If any of you guy want it I have a schematic for a Mic Pre using a SSM 2019 Mic Preamp chip. It has a NE5523 line driver output and requires a 15 V. bipolar supply. It's real straight forward, very quiet, and you can get all the parts from Mouser or Digikey.
Bill AD5OL ________________________________ From: "sbjohns...@aol.com" <sbjohns...@aol.com> To: amradio@mailman.qth.net Sent: Tuesday, September 22, 2009 12:11:23 AM Subject: Re: [AMRadio] Mic recommendation for rig OK, Bob - I see you're a "nut" like me -grin- so I should describe my current set up for 160m AM. Right now my Gates BC1T has a Sennheiser 421 dynamic cardioid mic (set one click off "M"), feeding a Berhinger VX200 mic processor. Then it goes thru a fairly noisy Logitek rack mixer to an equalizer to let me roll the highs off to avoid being too wide, That in turn feeds a 4-band Texar Audio Prism, then a hot-rodded 3-band Dorrough DAP-310 with the second generation AM limiter card. The processors are all running pretty gently. There's picture of the audio rack on my website at the bottom of the page related to the Gates transmitter: http://www.wd8das.net/gates.html Steve WD8DAS sbjohns...@aol.com http://www.wd8das.net/ --------------------------------------------------------- Radio is your best entertainment value. --------------------------------------------------------- -----Original Message----- From: Bob Peters <rwpet...@swbell.net> To: 'Discussion of AM Radio in the Amateur Service' <amradio@mailman.qth.net> Sent: Mon, Sep 21, 2009 7:51 pm Subject: Re: [AMRadio] Mic recommendation for rig Steve I use a UREI BL-40 Modulimiter...and it has A symmetric as well I have a CBS Labs Limiter...and getting the CBS labs AGC as well as a pair... Bob W1PE -----Original Message----- From: amradio-boun...@mailman.qth.net [mailto:amradio-boun...@mailman.qth.net] On Behalf Of sbjohns...@aol.com Sent: Monday, September 21, 2009 6:42 PM To: amradio@mailman.qth.net Subject: Re: [AMRadio] Mic recomendation for rig The most important single accessory item to have in your AM shack is a way to monitor modulation - a cheap o'scope is a good choice. Keep an eye on it to ensure you have reasonably strong average modulation levels, and negative peaks that don't go all the way to 100% and pinch off the carrier. You current quest for a good mic is already underway. The next item I would want is a compressor-limiter. This device allows you to wander a bit from the microphone, or get excited speaking loudly, without under or overmodulating. You can get a "microphone processor" which combines a mic preamp with equalizer, compressor, limiter, de-esser, and such. I'm fond of the Berhinger ULTRAVOICE VX2000 for that job. They go for maybe $70 on eBay. I sometimes run more elaborate AM broadcast processors on my rigs, too... but that's because I'm a nut. The Berhinger ULTRAVOICE VX2000 alone does a great job for ham AM work. On the other hand, on my Apache I use a plain D104 driving the musical instrument (High-Z) input of a DBX 163X compressor-limiter - sounds great and very simple. They usually go for $80 on eBay Steve WD8DAS sbjohns...@aol.com 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/amra...@mailman.qth.ne t/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net with the word unsubscribe in the message body. 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This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net 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 ______________________________________________________________ Our Main Website: http://www.amfone.net AMRadio mailing list Searchable Archives: http://www.mail-archive.com/amradio@mailman.qth.net/ List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Post: AMRadio@mailman.qth.net To unsubscribe, send an email to amradio-requ...@mailman.qth.net 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
