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

[Hans Remeeus]

I had exactly the same with my former Mk-V. I used Class A to run my 
linear, but after a while the PA burned out.

Yaese had to note clearly in the user manual that Class A has it 
limits... Because of this lack I paid the dealer 50% of the bill to 
replace the PA FET's. The rest was paid by our distributor.

IMHO it's better to use Class A only for digital communication (like 
PSK31) and use as low power output as possible for a solid QSO.


73,
Hans Remeeus (PA1HR)
http://www.remeeus.eu
Communication is about people, the rest is technology.



Rob Atkinson schreef:
> 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
>>