T O P

Why was Channel 3 and 4 rarely used on North American analog broadcast TV?

Why was Channel 3 and 4 rarely used on North American analog broadcast TV?

Teekno

They were commonly used. But it was very rare for someone to live in an area where *both* channels were used, since the FCC would spread the channels around to avoid interference.


thenebular

Ok, now we're getting somewhere.


Putrid_Employment281

Which is why there was usually a selector switch to choose 3 or 4 on the device.


katiebear716

it was rare that they were both used for the same area. this was intentional so you could hook up your other electronics and to avoid overlapping signals.


i80west

Channel 3 was used in Omaha. It's used in Boston.


Yerm_Terragon

These reasons probably went pretty hand-in-hand with each other


Wageslave645

Channel 3 and 4 were mainly used as modulators for consumer devices were cheaper to make and more stable at ~60 Mhz than they were at ~400Mhz. They also did not use Channels 2,6,7, and 13 as there was a risk of interference to radio bands adjacent to those channels if there was RF leakage or secondary harmonics.


thenebular

Every one of those channels were used in the 80s and 90s in the Toronto area.


Wageslave645

They weren't used for RF modulators for those reasons. They were assigned to TV stations as they have better control of their RF emissions than a consumer device.