[Milsurplus] RT-524 fan noise

[John Vendely]

The RT-524 (and RT-246) fan was actuated both by via PTT action, or by a 
thermostatic switch.  The thermostatic switch started the fan if the PA 
assembly overheated, regardless of PTT action.  It's not uncommon to hear 
the fan start in receive mode in vehicular installations where the radio is 
exposed to direct sunlight for extended periods.  Long periods of retrans 
operation can also cause continuous fan operation.  BTW, this often caused 
confusion among GIs, who thought the radio had become "stuck in transmit". 
If you're operating in a typical, reasonably cool indoor environment and 
transmitting intermittently, you could disconnect the PTT-based fan control. 
You may hear the fan start even in receive mode, if the temperature gets too 
high.

73,

John K9WT


----- Original Message ----- 
From: "Yong Surk Lee" <yonglee at yonsei.ac.kr>
To: <milsurplus at mailman.qth.net>
Sent: Sunday, August 16, 2009 12:12 AM
Subject: [Milsurplus] RT-524 fan noise


> Hello;
> Does someone have experience of reducing fan noise of RT524?
> Mine generates a loud fan noise when transmitting the RT524.
> I am thinking of disabling the fan motor or putting a series resistor
> to slow down the motor.
> Any suggestion?
> de WW6N
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