TX Monitor Directional Couplers?
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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? Chuck Hawley [hidden email] Amateur Radio, KE9UW aka Jack, BMW Motorcycles ______________________________________________________________ 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]
Chuck, KE9UW
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Re: TX Monitor Directional Couplers?
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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? ______________________________________________________________ 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] |
Re: TX Monitor Directional Couplers?
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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? ______________________________________________________________ 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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I found the mod. Replace C5, 6, and 7 which were .01 uF with 470 uF SMD capacitors.
Thanks for the replies, Chuck Hawley [hidden email] Amateur Radio, KE9UW aka Jack, BMW Motorcycles ________________________________________ From: [hidden email] [[hidden email]] on behalf of Alan [[hidden email]] Sent: Tuesday, March 20, 2018 10:57 AM To: [hidden email] 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? ______________________________________________________________ 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]
Chuck, KE9UW
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Whoops! I meant 470 pF capacitors.
Chuck Hawley [hidden email] Amateur Radio, KE9UW aka Jack, BMW Motorcycles ________________________________________ From: [hidden email] [[hidden email]] on behalf of hawley, charles j jr [[hidden email]] Sent: Tuesday, March 20, 2018 4:36 PM To: Alan; [hidden email] 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 [hidden email] Amateur Radio, KE9UW aka Jack, BMW Motorcycles ________________________________________ From: [hidden email] [[hidden email]] on behalf of Alan [[hidden email]] Sent: Tuesday, March 20, 2018 10:57 AM To: [hidden email] 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? ______________________________________________________________ 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] ______________________________________________________________ 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]
Chuck, KE9UW
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