On Mon, 2007-07-30 at 16:26 +0100, Bob Towers wrote:
> Some time ago the power output on my Argonaut V dropped to nearly zero
> on all bands.
>
> TenTec say the most likely cause is
>
> a) one or more of the switching diodes in the LPF circuits
> or
> b) blown finals
>
Open switching diodes in the LPF circuits could lead to blown finals by
letting the transistors develop excess voltage when not loaded. An open
makes a high SWR for the transistors.
> I rarely ran it at more than 10W and was always pretty careful about
> running it into high SWRs.
>
> The rig is well out of warranty and getting it to TenTec across The Pond
> and back is pretty expensive, so I'm wondering whether to find and fix
> the problem myself.
>
> I've recently built a K2, so I'm not too scared of complex PCBs.
>
> Has anyone fixed a similar problem themselves? If so, any help would be
> much appreciated.
>
> 73
>
> Bob Towers
> MM0RKT
>
73, Jerry, K0CQ
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