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(AM) Different Day and Night Frequencies

kfbkfb

kfbkfb

IIRC, an AM station in Canada used one frequency for daytime hours and another nearby frequency for nighttime hours (I don't recall the specifics - call letters - why this was done).

Was/is this done elsewhere in the World (if so, why)?


Kirk Bayne
 
I remember one in Leamington ON in the 1970s that was on 710 during the day and 730 at night (or was it the other way around?). IIRC, it used a different call for each frequency -- CHIR and CHYR ring a bell, but again, I don't remember which was which. I would guess that it's long since moved to FM.
 
And there was the (in)famous WFAA/WBAP arrangement in DFW, when one operated on 570 and the other on 820, switching back and forth. IIRC, that was ended circa 1972, with WFAA staying on 570 and WBAP on 820.
 
IIRC, the day/night freq diff was 10 or 20kHz (same call letters) , seems overly complicated (from a tech and advertising perspective), just move the whole station to another freq and stay on that 24/7.


Kirk Bayne
 
kfbkfb said:
IIRC, the day/night freq diff was 10 or 20kHz (same call letters) , seems overly complicated (from a tech and advertising perspective), just move the whole station to another freq and stay on that 24/7.
Click to expand...
CHYR began as a daytimer in Leamington, Ontario, and on its day frequency it could not run at night due to protection requirements. The night channel would not allow daytime operation, so they used the two separately.
 
Cordelia Chase said:
This is interesting to me as I've never heard of such an arrangement before. Just like kfbkfb, I also would like to know why.
Click to expand...
WFAA and WBAP each shared the 1-A clear channel and the regional channel... it was a compromise as both wanted the priority clear channel.
 
Correct on 710/730 arrangement for Leamington
Currently we have a Detroit metro ethnic station which is 690 days, 680 nights
 
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