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 Post subject: Heathkit SP600/HP 23A power supply
PostPosted: Mar Mon 05, 2018 10:17 pm 
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Location: Dallastown PA 17313
I have this Heathkit & the power supply. Never having a Heathkit before I have a question concerning the PS & connecting cable. Brought the PS up on the variac.
Is the cable ( PS end ) pin 1 suppose to be connected to pin 1 on the cables radio end ? Does each pin have continuity to the corresponding PIN number on the other end ? My cable doesn’t. So I’m not sure if I have the right cable ?? I don’t want to take a chance & damage the radio . By the picture here , it may be an unusual Heathkit .
Thanks
Mike


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 Post subject: Re: Heathkit SP600/HP 23A power supply
PostPosted: Mar Mon 05, 2018 10:40 pm 
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I believe ebaman has the manual for the SB-102, if not grab the SB-101 from them.

Pins 5, 8, and 11 do NOT go straight through. On the transceiver end 5 and 11 can be used to connect to an external amplifier control relay and are NOT connected at the power supply, pin 8 is not used and it is the 6 volt AC output on the power supply end. The HP-23 series was designed to work with a variety of rigs so it supplies a 6 volt output not needed for most of the Heathkit rigs and a adjustable bias which is used for some rigs but most of the Heathkit line uses the fixed bias output with adjustment done in the transceiver.

A SB-103 may have been a prototype, one would presume on the way to solid state but there never was a production SB-103 and the series skipped from the SB-102 to the very different all solid state SB-104. It could also reflect someone's humor at aftermarket modifications done by the owner.

Don't try hooking it up until you review the SB-102 manual setup and follow the steps in it. Smoky bad things can easily happen otherwise.

Rodger WQ9E


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 Post subject: Re: Heathkit SP600/HP 23A power supply
PostPosted: Mar Mon 05, 2018 11:16 pm 
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Thanks for the info on the cable pins. If someone did this 103 label as a hoax, they did a dang good job.

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 Post subject: Re: Heathkit SP600/HP 23A power supply
PostPosted: Mar Mon 05, 2018 11:27 pm 
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Post a photo of the inside if you could.

Randy Kaeding K8TMK wrote a series for Electric Radio in 1996 with the title "Heathkits that Weren't" about designs that never made it to market. If he is still around he might have information about a SB-103 but I suspect like the solid state version of the SB-401 (that would match the SB-303) it never made it past the thought stage. Tastes and technology changed too rapidly and the SB-104 and similar put an end to the old school Heathkit designs although the incredibly popular HW-101 continued to soldier on for a time.

Rodger WQ9E


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 Post subject: Re: Heathkit SP600/HP 23A power supply
PostPosted: Mar Tue 06, 2018 12:10 am 
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From the Wikipedia (so it must be right :-) ) article on Heathkit:

"some hams who worked at Heath hinted that there was talk of a solid state SB-103 transceiver, but it never made it past the proposal stage."

There is no citation for this in the article; however, seems likely that the SB-103 label was some ham humor.

- Bruce K1FFX


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 Post subject: Re: Heathkit SP600/HP 23A power supply
PostPosted: Mar Tue 06, 2018 12:57 am 
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I think I have the right cable,
PS end Pins: Radio End Pins:
1-green. / 11
2-black. / 10
3-orange. / 9
4-yellow. / 8
6-red. / 6
7-pale yellow. / 5
9-small black. / 3
10-blue. / 2
PS end 5,8,11 empty. Radio end,1,4,7 empty
I just had a very interesting talk with the new Heathkit company. They can't say it's a SB 103 but " it is a unusual radio "
They're saying a 102 but the SB 103 label looks factory . Looks similar to a SB 101 chassis from what I can see. Well I think I'll look at schematics again they decide if I'm going to power it up !! I'll post a chassis picture soon as I resize it.

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 Post subject: Re: Heathkit SP600/HP 23A power supply
PostPosted: Mar Tue 06, 2018 6:35 am 
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Location: Vancouver, BC
>I think I have the right cable,
>PS end Pins: Radio End Pins:
>1-green. / 11
>2-black. / 10
>3-orange. / 9
>4-yellow. / 8
>6-red. / 6
>7-pale yellow. / 5
>9-small black. / 3
>10-blue. / 2
>PS end 5,8,11 empty. Radio end,1,4,7 empty

I'd guess that you are mis-reading one end of the cable - probably the female end. Easy enough to do.
The original intent was 1-1, 2-2, 3-3, etc., and I think that's what you have.

VE7XF


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 Post subject: Re: Heathkit SP600/HP 23A power supply
PostPosted: Mar Tue 06, 2018 1:32 pm 
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Never having a Heathkit I’m not sure how to read the orientation of the female end , I was reading it clock wise as looking at the holes. Male pins are numbered and read clockwise. Uhm !!
Thanks

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 Post subject: Re: Heathkit SP600/HP 23A power supply
PostPosted: Mar Wed 07, 2018 12:29 am 
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>Never having a Heathkit I’m not sure how to read the orientation of the female end ,
>I was reading it clock wise as looking at the holes. Male pins are numbered and read clockwise.

Backwards.
Try this: Look at the holes on the socket.
Point the keyway towards you.
Start at the hole that's at 5:00 (#1) and count counter-clockwise.
You'll probly find that the cable you have is properly wired.
Not to worry - I have to double-check myself when connecting my cables.

VE7XF


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 Post subject: Re: Heathkit SP600/HP 23A power supply
PostPosted: Mar Wed 07, 2018 9:47 pm 
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Joined: Jan Sun 13, 2013 2:46 pm
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Location: Dallastown PA 17313
Brought the Heathkit up on the variac today. Tubes were glowing , dial lights lite. Started to hear static but no stations. Uhm ? Turned around and noticed the coax switch was in wrong position. Duh ! . Switched it & started pulling in 40m CW & SSB stations . I’m happy now .
Thanks for setting me straight on the cable.
Mike

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