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Homebrew Equipment A place to show, design and discuss the weird and wonderful electronic creations from the hands of individual members. |
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2nd Nov 2017, 4:27 pm | #1 |
Nonode
Join Date: Jul 2005
Location: Hull, East Yorkshire, UK.
Posts: 2,087
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Chinese 1A2 Super Regenerative FM radio kit
At least one Forum member has tried to make one of these kits in 2014.
After a great deal of effort to decipher the Chinese instructions and get the clearest information possible it still did not work. Did anybody have any better luck? Would it be fair to say that they are a waste of time? |
2nd Nov 2017, 4:32 pm | #2 |
Dekatron
Join Date: Aug 2013
Location: Wigan, Greater Manchester, UK.
Posts: 9,433
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Re: Chinese 1A2 Super Regenerative FM radio kit
I am not too keen on super regens unless lots of care is taken to stop them radiating signal back into the aerial.
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Frank |
2nd Nov 2017, 4:43 pm | #3 |
Nonode
Join Date: Jul 2005
Location: Hull, East Yorkshire, UK.
Posts: 2,087
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Re: Chinese 1A2 Super Regenerative FM radio kit
The description of the kit online says Super Regenerative, but perhaps they aren't. That was the opinion of a old thread on them from 2014.
If you have looked at various kits you will realise how weird the text can be. Technobabble doesn't translate well in an on-line service. When you are dealing with frequencies at which construction has to be much more precise the deck is definitely stacked against you. |
2nd Nov 2017, 4:58 pm | #4 | |
Nonode
Join Date: May 2007
Location: Redruth, Cornwall, UK.
Posts: 2,580
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Re: Chinese 1A2 Super Regenerative FM radio kit
Hi
Is the attached circuit diagram similar to yours? There's an 'interesting' comment that says: Quote:
Regards Symon. |
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2nd Nov 2017, 5:03 pm | #5 |
Hexode
Join Date: Jul 2014
Location: Magor, Monmouthshire, Wales, UK.
Posts: 436
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Re: Chinese 1A2 Super Regenerative FM radio kit
It means you can't see the filament glow under normal light, unlike a normal indirectly heated valve.
T
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Adapt, Improvise, Oh Bother..... |
2nd Nov 2017, 5:08 pm | #6 |
Nonode
Join Date: May 2007
Location: Redruth, Cornwall, UK.
Posts: 2,580
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Re: Chinese 1A2 Super Regenerative FM radio kit
Ah, thanks.
Regards Symon. |
2nd Nov 2017, 5:16 pm | #7 |
Nonode
Join Date: May 2007
Location: Redruth, Cornwall, UK.
Posts: 2,580
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Re: Chinese 1A2 Super Regenerative FM radio kit
Hi
Super Regenerative receivers are tricky to get working. There was a good super regen circuit published in EPE magazine by Raymond Haigh in 2003 but that was a transistor circuit. I built that and it worked very well. I will try to see if I can find it. Regards Symon. |
2nd Nov 2017, 5:57 pm | #8 |
Octode
Join Date: Mar 2011
Location: Sheffield, South Yorkshire, UK.
Posts: 1,453
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Re: Chinese 1A2 Super Regenerative FM radio kit
Does this offer any clues?
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2nd Nov 2017, 8:42 pm | #9 | |
Pentode
Join Date: Oct 2008
Location: Downham Market, Norfolk, UK.
Posts: 143
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Re: Chinese 1A2 Super Regenerative FM radio kit
Quote:
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Regards, John. |
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2nd Nov 2017, 10:06 pm | #10 |
Nonode
Join Date: May 2007
Location: Redruth, Cornwall, UK.
Posts: 2,580
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Re: Chinese 1A2 Super Regenerative FM radio kit
Hi John.
It was part of the Practical Radio Circuits series by Raymond Haigh but I can't seem to see it listed on your link. It would appear that EPE have only offered a selection of the circuits free. Thanks anyway, it's useful to see the other free circuits. I've just checked and found the circuit is in the October 2003 issue of EPE. I had a rummage in a large box of radio projects in the garage and just came across this project which I built about 12 years ago (see attached pic). Regards Symon. |
3rd Nov 2017, 1:02 am | #11 |
No Longer a Member
Join Date: Oct 2016
Location: Maroochydore, Queensland, Australia.
