[Elecraft] XV50 help needeed

[DAVID HEMINGWAY]

Hi

Sadly it would apear that the extra current is flowing through the gate of 
Q3. indicating a replacement is indeed required.

Good luck and 73,

Dave G8EGG

> Hi,
>
> I have the same problem with my XV50 that someone on 2005 wrote this
> post below. Look at his message... but nobody gave an answer.... Good
> someone help me with that one ???
>
>> This morning on our local 6 meter CW sked, I was barely able to
>> hear guys
>> that are usually very strong signals. Opening up the transverter, I
>> discovered that I am unable to adjust the LNA Bias Adjustment(R13)
>> for Q3 to
>> the required 200 - 275 mV. It adjusts from a low of about 4 mV up
>> to 55 mV.
>> I've got 13.7 V at 12R, 3.74 V at the R12/R15 junction, and 0.650 V
>> on the
>> drain of Q3. Current coming down that leg is 55 mA based on voltage
>> drops
>> across R12 and R15. With 55mV (TP2) drop across R14, a current of
>> through
>> R14 of about 12 mA is indicated. I think this means that Q3 (or
>> something
>> else) is sinking about 43 mA (55 mA - 12 mA). (If my memory of Mr
>> Kirkoff's
>> laws are intact).
>>
>> My question is: Has Q3 has bit the dust?
>>
>> Thanks...
>>
>> 73,
>> Ken Wagner K3IU
>
> ===========================
>
> Jean-François Ménard / VA2VYZ
> Elecraft K2 #4130
> Elecraft KX1 #999
> FISTS #11896
> SKCC #2245
>
> http://web.mac.com/jf.menard