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Author Topic: Heathkit HP-23 power supply problem  (Read 1896 times)
KD5HQN
Member

Posts: 32




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« on: July 14, 2004, 03:40:43 PM »

Hey All,

I have a Heathkit SB-100 tranceiver and matching HP-23 power supply.  I suspect the transformer in the power supply may have a problem.  Is there any way to check the transformer and where would I get a replacement if it is bad?

Any help or comments would be greatly appreciated

Thanks, and 73's

Jeremy
KD5HQN
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WB2WIK
Member

Posts: 20595




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« Reply #1 on: July 14, 2004, 05:38:48 PM »

Disconnect all the loads, energize the primary and measure AC voltage across each secondary winding; confirm if they are correct according to the Heath manual/schematic.  See if there is a voltage indication from any winding to the transformer case with the primary energized (there shouldn't be).  See if the transformer gets hot with no load connected to it, but the primary energized (it shouldn't).

That's about it.

Doesn't Harbach sell replacement HP-23 transformers?  I'd have to go look....

WB2WIK/6

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KZ1X
Member

Posts: 3228




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« Reply #2 on: July 28, 2004, 06:53:39 PM »

Did you see the HP-23 rebuild kit/project in a recent QST?  Nice!

HP-23 series transformers almost NEVER fail.  But the other parts, notably the electrolytic caps, etc., "time out" after 20-30 years or so ... and most of these power supplies have more than reached their Zenith.

That last line was an inside "pun" joke.  Those of you who got it, I hear you chuckling.
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KD5HQN
Member

Posts: 32




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« Reply #3 on: July 29, 2004, 12:27:40 PM »

I'm not an ARRL member, so no, I didn't see that article.  Is there any way you could get me a copy of the article?  if you can email me directly and we can arrange how to get it to me.

thanks for all your help everyone, any other comments would be appreciated.

thanks and 73's
KD5HQN
Jeremy Bakke
Pryor, OK
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WA4NJY
Member

Posts: 109




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« Reply #4 on: July 31, 2004, 09:31:25 PM »



          Jeremy,
                  If the transformer checks OK, try
    the Heathkitshop they make a replacement rectifier
    and filter board kit. Also, it is true the trans-
    former rarely goes bad.

              good luck and keep us posted,
                                Ed
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KD5HQN
Member

Posts: 32




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« Reply #5 on: August 02, 2004, 12:37:07 PM »

I haven't had a chance to check the transformer yet, but as soon as I get that done, I'll post my resuslts and let you guys know how it's going.

thanks for all your help.

73's
KD5HQN
Jeremy Bakke
Pryor, OK
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KD5HQN
Member

Posts: 32




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« Reply #6 on: August 10, 2004, 09:38:44 PM »

Hey All, the Transformer is fine, and the radio works great.  It turned out I had to manually reset the circuit breaker/reset switch.(I.E. open up the little metal box and phyisically reset the switch.)  Works great, using a long wire antenna(approx. 60 ft right now) to recieve, not transmitting as I haven't upgraded yet.

thanks for all your Help!!

73's
KD5HQN
Jeremy Bakke
Pryor, Ok.
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W9GB
Member

Posts: 2623




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« Reply #7 on: August 23, 2004, 09:59:21 PM »

Jeremy -

The HP-23R QST article was written by Mike Bryce, WB8VGE at the The Heathkit Shop.
http://www.theheathkitshop.com/hp23r.html

Do a few Google searches on Heathkit and the "SB" series and you will find hindreds of resource people for Heath equipment.
http://members.aol.com/wwheco1/heco_fix.htm

Greg
w9gb

HW-101 history
http://www.elinkusa.com/hw-101/HISTORY.htm

SB collection
http://www.heathkit.ca/sb%20series.html
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