I use an xtal element D-104 with the built in pre-amp in the bottom of the stand all the time with my K2 and get great audio reports. Just be sure to keep the gain on the mic amp low or you will overdrive the input to the K2. If you don't have the stand with the amplifier in it you could easily build a one transistor amp that would do the job - see the Elecraft web site. If you are going to go straight in to the K2 without the aid of an external pre-amp, I'd recommend a "fix" from the "old days" of placing a 200 K or larger (up to 2 meg) resistor in series with the hot lead of the mic. The D-104 was designed to look into the grid of a vacuum tube (remember those?) and that is generally very high impedance. The resistor in series with the hot lead will allow the audio response to develop some low frequencies that are greatly attenuated when you run the high impedance mic into a very low impedance input. If you go the resistor route, the audio drive to the K2 input will likely be marginal. Some have used a small step-up transformer instead with some success. All in all, properly terminated, the D-104 is still very hard to beat for great audio quality and punch! YMMV Have fun, 73 es gud dx --don n4hh K2/100 #2028 KAT100, KX1 #243, etc, etc.
----- Original Message ----- From: "linda doyle" <[EMAIL PROTECTED]> To: <elecraft@mailman.qth.net> Sent: Wednesday, August 04, 2004 7:33 AM Subject: [Elecraft] D104 use with k2/100 has anyone been sucessful with using the D104 xtal element with the k2/100,I'm wondering if the preamp will sucessfully make the transformation from high impedence to low impedence that the k2/100 needs would appreciate any input..Am Presently using the k2 proset but my audio reports are less than flattering..John K1GUN _______________________________________________ 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 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.728 / Virus Database: 483 - Release Date: 7/27/04 _______________________________________________ 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
