[Elecraft] Interesting KPA100 partial power control loss

[Ken Nicely]

I don't think it comes with the amp.  It is just a cable with RCA  
connectors on each end, one half of a left right speaker cable will  
do.  Some claim it should be shielded cable, but I have used  
unshielded with no problems.

KEN. KE3C




On Feb 21, 2010, at 3:09 PM, David Herring <david at k6dch.com> wrote:

> Does the AL-811H come with the necessary relay cable that will work  
> with the K3, or is that an add-on purchase?  If it's an add-on, then  
> which one would one get?  I only see YaeKenCom cables listed at Ameritron.com 
> .
>
> Thanks,
>
> David, K6DCH
>
>
>
> On Jan 23, 2010, at 11:55 AM, Ted Turk wrote:
>
>> Good evening all,
>>
>> K2/100 #5822 started yesterday producing nearly double the requested
>> power.  Below 10W fine.  50W requested gave about 100W and max power
>> was approaching 160W on lower bands!!  I searched the reflector
>> archive to confirm my memory of posts on the problem over the years.
>> As suggested by Don W3FPR in the past, I replaced D16-17 with 1N4148
>> diodes to see what happened before delving further, fearing damage to
>> U5 or U6.  On reassembly the problem was fixed!
>>
>> I checked the removed 1N5711's with a Peak DCA55 and both appeared
>> normal (low voltage test only I suppose).
>>
>> Have been playing with a kit built Linear Amp Ranger (572B) recently
>> (circuit similar to Ameritron AL-811HD) and I am suspicious that on
>> powering down the heavy toroidal mains transformer may be producing a
>> small 'EMP' since occasionally it freezes up a nearly G4 iMac.  The
>> antenna is either disconnected or switched to a dummy load when off-
>> air.  No recent thunderstorm activity here - midwinter.
>>
>> Does anyone have any ideas on how to reduce this turn-off spike, in
>> case this is the cause?  All gear is fed from UK 240V mains via surge
>> protected power outlets.  Meanwhile I will be even more vigilant with
>> antenna disconnection and grounding.
>>
>> 73,
>>
>> Ted G7BQM
>>
>>
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