Composite video via RF modulator, negative image?

'Snow' due to poor signal tends to be random noise - with the white parts showing more. And of course with a weak signal interference is more likely.

No. Wiki is in no way a reliable reference source.

Fine you win. You know everything, and everyone else in the world are morons.

Think about how long ago all the specs for RS-170 were laid down. *In the beginning* things were a bit more difficult, and synchronization was a bit tricky, what with marginally stable multivibrator oscillators and all. Using the highest-powered part of the signal for sync made things a bit easier. "Vestigal sideband" was used instead of true single-sideband because true SSB is more difficult to receive (since it needs a synchronous carrier). An interesting benefit of VSB is that for modulation frequencies near the carrier *where the sync signals are* the signal is standard double-sideband AM, which *doubles the amplitude of the detected signal* compared to the single-sideband part; this helps sync performance. Most of the lower sideband is wiped off on the way to the antenna, and the characteristics of the filter used must be carefully specified because there is a complimentary filter in every receiver.

In that case, you may have used some gear that I designed, or helped design, or managed the design of.

Isaac

A TV station that I visited in Fairbanks in the early '70s still used their vacuum tube RCA sync & chroma generator. The master monitor in the control room was based on the RCA CTC4 TV chassis, and the GE film chain was tube, as well. The equipment worked, but was very temperature sensitive. Bad tubes were a problem, as well. Some stations had over

Not to mention the careful alignment of the diplexer to allow the use of a single antenna.

I've worked with a Gates 500 W on Ch 8, a 130 KW Comark UHF on Ch 55, and a 25 KW RCA TTU-25B that I moved & rebuilt. It had been on Ch 55, and had to be converted for Ch 58. The RCA was built in 1952.

I've designed a few things for broadcast use, as well. We got a notice from the FAA & FCC about a change in the laws, regarding tower lighting. We had 72 hours to let them know if we already had a remote monitoring system in place, or buy one from an approved equipment list. I designed and built a system that day, and installed it the next morning. It used a1024 Hz tone on a spare audio channel in the STL from our old transmitter site, to the new one. A current transformer monitored current to the tower lights. The tone was on when the lights were off, and went off when all the lights were on. A tone decoder at the other end was mounted in the main console, with a small lamp beside the master monitor. It was just annoying enough for the operator to notice, and log the start & stop times each day. I designed and built a lot of interfaces to connect incompatible hardware, too. The most fun was transmitting a color station ID at a B&W AFRTS station with no color equipment, at all. :)