Repeater

[elmanoduarte]

Hi

There´s any conections to do Repeater with a GM-300 and a yaesu FT-11, for exemple, using the GM for TX and the FT for RX, or inverse ?? Mabe the GM for reciving and the FT for TX !

[Jim202]

Hi

There´s any conections to do Repeater with a GM-300 and a yaesu FT-11, for exemple, using the GM for TX and the FT for RX, or inverse ?? Mabe the GM for reciving and the FT for TX !

The safest way to do this is with some sort of controller connected between both radios. This way
you have the ability to control the tail duration of the transmitter, the time out timer to prevent the
repeater package from locking up on an input signal that doesn't go away. Then there is the issue of controlling or having the ability to adjust the audio levels between the radios.

Point to bring out here is that nether of these radios is made for continuous service. With that
being said, the chances of burning up these radios PA stage is high in repeater service. These
radios don't have the heat sink ability to get rid of the heat for more than short transmissions.
Not sure that even adding a fan to try cooling them will do much good.

Jim

[AEC]

Not only do the 'hammy' radios have adequate weatsinking capacity, they are also pretty lousy with IMD products ruining the RX signals, even with a duplexer.
The GM has a better receiver in that respect, but in TX service, heat is always a huge issue, especially in repeater duty.
Even transmitting at the lowest power level will not ensure cooler running if you are unable to properly adjust the current when in transmit.
2 watts will cause the heatsink to get really hot in short order, and as stated previously, a fan may not be enough.
Remounting the entire PA to a much larger surface area with a copper heat spreader would be a better choice.

[elmanoduarte]

I do have a Repeater with 2 GM-300, the TX is about 7 wats out, in fact in long transmissions, get realy hot, alredy using a fan for cooling it done mutch better in did. Madde this topic just for test. I´ll do some tests, than i tell what happen