Improving A Simple FET Regenerative Receiver - Part One
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- เผยแพร่เมื่อ 27 มี.ค. 2024
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I built my first regen receiver designed by N1TEV thanks to my friend Henrik - DK8HM, but I always wanted to do little modifications. I thought it would be nice to share the process for those wanting to learn how to modify simple circuits, even if there is not much knowledge on the subject.
73, YO6DXE.
*** BLOG POST:
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*** PCB BOARDS:
( coming soon )
*** FIRST VERSION DESIGNED BY N1TEV:
• Simple Shortwave Radio...
*** PART TWO OF THE VIDEO
• Improving A Simple FET...
*** PART THREE OF THE VIDEO
• GIVEAWAY - Improving A...
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I’m a sucker for any regen receiver circuit. I just love to watch these videos.
In fairness to Charles Kitchen, his circuits were published in QST in the late 1980s when air variable capacitors, though still challenging to find, were far easier to get than today.
I have no trouble finding them, they’re just very expensive
Ohh yes I agree on that. I love his circuits for the performance but still keeping them simple. I just wanted to adapt it to "today" but still keep it simple... and make it smaller too hehe. 73, YO6DXE.
They are indeed. Sometimes we may get lucky and find some for cheap... or presents... but not always 😁. 73, YO6DXE.
I like very much that idea : taking a design and trying to improve it. Waiting for the next video
I hope we improve it 🤣🤣. Working on the second video now. Still a lot of changes to do to get it to work as I wish it would. Let's see what turns out to be. 73, YO6DXE.
Nu ma gandeam ca va iesi video-ul asa de repede! Abia astept urmatoarea parte!
Azi lucrez deja la urmatorul... poate maine sau Duminica sa-l postez. Inca imi da de cap circuitul... bobina mai exact... ca de obicei 🤣. 73, YO6DXE.
Great video, I will follow this series closely. Thank-you. 👍
I am still having a little issues with it but I think on Sunday I will post part two. So far I am testing things 😁. 73 and happy weekend, YO6DXE.
Excellent Ciprian ... really enjoying this series. Looking forward to seeing how this progresses...
Working on part two as we speak. I am as curious as you are trust me 😁. Thank you for watching. 73, YO6DXE.
Small tuning capacitors are still available such as the kind that would be used in commercially made pocket receivers. They're not expensive either.
Yes... those I used for the original version. I don't like them that much though. Very hard to tune and a vernier drive is twice the price of a multiturn potentiometer... sometimes even more expensive ( at least here in Romania). 73, YO6DXE
@@dxexplorer All I can think of is the possibility to use a reduction pulley which was fairly common in older table top receivers. There was even special string sold for it suggesting the need for occasional replacement, though I never needed to do that. Good luck with your eventual solution whatever it may be. N1KHB
@joewoodchuck3824 Thank you so much. Hmmmmn that is not a bad idea at all. I need to try that too. Especially because these capacitors are also cheap. I tried making some reduction drive using little gear wheels from remote controlled cars... but it was taking too long ))). 73, and have an amazing rest of the week, YO6DXE
that's a very good way to learn electronic. thank you
Is how I started... all I had was a box full of junk parts and a multimeter 😁😁. 73, YO6DXE.
I loved your Video and Channel and what all about
from what i can see here , there is some issues regarding FET Transistor biasing ..
Also the variable capacitor tuning is a little bit rough because it of (5 MHz tuning width) which considered very wide ...
However i am very anxious to see next episode ...
The tuning part I managed to fix really easy and now it works fantastic. Is just the regen control / transistor biasing combination that are not yet perfect and as I want it to be... but I am working on making final adjustments until I get it to sound as I please so my ears will be happy finally 😁😁. 73, YO6DXE
Great Job... 💯👍
Thank you so much. Working now on part two as we speak. 😁🙏. 73, YO6DXE.
Ofcourse, regen is exclusive
Not always... but I find them special 😁. They remind me of my childhood so it feels good to travel back in time 😁... at least this way. 73, YO6DXE.
