Memories. When I was about 12 in 1962 I once cleaned the contacts on the tuner channels before my father got home from work. (He had told me not to touch the TV.) I couldn't stand seeing him bang on the rabbit ears every evening when the whole problem was dirty contacts on the tuning coils in the tuner. After cleaning, the TV went from 3 intermittent channels to 5 clean channels and one on the fringe. My dad thought that his banging on the rabbit ears finally fixed the TV.
Very useful experiment Peter. At 45:11 minutes you appeared to tune in a Telemetry beep beep signal just below the Narrocast Station on 151.450Mhz. The ones used to track animals for study purposes. These are low powered and the source should not be far from your home. Get a yagi out, FT817 and fox hunt its location!!!
Very interesting video, i've been tinkering with analog TV's and radios for many years, but never thought you could use a VHF or UHF TV tuner as a wideband receiver, you've definitely inspired me to give it a go sometime........
That looks like fun. Now I've got to go rummage through the junk boxes. (Thumbs up if you'd like to see Peter McGiver up a spark gap transmitter using the HT flyback transformer from an old CRT TV? For educational purposes only, of course.)
I think - this tunner + pulse counting FM receiver circuit is a good AM, FM, NFM receiver. I used pulse counting FM receiver circuit for NFM receiver on 420-430MHz band. ( police, fire brigade, medicine ).
You can use the later variable resistor types if you have a 33V regulated supply (grab the shunt regulator IC from the TV set main board, it is a pretty good regulator) and run around 1mA of current through the regulator to get 33V tuning. They do have slightly better sensitivity, lower drift though might need a few more supplies, and as a bonus also give a signal strength indication as well, normally used in the TV set to mute audio between stations. The later digital ones though need either a PWM drive, or are programmed over I2C bus entirely.
Memories. When I was about 12 in 1962 I once cleaned the contacts on the tuner channels before my father got home from work. (He had told me not to touch the TV.) I couldn't stand seeing him bang on the rabbit ears every evening when the whole problem was dirty contacts on the tuning coils in the tuner. After cleaning, the TV went from 3 intermittent channels to 5 clean channels and one on the fringe. My dad thought that his banging on the rabbit ears finally fixed the TV.
Very useful experiment Peter. At 45:11 minutes you appeared to tune in a Telemetry beep beep signal just below the Narrocast Station on 151.450Mhz. The ones used to track animals for study purposes. These are low powered and the source should not be far from your home. Get a yagi out, FT817 and fox hunt its location!!!
Very interesting video, i've been tinkering with analog TV's and radios for many years, but never thought you could use a VHF or UHF TV tuner as a wideband receiver, you've definitely inspired me to give it a go sometime........
Nice video
Another cool vid, found all sorts of cool sigs 👌 thanks
That looks like fun. Now I've got to go rummage through the junk boxes.
(Thumbs up if you'd like to see Peter McGiver up a spark gap transmitter using the HT flyback transformer from an old CRT TV? For educational purposes only, of course.)
Great tutorial on technology, and frequency allocations. I liked playing w/ the old,, Varactor tuned UHF tuners that covered 470-902 MHz(US).
thank you peter
Great video, thoroughly enjoyed! (and the interlacing is appropriate for the topic too!)
I think - this tunner + pulse counting FM receiver circuit is a good AM, FM, NFM receiver.
I used pulse counting FM receiver circuit for NFM receiver on 420-430MHz band. ( police, fire brigade, medicine ).
You can use the later variable resistor types if you have a 33V regulated supply (grab the shunt regulator IC from the TV set main board, it is a pretty good regulator) and run around 1mA of current through the regulator to get 33V tuning. They do have slightly better sensitivity, lower drift though might need a few more supplies, and as a bonus also give a signal strength indication as well, normally used in the TV set to mute audio between stations. The later digital ones though need either a PWM drive, or are programmed over I2C bus entirely.
Varactor tuned. Yes more stable than the old mechanical tuners :)
The 40:44 point, those channels are pretty much gone digital. The trunk network thou, still is alive and kicking. Listen to it on a daily in the car.
Very good performance on Rx, would it be possible to Tx on it?
Not easily.