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K3 xmit problem

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Mike Reublin

K3 xmit problem

K3/100 #3539 with KAT3, KXV3, KTCX01-1, 2.8, 400, 250 filters. MCU 3.57,
FPF 1.06, DSP1 2.45.

Transmitting into a dummy load, with nothing else in line, Antenna 1
shows an SWR of 7.1-1 on 20 meters. On 10 meters, SWR is 1.1-1 and I
have a HI CUR flag.
On all the other bands SWR is OK.

SWR on antenna 2 is OK on all bands.

What should I be looking at to fix this?

Thanks, Mike NF4L

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John Lonigro

Re: K3 xmit problem

Mike:
This is a shot in the dark (I don't even own a K3). Did you tune the
rig when you installed the dummy load? If it is like the K2 (and I
think it is in this regard), the antenna tuner stays at the settings it
last made for whatever load was placed on the antenna input. Putting a
dummy load on it doesn't guarantee the SWR is 1:1. You need to tune the
rig for the dummy load. Then it should be close to 1:1 if all is
working properly.

The fact that it seems to work fine with antenna 2 aroused my suspicion
that this is the only problem you are facing.

73's and good luck,
John AA0VE

Mike wrote:

> K3/100 #3539 with KAT3, KXV3, KTCX01-1, 2.8, 400, 250 filters. MCU 3.57,
> FPF 1.06, DSP1 2.45.
>
> Transmitting into a dummy load, with nothing else in line, Antenna 1
> shows an SWR of 7.1-1 on 20 meters. On 10 meters, SWR is 1.1-1 and I
> have a HI CUR flag.
> On all the other bands SWR is OK.
>
> SWR on antenna 2 is OK on all bands.
>
> What should I be looking at to fix this?
>
> Thanks, Mike NF4L
>
>

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Mike Reublin

Re: K3 xmit problem

Hi John -

I actually had the tuner off. I re-enabled it, tuned, and turned it back
off, and bada-bing, bada-bang! Looks OK now.
I don't understand why that worked, but I'm happy it did.

Thanks for the tip!

John R. Lonigro wrote:

> Mike:
> This is a shot in the dark (I don't even own a K3). Did you tune the
> rig when you installed the dummy load? If it is like the K2 (and I
> think it is in this regard), the antenna tuner stays at the settings it
> last made for whatever load was placed on the antenna input. Putting a
> dummy load on it doesn't guarantee the SWR is 1:1. You need to tune the
> rig for the dummy load. Then it should be close to 1:1 if all is
> working properly.
>
> The fact that it seems to work fine with antenna 2 aroused my suspicion
> that this is the only problem you are facing.
>
> 73's and good luck,
> John AA0VE
>
> Mike wrote:
>
>> K3/100 #3539 with KAT3, KXV3, KTCX01-1, 2.8, 400, 250 filters. MCU 3.57,
>> FPF 1.06, DSP1 2.45.
>>
>> Transmitting into a dummy load, with nothing else in line, Antenna 1
>> shows an SWR of 7.1-1 on 20 meters. On 10 meters, SWR is 1.1-1 and I
>> have a HI CUR flag.
>> On all the other bands SWR is OK.
>>
>> SWR on antenna 2 is OK on all bands.
>>
>> What should I be looking at to fix this?
>>
>> Thanks, Mike NF4L
>>
>>
>>
> ______________________________________________________________
> 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
>
>

Mike Reublin

Re: K3 xmit problem

You have one of those too?

[hidden email] wrote:

