[Elecraft] K3 and Alpha 87A SWR

[Gary K9GS]

I've been following this thread with interest.

I have a K3 and an Alpha 8100.  The 8100 uses a pair of Pentodes fed 
through a swamped grid.  I believe the Alpha 99 does as well.  I think 
this is why Merv and I have never seen issues involving the coax length.

For the record, the Alpha manual for the 8100 does state to NOT use a 
tuner in the exciter.


On 8/22/2012 7:10 PM, Merv Schweigert wrote:
> I use a 99 with the K3 and any length coax works just fine,  it there is
> SWR on the
> line there is a problem someplace,   have never had to cut a coax to any
> particular
> length.
> If theres SWR its either a ground differential problem between the amp
> and radio chassis or the
> tuned input is not correct,  or the amps input resistor has been cooked.
> Merv K9FD/KH6
>> On Aug 22, 2012, at 1:01 PM, Jim Brown<jim at audiosystemsgroup.com>  wrote:
>>
>>     
>>> You
>>> might try engaging the auto tuner in the K3 if you have one.
>>>       
>> Be aware that both the Alpha 87A and 99 manuals tell you "NEVER use an automatic antenna tuner into or through the [87A or 99].  This will cause damage to the Input Wattmeter&  Input Relay."
>>
>> It's largely because of this prohibition that I don't even have a KAT3 in my K3.
>>
>> Bud, W2RU
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-- 


73,

Gary K9GS

Greater Milwaukee DX Association: http://www.gmdxa.org
Society of Midwest Contesters: http://www.w9smc.com
CW Ops #1032   http://www.cwops.org

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