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Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
I got reception on my first try today, from my very first radio project! Lot's of noise and only two signals found so far over the entire band, but it's a start. The TV tuner is of the old analog type, which I harvested from a miniature TV. Being analog it has it's ups and downs. I never quite know where I am in the radio spectrum, nor can I really fine tune the receiver. I assume the one channel I found is a local FM station, since it's playing music and in the TV tuner's 45-180MHz VHF range. I haven't optimized the local oscillator yet, so once I get it closer to 27,3MHz I assume reception will improve. Any progress from your corner, Erlend^SE?
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
UVE33-EW51, it also has 9438M on it though that might be a production serial. I haven't found anything useful on it, but fortunately the pins were labeled. I've tuned the local oscillator and acquired a much cleaner voltage supply, both of which have improved sound quality considerably. I can now get most of the FM stations, and one station somewhere in the UHF band which seems to be sending binary. Not much to hear after TV broadcasting went digital I'm afraid. I'd like to find a digital tuner instead of this analog one. My current one seems to use non-standard bands and I'm not sure how high the tuning voltage can be set either, given it came from a 12V TV.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Alright, I've finished designing the 38.9MHz receiver portion and made a PCB for it. Reception is much better and I can get in all sorts of signals sources now that I couldn't before. The neatest part about this project, is that besides some capacitors and resistors (and the SAW filter), everything I used is from the cheap radio I disassembled. Here's my final schematic for reference.
This radio is awesome to have if you want to make those little FM radio bugs. No more need to look for empty radio space on the FM band, now you have VHF and UHF! Legalities aside of course.
Registered Member #575
Joined: Sun Mar 11 2007, 04:00AM
Location: Norway
Posts: 263
omgPWNz0r uzz0r.. This is real cool. Me and Erlend^SE is working on something similar but it is going to be µC controlled and SMD (as far as we can get it)
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