[Elecraft] XV smokin' hot

[Colin VE3MSC]

At 07:20 PM 2011-01-07, Don Wilhelm wrote:
>It should not get that hot that fast.
>Do you have the fan installed the right way around?
>Is the fan running?

Its pulling air up from the bottom, and blowing air up. It comes out 
the holes above the attenuator resistors.

>   Is the bias for the power module correct? - your DMM may read 
> 0.02 volts or 0.020 volts depending on the number of digits it displays.

It was running way hot at a bias of 0.0200, and I slightly increased 
it and subsequently got more output and less heat.  The manual said 
to look for 3-5V on VGG, and I'm only seeing about 2.25 (at bias 
0.02) and 2.4 at my current bias level.
The current consumption is less than 4A at about 13.6V.
I should mention am running it continuous (1min on/off) (not SSB) as 
I do a lot of digital work.

>On 1/7/2011 6:25 PM, Colin VE3MSC wrote:
>>I've built up all 3 XVs, and find the 432 the hottest of the bunch.
>>What are you doing to manage the heat ?  My output power drops and
>>the case hits over 60C / 140F if I run for a minute at about
>>10W.  (Attenuator not a factor as driving at low level).
>>VE3MSC Colin