Much better performance will be obtained by making the regeneration adjustable. A convenient way to do this is by adjusting the detector bias. Maximum selectivity and sensitivity occurs just after the detector starts oscillating.
The sensitivity can be improved bij adjusting the quench frequency (change the value of the quench resistor/capacitor to respectively 5 microH/ 3.9K) and by slightly reducing the feedback capacitor to 7pF. In that case it is imperative to use a HF transistor (I use a BF180) for the superregenerative detector. I experimented a lot with this design and found that still better results are obtained using a low battery voltage (1.5 V) for the HF part and make the bias adjustable (4.7K pot trimmer + 470K base resistor). By adjusting the bias, sensitivity can be brought up just to the point where superregeneration just starts. It is possible then to receive FM stations WITHOUT superegeneration and quite high selectivity. For the HF tank circuit coil I used a 2 turn coil made of 2.5mm thick standard copper wire.
@@lambdaprog Not at all. Superregens are deceivingly simple devices, because you only need a low number of components. Putting one together is a matter ofless than an hour, but getting it to work properly is a matter of experimentation and ... patience...
Thank you for the update. I was getting ready to build the previous radio with a student. Since we live in a rural setting I might just give this radio a try. Thank you for all you do!
I was forgotten about this design. Gonna try it this schematic and hoping to make it more selective. Been working on it last night and found out that the radio works alot better when you put the base capacitor to the top of the coil, it gains more sensitivity.
Superregens good for 110-140MHz AM aviation band. Bad for FM and NFM. I think - low IF receiver can demodulate AM, NFM, FM and SSB, CW with 32kHz clock crystal as a second oscillator.
Love these videos! The simplicity is breathtaking....will try it one day.....presently trying to build a linear PSU for the shack from JUNK! 73 de VK2AOE George
Hey Peter, I built KE3IJ's version using 2N3904's and it worked great on the bench, as soon as I stuffed it in an old metal CB walkie talkie shell, it stopped oscillating. I can hear a rushing from the speaker but no signal on the spectrum analyzer. I think the metal shell of the old walkie talkie is swamping the oscillator and throwing things out of whack, is there anything I should try before giving up on the metal case and finding something else to house it in? I tried changing the 330k bias resistor out with a 75k resistor + 250k pot in series to try and add a regeneration control but that didnt make any difference.
Muito bom tenho um quase identico com control automatico de ganho em recepção mutio boa do aeroporto de Canarias para a Madeira depois do pré amplificador ligado a uma valvula triodo e ligado a um amplificador obviamente tem uma sonaridade muito espacial...
The MacGyver of ham radio
Baste
baste and pork pilled
homebrew -homemade 100%, Excellent.
Much better performance will be obtained by making the regeneration adjustable. A convenient way to do this is by adjusting the detector bias. Maximum selectivity and sensitivity occurs just after the detector starts oscillating.
The sensitivity can be improved bij adjusting the quench frequency (change the value of the quench resistor/capacitor to respectively 5 microH/ 3.9K) and by slightly reducing the feedback capacitor to 7pF. In that case it is imperative to use a HF transistor (I use a BF180) for the superregenerative detector. I experimented a lot with this design and found that still better results are obtained using a low battery voltage (1.5 V) for the HF part and make the bias adjustable (4.7K pot trimmer + 470K base resistor). By adjusting the bias, sensitivity can be brought up just to the point where superregeneration just starts. It is possible then to receive FM stations WITHOUT superegeneration and quite high selectivity. For the HF tank circuit coil I used a 2 turn coil made of 2.5mm thick standard copper wire.
You too have destroyed thousands of toy talkie walkies to understand superregen?
@@lambdaprog Not at all. Superregens are deceivingly simple devices, because you only need a low number of components. Putting one together is a matter ofless than an hour, but getting it to work properly is a matter of experimentation and ... patience...
@@erikdevriese671 I broke many when I was 7yo. At age of 12, I was a subject matter expert.
Thank you for the update. I was getting ready to build the previous radio with a student. Since we live in a rural setting I might just give this radio a try. Thank you for all you do!
Interesting and enjoyable, still would like to see a DSB version
You do such fun stuff. Thank you
I can't wait!
I was forgotten about this design.
Gonna try it this schematic and hoping to make it more selective.
Been working on it last night and found out that the radio works alot better when you put the base capacitor to the top of the coil, it gains more sensitivity.
Superregens good for 110-140MHz AM aviation band. Bad for FM and NFM.
I think - low IF receiver can demodulate AM, NFM, FM and SSB, CW with 32kHz clock crystal as a second oscillator.
Love these videos! The simplicity is breathtaking....will try it one day.....presently trying to build a linear PSU for the shack from JUNK! 73 de VK2AOE George
Sir please make a video on phase lock loop transmitter
Interesting discovery: BFO some 1 Mhz away improves SuperRegen. Experiment beats settled science. Cheers Peter, DL2FBA
Im The 200th Liker And Damn, I Lovve This Thing!
Hello vk3ye. Can you make VHF to AM converter for listening airband signals on normal AM radio. DE VU3IZD
Hello sir iam already subscribe your channel i am trying to make fm 2watt transmitter please make a video on it thankyou
@@MGTech0 Sorry I have no plans to make a video on this topic. Other websites have info on FM transmitters.
@@vk3ye ok thankyou for replying
I built this circuit, but it only heard the sound of uhf analog TV channels 🇱🇰
sir i didn't find 470nf cap (474) in the market can i replace it with other values
good!
Hey Peter, I built KE3IJ's version using 2N3904's and it worked great on the bench, as soon as I stuffed it in an old metal CB walkie talkie shell, it stopped oscillating. I can hear a rushing from the speaker but no signal on the spectrum analyzer. I think the metal shell of the old walkie talkie is swamping the oscillator and throwing things out of whack, is there anything I should try before giving up on the metal case and finding something else to house it in? I tried changing the 330k bias resistor out with a 75k resistor + 250k pot in series to try and add a regeneration control but that didnt make any difference.
Never actually tried it in a metal case. Come to think of it many toy walkie talkies with superregen receivers had plastic cases.
Good test but I like TRF Xtal receiver more. Superregen receiver are best 27mhz and UHF but DC receiver are for all rf bands.
*Russian government.
@@88njtrigg88 Does this have an thing to with radio ,ham radio, RF test or receiver ???? If not I am not interested!
Did you manage to hear any ham traffic with this unit? (FM Voice). Edit: Ah, heard it about 18min in. Very cool!
For the HF transistor I also tried the S9O18 with similar results?
You also destroyed cheap chinese FM radios :-)
Sir, how do I make RFC or from where would I get it?
Buy them from electronic shops like Jaycar or Altronics in Australia.
Muito bom tenho um quase identico com control automatico de ganho em recepção mutio boa do aeroporto de Canarias para a Madeira depois do pré amplificador ligado a uma valvula triodo e ligado a um amplificador obviamente tem uma sonaridade muito espacial...
Approximately how much distance it can cover
Airport ground station about 10-20km range. Plane a lot more due to height.
Please add squash..
ke3ij link is no more.
Thanks. It was OK when I checked it a few days ago. Luckily it got archived. web.archive.org/web/20210507042746/www.ke3ij.com/superrgn.htm
the russians may be interested in buying this advanced radio of you to reverse engineer.
*government.
@@88njtrigg88 i dont think anyone in the ruling dictatorship know what a radio is
I thought they all use Baofengs now
@@vk3ye big step back