[Elecraft] TX Monitor Directional Couplers?

[hawley, charles j jr]

Whoops! I meant 470 pF capacitors. 

Chuck Hawley
 c-hawley at illinois.edu

 Amateur Radio, KE9UW
 aka Jack, BMW Motorcycles
________________________________________
From: elecraft-bounces at mailman.qth.net [elecraft-bounces at mailman.qth.net] on behalf of hawley, charles j jr [c-hawley at illinois.edu]
Sent: Tuesday, March 20, 2018 4:36 PM
To: Alan; elecraft at mailman.qth.net
Subject: Re: [Elecraft] TX Monitor Directional Couplers?

I found the mod. Replace C5, 6, and 7 which were .01 uF with 470 uF SMD capacitors.
Thanks for the replies,

Chuck Hawley
 c-hawley at illinois.edu

 Amateur Radio, KE9UW
 aka Jack, BMW Motorcycles
________________________________________
From: elecraft-bounces at mailman.qth.net [elecraft-bounces at mailman.qth.net] on behalf of Alan [n1al at sonic.net]
Sent: Tuesday, March 20, 2018 10:57 AM
To: elecraft at mailman.qth.net
Subject: Re: [Elecraft] TX Monitor Directional Couplers?

If you have an older coupler it will work fine for SWR and power
measurements with the P3TXMON but the modulation waveform display will
not show full bandwidth.

Alan N1AL


On 03/20/2018 07:33 AM, Don Wilhelm wrote:
> Chuck,
>
> The later W2 couplers are the same as those for the P3TXMON, but the
> ones for a time after the P3TXMON was introduced are different.
>
> The early ones will not work well with the P3TXMON.
>
> Sorry, but I cannot tell you when the changeover took place.
> You will have to dig up that modification information and examine your
> coupler to see if has the changes installed.
>
> 73,
> Don W3FPR
>
> On 3/20/2018 10:05 AM, hawley, charles j jr wrote:
>> Are the directional couplers, the DCHF-xxxx, the same as the ones on
>> the W2 wattmeter? I seem to remember something about modifying an
>> existing directional coupler in the early days of the P3TXMON.
>> If they are exactly the same do all the directional couplers ever
>> sold, early ones and now later ones, work with the P3TXMON?

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