purpledevil said:
Talking to an oldtimer yesterday, I was told something I never had heard before. According to him, KTRH originally signed on at 1120 kilocycles, as opposed to its current dial setting of 740. Now I knew that KPRC originated at 920 and changed to 950 in the great frequency change of '41, but this 1120 is news to me. Wouldn't that have caused trouble for WTAW 1120 in College Station,(Original setting for WTAW before '41) with its close proximity to the Houston signal? Is there somewhere that this info is readily available on the i-net or can someone confirm this?
There wasn't supposed to be any interference since WTAW and KTRH weren't supposed to be on the air at the same time -- if one station was operating, the other was supposed to be off, and vice-versa. See
http://members.aol.com/jeff99500/1934am.html which indicates the two stations shared time on the 1120KHz frequency.
Timesharing is pretty rare today -- offhand I can only think of one set of AM stations (and two sets of FMs) sharing time -- but it was quite common years ago. I can find six sets in Texas alone in the 1934 list. (one of the most interesting showing KRLD sharing time on 1040 with KTHS, the Hot Springs, Ark. station that is today KAAY-1090; and with a WESG in Elmira, New York...)
"...wasn't
supposed to be any interference...", because from what I've read in
http://www.wisc.edu/wisconsinpress/books/3835.htm Randall Davidson's fantastic history of the University of Wisconsin's WHA, commercial stations often felt free to ignore the terms of timesharing agreements with educational-institution stations. I don't know that KTRH would have violated its agreement with WTAW, but it's quite possible.
After World War II, quite a few stations moved from lower-power regional and local channels to high-power operation on Canadian (and Mexican) clear channels, using directional antennas. The 730 channel (which moved to 740 in the big 1941 shift) had
no stations in the US in 1934 - the major US stations using it today moved from elsewhere:
- KCBS, San Francisco: from 1010 (where it was KQW)
- WQTM, Orlando: didn't exist until 1947
- KRMG, Tulsa: from 1949
- KTRH, Houston: from 1120
This of course allowed breaking up a bunch of timesharing situations.