAIN.
>
> Sent from my iPhone
> ...nr4c. bill
>
>
>> On May 28, 2020, at 8:54 AM, Gareth M5KVK <[hidden email]> wrote:
>>
>> I spent last evening checking the installation of the KRX3A. I did find one bit of incorrect plumbing (in the cables that connect the KRX3A to the rest of the K3S): however correcting it made no discernible difference.
>>
>> The post-installation setup instructions pass OK and all the CONFIG menu options seem to be correct: though it is difficult to be sure.
>>
>> With SUB on, SUB AF/RF at Max and Main AF at min: I get noise out of the speaker, but no signal: even though A and B are equal and the Main is definitely receiving a signal.
>> CONFIG
>> KRX3 Ant=bnc
>> L-MIX-R A B
>> SPKRS 1
>> SUB AF nor
>>
>> Looks like an email to support is next.
>>
>> Gareth, M5KVK
>>
>> From: Gareth M5KVK <[hidden email]>
>> Date: Tuesday, 26 May 2020 at 16:05
>> To: "[hidden email]" <[hidden email]>
>> Subject: Problems with KRX3A
>>
>> Hi there
>> I bought a s/h K3S a couple of years ago (SN 10901). It has a KRX3A installed, but I’ve never tried to use it until now. When I enabled the sub receiver this morning, I found I was getting no signal.
>>
>> I’ve checked various CONFIG settings and it’s set to use the MAIN ANT and it’s AF is independent of the K3S. In an attempt to make progress, I reviewed the installation instructions.
>>
>> Item 4, after enabling TECH MD, is Tap DISP and rotate VFO B to display SYN1 and SYN2. I do not see these items. Any idea how to debug this?
>>
>> 73
>>
>> Gareth, M5KVK
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> Message delivered to [hidden email]

w4sc-2

Re: Problems with KRX3A

In reply to this post by m5kvk

Ref pp 43 of KRX3 Istallation and User Guide Rev F Dec 22 2010

ALWAYS Set ANT = BNC if not connected to KAT3.

Clarification: I believe config selection ANT=ATU may be inserting attenuation during transmit in the KRX3 signal path to provide protection.

Make sure KSYN3 tmp connections good. I had the KRX3 “dead” issue on friends K3.

Ben W4SC

Sent from Mail for Windows 10

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Nr4c

Re: Problems with KRX3A

In reply to this post by m5kvk

I think this only works if there is an ATU.

Sent from my iPhone
...nr4c. bill

> On May 28, 2020, at 11:37 AM, Gareth M5KVK <[hidden email]> wrote:
>
> Thanks Mark
> Sadly, Changing the CONFIG KRX3 to be ANT=ATU makes no difference.
>
> Gareth
>
> On 28/05/2020, 16:08, "Mark Musick" <[hidden email]> wrote:
>
> HI Gareth,
> Sorry, I sent my previous e-mail to you before seeing this one.
> You have jogged my memory.
> I still believe KRX3 ANT= ATU is correct, but what jogged my memory Gareth is I believe, and I'll have to check, is that if you have the ATU installed with the two antenna ports you can use the non-transmit port for a receive antenna. In other words if you have the ATU and have ANT1 selected as the transmit antenna you can select ANT2 for receive. It may be that setting is set to ANT2 when it should be ANT1. However, I believe the K3 is smart enough to know that ANT1 is the only one available when there is no ATU installed.
>
> 73,
> Mark, WB9CIF
>
> -----Original Message-----
> From: [hidden email] <[hidden email]> On Behalf Of Gareth M5KVK
> Sent: Thursday, May 28, 2020 14:53
> To: Nr4c <[hidden email]>
> Cc: [hidden email]
> Subject: Re: [Elecraft] Problems with KRX3A
>
> Hi Bill
> The documentation around this is a bit confusing, but my understanding is that this setting defines where the SUB gets its AUX antenna feed from. It can either be BNC (the Aux RF socket on the back panel), or (if you have the ATU installed and therefore two ANT sockets) it can get it from whichever ANT socket is not being used by MAIN. As I do not have ATU installed, the only option that works is bnc.
>
> I can choose either MAIN or AUX ant for the SUB by pressing RX ANT
>
> Does this make sense?
>
> Gareth, M5KVK
>
> On 28/05/2020, 14:03, "Nr4c" <[hidden email]> wrote:
>
> Sorry!
>
> KRX3 Ant=bnc does not agree with both on MAIN.
>
> Sent from my iPhone
> ...nr4c. bill
>
>
>> On May 28, 2020, at 8:54 AM, Gareth M5KVK <[hidden email]> wrote:
>>
>> I spent last evening checking the installation of the KRX3A. I did find one bit of incorrect plumbing (in the cables that connect the KRX3A to the rest of the K3S): however correcting it made no discernible difference.
>>
>> The post-installation setup in