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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 |
scr522-bc624
Litzendraht wrote:
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 Hello every one ,thanks for your precious help, thanks Thierry for the schematics well arrived at home and well printed ,time will be long now the bc624 come from Honolulu....yesterday I went to my garage and got the bc 625 (transmitter) I already have ,it is in nice condition.The reason I plan to use the bc624 in radio-astronomy is simple :it is a radio-set I found on ebay at a reasonable price (shipping included ) (before ,I had looked at hamfests in France ,and did not find receivers in vhf old enought-1960 was the oldest),I am a long time om ,and doing radio-astronomy on the sun since 20 years with 'good' receivers,this project is to test with the receivers of the time of the discovery of radio-astronomy,nostalgia ... For those interested there is a book 'The early years of radio-astronomy' at Cambride university press ,that describes the material used at that time it is very interesting . In fact Reber at the beginning around 1939 used a 31 feet parabola and a trf amplifier with 4* 955 acorn tubes amplifier,and a 953 acorn diode ....the bc624 is of the nearly same time but as a superhet will be more sensitive ,the 9003 input tube is the successor of the 955 acorn in an another 'box'. This is for some explanations of all the questions. Of course if a scr522 fan club is done ,count on me with the bc625 and bc 624. Thanks again all of you 73 alain f1gqb |
scr522-bc624
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 |
scr522-bc624
Lionel Sharp wrote:
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. You make it sound like we (the US) were doing something evil, by lending you our manufacturing capability, and helping you with the war effort. -Chuck |
scr522-bc624
Litzendraht wrote:
Thank you Thierry for sending the schematic to Alain. I wish Alain well in his radio astronomy ventures with 60 year old radio equipment. I have them all the time. Can't somebody DO something about Jupiter and the sun? They're always causing interference for me. Can't the FCC get them shut down or something? --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
scr522-bc624
Chuck Harris wrote:
Lionel Sharp wrote: 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. You make it sound like we (the US) were doing something evil, by lending you our manufacturing capability, and helping you with the war effort. -Chuck G'day Chuck No that was not the intention. Perhaps you can suggest another word that is more to your liking Lionel L Sharp, VK4NS |
scr522-bc624
Chuck Harris wrote:
You make it sound like we (the US) were doing something evil, by lending you our manufacturing capability, and helping you with the war effort. Chuck, I think it might have been more a case of "immitation is the best form of flattery". I wasn't old enough to remember, but us Yanks were probably using all HF radio in our fighters and bombers. But once we got involved in the war effort, the success of the RAF and others with VHF radio must have told us that we needed similiar equipment. We could have certainly started from ground zero with our own designs, but reliable aircraft communications was a vital factor at the time, and VHF, being still a new form of transmission in those days, would have taken months and months on the drawing boards and lab and field testing to come up with a viable, operational unit. I can see where it could have been quite desireable to take a known working design, put our Yankee spin on it and get it into production. We and the Allies had a big job ahead of us over there and time was of essence. And yes,we were lending and loaning supplies, equipment, manufacturing, (and fighting men as well), as a part of a team effort to resolve a terrific world threat. John |
scr522-bc624
Litzendraht wrote:
