You most likely know this already, but I'll post it anyway, just to add to your message.
Our Air Broadcast VHF - UHF stuff for Television and Commercial FM radio goes as follows:
VHF Lo Band [54 to 108 MHz]:
54-60 MHz = TV Channel 2,
60-66 MHz = TV Channel 3,
66-72 MHz = TV Channel 4,
72-76 MHz = Special Services [VHF service, possibly Police, Fire, Railroads, Etc.],
76-82 MHz = TV Channel 5,
82-88 MHz = TV Channel 6,
88-108 MHz = Commercial FM Radio Broadcasts.
VHF High Band [174 to 216 MHz]:
174-180 MHz = TV Channel 7,
180-186 MHz = TV Channel 8,
186-192 MHz = TV Channel 9,
192-198 MHz = TV Channel 10,
198-204 MHZ = TV Channel 11,
204-210 MHz = TV Channel 12,
210-216 MHz = TV Channel 13.
UHF band range is 470 MHz for beginning of TV Channel 14, to 890 MHz for end of TV Channel 83. Each UHF Channel occupies a typical 6 MHz bandwith.
For a typical TV Channel listed above, the AM Video Signal's carrier frequency is 1.25 MHz from just past the "Channel's Edge". It covers about 4.0 MHz of bandwidth. The FM Audio Signal's carrier frequency is about 0.25 MHz from the other "Channel Edge". The FM Carrier is 4.5 MHz from the AM Carrier. FM covers aproximately 200 KHZ [0.20 MHZ] in total sidebands, so the entire Audio Envelope has a good 200K of sound area.
The real bandwidth hog is the AM Video signal envelope!
In the receiver, for Monochrome [Black and White], the composite video signal at the RF amp [RF signal and Oscillator signal heterodyned] = 45.75 MHz.
Scanning at the CRT =
525 lines horizontal [212.5 for odd, 212.5 for even - common interlace] Horizontal frequency = 15,750 Hz [525 lines x 30 Hz].
Vertical oscillator frequency = 60 Hz.
Vertical = Sawtooth waves, Horizontal = Square waves or pulses.
In a Color set, the Horizontal Frequency is less than 15,750 Hz. It's been a long time since I covered TV stuff - especially Composite RGB [Color], so I'll need to grab the books and do some refreshing!!!
The Commercial FM Radio Channels Data is something like:
IF Frequency = 10.7 MHz [both Mono and FM Stereo],
Bandwidth = 30 Khz [Mono], 150 Khz [Stereo]
Spectrum = 88-108 MHz [VHF low band].
And just for the heck of it, Commercial AM Radio is:
Spectrum = 540 Khz to 1600 Khz,
IF Frequency = 262 Khz or 455 Khz,
Bandwidth = 10 Khz.
My dislikes of AM broadcasts are the extremely limited bandwidth [10 K for sound is too dang midrange for me!], and the way receivers love to pick up Atmospheric, Natural and Man-Made noise big time and deliver those signals to the RF Amp as info!
Not sure of DBS, CATV type Commercial Cable TV Broadcasts, or the newer "XM" DBS Audio, so I'll do some searching here and there.
Got any leads???
I memorized the VHF - UHF Spectrums from countless custom Parasitic Yagi Antennas projects, plus bandpass filters to block neighboring HAM Radios from stepping so hard on our signals, they would get cross modulated horribly - sometimes the video signal got pushed away completely!
Most of the time, the interference was just simple Herringbone on TV 2, 4 and 5.
But when the guy next door fired up the 10 KW 30 MHz Radio set, that's when watching any TV Channel was futile!
This was kind of fun! [what a life I lead when this is fun stuff, huh
]. Glad you posted this topic!