Litzendraht wrote:
Lionel Sharp wrote:

Ah memories - I used an SCR522 Rx & Tx on 2 metres way way back. They
were a great piece of gear and used by lots of hams.

Before you apply power to the receiver (or transmitter) check out the
.006mf mica HT bypass capacitors. Some of the sets used Micamold
capacitors which are dark brown in colour and are in fact paper not
mica. They used to break down with monotonous regularity.

Best to replace the lot (15 or so)in the receiver (and Tx). Some
SCR522's had good mica capacitors and if I remember they were light
brown in colour.

There were a couple of versions of the receiver that I know of. One
version had a squelch relay whilst the other version had electronic squelch.

I do have a manual but to copy the circuit it would be in 3 pieces and I
dont know how the small print would come out.Also have the wiring diagram.

There is a relative simple modification to make the RX tunable and not
crystal controled

You should be able to get a circuit locally if you hunt around, if not
let me know and will try sending you a copy.




Lionel,

Why don't we create an SCR 522 fan club? I eventually replaced the
832 PA with an 829B and ran about 70 watts, modulated with a pair of
1625's on two metres AM. Golly, those were my "wonder years". I was
still a kid in high school. I still have some 522 stuff about, but no
complete units. I do recall that all the equipment tags have the RAF
insignia.

John

G'Day John
I am sure that many of those who used the SCR522 in the past have passed
on. When I used my SCR522 on 2 metres there was no TV and consequently
no TVI. I think that TV changed all that. Even had one that was
converted to 6 metres (the TX not RX).

There was a rather large mains power supply, the RA62 produced in the
USA for the military.

The RAAF (Royal Australian Air Force) also had mains power supply made
under contract and they are heeeavy.

The RAF and RAAF designations was the TR5043.

I believe it was descended from the RAF TR1143 VHF set which was used
very successfully in the early days of WW2 for fighter control. When the
Americans saw the successful use of VHF they took a TR1143 back to the
USA and "Copied" it and produced it as the SCR522.

Only ever saw one TR1143 in a surplus shop. I think that the TR1143
would be very rare nowadays.

Someone will correct me if I am wrong about this.

73
Lionel L Sharp, VK4NS