Newbie question on LF adapters
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Hello Peter,
Attached you will find the requested pictures; the RA 137A is the British version. I can supply a mains cable with a matching 3-pole connector and may be I can find some RF-cables, but that will take some searching time. I cannot help you with a schematic for the 237 (my 137A will come with a copy of the original manual. (But I found good information on the restauration of a 237; see attached PDF). In the past I had plans to restore an RA117E together with a RA137A, and a RA63A or RA98A, but my health has seriously restricted this part of my hobbies. It does mean, that I have not done any work on the 117E and subsequently, I have been unable to test the 137A or any of the other equipment, so I am offering the RA137A-1 "as is" for € 60,00 including packaging but excluding transport to the UK The following websites may contain more info on the 237, but I could not find any schematics there: search for racal again, search for racal PayPal is ok for me. Let me know about your plans. Best regards, Cees Bekkers -----Oorspronkelijk bericht----- Van: [email protected] <[email protected]> Namens Pete Connors G4PLZ Verzonden: woensdag 23 november 2022 12:22 Aan: [email protected] Onderwerp: [RacalRA17forum] Newbie question on LF adapters Greetings to all Last having owned a RA17 in the 1970s, I have acquired a clean looking RA117E to refurbish. I would like to accompany this eventually with an LF converter, ideally the RA237, but if I used an RA137 the only difference appears to be the 2Mhz crystal notch somewhere around the cathode follower. I cannot locate a circuit diagram to check the actual configuration but it does not seem too problematic to add a 2MHz xtal notch to an RA137. Does anybody have a circuit diagram of the RA237? Or can anybody tell me how much the use of an unmodified RA137 would compromise performance? Best regards, Pete Connors G4PLZ |
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Hi Pete,
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I have the original Racal manual for the RA-237B (North American version). I am surprized that it is not available on BAMA. Providing that I find some time to do it, I can put it on the scanner bed and provide you with a .pdf copy. Let me know if you are interested. 73, Jacques, VE2JFE in Montreal -----Message d'origine-----
De?: [email protected] <[email protected]> De la part de Pete Connors G4PLZ Envoy¨¦?: 23 novembre 2022 06:22 ??: [email protected] Objet?: [RacalRA17forum] Newbie question on LF adapters Greetings to all Last having owned a RA17 in the 1970s, I have acquired a clean looking RA117E to refurbish. I would like to accompany this eventually with an LF converter, ideally the RA237, but if I used an RA137 the only difference appears to be the 2Mhz crystal notch somewhere around the cathode follower. I cannot locate a circuit diagram to check the actual configuration but it does not seem too problematic to add a 2MHz xtal notch to an RA137. Does anybody have a circuit diagram of the RA237? Or can anybody tell me how much the use of an unmodified RA137 would compromise performance? Best regards, Pete Connors G4PLZ |
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RA237B manual (with schematic) attached.
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Gerry O'Hara VE7GUH (author of the article) -----Original Message-----
From: [email protected] <[email protected]> On Behalf Of Hawkeye via groups.io Sent: November 23, 2022 7:25 AM To: [email protected] Subject: Re: [RacalRA17forum] Newbie question on LF adapters Hello Peter, Attached you will find the requested pictures; the RA 137A is the British version. I can supply a mains cable with a matching 3-pole connector and may be I can find some RF-cables, but that will take some searching time. I cannot help you with a schematic for the 237 (my 137A will come with a copy of the original manual. (But I found good information on the restauration of a 237; see attached PDF). In the past I had plans to restore an RA117E together with a RA137A, and a RA63A or RA98A, but my health has seriously restricted this part of my hobbies. It does mean, that I have not done any work on the 117E and subsequently, I have been unable to test the 137A or any of the other equipment, so I am offering the RA137A-1 "as is" for € 60,00 including packaging but excluding transport to the UK The following websites may contain more info on the 237, but I could not find any schematics there: search for racal again, search for racal PayPal is ok for me. Let me know about your plans. Best regards, Cees Bekkers -----Oorspronkelijk bericht----- Van: [email protected] <[email protected]> Namens Pete Connors G4PLZ Verzonden: woensdag 23 november 2022 12:22 Aan: [email protected] Onderwerp: [RacalRA17forum] Newbie question on LF adapters Greetings to all Last having owned a RA17 in the 1970s, I have acquired a clean looking RA117E to refurbish. I would like to accompany this eventually with an LF converter, ideally the RA237, but if I used an RA137 the only difference appears to be the 2Mhz crystal notch somewhere around the cathode follower. I cannot locate a circuit diagram to check the actual configuration but it does not seem too problematic to add a 2MHz xtal notch to an RA137. Does anybody have a circuit diagram of the RA237? Or can anybody tell me how much the use of an unmodified RA137 would compromise performance? Best regards, Pete Connors G4PLZ |
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Thanks for this one, Gerry.
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73, Jacques, VE2JFE in Montreal -----Message d'origine-----
De : [email protected] <[email protected]> De la part de Gerry O'Hara Envoy¨¦ : 23 novembre 2022 12:58 ? : [email protected] Objet : Re: [RacalRA17forum] Newbie question on LF adapters RA237B manual (with schematic) attached. Gerry O'Hara VE7GUH (author of the article) -----Original Message----- From: [email protected] <[email protected]> On Behalf Of Hawkeye via groups.io Sent: November 23, 2022 7:25 AM To: [email protected] Subject: Re: [RacalRA17forum] Newbie question on LF adapters Hello Peter, Attached you will find the requested pictures; the RA 137A is the British version. I can supply a mains cable with a matching 3-pole connector and may be I can find some RF-cables, but that will take some searching time. I cannot help you with a schematic for the 237 (my 137A will come with a copy of the original manual. (But I found good information on the restauration of a 237; see attached PDF). In the past I had plans to restore an RA117E together with a RA137A, and a RA63A or RA98A, but my health has seriously restricted this part of my hobbies. It does mean, that I have not done any work on the 117E and subsequently, I have been unable to test the 137A or any of the other equipment, so I am offering the RA137A-1 "as is" for € 60,00 including packaging but excluding transport to the UK The following websites may contain more info on the 237, but I could not find any schematics there: search for racal again, search for racal PayPal is ok for me. Let me know about your plans. Best regards, Cees Bekkers -----Oorspronkelijk bericht----- Van: [email protected] <[email protected]> Namens Pete Connors G4PLZ Verzonden: woensdag 23 november 2022 12:22 Aan: [email protected] Onderwerp: [RacalRA17forum] Newbie question on LF adapters Greetings to all Last having owned a RA17 in the 1970s, I have acquired a clean looking RA117E to refurbish. I would like to accompany this eventually with an LF converter, ideally the RA237, but if I used an RA137 the only difference appears to be the 2Mhz crystal notch somewhere around the cathode follower. I cannot locate a circuit diagram to check the actual configuration but it does not seem too problematic to add a 2MHz xtal notch to an RA137. Does anybody have a circuit diagram of the RA237? Or can anybody tell me how much the use of an unmodified RA137 would compromise performance? Best regards, Pete Connors G4PLZ |
Jacques Fortin
Gerry O'Hara