Posts: 2,679
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Re: Chinese 1A2 Super Regenerative FM radio kit
Thepillenwerfer,
That article you attached is very good and it illustrates an interesting point about super-regenerative receivers, not only do they work for AM reception, they can do a good job of slope detecting FM too. The other thing, it's dead easy to turn the stage into a transmitter, with a switch and a few small circuit changes, so they make for a really simple transceiver design. I have two super-regen transceivers constructed with 6CW4 nuvistors that work amazingly well at UHF. I can't attach the photo currently, but could next week. |
3rd Nov 2017, 9:07 am | #12 |
Nonode
Join Date: Jul 2005
Location: Hull, East Yorkshire, UK.
Posts: 2,087
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Re: Chinese 1A2 Super Regenerative FM radio kit
The matter under discussion is supposed to be the circuit on post #4.
Here is the old thread on the same circuit: http://www.vintage-radio.net/forum/s...d.php?t=105296 Has anybody successfully completed the kit and actually got FM radio sound from it? |
3rd Nov 2017, 9:49 am | #13 |
Pentode
Join Date: Oct 2008
Location: Downham Market, Norfolk, UK.
Posts: 143
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Re: Chinese 1A2 Super Regenerative FM radio kit
"High Performance Regenerative Receiver" By Raymond Haigh (parts 1&2) is in the Radio section in that list
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Regards, John. |
3rd Nov 2017, 10:20 am | #14 |
Nonode
Join Date: May 2007
Location: Redruth, Cornwall, UK.
Posts: 2,580
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Re: Chinese 1A2 Super Regenerative FM radio kit
That's not a super regenerative receiver John.
Symon. |
3rd Nov 2017, 10:34 am | #15 | |
Nonode
Join Date: May 2007
Location: Redruth, Cornwall, UK.
Posts: 2,580
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Re: Chinese 1A2 Super Regenerative FM radio kit
Quote:
Symon. |
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3rd Nov 2017, 11:19 am | #16 |
Pentode
Join Date: Oct 2008
Location: Downham Market, Norfolk, UK.
Posts: 143
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Re: Chinese 1A2 Super Regenerative FM radio kit
Sorry Symon, showing my ignorance
EDIT. I may have redeemed myself? 2003 and other years available via this link ..... http://www.diagram.com.ua/english/li...nics-magazine/ I am assuming this site is a legal archive although I cannot be certain. If there are any doubts please delete this reply. I would not wish to infringe copyrights.
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Regards, John. Last edited by nebogipfel; 3rd Nov 2017 at 11:42 am. |
3rd Nov 2017, 12:54 pm | #17 |
Nonode
Join Date: Jul 2005
Location: Hull, East Yorkshire, UK.
Posts: 2,087
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Re: Chinese 1A2 Super Regenerative FM radio kit
I am going to purchase one from ebay and see how it works out.
Do let us know how you get on. I think that if anybody else has tried one of the kits they are keeping silent. They failed to get it to work and are embarrassed about it. But the fault must lie in the lack of precise instructions. |
3rd Nov 2017, 1:18 pm | #18 |
Nonode
Join Date: May 2007
Location: Redruth, Cornwall, UK.
Posts: 2,580
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Re: Chinese 1A2 Super Regenerative FM radio kit
Hi.
I was trying to find some information on the 1A2 valve and there's nothing on the National Valve Museum website. From my quick searches, there doesn't seem to be an equivalent which I find hard to believe. I (wrongly) assumed it would be like one from the battery valve portables from the early 1950s. Regards Symon. |
3rd Nov 2017, 1:24 pm | #19 |
Dekatron
Join Date: Apr 2011
Location: Cornwall, UK.
Posts: 13,454
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Re: Chinese 1A2 Super Regenerative FM radio kit
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3rd Nov 2017, 1:29 pm | #20 | |
Nonode
Join Date: Aug 2010
Location: Resolven, Wales; and Bristol, England
Posts: 2,614
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Re: Chinese 1A2 Super Regenerative FM radio kit
Quote:
I've no doubt the remains of the kit are in a box somewhere.....
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