[Elecraft] KX1 Recvr nearly deaf (Was KX1 receiver alignment)

[Don Wilhelm]

Vin,

The voltage at the base of Q7 should be at or very near zero during receive.
The 0.7 volts is what is expected during transmit.

Try grounding the base of Q7 and see if the receiver comes more alive.  If
it does, you must chase down the source of the voltage on the base - first
check pin 7 of U3 which also should be zero during receive.  If it is not
then check the orientation of U3 (if U3 is backwards, get a replacement).

73,
Don W3FPR


> -----Original Message-----

>
> Some additional data.
>
> Voltages at U4, U5 and U6 check out OK.  However, the base voltages at Q7
> and Q9 are out of spec.
>
> Base at Q7 should be about .7V, but is about .37V  and base at Q9
> should be
> about .3V but is about .15V.
>
> I am continuing my troubleshooting, but welcome any and all advice.
>
>