MLU FORUM  

Go Back   MLU FORUM > GENERAL WW2 TOPICS > The Wireless Forum

Notices

Reply
 
Thread Tools Display Modes
  #1  
Old 14-02-21, 02:47
Robert Bergeron's Avatar
Robert Bergeron Robert Bergeron is offline
Registered User
 
Join Date: Nov 2012
Location: East Central Canada
Posts: 1,593
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 .
__________________
44 GPW 44 C-15-A Cab 13 Wireless 5 with 2K1 box
44 U.C. No-2 MKII*
10 Cwt Cdn Brantford Coach & Body trailers
94 LSVW
Reply With Quote
  #2  
Old 14-02-21, 19:30
Bruce MacMillan Bruce MacMillan is offline
a Canuck/Brit in Blighty
 
Join Date: Jul 2004
Location: Hell Fire Corner, Kent UK
Posts: 633
Default

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.
Reply With Quote
  #3  
Old 14-02-21, 20:51
Robert Bergeron's Avatar
Robert Bergeron Robert Bergeron is offline
Registered User
 
Join Date: Nov 2012
Location: East Central Canada
Posts: 1,593
Default

Thanks Bruce . 100 Ohms . That’s all my radio / tv tech will need to know to make my snatch plug . Very useful info .
__________________
44 GPW 44 C-15-A Cab 13 Wireless 5 with 2K1 box
44 U.C. No-2 MKII*
10 Cwt Cdn Brantford Coach & Body trailers
94 LSVW
Reply With Quote
  #4  
Old 24-02-21, 08:00
Bruce MacMillan Bruce MacMillan is offline
a Canuck/Brit in Blighty
 
Join Date: Jul 2004
Location: Hell Fire Corner, Kent UK
Posts: 633
Default

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.
Reply With Quote
  #5  
Old 25-02-21, 16:34
CWO (ret) Gilles Aubé's Avatar
CWO (ret) Gilles Aubé CWO (ret) Gilles Aubé is offline
Registered User
 
Join Date: Mar 2008
Location: Laval, Québec, Canada
Posts: 204
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
Reply With Quote
  #6  
Old 27-02-21, 13:59
Robert Bergeron's Avatar
Robert Bergeron Robert Bergeron is offline
Registered User
 
Join Date: Nov 2012
Location: East Central Canada
Posts: 1,593
Default

Thank you Chief Aubé .
__________________
44 GPW 44 C-15-A Cab 13 Wireless 5 with 2K1 box
44 U.C. No-2 MKII*
10 Cwt Cdn Brantford Coach & Body trailers
94 LSVW
Reply With Quote
  #7  
Old 27-02-21, 21:35
Chris Suslowicz Chris Suslowicz is offline
Junior Password Gnome
 
Join Date: May 2007
Location: England
Posts: 713
Default

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.
Reply With Quote
  #8  
Old 06-05-21, 03:04
Robert Bergeron's Avatar
Robert Bergeron Robert Bergeron is offline
Registered User
 
Join Date: Nov 2012
Location: East Central Canada
Posts: 1,593
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 .
Attached Thumbnails
3CFFA710-AEEF-4504-A613-8F75FF10028A.jpeg  
__________________
44 GPW 44 C-15-A Cab 13 Wireless 5 with 2K1 box
44 U.C. No-2 MKII*
10 Cwt Cdn Brantford Coach & Body trailers
94 LSVW

Last edited by Robert Bergeron; 06-05-21 at 03:49.
Reply With Quote
  #9  
Old 08-05-21, 03:03
Robert Bergeron's Avatar
Robert Bergeron Robert Bergeron is offline
Registered User
 
Join Date: Nov 2012
Location: East Central Canada
Posts: 1,593
Default

How about i connected the speaker to a remote hence the remote to the snatch plug on the control box of the wireless set ?
__________________
44 GPW 44 C-15-A Cab 13 Wireless 5 with 2K1 box
44 U.C. No-2 MKII*
10 Cwt Cdn Brantford Coach & Body trailers
94 LSVW
Reply With Quote
  #10  
Old 14-05-21, 04:29
Robert Bergeron's Avatar
Robert Bergeron Robert Bergeron is offline
Registered User
 
Join Date: Nov 2012
Location: East Central Canada
Posts: 1,593
Default

Interesting second paragraph . What does it mean ?
Attached Thumbnails
547FDB5C-DDC3-477B-AF8F-E7A019D63F67.jpeg  
__________________
44 GPW 44 C-15-A Cab 13 Wireless 5 with 2K1 box
44 U.C. No-2 MKII*
10 Cwt Cdn Brantford Coach & Body trailers
94 LSVW
Reply With Quote
  #11  
Old 14-05-21, 12:15
Chris Suslowicz Chris Suslowicz is offline
Junior Password Gnome
 
Join Date: May 2007
Location: England
Posts: 713
Default

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.
Reply With Quote
  #12  
Old 14-05-21, 15:41
Bruce MacMillan Bruce MacMillan is offline
a Canuck/Brit in Blighty
 
Join Date: Jul 2004
Location: Hell Fire Corner, Kent UK
Posts: 633
Default

apparently it was something that was done but not an official mod.
Attached Thumbnails
ws19speaker2.jpg  
Reply With Quote
  #13  
Old 14-05-21, 16:46
Chris Suslowicz Chris Suslowicz is offline
Junior Password Gnome
 
Join Date: May 2007
Location: England
Posts: 713
Default

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.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT +2. The time now is 11:20.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.
Copyright © Maple Leaf Up, 2003-2016