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Looking to buy a Racal LF converter such as the 237B and other add-ons for my Racal RA 117 Rx.
I already have a RA 298 SSB/ISB Adapter and MA168B Diversity Switch
Happy to ship world wide if needed.
Thanks for reading,
Kind regards,
Terry.
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Hi Terry , I have an RA37 LF converter that came with my RA117. Happy to send photos if you can let me have your email address and an idea of price. I'm in Devon.
Cheers and 73 Lawrence G4GZG.
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Be aware that although the RA37 (no tuning scale) and the RA137 which are
both designed to extend the LF range of the RA17 and RA17L etc, may work up
to a point with an RA117, there will be unwanted mixing products and other
issues due to the fact that the 2nd VFO/Mixer in the RA117 does not include
a tuneable band-pass filter.
This is why Racal introduced the RA237 LF converter, which includes a 2MHz
crystal notch filter to further eliminate any 2MHz breakthrough. The
converter take the 1MHz from he RA17 or 117 and double it to 2MHz. The fixed
2 - 3MHz filter in the RA117 does not provide sufficient rejection.
Just saying .
Cheers,
Ian, GM0UHC
www.chavfreezone.me.uk <>
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On Thu, Apr 4, 2024 at 02:33 AM, gm0uhc wrote:
Ian
Thanks for that Ian, and for your marvelous website. Your thoughts are always welcome, and I certainly know where to ship to for a RA-237 equipment service when I find one.. The RA-37 will do for now until a RA-237 comes along. I intend to cheat a bit with the RA-37 until then. My spear HP 85685A RF Preselector has a band-pass width of 9 kHz tuneable in the 150 kHz to 30 MHz range, so I might just be able to filter out some unwanted mixing products if I am clever enough. We'll see. But I do take your point and the search for a RA-237 is ongoing. Kind regards, Terry.
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Hi Terry,
The only difference I can see between the RA-37 / 137 and the RA-237B is the
presence of the 2.000 MHz Xtal and series tuning capacitor in the RA-237B.
I am quite sure that a RA-37 can be "adapted" by adding a 2 MHz Xtal and
trimming cap.
73, Jacques, VE2JFE in Montreal
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On Thu, Apr 4, 2024 at 07:24 AM, Jacques Fortin wrote:
73, Jacques, VE2JFE in Montreal
Hi 73, Jacques, VE2JFE in Montreal, Thank you for your kind message. It can't hurt to experiment with that on the RA-37. I'll see what I can do when the RA-37 arrives. Have you tried this yourself? I've just started reading the RA-237 manual. The tuning scale of the RA-237 has some appeal, and since the RA-237 was designed with the RA-117 in mind, I'm still on the look out for a RA-237. Hopefully it can be serviced at Ian's shop when the time comes. Kind regards, Terry.
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I would be grateful to obtain an RA237B manual. I've tried the usual
internet sources but failed. The one or two links that have pdf copies are
almost impossible to interact with to download a copy.
Thanks for any help.
Douglas Denny. G3ZQE.
toggle quoted message
Show quoted text
On Fri, 5 Apr 2024, 13:12 Terry Gains, <terry.waihi@...> wrote: On Thu, Apr 4, 2024 at 07:24 AM, Jacques Fortin wrote:
73, Jacques, VE2JFE in Montreal
Hi 73, Jacques, VE2JFE in Montreal,
Thank you for your kind message.
It can't hurt to experiment with that on the RA-37. I'll see what I can do
when the RA-37 arrives. Have you tried this yourself?
I've just started reading the RA-237 manual. The tuning scale of the
RA-237 has some appeal, and since the RA-237 was designed with the RA-117
in mind, I'm still on the look out for a RA-237. Hopefully it can be
serviced at Ian's shop when the time comes.
Kind regards,
Terry.
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Hi Douglas....
Hope this works; if all goes well, pleas find attached a PDF of the manual....
If not, contact me again and we will try another way to get it to you...
73
Kees PE1BEY
Op 5-4-2024 om 22:22 schreef Douglas Denny:
toggle quoted message
Show quoted text
I would be grateful to obtain an RA237B manual. I've tried the usual
internet sources but failed. The one or two links that have pdf copies are
almost impossible to interact with to download a copy.
Thanks for any help.
Douglas Denny. G3ZQE.
