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Author Topic: Harvey Wells TBS-50 T/R Switching Question  (Read 3779 times)
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W1UJR
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« on: May 29, 2006, 06:41:41 PM »
Maybe I have overlooked something, but how does one go about switching a 110VAC Dow-Key off this transmitter?
I can't seem to find a switched series of terminals on the unit.
Am I looking at the wrong schematic, or is there another simpler means?

Tnx - Bruce W1UJR
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ve6pg
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« Reply #1 on: May 30, 2006, 01:02:41 AM »
...BRUCE,TIM HERE IN TORONTO....SEND AN EMAIL TO CHRIS, 
va3nth@sympatico.ca
...HE'S WERKING ON ONE,AND HAS 2 AS A MATTER OF FACT....TIM....SK..
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...Yes, my name is Tim Smith...sk..
Pete, WA2CWA
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« Reply #2 on: May 30, 2006, 02:39:46 PM »
Page 24 and page 25 of the manual gives tips and circuit info for push-to-talk operation. Also Bulletin #10 has info on PTT. AC switching is not recommended.
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Pete, WA2CWA - "A Cluttered Desk is a Sign of Genius"
W1UJR
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« Reply #3 on: May 30, 2006, 05:33:06 PM »
Quote from: Pete, WA2CWA on May 30, 2006, 02:39:46 PM
Page 24 and page 25 of the manual gives tips and circuit info for push-to-talk operation. Also Bulletin #10 has info on PTT. AC switching is not recommended.

So is it suggested to use a low voltage DC relay?
Guess I could use a DC relay to run the Dow-Key.

Tnx - Bruce
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Pete, WA2CWA
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« Reply #4 on: May 30, 2006, 05:42:44 PM »
Quote from: W1UJR on May 30, 2006, 05:33:06 PM
Quote from: Pete, WA2CWA on May 30, 2006, 02:39:46 PM
Page 24 and page 25 of the manual gives tips and circuit info for push-to-talk operation. Also Bulletin #10 has info on PTT. AC switching is not recommended.

So is it suggested to use a low voltage DC relay?
Guess I could use a DC relay to run the Dow-Key.

Tnx - Bruce

Bruce:
Why don't you just go to the BAMA site and get the manual. It sounds like you don't have it. I didn't spend a lot of time reading the text when I looked at it. You could also use electronic T/R switching. One tube, adds a little gain for the receiver, voltage derieved from the power supply, noiseless. Ye old knife switch also works great if you're into manual.
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Pete, WA2CWA - "A Cluttered Desk is a Sign of Genius"
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