Chuck Harris wrote: You make it sound like we (the US) were doing something evil, by lending you our manufacturing capability, and helping you with the war effort. Chuck, I think it might have been more a case of "immitation is the best form of flattery". I wasn't old enough to remember, but us Yanks were probably using all HF radio in our fighters and bombers. But once we got involved in the war effort, the success of the RAF and others with VHF radio must have told us that we needed similiar equipment. We could have certainly started from ground zero with our own designs, but reliable aircraft communications was a vital factor at the time, and VHF, being still a new form of transmission in those days, would have taken months and months on the drawing boards and lab and field testing to come up with a viable, operational unit. I can see where it could have been quite desireable to take a known working design, put our Yankee spin on it and get it into production. We and the Allies had a big job ahead of us over there and time was of essence. And yes,we were lending and loaning supplies, equipment, manufacturing, (and fighting men as well), as a part of a team effort to resolve a terrific world threat. John Hi John, Everything I read says the SCR-522 was a redesign of the British TR-1123, that was done to make it possible to mass produce it with US tooling. Certainly the US used the TR-1123 design as a quick way of getting a working VHF design into the war as quickly as possible. It was several years before the much more capable ARC-1 came out. My only objection was the way the OP stated that it was copy. It had the familiar taste of US bashing. If I read the OP's intentions incorrectly, and it sounds like I probably did, I am sorry. -Chuck |
scr522-bc624
Chuck Harris wrote:
Litzendraht wrote: Chuck Harris wrote: You make it sound like we (the US) were doing something evil, by lending you our manufacturing capability, and helping you with the war effort. Chuck, I think it might have been more a case of "immitation is the best form of flattery". I wasn't old enough to remember, but us Yanks were probably using all HF radio in our fighters and bombers. But once we got involved in the war effort, the success of the RAF and others with VHF radio must have told us that we needed similiar equipment. We could have certainly started from ground zero with our own designs, but reliable aircraft communications was a vital factor at the time, and VHF, being still a new form of transmission in those days, would have taken months and months on the drawing boards and lab and field testing to come up with a viable, operational unit. I can see where it could have been quite desireable to take a known working design, put our Yankee spin on it and get it into production. We and the Allies had a big job ahead of us over there and time was of essence. And yes,we were lending and loaning supplies, equipment, manufacturing, (and fighting men as well), as a part of a team effort to resolve a terrific world threat. John Hi John, Everything I read says the SCR-522 was a redesign of the British TR-1123, that was done to make it possible to mass produce it with US tooling. Certainly the US used the TR-1123 design as a quick way of getting a working VHF design into the war as quickly as possible. It was several years before the much more capable ARC-1 came out. My only objection was the way the OP stated that it was copy. It had the familiar taste of US bashing. If I read the OP's intentions incorrectly, and it sounds like I probably did, I am sorry. -Chuck G'day Chuck. There was no intention of US bashing or of there being something evil in my story. John (see above) stated the situation better than I and I agree with his sentiments. Lionel L Sharp, VK4NS |
scr522-bc624
Lionel Sharp wrote: Chuck Harris wrote: Litzendraht wrote: Chuck Harris wrote: You make it sound like we (the US) were doing something evil, by lending you our manufacturing capability, and helping you with the war effort. Chuck, I think it might have been more a case of "immitation is the best form of flattery". I wasn't old enough to remember, but us Yanks were probably using all HF radio in our fighters and bombers. But once we got involved in the war effort, the success of the RAF and others with VHF radio must have told us that we needed similiar equipment. We could have certainly started from ground zero with our own designs, but reliable aircraft communications was a vital factor at the time, and VHF, being still a new form of transmission in those days, would have taken months and months on the drawing boards and lab and field testing to come up with a viable, operational unit. I can see where it could have been quite desireable to take a known working design, put our Yankee spin on it and get it into production. We and the Allies had a big job ahead of us over there and time was of essence. And yes,we were lending and loaning supplies, equipment, manufacturing, (and fighting men as well), as a part of a team effort to resolve a terrific world threat. John Hi John, Everything I read says the SCR-522 was a redesign of the British TR-1123, that was done to make it possible to mass produce it with US tooling. Certainly the US used the TR-1123 design as a quick way of getting a working VHF