Hi Bill, NJ1H See also
http://www.k3pgp.org/432filter.htm This 432 MHz filter and protection device has a fraction of dB losses and so if fitted in front of a 70 cm preamplifier do not degrade very much it's Noise Figure. You can build it very easily at home. 73" de i8CVS Domenico ----- Original Message ----- From: "Bill Bordy, NJ1H " <[email protected]> To: <[email protected]> Sent: Tuesday, November 06, 2012 5:04 AM Subject: [amsat-bb] Phelps Dodge Cavity Resonator 406-512 MHz for mode J. Also request for info. > I am now on mode J with a transverter and my Flex-5000A. I picked up a > Downeast 144-28 transverter at the local hamfest, and experienced > overload on the 435 MHz downlink when transmitting on 2M. I had seen > this before with my FT-736R > > At a previous hamfest, I saw a Phelps Dodge Cavity Resonator marked > 406-512 MHz and bought it for $1 thinking that it may resolve the > overload problem. Well, I finally tried it in path for the 435 MHz . > > Wow, great fix. I have it in front of my 435 MHz preamp and now have no > movement of noise floor when transmitting on the 2M uplink. > > It also has CAT NO 495-509 marked on it. Not sure about the second 5, > could be a 3 since number is worn badly. > > I did a WEB search and didn't find any technical information specific to > this model. If anyone has information, would you supply me with a link > or info? > > If you can find one of these, don't pass it up. A single tuning > adjustment on top. I peaked it during a FO-29 pass. I then discovered a > local 435 MHz noise source, I think a cable distribution box, than I > could peak on also. Fortunately it is only in one direction and beam has > to be right on to see. > > There may be other cavity resonators that would work. > > 73, > Bill > NJ1H > > > _______________________________________________ > Sent via [email protected]. Opinions expressed are those of the author. > Not an AMSAT-NA member? Join now to support the amateur satellite program! > Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb _______________________________________________ Sent via [email protected]. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
