TV Tuner Tinkering with a 1 transistor superregen tunable IF
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- Опубліковано 7 сер 2024
- BADLY BEHAVED BUT IT WORKS! Add a 1 transistor superregen 20 - 60 MHz receiver with a simple audio amplifier to this Australian VHF TV tuner (see previous videos) and you can hear a wide range of VHF signals. These include FM broadcast stations, VHF airband, 2m amateurs and more.
Contents
0:00 Introduction
0:41 Superregen receiver tunable IF
2:57 Hearing 2m amateur signals
7:06 Hearing FM broadcast stations
7:29 SSB reception
8:05 2m FM amateur reception
9:39 Trying to receive lower frequencies eg aircraft band
10:21 Airband success
12:52 Circuit of tunable IF
13:51 Books by VK3YE
Talking Electronics 27 MHz circuits: www.talkingelectronics.com/pr...
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I made a valve super regen and a xtal valve transmitter as in an ARRL Handbook when I was first licenced as a G8 in 1974.
Still love making or modifying things.
G4GHB
Tuning with the proximity of a finger, a theremin at radio frequency!
As usual you always impress by doing more with less! Keep up the good work! I always look forward to your videos!
Nice....
Try low IF receiver circuit with "pulse counting" FM, NFM, AM demodulator.
If i give the output of tv tuner (30mhz IF ) into the RF input of a Single balanced diode mixer with local ossillator Frequncy of 20Mhz then i give the output of mixer to shortwave radio with 10MHz. Then can receive these bands FM airband 2m band? Please replay
Potentially. But TV tuners have different channels in different countries and may not work.
Another Fascinating project Peter, Is this working in a similar way for better tuning the old police band (here) that was once near UHF TV channel 83 by connecting an analog tunable VHF band radio's antenna to the TV sets UHF antenna jack? And then using the VHF radio as the tuner to fine tune in it with? I remember a radio shack tunable analog VHF radio, was tuned and then adjusted near 159 MHz to clear it up. It worked if you didn't have a scanner at the time. Or were the inter actions between the two doing this in reverse ?
Hard to know without knowing all frequencies involved.
Can you make a video on the one transistor super receive because i made it and i don't know where to connect the amplifier to. Making a video on it will be helpful and you showing the diagram of where to connect the amplifier. Love your videos
See the Talking Electronics link in the video description, noting the circuit at 0:57. Audio amp input connects to free end of 220k resistor.
I am also a little confused on the 70t turn coil am I supposed to turn 70 times on a 1m resistor and connect the resistor or turn 70 times on the resistor and connect the coil
@@sufiasarowar4240 You can solder the coil to the resistor and connect the resistor's lead. The resistor, as it's such a high value, has no effect except for physical support.
Thanks
Also can I use 5v instead of 6v
Brilliant and interesting project Peter.👍
Wondering if you could make a video on how to make inductors in the uH abouts, always found it to be the hardest part on making a oscillator. Buy pre-made, yes that's one way but usually one is getting these building spree kicks at the weekends and in the scrap bin there is just some old unknown ferrite pins from a old tv set or worse, nothing but some old transformers you could loot some copper wire from. Any ideas?
Half the battle is to find a good way of measuring low value inductors, like the LCR-45 that I reviewed here. ua-cam.com/video/DrWG5vAnFnk/v-deo.html
@@vk3ye Yepp, it's a pain. Using a oscilloscope, a tone generator and math, time consuming and some what frustrating at times.
That is a really nice LCR meter in your review but it is quite expensive though.
121 ok
Are there any advantages in sensitivity or maybe dynamic range of a super regen? I know the primary advantage is component count and low power consumption compared to other technologies. I am wondering if one could be made with a LNA. I want to make a sorta hybrid SDR where the carrier amplitude and phase is sampled without going through a conventional ADC, basically using the super regen as the ADC.
Superregens are very sensitive and have a built in AGC action. But their performance when there are strong signals near your receiving frequency is terrible.
@@vk3ye yeah that makes sense, it can pull the center frequency right? My application is a TPMS receiver, than can demodulate OOK, PSK, FM. I want to put it on my vehicle, have it log all identifiers, timestamped along with my current GPS location. Then have it alert me if something appears to be following me, by doing some route analysis from open maps. Not out of paranoia but really just I never grew out of that childhood fantasy of being james bond.
Right now with a RTL dongle, 12 dBi antenna, 14 dB LNA, helical filter and gnuradio, I can reliably detect cars about 300 meters away but I want to improve this.
Interesting project Peter. I wonder how this converter would with your blue regen receiver
The blue regen receiver doesn't go up high enough in frequency.
Can that tuner handle high power if used as an antenna matcher say 100watts on 10/11 metre band ?
No. The 'tuner' is an RF converter, not an antenna matcher. It would not work at all.
@@vk3ye I know it is an RF converter but the insides must have a metal plate variable capacitor ?
@@nigelman9506 unfortunately not. Or at least anything suitable for 27 MHz.
@@vk3ye That's a shame, I thought it would be a good cheap source of tuning capacitors, they are over a £100 each, thank you for your feedback
You from????
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