Looks like you are on the final stretch. Be sure and let us know the end of
the story. Thanks for sharing your experience.
> From: prosolar@sssnet.com
> To: tentec@contesting.com
> Date: Sat, 21 Mar 2009 12:36:54 -0400
> Subject: [TenTec] Argosy II the battle won but the war's not over
>
> Hi Gang!
>
> A quick update on the Argosy II project.
>
> After more tests and a few experiments, I concluded that the PA was in
> fact only running on one output transistor.
>
> I would rather pick fly poop out of pepper than dig into a solid state
> PA, but that's what had to be done.
>
> As it turned out, one of the finals had a collector to emitter error.
> While not a complete short, there was about 2k worth of resistance
> between the two leads.
>
> The other one tested just fine.
>
> However!!
>
> As you may or may not know, the finals used in the Argosy series are
> no longer made. The MRF477 are just gone. I called RF parts and they
> had one pair left...at $90 ( I did not ask if that was for the pair or
> for just one)
>
> There's three avenues
>
> 1. MRF479 A bit less power, and $26 each
> 2. MRF497 A bit more power and $40 each
>
> 3. Leave it as is and run with just one PA transistor.
>
> I chose door number 1 and will have the new parts in house sometime
> next week.
>
>
> The story continues...
>
> Mike, WB8VGE
> SunLight Energy Systems
> The Heathkit Shop
> http://www.theheathkitshop.com/
> J e e p
> o|||||||o
>
> A man with one clock knows what time it is. A man with two clocks is
> never sure.
>
>
>
>
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