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-----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