Big hug from Argentina. Keep doing videos like this.
I am really interested in 6 Meters band. What about a little receiver for 6?
LU8ARM
I never built one. Good idea... I will put that on the list. 73, YO6DXE.
I'll be following close. I keep planning on building a Kitchin regen with those changes, but postponing it to later...
I also had this one on the list for a very long time. It was about time to build it 😁. 73, YO6DXE.
Good video
Thank you so much. Hopefully it will get even better towards the end of the mini series 😁. 73, YO6DXE.
Hi, great project and thanks for a video update. Any news and progress made further?
Hi.. yes I am working on the video right now. I think I will post it this Tuesday. I wanted today but I have some emergencies to take care of so I had no time. 73, YO6DXE.
You are the beginner, and I am Julius Caesar. Makes sense 😊
🤣🤣🤣 but is true... I am still a beginner... I may seem like I know a lot but I don't. I just build a lot and try to learn on the way. I wish I knew a little more... but there is not much time to study unfortunately. 73, YO6DXE.
Perfect ❤️❤️❤️
Let's hope the new one will work... so far not so good ))). 73
@@dxexplorer
god bless you 😍😍🙏
@captmohelsaadany6751 🙏🙏🙏 you too buddy. 73
I Mean activity
nice video. i think series gonna be interesting😁. so about the problem. when there is for example 1k ohm resistor in the schematic and voltage is not like it shoud be yeah you need to change it from 1k to 1.5k or 800 ohms or close to 1 k ohm, but when you change 2.7k ohm resistor with 10k and it still does not meet requirments i belive the problem is somwhere else. 7.3k is big jump for such a small change you got here. at max you need to change it from 2k to 4k no more than that.
Usually yes. In this case I had to check other similar circuits just to see what is different and it seems that some ho as high as 27K ... and it seems to be relative to the voltage that I power the circuit with. I am sure there is an entire theory behind but now I don't have the time to study that hahaha. We will see as for sure the circuit will need adjustments in time in order to get it to work as I like to. For now I am not so happy about the regen part as I was with the sputnik where the regen was really smooth and the demodulated CW and SSB signals sounded much better. Testing in progress for now 😁😁. 73, YO6DXE.
Are their Activision on that band you play with on this receiver
Of course yes. Is receiving from 6.5MHz to 14.5MHz so is 3 amateur radio bands available... 40m, 30m and 20m. On 40 you get to listen to DX and local stations... on 30m usually a lot of digital and CW and on 20m mostly DX stations. And of course a lot of AM broadcast stations too.
Would you say that the cheap Chinese xdata radio is better than the best regen reciever ?
I don't know what receiver you are talking about. Do you have a link ? The xdata Chinese receiver I mean. 73, YO6DXE
Kg7uqo
yay inductive / marginal learning!
Is what I call "play by ear" 🤣🤣... the way I used to build circuits when I knew nothing about it and had no measurement equipment except a simple multimeter. A lot of trial by error but it works... most of the time 😁. 73, YO6DXE.
Salut, pentru părțile următoare, te rog da ne detalii și pentru versiunea de 10-11m, 😊😊😊
Haha... o sa te fac sa razi... dar nu o sa dau ))). Ideea este sa experimentezi si sa descoperi singur ))). Da povestim ca e usor de schimbat 😛.
Hello! I made several experiments with super regenerator with two transistors in barrier mode. The results was unsatisfied (I use a part of coil to matching impedance) - only -85dBm. It was an idea to make sensitive super regenerative receiver for 430MHz.
I never tried regens for VHF / UHF... maybe I have to make one of those too sometime 😁. 73, YO6DXE.
@@dxexplorer In my opinion for the UHF the best solution is a diode ring mixer (with BAT-15 diodes) and low IF AM/FM amplifier (with capacitors as filter) first stage - low noise bjt with, other stages are with capacitor filters) , that can be realized very easy.There also exists an image, but it is the simplest super. As a geterodyne can be used ASK transmitter with PLL. It is the simplest solution.