On Fri, 5 Apr 2024, 13:12 Terry Gains, <terry.waihi@...> wrote:
On Thu, Apr 4, 2024 at 07:24 AM, Jacques Fortin wrote:
73, Jacques, VE2JFE in Montreal
Hi 73, Jacques, VE2JFE in Montreal,
Thank you for your kind message.
It can't hurt to experiment with that on the RA-37. I'll see what I can do
when the RA-37 arrives. Have you tried this yourself?
I've just started reading the RA-237 manual. The tuning scale of the
RA-237 has some appeal, and since the RA-237 was designed with the RA-117
in mind, I'm still on the look out for a RA-237. Hopefully it can be
serviced at Ian's shop when the time comes.
Kind regards,
Terry.
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On Fri, Apr 5, 2024 at 01:22 PM, Douglas Denny wrote:
Douglas Denny. G3ZQE.
Hi Douglas Denny. G3ZQE. Thank you for your request. By the power of Google Drive and Mathew 7:7, you will shortly receive an email with the manual attached, that you can download onto your computer. The RA 273B manual is 31 MBytes and was sourced from the Internet. Please let me know if there are any issues and enjoy reading. Kind regards and 73s, Terry.
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Dear Kees, Thank you for kindly providing a download for the RA237B. I am very grateful. 73 Dougas. On Sat, 6 Apr 2024 at 09:01, PE1BEY <keesraaijmakers@...> wrote: Hi Douglas....
Hope this works; if all goes well, pleas find attached a PDF of the
manual....
If not, contact me again and we will try another way to get it to you...
73
Kees PE1BEY
Op 5-4-2024 om 22:22 schreef Douglas Denny:
I would be grateful to obtain an RA237B manual. I've tried the usual
internet sources but failed. The one or two links that have pdf copies are
almost impossible to interact with to download a copy.
Thanks for any help.
Douglas Denny. G3ZQE.
On Fri, 5 Apr 2024, 13:12 Terry Gains, <terry.waihi@...> wrote:
On Thu, Apr 4, 2024 at 07:24 AM, Jacques Fortin wrote:
73, Jacques, VE2JFE in Montreal
Hi 73, Jacques, VE2JFE in Montreal,
Thank you for your kind message.
It can't hurt to experiment with that on the RA-37. I'll see what I can do
when the RA-37 arrives. Have you tried this yourself?
I've just started reading the RA-237 manual. The tuning scale of the
RA-237 has some appeal, and since the RA-237 was designed with the
RA-117
in mind, I'm still on the look out for a RA-237. Hopefully it can be
serviced at Ian's shop when the time comes.
Kind regards,
Terry.
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Dear Terry, Many thanks for the download for the RA237B. I am very
grateful for yours and Kees' (PA1BEY) trouble.
Best 73 to you both.
Douglas Denny.
toggle quoted message
Show quoted text
On Sat, 6 Apr 2024 at 10:22, Terry Gains <terry.waihi@...> wrote: On Fri, Apr 5, 2024 at 01:22 PM, Douglas Denny wrote:
Douglas Denny. G3ZQE.
Hi Douglas Denny. G3ZQE.
Thank you for your request.
By the power of Google Drive and Mathew 7:7, you will shortly receive an
email with the manual attached, that you can download onto your computer.
The RA 273B manual is 31 MBytes and was sourced from the Internet.
Please let me know if there are any issues and enjoy reading.
Kind regards and 73s,
Terry.
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Hello all,
Having never had my hands on a RA237, I had a look at the manual this morning.
The why of the extra filter is Obvious as Ian explained earlier.
The thought occured that is would be easy to ad that filter to a 137 or 37.
In my spares I have a 2MHz crystal + trimmer.
Will try that with one of my RA117’s next time I rotate radio’s.
At the moment Racal wise I have a RA17 MK1 + RA137 and a RA17L + RA63 (coupled to a KW Vespa MK1)
This MK1 was never upgraded to a MK2.
The MK1 is OK in daily use, but a MK 2 and the MK3 (L-version) are better.
The MK2 has extra filters to combat unwanted mixing products + better AGC. All the higher part numbers on the schematics. Also the MHz tuning is not as sturdy as the later versions. Plus some safety features.
But this thread was not about the MK1………
Regards
Pieter
PA3HDU
Verzonden vanuit Mail voor Windows
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Jacques Fortin
Douglas Denny
Pieter Lamers PA3HDU