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  #1  
Old 14-02-21, 02:47
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Robert Bergeron Robert Bergeron is offline
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Default speaker connected to No 19 set

Gents , is there a way to connect a speaker to the WS no 19 set in place of headsets ? The idea is to show visitors real radio traffic without having to hand over a set of headsets and microphone .
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  #2  
Old 14-02-21, 19:30
Bruce MacMillan Bruce MacMillan is offline
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quite a few people have used a speaker either connected directly to pin 4 of PL2A or through a control box. The thing is the audio output impedance of the 19 set is 100 ohms. Most speakers are around 3-8 ohms. This mismatch will result in low audio. You can use an audio matching transformer to match your speaker impedance. Connecting it to a 19 set snatch plug means you don't have to modify the set. It looks like you have a #3 control box so should have a spare drop. Canada actually had a need for a speaker and had a quote from Pye but never followed through.
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Old 14-02-21, 20:51
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Thanks Bruce . 100 Ohms . That’s all my radio / tv tech will need to know to make my snatch plug . Very useful info .
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Old 24-02-21, 08:00
Bruce MacMillan Bruce MacMillan is offline
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researching for another user on another website I came up with a Hammond 144B transformer. This is 200 ohm center tapped to 3.2 ohm. Using 1/2 of the primary you'll have a perfect match. You can try Electrosonic or Mouser, etc to source the part.
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Old 25-02-21, 16:34
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CWO (ret) Gilles Aubé CWO (ret) Gilles Aubé is offline
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Default speaker connected to No 19 set

Mon col, in my time with the 19th set we used a speaker from the Tanoids
set from the gun and it worked perfectelly.
BON tir.
Gilles
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  #6  
Old 27-02-21, 13:59
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Thank you Chief Aubé .
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Old 27-02-21, 21:35
Chris Suslowicz Chris Suslowicz is offline
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I think the Tannoy 'gun control loudspeaker' is probably a good solution, and if you need a volume control look at the Control Unit 190 as used on the Sexton for how that was set up. (I think I've got this right.)

Chris.
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Old 06-05-21, 03:04
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Default Tannoy speaker

OK friends , i have this now . How do i connect it to the No 19 set as a speaker ? The simpler the solution the better . Notice the lower buttons ( phone wire connection ? ) are identified as connecting to the No 19 . The upper ones are identified as «*line*» . How about if i connected it to a remote then connect the remote to the set with the snatch plug ? Will that work ? Thanks .
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Last edited by Robert Bergeron; 06-05-21 at 03:49.
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Old 08-05-21, 03:03
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How about i connected the speaker to a remote hence the remote to the snatch plug on the control box of the wireless set ?
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  #10  
Old 14-05-21, 04:29
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Interesting second paragraph . What does it mean ?
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  #11  
Old 14-05-21, 12:15
Chris Suslowicz Chris Suslowicz is offline
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Quote:
Originally Posted by Robert Bergeron View Post
Interesting second paragraph . What does it mean ?
It means they used the intercom amplifier to drive the loudspeaker once they were set-up in position. (More power available than from the 'A' set audio output stage.)

You should be able to drive that at a reasonable level from the 'A' set, just use about a 70 ohm resistor in series with one of the loudspeaker terminals and connect it to the 'phones' output in a droplead or the terminal block in the control unit. Add more series resistance if too loud, reduce if not loud enough, but 70 should be enough to keep the 'A' set safe from overload.

I'll give it some more thought later. (There may be diagrams!)

Chris.
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  #12  
Old 14-05-21, 15:41
Bruce MacMillan Bruce MacMillan is offline
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apparently it was something that was done but not an official mod.
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  #13  
Old 14-05-21, 16:46
Chris Suslowicz Chris Suslowicz is offline
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That may well be the origin of Control Unit 190.

UK War Office saying "Nothing official exists, local bodges only." and Canada thinking "OK, there's a need for this, let's do it properly".



Chris.
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