Post war 120volts to 12/24 power supply.

[Bob Carriere]

I started my Winter project with the 19 set by first making sure the power supplies would at least work.

Well the first one did.... the outside is dented, splattered with paint drippings but works like a charm.

The second one, the clean one with the canvass cover, is dead as a door knob. Preliminary testing "seems" to indicate a faulty main power switch......if that is all it needs I will be lucky.

But before I dive any deeper...... the two power supplys are of different construction.... outside is the same but the guts are slightly different.

Now for my questions....

Are there any wiring diagrams/schematics.....or manuals available to guide me along this route..... there maybe more than one model....

Thanks for your help.

Bob C.

[Mike Kelly]

Hi

There are different power supplies . The Mk 2 sets had a large single rotary transformer that ran both the transmitter and receiver , this was not a efficient method as it drained the battery .

To save battery power, the Mk 3 power supply had two smaller separate rotary transformers , one above the other . In receive mode only , the smaller transformer was on .

In the case of the Canadian Mk3 they used a vibrator unit to power the receiver on the set .

I guess you know of the 19 set web site ?

Mike

[Bruce MacMillan]

Bob, can you post a photo. There was no 120v to 12/24v power supply for the 19 set per se.

Are you talking about the CPP-2 made for the C42 & other Larkspur stuff? Big green box, VERY heavy.

[Edwin Wand]

In the 1950's we used a 120v power supply/converter for the 19 sets in Canada. Cant remember the model no or manufacturer but as noted it was very heavy. Mounted on a wooden base it took one man on each side to carry it. Others with direct RC Sigs experience could probably help out with more detail. Ours were painted OD and were about 18 "x12"x12". In the field we used 2 six volt and later 1 12v batteries.
Our 19 sets were replaced by the 510 and 26 set about the mid 50's, with the exhausted 26 set batteries being used to power razors

[Bob Carriere]

Sorry for being unclear I am talking about the CCP - 2 power sypply with a knife switch to give 12 or 24 volts.....actually more like 14.6v and 28.7 v.

The other 110 v power supply for the 19 set that fits on the board will be examined later...

Will post pictures later today....... both date stamped 1952.

Will attempt to cannibalize a double pole single throw switch from an old NRC research panel of the late 50s.... the original switch has screwed on terminals while the salvaged switch had soldered terminal..... trying to keep it original as possible...... and screwed in terminals are so much easier to service later.

Mike...... can you post the 19 set site.... thanks.


Bob C

[Mike Kelly]

Originally Posted by Bob Carriere

Mike...... can you post the 19 set site.... thanks.


Bob C

sure

http://www.qsl.net/ve3bdb/