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Re: New KX1 low power and 20m oscillation

Posted by Don Wilhelm-5 on May 09, 2012; 12:51am
URL: http://elecraft.85.s1.nabble.com/New-KX1-low-power-and-20m-oscillation-tp7531133p7541256.html

Sooo??? - the KX1 is a "solder" type kit.  It is the KX3 that is "no
solder".:-)
I meant to say "collector" instead of "connector" - please forgive -
actually my excuse is that the letters are wearing off my keyboard and I
am not fully a touch typist - only halfway there, so you pardon the
mistypes.  The "E", "A". "N", and "M" are completely worn off and the
"C" is only half there.

73,
Don W3FPR

On 5/8/2012 8:36 PM, Geoffrey Mackenzie-Kennedy wrote:

> But that requires the use of solder :-)
>
> 73,
> Geoff
> LX2AO
>
>
> On May 09, 2012 at 02:02 +0200, Don Wilhelm wrote:
>
>
>> Actually, there is an easier test - just put a temporary jumper
>> between the connector and emitter of Q7.  Do not expect it to receive
>> with that jumper in place, but observe what happens to the sidebands
>> when you transmit.  If it cleans things up with the jumper in place,
>> replace Q7 and make certain R28 is well soldered.
>>
>> Stan reported a negative voltage on the base of Q7 - I trust that was
>> while transmitting, and if that assumption is true, I suspect R28 has
>> a problem.  One end of R28 should be near 6 volts when transmitting
>> and the other end should be near 0.6 volts.
>>
>> 73,
>> Don W3FPR
>
>
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