K3 mic probs
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Tnx to all that responded. I now have the hand mic working as it should be- all it took was to toggle the mic gain to high. However, the mic of choice will be via the rear panel and it will take some more detective work. The manual says it is a mono jack but I think what threw me was that the microKeyer employs a stereo plug. If indeed it is a mono jack, I will need to jumper the ring and the shield on the stereo plug that terminates the mic cord (other end is a 3 pin XLR). The mic is a dynamic one, a Heil PR-20. It seems to make sense that the low levels of less than stellar audio would be due to the return floating in a trs plug when the ring is unconnected. The shield must be picking up some to give me something. The cable is good so only other option is bad mic but I haven't tried it on another radio yet. Sounds like a project for a three day weekend, hi.
Does the K3 employ a mono or stero jack for the rear mic connection? tnx es 73, Jim W5QM ______________________________________________________________ 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 |
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Jim,
You can verify by looking at the schematic - but - The rear microphone jack is indeed a stereo jack, but the signal is mono. A stereo plug is just great, the AF line should connect to the tip and the shell. 73, Don W3FPR Jim Hoge wrote: > Tnx to all that responded. I now have the hand mic working as it should be- all it took was to toggle the mic gain to high. However, the mic of choice will be via the rear panel and it will take some more detective work. The manual says it is a mono jack but I think what threw me was that the microKeyer employs a stereo plug. If indeed it is a mono jack, I will need to jumper the ring and the shield on the stereo plug that terminates the mic cord (other end is a 3 pin XLR). The mic is a dynamic one, a Heil PR-20. It seems to make sense that the low levels of less than stellar audio would be due to the return floating in a trs plug when the ring is unconnected. The shield must be picking up some to give me something. The cable is good so only other option is bad mic but I haven't tried it on another radio yet. Sounds like a project for a three day weekend, hi. > > Does the K3 employ a mono or stero jack for the rear mic connection? > > ______________________________________________________________ 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 |
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In reply to this post by Jim Hoge-2
> The manual says it is a mono jack but I think what threw me was that > the microKeyer employs a stereo plug. If indeed it is a mono jack, I > will need to jumper the ring and the shield on the stereo plug that > terminates the mic cord (other end is a 3 pin XLR). Like many other manufacturers, Elecraft and microHAM both use TRS plugs and jacks in "Mono" mode simply by floating the ring. You should not jumper the ring and the sleeve - there is no need to do so as the sleeve contact in three conductor jacks is very close to the base of the plug (front panel). The shield must be picking up some to give me something. The expected connection for ANY dynamic microphone in both the K3 (rear panel) and microHAM microKEYER II (front panel- EXT Mic) is mic hot to the tip and mic return to the sleeve. The shield should float when using a mono input; it should be tied to the CHASSIS (shell) when using balanced input connection (e.g., a Foster, XLR connector or even a STEREO input TRS jack). 73, ... Joe Subich, W4TV microHAM America, LLC. http://www.microHAM-USA.com http://groups.yahoo.com/group/microHAM On 7/2/2010 11:21 AM, Jim Hoge wrote: > Tnx to all that responded. I now have the hand mic working as it > should be- all it took was to toggle the mic gain to high. However, > the mic of choice will be via the rear panel and it will take some > more detective work. The manual says it is a mono jack but I think > what threw me was that the microKeyer employs a stereo plug. If > indeed it is a mono jack, I will need to jumper the ring and the > shield on the stereo plug that terminates the mic cord (other end is > a 3 pin XLR). The mic is a dynamic one, a Heil PR-20. It seems to > make sense that the low levels of less than stellar audio would be > due to the return floating in a trs plug when the ring is > unconnected. The shield must be picking up some to give me something. > The cable is good so only other option is bad mic but I haven't tried > it on another radio yet. Sounds like a project for a three day > weekend, hi. > > Does the K3 employ a mono or stero jack for the rear mic connection? > > tnx es 73, Jim W5QM > ______________________________________________________________ > 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 |
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It turns out that the rear panel jack is the culprit. I made an XLR to 8 pin cable and a mini TRS to 8 pin cable and tested via the front panel. The mic works just fine. The plan was to use the XLR to mini TRS and connect via the back panel. The cable was tested through the front panel with the second adaptor. This leaves the rear panel jack as the culprit. The Heil PR-20 mic needs higher gain settings than the hand mic I tested and they both needed the higher mic gain to be set via menu. I'll try and diagnose the rear panel jack later and I'm hoping the problem is something simple like a cold solder joint. That might explain the really weak signal when the mic is routed that way. tnx, Jim W5QM ______________________________________________________________ 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 |
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