Re: scr522-bc624

nierveze wrote:
Litzendraht wrote:

I have the book on the SCR 522, but no way to scan and forward
schematics.

Do you have a specific question about the receiver? I am familiar with
the equipment. I used the BC 624 and 625 almost 45 years ago as my two
meter AM station.

John

Hello ,thanks for your answer.I have no precise question,I have bought one on ebay ,it is electronically complete ,and without problem (maybe the chemical condensers to change),and mecanically the mecanism of tuning has been removed ,but not the variable condensers and coils.
I plan to do use it to do radio-astronomy ,yes it may seem a fool project ,but one part of my hobby besides radio-amateur is radio-astronomy ,and I wanted to use a receiver like they were at
the beginning of radio-astronomy on vhf just to know what was received from the sun at that time .This is why I'd like to have the schematic with values of resistors ,condensers etc,and the
connectors ,so I can use it and repair it .
Thanks very much,best 73 alain f1gqb

G'Day Alain

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.

73
Lionel L Sharp, VK4NS
.

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