design into the war as quickly as possible. It was several years before the much more capable ARC-1 came out. My only objection was the way the OP stated that it was copy. It had the familiar taste of US bashing. If I read the OP's intentions incorrectly, and it sounds like I probably did, I am sorry. -Chuck G'day Chuck. There was no intention of US bashing or of there being something evil in my story. John (see above) stated the situation better than I and I agree with his sentiments. Lionel L Sharp, VK4NS For more details, check out www.aafradio.org - the Americans could not communicate with t-he British who were using VHF in their aircraft, so the SCR522 was a "copy" of the British design until the Americans could do the necessary R & D. No slight on our American friends intended - stop being so paranoid! - when we do want to insult you, you will be left in no doubt hi hi Andrew VK3BFA. |
scr522-bc624
Well,
Chuck, Andrew, and Lionel, I'm glad we got this topic resolved. And further discussion of the BC 624 and 625 can now begin. My first two meter rig was a home brewed transceiver using a design from the old 112mc. WERS (war emergency radio service) band. I used a 6C4 triode as a super-regen detector which reverted to an ultra audion oscillator on transmit using a multi-section rotary switch. 6AT6 1st audio/mic amplifier and 6V6 audio output/modulator. I had a buddy across town that shared interest in two meters and he had a similiar rig, but with a single 3A5 dual triode tube and it used batteries. My rig ran on a 150 volt supply and would just light a #47 pilot lamp as a dummy load. My friends rig on "B" batteries showed no output with a lamp load. But it worked! We were about 3 or 4 miles apart and made a solid QSO. My first real two meter rig was a T23/ARC-5 transmitter that I bought at a surplus dealer for $12. That prompted me to build a crystal controlled converter using two 6AK5's and two 6J6's and used that ahead of a Hammarlund HQ-129X receiver. Built a home made 5 element Yagi made from old TV antenna hardware. I was on the air on two meter AM in fine style. The 522 came along a bit later when someone gave me a bunch old stuff. I spent many hours replacing all those Micamold paper condensers in the receiver. I had a lot of fun with the 522 and the T23 and learned a whole lot about VHF. My present day knowledge has not advanced anything beyond those days prior to 1960. Ha! For you chaps down under, talking about old times motivated me to pull an early log book. My first QSO with VK land was VK2EG on 14.065 mc. in 1957. I was running 100 watts input to a pair of push-pull 807's and a ground plane antenna. And the HQ-129X receiver, of course. Been a long day, I'm gonna grab a cold 807. Hi! 73, John |
scr522-bc624
All,
In the late 50's, all of us who wanted to get on 2-meters used the '522 transmitter. I also seem to recall that we could, and did, trade the finals either the 832A for an 829B, or vice versa, to get a bit more power. I think there was a mechanical consideration, too.. but that was a long time ago! That transmitter, plus a Tapetone or Tecraft receiver converter, and you were on your way. de K3HVG |
scr522-bc624
Andrew VK3BFA wrote:
G'day Chuck. There was no intention of US bashing or of there being something evil in my story. John (see above) stated the situation better than I and I agree with his sentiments. Lionel L Sharp, VK4NS For more details, check out www.aafradio.org - the Americans could not communicate with t-he British who were using VHF in their aircraft, so the SCR522 was a "copy" of the British design until the Americans could do the necessary R & D. No slight on our American friends intended - stop being so paranoid! - when we do want to insult you, you will be left in no doubt hi hi Andrew VK3BFA. Hi Lionel, Andrew, etal, I am sorry for over reacting. My first 2M rig was a decidedly breadboard contraption that used a 6J6 as a push-pull oscillator, and had a modified phonograph audio output stage as the modulator. It had no xtal, and drifted so badly that I could never be sure where I would end up. I ditched that mess, and used a borrowed ARC-1 in its original 28V dynamotor condition. The ARC-1 was pure pleasure to operate. It sounded nice (inspite of its carbon microphone), and could change channels at a whim. A lot of folks swapped 829's in for 832's in some of the vhf rigs, but the ARC-1 was too compact for that treatment. The 829 was a fair bit taller, and would run into the top of the bakelite socket assembly the ARC-1 used. -Chuck |
scr522-bc624
Still have an ARC-1. It one of those that Eastern Airlines (?)
