MLU FORUM  

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

Notices

Reply
 
Thread Tools Display Modes
  #1  
Old 20-01-17, 00:19
Bruce Parker (RIP) Bruce Parker (RIP) is offline
GM Fox I
 
Join Date: Feb 2003
Location: SW Ontario, Canada
Posts: 2,606
Default Wireless of the Week - week 49

This week’s items qualify as the most boring so far, yet they are a vital part of both line and wireless communication systems. Grounding sets to eliminate static interference or grounding line equipment to maximize its performance was necessary and a precaution every good signaller became proficient in.

The small spike, shown here in its fitting on a ’37 Pattern web brace was used to ground field phones, Fullerphones and remote control units. The web brace was most often the carrying strap for the unit. While it could be used to ground the unit for its own sake, generally this spike was used as a ground when signalling over one wire. You may recall in previous weeks that line equipment could be used with two wires connecting the sets, or a single one with the second wire going to ‘earth’. The spike shown is used for this purpose. It is made of steel and is 13” long weighing 1-1/2 lbs. The captive knurled nut is for the wire connection and the L-shaped handle at the top is for depressing the spike into the ground by hand. This Canadian example was made by MCA (I’m not sure who that is) in 1942.

The large spike is used for grounding wireless trucks and vans against static buildup or interference from the vehicle’s electrical system, however wireless trucks also employed suppression systems for their ignitions and were well bonded with woven metal ground straps between frame, engine and body components. The spike is 36” long made out of 1-5/16” diameter bronze tube weighing 6-3/4 lbs. It has a reinforced point and head for pounding into the ground. The black band indicated the depth to which the spike was to be set. A rubber coated wire was used to attach the top of the spike to a grounding point on the vehicle. Often when there was no ability to sink the spike because of rock, or for operating when stopped for short durations, the spike was grounded by placing it wedged under the vehicle’s tire as shown. This spike is again is a Canadian MCA made example dated 1942.

The last photo is of the factory applied “W/T” stencil painted on vehicles to indicate they were equipped to take a wireless set. This typically meant not only provision for the wireless set carrier and aerial brackets but also that it had ignition suppression and grounding against radio interference. It is 4-3/4” wide with 2” tall white letters.
Attached Thumbnails
1.jpg   2.jpg   3.jpg   4.jpg   5.jpg  

Reply With Quote
  #2  
Old 12-02-17, 09:08
wendel daniel wendel daniel is offline
Registered User
 
Join Date: Aug 2016
Location: france, lorraine
Posts: 139
Default

hello
i have this two in my collection, but no marking on them.
regards
daniel from france

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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Wireless of the Week - week 20 Bruce Parker (RIP) The Wireless Forum 5 16-08-20 17:16
Wireless of the Week - week 48 Bruce Parker (RIP) The Wireless Forum 0 13-01-17 00:06
Wireless of the Week - week 21 Bruce Parker (RIP) The Wireless Forum 3 16-07-16 20:47
Wireless of the Week - week 17 Bruce Parker (RIP) The Wireless Forum 10 22-06-16 06:48
Wireless of the Week - week 18 Bruce Parker (RIP) The Wireless Forum 0 17-06-16 00:28


All times are GMT +2. The time now is 20:06.


Powered by vBulletin® Version 3.8.4
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.
Copyright © Maple Leaf Up, 2003-2016