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-   -   Wireless of the Week - week 37 (http://www.mapleleafup.net/forums/showthread.php?t=26511)

Bruce Parker 28-10-16 00:45

Wireless of the Week - week 37
 
5 Attachment(s)
Developed in 1941, the Switchboard, Charging No.5 was an attempt to standardize and simplify charging batteries that were required to operate wireless sets. Up to that time, charging panels had been unique to a particular radio or wireless installation, but with the 19 and 22 sets then in use, pairs of 6 volt batteries in series were a common power supply with one pair operating the set while the other was being charged by a gasoline generator.

No. 5 Switchboards were most often seen in wireless trucks even if that truck had a factory supplied panel. This was not only to standardize, but in many instances the existing vehicle system was insufficient to operate the more modern wireless equipment and batteries. Also, the No.5 Switchboard could be removed and used from a remote location such as a penthouse or trench if required.

The unit was 18-1/2” wide by 11-1/4” tall by 5” deep and consisted of four ceramic ‘stove’ switches with porcelain knobs set in a bakelite panel. The switch knobs only turned clockwise (lifting and turning counter clockwise removed them) and each switch was protected by a plastic cover. The top left switch determined which pair of batteries supplied the wireless set, the top right controlled ‘internal lighting’ and the two lower ones were to select which generator charged which pair of batteries. Terminal posts running down either side were supplied to attach two pairs of batteries, two generators and output for ‘internal lighting’ which could also be used as a generic 12V DC supply for anything that required it. Two additional posts in the centre were the positive and negative 12 volt output for the wireless set. The bakelite front panel was secured to two wooden battens that were also the mounting points, and the battens to a plywood backing panel. The space between the front and back panels was open so the switchboard was not waterproof.

Shown here is a British ‘Switchboard Charging No.5’ and a ‘Switchboard, Charging No.C5 Canadian’. Note the larger switches and scalloped knobs on the British board. A modified Canadian unit with additional terminal posts was also made for use with the No.19 Amplified wireless set. Noted also is that the British panel used vinyl coated solid core copper wiring which must be one of its earlier uses.

Photograph 4 shows the mounting brackets for the switchboard and in the 5th a diagram from the 52 set manual that shows how it is connected.

Robert Bergeron 29-10-16 01:24

Thank you Bruce, very clear and informative info.Cheers. Bob

David Dunlop 15-10-21 00:48

Did RCA Canada ever publish a manual for the Switchboards, Charging, No. 5C Cdn?

As Bruce noted, brief installation or operational references to this item show up in a number of Wireless Manuals, but was all of this ever consolidated into one publication issued with the Switchboards?

David

Jordan Baker 15-10-21 02:37

Quote:

Originally Posted by David Dunlop (Post 282509)
Did RCA Canada ever publish a manual for the Switchboards, Charging, No. 5C Cdn?

As Bruce noted, brief installation or operational references to this item show up in a number of Wireless Manuals, but was all of this ever consolidated into one publication issued with the Switchboards?

David


I’ve never come across one. I do find this charging board is pretty intuitive in its use and hook up with everything cleanly labeled.

David Dunlop 15-10-21 04:01

Thanks, Jordan.

They do look very straight forward. Finding one is on my B-List for the 52-Set Project eventually.

David

Bruce Parker 15-10-21 04:16

Quote:

Originally Posted by David Dunlop (Post 282518)
Thanks, Jordan.

They do look very straight forward. Finding one is on my B-List for the 52-Set Project eventually.

David

It's not like the army to not produce a manual, even for the simplest of things. But I agree with Jordan, I have never seen one. It is spoken to in several radio manuals and installation instructions so maybe that's it.

An interesting sidebar. My British panel is a restoration. It had spent its post-war life in the UK at a carnival where it operated the amusement lights and power to the rides which was apparently a common use for them there. Here in Canada they just don't seem to have survived in any quantity.

David Dunlop 15-10-21 15:28

The only place in Canada I ever saw them for sale was Electronic Surplus in Parry Sound back in the late 70’s. I still have one of their catalogs somewhere.

One of the mysteries in their catalog was a canvas bag of cable clamps for ‘the Fox’. Had no clue what that was in those days.

David


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