[amsat-bb] Phelps Dodge Cavity Resonator 406-512 MHz for mode J. Also request for info.
Bill Bordy, NJ1H
nj1h at comcast.net
Mon Nov 5 20:04:52 PST 2012
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
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.
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