Morning John,
Can you:
- measure the receiver's sensitivity, or
- compare its sensitivity against another (good) receiver (if you don't
have a signal generator then a weak interferer from the TV/computer will
do, and to measure SINAD you can use Spectrum Lab from DL4YHF)
I have an Argonaut V and a 6n2 and I tend to remember that both do the same
thing you describe with the s-meter. Unfortunately I'm away from home most
of the week so I cannot check until (probably) Wednesday.
73,
Carlos VK1EA
On Mon, Oct 26, 2020 at 5:48 AM John Hodge <john@hodge.uk.com> wrote:
> Good morning/afternoon/evening,
>
> I have an Argonaut V 516 with a noisy receive front end. Without an
> antenna connected, the S-meter shows a varying signal level between S1
> and S3, on all bands.
>
> I suspect one of the RF preamp FETs but because the RF board is a
> plug-in and I don't have extenders it's nigh impossible to carry out
> live checks. Had the board out, removed the tin shield and cold checks
> on the 3 FETs show a measureable discrepancy in resistance readings on
> one of the FETs. All 3 circuits look the same in the manual.
>
> Does anyone have any experience working on this model? Anyone know what
> the SMT FETs are? Any help would be appreciated.
>
> 73, John G8CCD
>
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