In a message dated 2/25/2007 10:05:17 AM Pacific Standard Time, [EMAIL PROTECTED] writes: > As others have mentioned, the M-7A electret's output will be too high > for good performance on the K2 (400mV RMS ±6dB into 150 ohm load @ > 1kHz for 114dB SPL input), so you'll need to pad it down. And you'll > need a series 1uF capacitor (again, as others have mentioned). > > Jim, W6JVE, uses an aviation headset on the K2 with the Radio Shack > 1000:8 ohm transformer: > > > http://www.ac6rm.net/mailarchive/html/elecraft-list/2003-02/msg00306.html > > If you don't care about keeping the Clark headset in stock form, you > can replace the M-7A element with the three-dollar Radio Shack > electret element that will work with the DC voltage and expected mic > output level at the K2's mic jack. > > > http://www.ac6rm.net/mailarchive/html/elecraft-list/2004-01/msg00197.html > > Please let us know how it works out. This is good info. I already have an adapter box that I use to drop the headphone impedence from 150 ohms to about 8 ohms, so I was planning to add a few more parts to it to handle the mic. Thanks for interest and info and I will definitely let the group know how it turns out.
But first, I have to finish my K2. I have completed the Stage 1 checks successfully and am in the middle of populating the RF board. Stay tuned... Rob KC6ROC K2 #5924 _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
