[1000mp] Mark V PA failure. Need source for devices

[Rob Atkinson]

Hi Martin,

the pa gets fried running class A because the operator usually does not 
understand that in class A the rig has to dissipate _more_ heat running 
low power than it does at the rated maximum.   so owners turn down the 
PA collector current pot (usually labeled drive or power) thinking they 
are saving the PA when in fact they are doing more damage.  anyway,   
class A is  supposed to put out a low 3rd order IM product compared to 
class AB but when you get it fixed I'd forget about class A, make sure 
the heat sink fan is working and limit it to a pep of 175 w. on ssb and 
save the PA.

73

rob / k5uj


On Wednesday, August 1, 2007, at 11:16  PM, Martin Sole wrote:

> I have a 1000MP Mark V that appears to have suffered PA failure. Both 
> PA FET's show short circuit from gate to drain. I see on line that 
> Digi-Key in the US has them for $65 each and RS components in the UK 
> has them for £71 (about $142) each. These are the only two sources I 
> have been able to locate where I might be able to buy them relatively 
> easily. Any other sources known?
>
> Is the PA failure common? The original owner told me that it failed 
> when operating in Class A.
>
> Thanks
>
> Martin, HS0ZED
>
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