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[P3] P3TXMon Wattage/SWR

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MaverickNH

[P3] P3TXMon Wattage/SWR

K3S100/KAT100 rig with P3, P3SVGA and P3TXMON Directional Coupler 200W.

When TX at 100W, on 80m for example, the PEP on the P3 shows 2.4W PEP on the 120W scale and SWR is full scale at 99.0.

I have put a Bird43 at my antenna base and verified 64W just before the SG-235 remote ATU on my 43ft Vertical (it's far away on RG213). SWR on KAT100 Bypass is 1.2 by remote ATU and down to 1.0 with KAT100 enabled.

Must be I have things set up wrong on the TXMON?

Bret/N4SRN

Don Wilhelm

Re: [P3] P3TXMon Wattage/SWR

Bret,

The most common cause of a high SWR is 1) you do not have the right
antenna selected or 2) you have a bad (or loose) coax jumper or a coax
fault in the coax to your antenna.

What happens if you do not connect the TX Monitor coupler in the coax chain?

There is a remote possibility that you have a bad TX Monitor coupler,
but that would be rare.

Have you "trained" the tuner to the antenna before inserting the TX
Monitor coupler?

Note: the KAT100 is only for use with the K2 and it is an external
enclosure. If you are attempting to use the KAT100 with the K3S, it
will not work, you must use the internal KAT3 tuner.

With the remote tuner at the base of the antenna, you should be setting
the internal tuner to bypass.

73,
Don W3FPR

On 8/24/2017 6:07 AM, MaverickNH wrote:

> K3S100/KAT100 rig with P3, P3SVGA and P3TXMON Directional Coupler 200W.
>
> When TX at 100W, on 80m for example, the PEP on the P3 shows 2.4W PEP on the
> 120W scale and SWR is full scale at 99.0.
>
> I have put a Bird43 at my antenna base and verified 64W just before the
> SG-235 remote ATU on my 43ft Vertical (it's far away on RG213). SWR on
> KAT100 Bypass is 1.2 by remote ATU and down to 1.0 with KAT100 enabled.
>
> Must be I have things set up wrong on the TXMON?
>
> Bret/N4SRN
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/P3-P3TXMon-Wattage-SWR-tp7633727.html
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MaverickNH

Re: [P3] P3TXMon Wattage/SWR

Hi Don,

My mistake - yes, the internal ATU option for K3S is installed. I'll try as you suggested and report back. Thanks!

Bret/N4SRN

Alan Bloom

Re: [P3] P3TXMon Wattage/SWR

In reply to this post by MaverickNH

Any chance the sensor unit is hooked up backwards? (i.e. transmitter
connector to antenna and vice versa)

Alan N1AL

On 08/24/2017 03:07 AM, MaverickNH wrote:

MaverickNH

Re: [P3] P3TXMon Wattage/SWR

Possible - which side should LOAD be connected...K3S or Antenna?
Bret/N4SRN

Elecraft mailing list

Re: [P3] P3TXMon Wattage/SWR

The antenna connects to the "load" connector.

Harlan
K4HES

Sent from my iPhone

> On Aug 27, 2017, at 3:06 AM, MaverickNH <[hidden email]> wrote:
>
> Possible - which side should LOAD be connected...K3S or Antenna?
> Bret/N4SRN
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/P3-P3TXMon-Wattage-SWR-tp7633727p7633794.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> ______________________________________________________________
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MaverickNH

Re: [P3] P3TXMon Wattage/SWR

Yep - LOAD to Antenna. That's what I thought should be correct. So why I installed it backwards last August, I'll never know! I just reversed it.

Numbers look spot on now. *And* I see the UPS I'm using appears to limit output if I exceed the power draw specification. I just installed the software for that UPS and see nowhere in the documentation that it doesn't just limit to maximum wattage but sharply cuts wattage output if I hit the limit. So many of my FT8 TX cycles have been dropped from 100W to 20-25W by the UPS circuit when I exceed the limit.

I'll switch in another higher capacity UPS this week.

BRET/N4SRN

MaverickNH

Re: [P3] P3TXMon Wattage/SWR

In reply to this post by MaverickNH

And while I'm at it, is there a way to put a P3TXMON on both ANT1 and ANT2?

Bret/N4SRN

Don Wilhelm

Re: [P3] P3TXMon Wattage/SWR

Bret,

Yes, get a 2nd P3TXMON and get a switch to change the RJ-45 cable
between the two sensors. The switch will likely be a manual one.

