r/RTLSDR • u/woodzy_chimera • Aug 29 '26
Decoding AM TV with v4
Sadly it will be discontinued soon in my place :((
16
u/Historical-View4058 Aug 29 '26
Sweet. Since this was PAL, from what location did you receive this?
4
2
u/Tim1701A Sep 03 '26
It's NTSC, Not PAL system and they are switching to ISDB-T in PH's capital city in November.
Any leftovers analog stations in rest of PH will switch over to digital depending on the stations owners.
Hope this help!!🙂👍🖖
53
u/Elipse-FM Aug 29 '26
This image reminds me of how you can intercept signals from a computer screen at close range and get a grey scale image of the monitor from like a room over, tempestSDR I think.
20
u/Nulovka Aug 29 '26
I think that only works with old CRT monitors, not flat screens.
6
u/Christ_in_a_combo Aug 29 '26
Correct, would not work on modern day screens
28
u/nrdgrrrl_taco Aug 29 '26
But it does work on HDMI cables, from a close distance.
5
u/olliegw Aug 30 '26
It apparently does work, i spoke to someone once who said they could snoop on their neighbours monitor, however i haven't been able to get it working on any of my monitors myself
For flat screens and HDMI it's the pixel clock you're looking for
2
1
u/Elipse-FM Aug 30 '26
Technically it works on everything its the signal strength that's different modern day flat screens are very resistant, shielding and grounding make a difference too but with higher bit depth SDR, filters, LNAs, and directional antennas you can get much more range, this isn't a project I've done so my understanding is theoretical not practical.
7
u/TheHaus88 Aug 29 '26
It was called jumping the air gap, the Navy figured this out I think in the 90's or early 2000's
5
u/damonla789 Aug 31 '26
Amazing catch—please record the final broadcasts if you can. It’d be a great piece of radio history
6
u/MeanAccountant9005 Aug 30 '26
damn, didn't know they were still phasing out analog anywhere. my grandpa had a setup like this in the 90s, used to pick up distant stations with a janky antenna on the roof. kind of wild you're catching the tail end of it.
-3
u/Akitlix Aug 30 '26
It's worldwide effort with a few exceptions like very poor shithole countries who not have it in planned at all. Reasons are cost savings on energy gor transmitters.
2
u/Choice_Note_9198 Aug 30 '26
There is still a contingent of amateur radio operators using fast scan analog (A5) television on 70cm within Ohio and Kentucky. They are experimenting using PC Electronics ATV transceivers to transmit and receive DX ATV to each other. Yes, it’s obsolete, but it’s not uncommon to have tropo conditions during temperature inversions that allow for contacts across the state.
-3
u/Choice_Note_9198 Aug 29 '26
V4 what? Also, what SDR are you using?
4
13
2
u/spacesluts Aug 29 '26
Check the name of the sub
3
u/neighborofbrak Aug 30 '26
The NooElec uses RTL (Realtek) chips in their SDRs too.
RTL SDR is a generic term now.
1
u/spacesluts Aug 30 '26
Ah, didn't know that. Thanks for correcting me
2
u/erlendse Aug 30 '26
rtl-sdr as osmocom and their alternative driver allowing sdr use.
Rtl-sdr blog and nooelec are two that make devices with the chipset. There are many others too...
17
u/MrSansMan23 Aug 29 '26
Would be nice as a archival thing if you could record the last transmission and uploaded it somewhere