[Kenwood] TS-711A sensitivity questions

[Gary Peach]

> I have been attempting to recover a rather poorly TS711 for some time
> now and am stuck with a sensitivity problem, the 10dB S+N:N comes in
> about 10dB or more worse than spec. Would just like some confirmation
> that my thinking is sound before going any further.
> 
> Reading the level diagram in the service manual suggests that there
> should be some 17dB of gain between the RA terminal and the output of L2
> on the RF board. I'm using a spectrum analyser with tracking generator
> so I can see the shape of the filter, which looks correct, but I have
> about 5 or 6 dB loss. My thinking is that the first active device is
> fried but before going any further with this I want to be as sure as
> possible that this is likely the case. Finding Gasfets here is
> impossible so I'd like to be sure.

Before tearing the set apart try measuring the [S+N]/N with a meter at the Loud speaker terminals.
Use the appropriate mode to match that used by the spec writers.
How do you check the power level of your RF signal in?

Set up the noise level for your test with a matched load attached to the antenna terminal/socket of the Rx.

73 Gary7SLL