Wednesday, December 31, 2014

CDM 1550 duty cycle

My good friend Tom KJ9P did some testing of the use of Motorola CDM 1550 mobile radios as repeaters. You can use these as repeater receivers or transmitters, but you will need to add a cooling fan. I also recommend not running higher than 50% of the rated power output.

Here's Tom's results:

At idle, and both receivers on, the power consumed is .4 amps.

 

At Low Power Transmit (8 Watts out) the power consumed is 2.6 amps.

 

At High Power Transmit (22 Watts out) the power consumed is 4.0 amps.

 

Temperature rise after one minute of keydown on either low or high power is two degrees with fan cooling 100% of the time.

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