[Elecraft] [K2] No power on transmit

[Brian Denley]

Don:
Thanks for the advice.  I do have a Tek 2225 with 10x probes so I will start 
with that.  I wasn't aware that they would be acceptable as RF probes.  I 
might just start on page 10 and go through everything.
Thanks again for the help!
Brian
http://home.comcast.net/~b.denley/index.html


----- Original Message ----- 
From: "Don Wilhelm" <w3fpr at embarqmail.com>
To: "Brian Denley" <b.denley at comcast.net>
Cc: "Elecraft Reflector" <elecraft at mailman.qth.net>
Sent: Saturday, August 21, 2010 8:41 AM
Subject: Re: [Elecraft] [K2] No power on transmit


> Brian,
>
> I think you are in for some Transmit Signal Tracing.  If you do not have a 
> 'scope with a 10X probe or an RF Probe already, build up the RF Probe 
> included with your K2 kit.
> Then turn to Appendix E in the manual and follow the procedure for 
> Transmit Signal Tracing.
> Note that the steps on page 14, the "expected" values are shown for a 
> properly working K2 at 5 watts.  The RF Voltages that you should see will 
> be higher - up to the point of the failing stage where it will drop lower. 
> You are looking for that first point where the RF voltage is lower than 
> the expected value.
>
> 73,
> Don W3FPR
>
> Brian Denley wrote:
>> I have completed the last assembly steps leading to Alignment and Test 
>> Part 3 and started the testing.  Everything went OK until I keyed the 
>> transmitter (using TUNE) at 2 watts.  The most power I can get on the 
>> internal power meter is .5 watts.  I do see the current draw rise to 
>> about 0.44 amps (from 0.22).  Adjusting L1,L2 have no effect so there 
>> must be a problem in the RF circuit somewhere.  The receiver stil works 
>> fine.  I looked at T1-T4 but I don't see anything wrong with the 
>> windings.  Anyone know what the most probable causes are to start my 
>> troubleshooting phase?  BTW I used a 50 ohm dummy load rated at 50 watts. 
>> I will admit that installing T4 links was extremely difficult due to the 
>> closeness of other components.
>> Thanks
>> Brian Denley
>> http://home.comcast.net/~b.denley/index.html
>>
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