Regenerative receiver on a chip ?

Thread Starter

Externet

Joined Nov 29, 2005
1,424
Hi.
Looking for an integrated circuit, device or tiny module as RF receiver that can turn on a LED when a 123MHz transmitter is nearby. Simple, no heterodyning. To work around 3V. NO demodulating needed. No audio stage nor data output used. Just a LED indicating RF activity.

These similar show in a search results :
----> https://www.aliexpress.com/item/WR-RY-RM5V-5V-4mA-Radio-Frequency-Super-Regenerative-Receiver-Module/1936209770.html
----> https://wxykpj.en.alibaba.com/product/60521105874-218870923/rf_wireless_Super_Regenerative_receiver_module_with_decoding_2272.html
----> https://www.alibaba.com/product-detail/Without-decoding-super-regenerative-receiver-module_60498709508.html?spm=a2700.details.maylikehoz.1.2d9a7fcaVm07LQ
----> https://gts-ht.manufacturer.globalsources.com/si/6008850810261/pdtl/RF-module/1163082024/RF-wireless-receiver-module.htm

Or something else...

How would you do it ?

Edited... Cannot find data on IC SCSR121
 
Last edited:

DickCappels

Joined Aug 21, 2008
6,009
Side note: Your chosen frequency is in an aircraft band and may interfere with aircraft, particularly in the vicinity of airports. You would be safer to use an ISM (Industrial, Scientific, Medical) band in which licenses are not required and the chances of interfering with critical services are small.

https://en.wikipedia.org/wiki/ISM_band
 

Thread Starter

Externet

Joined Nov 29, 2005
1,424
Thanks.
I know very well it is in the aircraft band, and that is the frequency I have to detect activity, not on ISM. Regenerative receivers emit interference ?
 

jpanhalt

Joined Jan 18, 2008
8,340
It's one of the things we love. A mystery project. Like, even if it were patentable, a fresh $Jackson would buy it. Loads of small fields have lights activated by a certain key sequence on one of the Unicom frequencies. What's "in the vicinity?" In the area of DFW that might mean something entirely different than in the area of KHYS.
 

AnalogKid

Joined Aug 1, 2013
8,227
First, I don't think a $1.38 regen receiver is going to crash aircraft communications anywhere ever, even if onboard a plane, in the cockpit, and inside the instrument panel. Second, this sounds to me like a modified crystal radio: tuned antenna coil, MOSFET preamp (depending on local field strength), seriously resonant tank, and a CMOS gate as a level detector. Am I missing something? I have a tuned-RF aircraft radio that is legal at all times on board because it doesn't emit anything, and this smells like its front end.

ak
 

AnalogKid

Joined Aug 1, 2013
8,227
Pedantic picking ...

Actually, *some* demodulation is needed. What you are doing basically is OOK - On/Off Keying, a grunt form of AM. Detecting the presence/absence of a carrier meets every aspect of what demodulation is. Granted, you don't want to recover any information modulated on the carrier, but still ...

ak
 
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