Hi Frank and the group,
About three years ago I put together a "Low Bucks" repeater (UHF), using two GE "MVS" radios. Kept each radio intact and used the option cable to all input/output to an NHRC-4 controller. No tuning or mods to xmitter, and peaked the receiver for assigned frequency. Both transceivers fit into metal box. Controller (In aluminum box) is mounted on top of the radio(s) enclosure.
Even though the radios orig. were on 406 mHz (Low split) they work well at 443/448 mHz.(eighteen Watts to antenna)? The MVS is a great radio. Well built and cheap to purchase.
Of course I am using a fan on transmitter heatsink. After three years of service, NO PROBLEMS! NO DESENSE!
Tim AE7TH
Vashon Is Wa.
On 01/19/2021 8:49 AM Frank Perkins <n6ces.r@...> wrote:
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Hi folks,
Just another note about using mobile radios in a repeater. Yes, their IFs were wide (stagger-tuned) to allow good function across the band coverage.
However, since in single-frequency repeater use, all that is needed is to sharpen the tuning to greatly improve selectivity and sensitivity. Same with the front end.
Thoughts?
Frank N6CES
roger that .
The old? IF? filters were wide.
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Peter, Be careful on those old radios you mentioned. While I built many "IC-20" repeaters in the '70s that was when we had 30 KHz spacing between slots and they worked well. Presently, that won't work very well in a populated area with 20 KHz (or less-scary thought) spacing of repeater pairs. To get around that you could change out the IF filter as a bare minimum.? And, if you are in some third-world county with little to no repeaters around that may work.?
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Regards, Karl Shoemaker
To contact me, please visit SRG's web site at?
for the current email address.
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