Thanks Jim and points well taken.
Philip LaMarche LaMarche Enterprises, Inc. www.instantgourmetspices.com www.W9DVM.com 727-944-3226 800-395-7795 pin 02 FAX 727-937-8834 NASFT # 30210 W9DVM -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jim Candela Sent: Monday, April 09, 2007 12:06 AM To: Discussion of AM Radio in the Amateur Service Subject: Re: [AMRadio] Need advice! Phil, The 32V series is basically a 100 watt carrier, and 400w PEP transmitter at 100% modulation. Since the legal limit is 1500w PEP, you need an amplifier that has about 6 DB of gain, to say ~ 375 watts carrier, and ~ 1500w PEP output with 100w carrier and 400w pep input. To my knowledge, a commercial amplifier does not fit this requirement unless you insert a 3-10 db attenuator to reduce the 32V power such that the amplifier will not be over driven. A Heath SB-220 will do with 15-25 watts carrier drive. Several years ago I posted a concept amplifier using a pair of 304 TL's in parallel, grounded grid, with a pi-network output. Some rough calculations showed 6 db of gain, and 400w in made 1600w out in class Ab2 (or was it class B). Unfortunately I lost my notes on this concept amplifier. A G-G 4-1000 amplifier might also be a candidate to explore, especially if the B+ is not too high (opening myself up here to the B+ %eff debate..:-)) Since 6 db is ~ 1 S-unit, maybe you are better off sticking with 100w (400pep), and boosting your antenna a little higher free from things that might lower antenna efficiency.. Is an amplifier with less than 10db gain worth the effort? It all depends, and you be the judge. regards, Jim JKO ----- Original Message ---- From: Phil LaMarche <[EMAIL PROTECTED]> To: Discussion of AM Radio in the Amateur Service <[email protected]> Sent: Sunday, April 8, 2007 8:04:25 PM Subject: [AMRadio] Need advice! I'm getting ready to use a Collins 75A-1 and 32V-1. What commercial amplifier would be best to up the power and be heard. Appreciate all comments. Thanks Phil Philip LaMarche LaMarche Enterprises, Inc. www.instantgourmetspices.com www.W9DVM.com 727-944-3226 800-395-7795 pin 02 FAX 727-937-8834 NASFT # 30210 W9DVM ______________________________________________________________ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. ______________________________________________________________ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body. ______________________________________________________________ AMRadio mailing list List Rules (must read!): http://w5ami.net/amradiofaq.html List Home: http://mailman.qth.net/mailman/listinfo/amradio Partner Website: http://www.amfone.net Help: http://mailman.qth.net/mmfaq.html Post: mailto:[email protected] To unsubscribe, send an email to [EMAIL PROTECTED] with the word unsubscribe in the message body.