73,
Don W3FPR

On 8/27/2017 8:34 AM, MaverickNH wrote:
> And while I'm at it, is there a way to put a P3TXMON on both ANT1 and ANT2?
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MaverickNH

Re: [P3] P3TXMon Wattage/SWR

I found a manual 4-way switch that should work nicely. Thanks Don.
Bret/N4SRN

Glenn Anderson

Re: [P3] P3TXMon Wattage/SWR

In reply to this post by MaverickNH

Is it the same sensor that is used with the W2 power meter? If so, can one sensor drive both devices?
Glenn WB5TUF
-------- Original message --------From: MaverickNH <[hidden email]> Date: 8/27/17 10:55 (GMT-06:00) To: [hidden email] Subject: Re: [Elecraft] [P3] P3TXMon Wattage/SWR
I found a manual 4-way switch that should work nicely. Thanks Don.
Bret/N4SRN

--
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Elecraft mailing list

Re: [P3] P3TXMon Wattage/SWR

In reply to this post by Elecraft mailing list

And if your a typical ham curiosity will have you opening the minibox to see
what makes it tick. Having done that the U box lid can be put on wrong so the
labeling is incorrect.

Learned that on my own....

73,
Bob
K2TK ex KN2TKR (1956) & K2TKR

On 8/27/2017 5:36 AM, Harlan Sherriff via Elecraft wrote:

> The antenna connects to the "load" connector.
>
> Harlan
> K4HES
>
> Sent from my iPhone
>
>> On Aug 27, 2017, at 3:06 AM, MaverickNH <[hidden email]> wrote:
>>
>> Possible - which side should LOAD be connected...K3S or Antenna?
>> Bret/N4SRN

Alan Bloom

Re: [P3] P3TXMon Wattage/SWR

In reply to this post by MaverickNH

The currently-shipping sensors are the same for the W2 and P3 TXMON. If
you have an older W2 sensor (I'm not sure of the S/N cutoff date), it
will work, but the bandwidth may be limited on the waveform display. It
can be modified by changing several capacitors. I don't see
modification instructions on the web site but I think Elecraft Support
should have the details.

One sensor cannot drive both devices. You would need a 8P8C (RJ-45)
mechanical switch for that. You could also use such a switch to select
one of several sensors for the P3. This is the one I bought, but there
are others:

https://smile.amazon.com/gp/product/B00AUB3SSA/ref=oh_aui_detailpage_o04_s00?ie=UTF8&psc=1

Alan N1AL

On 08/27/2017 09:16 AM, Glenn Anderson wrote:

> Is it the same sensor that is used with the W2 power meter? If so, can one sensor drive both devices?
> Glenn WB5TUF
> -------- Original message --------From: MaverickNH <[hidden email]> Date: 8/27/17 10:55 (GMT-06:00) To: [hidden email] Subject: Re: [Elecraft] [P3] P3TXMon Wattage/SWR
> I found a manual 4-way switch that should work nicely. Thanks Don.
> Bret/N4SRN
>
>
>
> --
> View this message in context: http://elecraft.365791.n2.nabble.com/P3-P3TXMon-Wattage-SWR-tp7633727p7633801.html
> Sent from the Elecraft mailing list archive at Nabble.com.
> ______________________________________________________________
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Nr4c

Re: [P3] P3TXMon Wattage/SWR

In reply to this post by Elecraft mailing list

I suggested to Elecraft as soon as I got mine, that the label should be on the other part of the case.

Sent from my iPhone
...nr4c. bill

> On Aug 27, 2017, at 12:21 PM, Bob via Elecraft <[hidden email]> wrote:
>
> And if your a typical ham curiosity will have you opening the minibox to see what makes it tick. Having done that the U box lid can be put on wrong so the labeling is incorrect.
>
> Learned that on my own....
>
> 73,
> Bob
> K2TK ex KN2TKR (1956) & K2TKR
>
>
>> On 8/27/2017 5:36 AM, Harlan Sherriff via Elecraft wrote:
>> The antenna connects to the "load" connector.
>> Harlan
>> K4HES
>> Sent from my iPhone
>>> On Aug 27, 2017, at 3:06 AM, MaverickNH <[hidden email]> wrote:
>>>
>>> Possible - which side should LOAD be connected...K3S or Antenna?
>>> Bret/N4SRN
>
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
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>
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Don Wilhelm

Re: [P3] P3TXMon Wattage/SWR

I suggest that you label the ends with extra labels close to the SO-239
jacks with "in" and "out" or something else meaningful to you before
opening the box.

A labeler does a nice job, but a Sharpie marker will be effective as well.

73,
Don W3FPR

On 8/27/2017 6:56 PM, Nr4c wrote:
> I suggested to Elecraft as soon as I got mine, that the label should be on the other part of the case.
>
> Sent from my iPhone
> ...nr4c. bill
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