RE: K2 4039, Failing transmitter tests

[Nicolas Pike]

Hi,

I have steadily and carefully built my K2 and it has passed all the tests so
far with flying colours, including 40m RX. Now I have just completed the
transmitter stages, and attempted the first tx test... Ah problems. Well
things have gone well so far!! Even a bottle of Hoegaarden did not help...
This is what happens.

1.40m rx working fine.
2. Connect dummy load etc
3. Set for 2.0 output, tune to 7100
4. Press and hold tune.

A bleep in the headphones, the output limiter on the PSU flicks in cutting
the power briefly and Elecraft displays on the K2. (I have tried another PSU
(3amp) but the same result)  If the power is turned down to .2 or so it will
stay in tune mode

Upon checking the antenna connection, there appears to be a short between
earth and the centre of the BNC.. (Using a DVM) This cannot be correct?

I have tried another PSU (3amp) but the same result.

Perhaps you could confirm if an indicated short across the BNC, is
incorrect, and any suggestions of where to look first would be very helpful.

Thanks!!!!!

Regards
Nicolas
www.m1hog.com

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[Don Brown-4]

Hi

It is normal to read a very low DC resistance on the BNC center pin to ground. I would look for bad connections on the toroids in the transmitter and make sure T4 is wound right and connected right. Also check that Q2 is in right and all of the 1n4007 diodes are in right

Don Brown


  ----- Original Message -----
  From: Nicolas Pike<mailto:[hidden email]>
  To: [hidden email]<mailto:[hidden email]>
  Sent: Friday, July 09, 2004 6:40 PM
  Subject: [Elecraft] RE: K2 4039, Failing transmitter tests


  Hi,

  I have steadily and carefully built my K2 and it has passed all the tests so
  far with flying colours, including 40m RX. Now I have just completed the
  transmitter stages, and attempted the first tx test... Ah problems. Well
  things have gone well so far!! Even a bottle of Hoegaarden did not help...
  This is what happens.

  1.40m rx working fine.
  2. Connect dummy load etc
  3. Set for 2.0 output, tune to 7100
  4. Press and hold tune.

  A bleep in the headphones, the output limiter on the PSU flicks in cutting
  the power briefly and Elecraft displays on the K2. (I have tried another PSU
  (3amp) but the same result)  If the power is turned down to .2 or so it will
  stay in tune mode

  Upon checking the antenna connection, there appears to be a short between
  earth and the centre of the BNC.. (Using a DVM) This cannot be correct?

  I have tried another PSU (3amp) but the same result.

  Perhaps you could confirm if an indicated short across the BNC, is
  incorrect, and any suggestions of where to look first would be very helpful.

  Thanks!!!!!

  Regards
  Nicolas
  www.m1hog.com<http://www.m1hog.com/>

  ---
  Outgoing mail is certified Virus Free.
  Checked by AVG anti-virus system (http://www.grisoft.com<http://www.grisoft.com/>).
  Version: 6.0.716 / Virus Database: 472 - Release Date: 05/07/2004


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  Elecraft mailing list
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  Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft<http://mailman.qth.net/mailman/listinfo/elecraft>    Help:  http://mailman.qth.net/subscribers.htm<http://mailman.qth.net/subscribershtm>
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_______________________________________________
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Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft    Help:  http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com