I've been having some success replacing the preamp in the base of amplified D104 mics with an FET buffer stage to ensure the crystal element is working into a very high load impedance. See...
http://www.wd8das.net/D104-FETbuffer.gif The 4.7k resistor in the drawing can be changed to match other rig input impedances. Steve WD8DAS [email protected] http://www.wd8das.net/ --------------------------------------------------------- Radio is your best entertainment value. --------------------------------------------------------- ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/[email protected]/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: [email protected] To unsubscribe, send an email to [email protected] with the word unsubscribe in the message body. This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
