Don:
Thanks. Yes, I know what that is for. Without it when you work a
repeater, sometimes on returning form transmit back to receive, the
receive frequency jumps to the transmit frequency. As I recall the
problem is caused by transient drops in the voltage at that point as a
result of T/R switching. I put in this mod and it fixed the problem for
me. I put in a 4.7 uf cap. I when I heard about the mod, the value
mentioned was 1 to 4.7 uf.
73,
Bob WB2VUF
Don Bullard wrote:
> Bob,
>
> The capacitor is a 1uF, 50V electrolytic. It jumpers across resistor
> R32 (10k) with the positive end going toward Q8. R32 goes from ground
> to the base of Q8. Maybe it extends the reset signal to U4?? Not sure.
>
> I would be interested in details on the other cap you added to reduce
> the CTCSS level. Thanks!
>
> 73,
> Don W4IML
>
>
>
>> Don:
>>
>> I'm curious. Where in the circuit did they add the capacitor and what
>> was the value of the cap? I might be similar to the capacitor that I
>> added to my 1220 to cure the excessive CTCSS tone level.
>>
>> 73,
>>
>> Bob WB2VUF
>>
>
>
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