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scr522-bc624
hello everyone,I need the schematic of the receiver part
of the scr522 ,I have found one schematic on the internet but it is almost impossible to read.Thanks very much ,73 f1gqb |
scr522-bc624
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 |
scr522-bc624
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 |
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 |
scr522-bc624
nierveze wrote:
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 Good luck with the project. I also used a 522 on 2 meters. As I recall, they were OK in their day, but pretty insensitive by today's standards. On the other hand, the sun is a pretty powerful transmitter! ;-) Have you tried copying Jupiter? It's around 21 MHz; nice web site about it. Do a web search for "Project Jove". 73, Carter K8VT |
scr522-bc624
nierveze wrote: 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 Alain, You might ask some of the older members of your local radio amateur community for information and drawings of the 522. It was a very popular set amongst hams in the post War years. I am surprised that you will be attempting radio-astronomy work with the BC 624. As someone mentioned, it is not a very sensitive receiver. Most amateurs that used it began by rebuilding the front end for lower noise and higher gain. One chap mentioned substituting 6AG5 tubes for the 9003's. I used 6AK5's. It is a 4 channel crystal controlled unit and perhaps for your purpose, just a few channels may be acceptable.There are some simple changes that will allow it to be continuously tunable from 100 to 156 Mhz without having to use quartz crystals. I'm sorry that I do not have ability to scan and forward information. It might be of interest, when I was in the military, one of our search radars operated in the "S" band (around 3000 Mhz), and I found if I raised the antenna elevation and aimed towards the sun there was a most dramatic increase in receiver noise. Good luck with your project. John |
scr522-bc624
wrote:
hello everyone,I need the schematic of the receiver part of the scr522 ,I have found one schematic on the internet but it is almost impossible to read.Thanks very much ,73 f1gqb Hi Alain, just send the schematic you need @ your email address. Far from pefect scan in two parts, the original is large. Hope it will help, with scissors and adhesive tape I think it can. Feddback welcome, other request of this schematic also. Schéma envoyé directement à votre adresse mail.... Etc! Thierry Stora http://www.chapelon.net |
scr522-bc624
|
scr522-bc624
wrote: Hi Alain, just send the schematic you need @ your email address. Far from pefect scan in two parts, the original is large. Hope it will help, with scissors and adhesive tape I think it can. Feddback welcome, other request of this schematic also. Schéma envoyé directement à votre adresse mail.... Etc! Thierry Stora http://www.chapelon.net Thank you Thierry for sending the schematic to Alain. I wish Alain well in his radio astronomy ventures with 60 year old radio equipment. John |
scr522-bc624
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 |
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