converted to 50 channels. While working for Page Airways at DCA in the mid-60's, I managed to get the unit and an original book with the ComCo airline mod included. |
SCR 522--BC 624
nierveze wrote: the 9003 input tube is the successor of the 955 acorn in an another 'box'. Alain, I was pleased that you mentioned the 9003 being the successor of an acorn tube. I started to mention that when I said I replaced the 9003's with 6AK5's. There was a series of 7 pin minatures that replicated some of the acorns. I think the 9003 was actually the replacement for a 954 pentode acorn and the 9002 (also used in the BC 624) replaced a 955 triode. My B&W grid dip meter that I've had for a hundred years uses a 955 oscillator. And I did some tinkering in those early days with portable 2 metre equipment with 957 battery triodes. One small transmitter I built used a single 957 ultra-audion oscillator and I modulated it with a Shure magnetic microphone in series with the grid resistor ground return. Pretty simple circuit. It sounded great on the BC 624! What type of antenna array do you plan to use? Do you know the frequency range that was used in the early experiments that you mentioned? John |
SCR 522--BC 624
Litzendraht wrote:
nierveze wrote: the 9003 input tube is the successor of the 955 acorn in an another 'box'. Alain, I was pleased that you mentioned the 9003 being the successor of an acorn tube. I started to mention that when I said I replaced the 9003's with 6AK5's. There was a series of 7 pin minatures that replicated some of the acorns. I think the 9003 was actually the replacement for a 954 pentode acorn and the 9002 (also used in the BC 624) replaced a 955 triode. My B&W grid dip meter that I've had for a hundred years uses a 955 oscillator. And I did some tinkering in those early days with portable 2 metre equipment with 957 battery triodes. One small transmitter I built used a single 957 ultra-audion oscillator and I modulated it with a Shure magnetic microphone in series with the grid resistor ground return. Pretty simple circuit. It sounded great on the BC 624! What type of antenna array do you plan to use? Do you know the frequency range that was used in the early experiments that you mentioned? John Hello John first of all to share my happiness ,my bc624 is at home ,it took just a week to come from Honolulu to France .This fact itself is marvelous!!!It is in perfect good condition.It is marvelous to see 60 years old radio-set in such a nice condition ,it is nearly complete ,only the front panel mechanic to select channels ,has been removed .As a begining I plan to use simple 2m yagi ,I have three of then 'tailored' on 150 mhz that is an official band of radio-astronomy (shared with other services ).In the beginning of radio-astronomy after several test on microwave (around 3ghz) ,G.Reber finally used 169mhz ,a frequency that is still in use in radio-astronomy in several observatories .Here I have been using that frequency with modified vhf radio-reciver (just cut one turn out of the input coils ,and tune again ,and tv antennas are ok)alas now there is lot of qrm by vhf relais ,it is a local problem .I'll keep you informed . You are right about the tubes ,I also have a gdo of that kind ,and several acorn tubes .Thanks ,good bye 73 alain f1gqb |
scr522-bc624
Scott Dorsey wrote:
Litzendraht wrote: Thank you Thierry for sending the schematic to Alain. I wish Alain well in his radio astronomy ventures with 60 year old radio equipment. I have them all the time. Can't somebody DO something about Jupiter and the sun? They're always causing interference for me. Can't the FCC get them shut down or something? --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." Yeah! Where is "Marvin the Martian" when you need him? I guess that he is still looking for a Illudium Q-36 Explosive Space Modulator. -- Service to my country? Been there, Done that, and I've got my DD214 to prove it. Member of DAV #85. Michael A. Terrell Central Florida |
scr522-bc624
Chuck Harris wrote: My first 2M rig was a decidedly breadboard contraption that used a 6J6 as a push-pull oscillator, and had a modified phonograph audio output stage as the modulator. It had no xtal, and drifted so badly that I could never be sure where I would end up. I ditched that mess, and used a borrowed ARC-1 in its original 28V dynamotor condition. The ARC-1 was pure pleasure to operate. It sounded nice (inspite of its carbon microphone), and could change channels at a whim. A lot of folks swapped 829's in for 832's in some of the vhf rigs, but the ARC-1 was too compact for that treatment. The 829 was a fair bit taller, and would run into the top of the bakelite socket assembly the ARC-1 used. -Chuck Chuck, I feel your pain. My first attempt on 220 mc. was about 1965 and I used a breadboard contraption with a push-pull 12AT7 and I used the output section of an Olson reel to reel tape recorder as a modulator and B+ supply. It worked OK. Maybe a watt if I was lucky. I remember the ARC 1's and was there an ARC 3 or 4?, but the 522's were very common. One of my high school buddies had a 522 in the original equipment case with the contol box. When he changed frequencies, what a sound! Kind of a clacking, ripping noise as those shifter slides did there thing. But it worked and sounded good. And my "S" meter kicked up when he talked. If you recall, the driver was modulated along with the PA. I used 829's (or 3E29's) in both my 522 and T23/ARC 5 rigs. In the T23, I got rid of the PA turret assy and replaced it with a nice 4 turn center tapped coil and butterfly tuning condenser (from a 522 with a couple of plates removed). Those were the days! They'll never return, but I'm glad I was there and had the experience. Sorta like steam trains and "hot boxes". How many people today have ever seen a hot box? I'm glad I have the memories, and no one can take them away. John |
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