Correction: I meant to say, if the receiver goes dead when you switch from
STBY to OPER, replace the LittleFuse.
73,
Bob, N6TV
On Fri, Aug 7, 2020 at 1:55 PM Bob Wilson, N6TV <n6tv@arrl.net> wrote:
> If the receiver goes dead when you switch the Alpha 86 from transmit to
> operate, it usually means the LittleFuse on the receive pin bias board has
> opened. Check that first. It's easy to replace; just remove the top
> cover, and it is right there, near the center of the rear panel. I had to
> replace that fuse several times, usually after transmitting on 160m;
> nothing wrong with the PIN diodes.
>
> 73,
> Bob, N6TV
>
> On Fri, Aug 7, 2020 at 4:27 AM Chris Wilson <chris@chriswilson.tv> wrote:
>
>>
>>
>> 07/08/2020 12:07
>>
>> I have an Alpha 86 here with suspected TX / RX switching pin diode
>> failure. The amps TUNE function is suspect, and switching between
>> standby and operate gives a vey attenuated RX signal in standby mode.
>> In TX it seems to operate, TUNE display aside, normally.
>>
>> The manual's schematic shows them as stud mounted UM4001CR devices. I
>> am unable to source these, does anyone know of a current source for
>> them please? Alternatively does anyone have instructions for
>> conversion to using two vac relays? Fast CW is not required, and the
>> noise of the vac relays not really a concern. Thanks.
>>
>> --
>> Best Regards,
>> Chris Wilson.
>> mailto: chris@chriswilson.tv
>>
>> _______________________________________________
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>> Amps@contesting.com
>> http://lists.contesting.com/mailman/listinfo/amps
>>
>
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