[Elecraft] K3 temperature

[GW0ETF]

Since K3 #145 has had it's sub receiver the forward area of the right hand
side panel seems to get a little warmer and I've assumed this is due to the
sub rx or second dsp drawing extra through the 2 voltage regs bolted to that
panel. Shows it's all working ok since the panel is the heatsink for those
devices.

I don't understand how you could suspect the sub rx of increasing the PA
temperature if everything has been installed correctly.

BTW: I took part in a local RTTY contest for the first time the other
evening and was a little concerned about running full power despite
reassurances here. Running about 95 watts for 90 contest minutes I kept an
eye on the PA temperature and it never went above 46 deg; I put my hand over
the back once or twice and the fans seemed to be running but only slowly.
I'm now reassured.........



Stewart Rolfe, GW0ETF 


wayne burdick wrote:
> 
>> Since I fitted the second receiver, my K3 is running a whole lot
>> warmer, even on receive with the sub receiver turned off.
> 
> The aux DSP adds around 100 mA even when the sub receiver is turned 
> off, as I recall, so some increase in temperature is normal. The KRX3 
> module itself adds nearly zero current when turned off, and I don't 
> believe it could cause any increase in temperature since just due to 
> its location above the RF board. When turned on, the KRX3 adds about 
> 150-200 mA.
> 
> 

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