[TenTec] Argosy testing

[John]

Mike,

I apologize for not replying to you.  The Argosy is back on the air and 
working fine.  Cutting the red lead and running it through my old 
Tripplett Multi-meter showed at least some of the problem.  It looked 
like the transistors were a bit over driven so I backed off the driving 
amperage a little, and I seem to get good reports.  I also cleaned up 
the Model 700 mike that came with it and I have been a bit more 
sensitive to setting the SSB drive level,  The reports seem good so far. 
I am planning on taking it portable.  What can be nicer than a sandwich 
and and a QSO at lunch time.  Still working on what antenna to go with.  
AD5X has a nice portable vertical that can be adjusted for each band so 
no tuner is needed.  That seems to be it for now. Throw a 12 V sealed 
motorcycle battery in the trunk and I am good to go, as they say.    
With a little luck, we might just be able to work eacdh other.

73 for now,

John / WA1JG


On 2/23/2012 11:24 AM, Mike Bryce wrote:
> John,
>
> That's a decoupling cap and it's kind of standard design for solid state amplifiers. Just break the connection to the red wire feeding +13 v into the PA and insert an amp meter.
>
> Operate rig into a dummy load.
>
> BE VERY CAREFUL when working on that PA as the transistors are obsolete and TT does not stock them.
>
> RF parts have a sub but they are not as robust as the original ones.
>
> Mike wb8vge
>
> Sent from my iPhone
>
> On Feb 23, 2012, at 10:35 AM, John<jh.graves at verizon.net>  wrote:
>
>> I have been able to move the back panel out enough to at least see the
>> final amplifier board.  I am trying to figure out a safe way to insert a
>> ammeter into the power line to the final. Not there yet.
>>
>> As an aside, it appears that someone has added a 1000 mf electrolytic to
>> ground across the power line (red) to the final.  This does not appear
>> in the schematic that is in the manual.  Was there a problem with early
>> Argosys that this was meant to cure?
>>
>> -- 
>> John / WA1JG
>>
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