> Your welcome..
>
> Oh oh, the nice man in the white coat wants me to follow him...(:-))
>
> Gary
> Sent via BlackBerry® from Telstra
>
> -----Original Message-----
> From: Mike <[hidden email]>
> Date: Sat, 21 Nov 2009 19:59:12
> To: <[hidden email]>
> Subject: Re: [Elecraft] K3 xmit problem
>
> Thanks for the sanity check Gary.
>
> [hidden email] wrote:
>
>> Mike,
>>
>> I can duplicate your reported issue.
>>
>> I confirmed that re-enabling the KAT3 and pressing tune resets the ATU and then when you bypass the ATU the K3 sees the dummy load as 1:1.1
>>
>> Are the vagaries of our Hi-Tech radios of today.
>>
>> Glad it worked OK now.
>>
>> Gary
>> VK4WT/P
>> Sent via BlackBerry® from Telstra
>>
>> -----Original Message-----
>> From: Mike <[hidden email]>
>> Date: Sat, 21 Nov 2009 19:50:16
>> To: <[hidden email]>
>> Cc: [hidden email]<[hidden email]>
>> Subject: Re: [Elecraft] K3 xmit problem
>>
>> Hi John -
>>
>> I actually had the tuner off. I re-enabled it, tuned, and turned it back
>> off, and bada-bing, bada-bang! Looks OK now.
>> I don't understand why that worked, but I'm happy it did.
>>
>> Thanks for the tip!
>>
>> John R. Lonigro wrote:
>>
>>
>>> Mike:
>>> This is a shot in the dark (I don't even own a K3). Did you tune the
>>> rig when you installed the dummy load? If it is like the K2 (and I
>>> think it is in this regard), the antenna tuner stays at the settings it
>>> last made for whatever load was placed on the antenna input. Putting a
>>> dummy load on it doesn't guarantee the SWR is 1:1. You need to tune the
>>> rig for the dummy load. Then it should be close to 1:1 if all is
>>> working properly.
>>>
>>> The fact that it seems to work fine with antenna 2 aroused my suspicion
>>> that this is the only problem you are facing.
>>>
>>> 73's and good luck,
>>> John AA0VE
>>>
>>> Mike wrote:
>>>
>>>
>>>
>>>> K3/100 #3539 with KAT3, KXV3, KTCX01-1, 2.8, 400, 250 filters. MCU 3.57,
>>>> FPF 1.06, DSP1 2.45.
>>>>
>>>> Transmitting into a dummy load, with nothing else in line, Antenna 1
>>>> shows an SWR of 7.1-1 on 20 meters. On 10 meters, SWR is 1.1-1 and I
>>>> have a HI CUR flag.
>>>> On all the other bands SWR is OK.
>>>>
>>>> SWR on antenna 2 is OK on all bands.
>>>>
>>>> What should I be looking at to fix this?
>>>>
>>>> Thanks, Mike NF4L
>>>>
>>>>
>>>>
>>>>
>>>>
>>> ______________________________________________________________
>>> 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
>>>
>>>
>>>
>>>
>> ______________________________________________________________
>> 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
>>
>>
>
>
>

Mike Reublin

Re: K3 xmit problem

In reply to this post by Mike Reublin

Thanks, Tom.

The ATU was in bypass. Turning it on, tuning into the DL, and then
putting it back into bypass cured it. As I said before, I don't
understand that behavior, but if it worked, I'll just accept it.

Tom Hammond wrote:

> Mike:
>
> Is ATU in BYPASS? If not, have you 'tuned' it into the D/L?
>
> 73,
>
> Tom N0SS
>
> At 18:20 11/21/2009, you wrote:
>> K3/100 #3539 with KAT3, KXV3, KTCX01-1, 2.8, 400, 250 filters. MCU 3.57,
>> FPF 1.06, DSP1 2.45.
>>
>> Transmitting into a dummy load, with nothing else in line, Antenna 1
>> shows an SWR of 7.1-1 on 20 meters. On 10 meters, SWR is 1.1-1 and I
>> have a HI CUR flag.
>> On all the other bands SWR is OK.
>>
>> SWR on antenna 2 is OK on all bands.
>>
>> What should I be looking at to fix this?
>>
>> Thanks, Mike NF4L
>>
>>
>> ______________________________________________________________
>> 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
>
>

Mike Reublin

Re: K3 xmit problem

I've got a note in to K3 support.

Tom Hammond wrote:

> Hi Mike:
>
>> The ATU was in bypass. Turning it on, tuning into the DL, and then
>> putting it back into bypass cured it. As I said before, I don't
>> understand that behavior, but if it worked, I'll just accept it.
>
> Yeah... I saw your (later-posted) noted immediately AFTER (figgers)
> I'd hit
> the <Send> button!!!
>
> That is a strange occurrence... and one I've not read of before. To
> me, the
> implication is that EITHER the ATU didn't fully switch you into BYPASS
> mode,
> OR that the SWR indication was screwed up in firmware.
>
> Glad you got it going though.
>
> GL OM,
>
> Tom
>
>