[Amps] UM4001CR pin diode source - or Alpha 86 vac relay mad

[Chris Wilson]

Hello Jerry,

 Friday, August 7, 2020

 Thanks, I have sent a request to join, much appreciated.


Best regards,
 Chris    2E0ILY       mailto:chris at chriswilson.tv


JS> Go to the alpha 87  ioGroups there in file section are several
JS> replacements .. arrow electronics had hundreds for about $40 each just months ago

JS> Jerry NY2KW

JS> Sent from my iPhone

>> On Aug 7, 2020, at 7:27 AM, Chris Wilson <chris at 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 at chriswilson.tv
>> 
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