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PostPosted: Sun Jul 11, 2010 8:21 am 
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Anyone have pointers to simple solid state regenerodyne/regenodyne receiver circuits? I've only found one, Rick Andersen's at http://www.ke3ij.com/AGC-8030.htm . Most other sites I found use tubes. Any other solid state designs out there?


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PostPosted: Sun Jul 11, 2010 12:47 pm 
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qrp-gaijin wrote:
Any other solid state designs out there?

What's a regenerodyne? It's a regenerative receiver with heterodyne converters. Any regenerative receiver coupled with any heterodyne converter becomes a regenerodyne.

Now you have a basis. Choose the regen design of your liking. A popular tuning range is 2-3 MHz. You can use cheap computer crystals to heterodyne common SWBC bands to 2-3 MHz. A 12-MHz crystal will make a converter that tunes 10-9 MHz and 14-15 MHz. You only have to change the front-end bandpass filter to suit the desired tuning range. The converter part is a mixer and local oscillator, and there are many ways to do that. You can use a single FET or bipolar for the mixer to get started. Look for "shortwave converter" circuits online. Many of them use tunable oscillators. Because your receiver is tunable, you can use crystal-controlled oscillators. So look for "crystal oscillator" and "mixer" circuits.

I have an old MFJ shortwave converter that was made when car radios had continuous tuning. It uses fixed-tuned LC oscillator circuits, but crystals would be cheaper now, and they're sure more stable.

One thing to keep in mind when designing the regen part: You don't want signals within its tuning range leaking through, so design for good shielding. One advantage of the 2-3 MHz band is, there aren't many strong signals in that range. The MFJ converter uses the AM BCB, and a few local BC stations bleed through it.

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 Post subject: regenerodyne
PostPosted: Sun Jul 11, 2010 7:36 pm 
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Hmm,

If you are thinking of a solid state versions of this:

http://www.qsl.net/wd4nka/TEXTS/REGENf~1.HTM#WHAT

I haven't really found a really close one in solid state!

The author of this:

www.we0h.us/.../How-to-Build-Advanced-S ... eivers.PDF

Did have a receiver that was kinda close, but I dont seem to find the article online any more.

It was titled "A Simple S.W Superhet" and is the closest that I have seen to a solid state versions of Gary's "regenerodyne".


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PostPosted: Fri Feb 07, 2014 4:56 am 
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Location: Connecticut
I recently discovered this, 'A 40m Regenerodyne Receiver':

http://fhs-consulting.com/aa1tj/thetalkingdoll.html

The schematic can be found here:

http://fhs-consulting.com/aa1tj/TalkingDoll.pdf

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PostPosted: Fri Feb 07, 2014 3:08 pm 
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Joined: Fri Jun 19, 2009 8:30 pm
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Location: The Netherlands
Here is an example of a very simple shortwave converter which converts the 49m-band around 6 MHz to an IF of 1.6 MHz. You can use any Mediumwave Regenerative receiver as the IF stage. It is described at http://www.b-kainka.de/bastel86.htm and http://www.transkommunikation.ch/dateien/schaltungen/diverse_tbs_schaltungen/Kurzwellenkonverter.pdf. This article is in German, use Google Translator to translate into English.

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Here at http://aa1tj.blogspot.nl/2011/08/point-contact-transistor-superhet.html and http://aa1tj.blogspot.nl/2011/08/1950s-transistorized-ultra-simple.html another transistor regenerodyne receivers are described.


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PostPosted: Tue Jun 03, 2014 7:24 pm 
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Joined: Fri Jun 19, 2009 8:30 pm
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Location: The Netherlands
At http://www.dk8af.de/Goettinger_Baby_II.html there is an article about the Göttinger Baby, another superhet with a regenerative IF-stage.

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