Bob, Unlike other radios (Icom, Kenwood, Yaesu, etc) that have their own method of wiring the mic jack and make it inconenient to impossible for the user to change it, the K2 has a microphone configuration header so you can rearrange the mic jack wiring to suit any 8 pin microphone configuration. The information for the wiring required is in the KSB2 manual.
Yes, an Icom mic can be used on the K2 - connect the microphone configuration header for the Icom wiring and in the case of the the electret type mic elements, add a resistor from the AF mic pin to +5 volts. Most mics suggest a 10k resistor, but usually the other end of the resistor is connected to an 8 volt supply - the K2 supplies only 5 volts and a 5.6k resistor is more appropriate. In the case of Icom wiring, the resistor connects between pins 1 and 2 and the mic header has a jumper from the 5V pin to pin 2. 73, Don W3FPR > -----Original Message----- > > There seems to be differing opinions about whether the Heil HM-4 > and HM-5 provide enough output to properly drive the K2. Looking through > the HRO catalog, I found that Heil now has several electret mikes > (HM-iC, iCM, etc.) which they say gives higher output, but they also say > these work only for ICOM radios... Does anyone have experience with > these mikes? Do they solve the low drive problem for the K2?... And why > are they "only for ICOM radios"? And one final question: are they likely > to work better than the mike that I'm using that I put together using a > $3 Radio Shack electret replacement element (plenty of drive, but > mediocre audio reports)? > > Thanks. > > Bob W1SRB > -- No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.432 / Virus Database: 268.15.25/593 - Release Date: 12/19/2006 1:17 PM _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net 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
