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WENO was on all night.
- Thread starter CDG
- Start date
I don't think WENO can be on all night because WNSR uses that tower and transmitter at night for 560.
That really has no bearing on things, if properly engineered, WNSR and WENO could use the same towers at the same time.
"If" is doing a lot of work there.
If you have a straight daytimer sharing a tower with a night-only operation, all you need is an antenna switch. Station D or Station N feeds the antenna system and whichever station isn't on the air is isolated from the system.
As soon as they're both operating at once, it's a diplex. Now you need filters and combiners so one transmitter isn't backfeeding the other, and you need ATUs that are set up for diplexing.
So, yes, it actually does have a lot of bearing on things.
Towers can be used for two, three and even four AM signals, day or night.
WNSR and WENO do not share transmitters. One is on 560 with its own transmitter and the other is on 760 with a different transmitter. You can't just move a transmitter from one frequency to another unless they were designed to be frequency agile, something American stations don't buy for medium wave operation (it was commonly used in the past for short wave where frequencies change at different times of the day).
As to sharing a tower, as fybush says, you need a combining and rejection network. Each station has circuitry that tunes it to the tower and additional circuitry to prevent the other station(s) from feeding back into its transmitter. Then, the combined signals are fed to the tower.
Look at the first photo at David Gleason adds more stations in Ecuador and you will see me in front of a tuning unit that allowed one tower to be used by HCTM-570 and HCFV-805 in Ecuador in 1966. The technology today is pretty much the same except that we design with computers and not slide rules.
There is a bit more to this than my simple explanation such as the power handling abilities of combiners for stations of different output powers and the like, but the fact is simple that WENO and WNSR don't share a transmitter and both can run at any authorized time as long as the combiner/rejection networks are designed correctly.
But each station needs a separate ATU circuit to tune it to the tower itself as the characteristics (impedance and reactance) of a single tower are going to be different at each frequency.
And each station needs a separate ATU to match its frequency with the tower. .
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