Has anyone here ever replaced a fan in a GR300 repeater housing?
If so, how tough of a job is it, and is the fan a stock muffin fan, or a Motorola specific part?
Thanks.
GR300 Repeater Housing - Fan Replacement
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railtrailbiker
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MSS-Dave
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Re: GR300 Repeater Housing - Fan Replacement
It's been awhile but I replaced lots... I got a fan from a surplus place for cheap and put it in. I wired up direct to 12 volts so it would run all the time. If you have the box in an office environment, that might be too noisy, mine were always in warm closets. Want to say it's a 4" x 1 or 2" size. Surplus was $10, bet /\/\ stock price breaks at least $30....
Dave
Dave
Re: GR300 Repeater Housing - Fan Replacement
I think Motorola's fan is more than that.
Use a good quality fan, don't scrimp here.. Remember there can be radiation from the fan motor that gets into the GM300 radios. Also mechanical vibration from the fan gets into the radio's VCO.
I use a 100-200 ohm resistor in series and a 470uF cap across the fan to help keep radiated and conducted noise out of the radios.
I use a thermastat on the TX heatsink to control the fan on lower duty cycle rptrs. 105F is a good ON point.
The later DuraCom power supplies included an external thermastat that mounted on the TX heatsink to control the fan.
Use a good quality fan, don't scrimp here.. Remember there can be radiation from the fan motor that gets into the GM300 radios. Also mechanical vibration from the fan gets into the radio's VCO.
I use a 100-200 ohm resistor in series and a 470uF cap across the fan to help keep radiated and conducted noise out of the radios.
I use a thermastat on the TX heatsink to control the fan on lower duty cycle rptrs. 105F is a good ON point.
The later DuraCom power supplies included an external thermastat that mounted on the TX heatsink to control the fan.