GE-BT-11-B1
[from fun91 discussion group:]
Edward O'Brien: Harold ... do you have any mementos (pictures-manuals-parts)of KCPR's original transmitter, the 3/4 watt G.E. Phasetron?
Frank Calabrese: Was that thing only 3/4 watt? The joke was that it was 1.8 ERP because of line loss,starting at 2 watts. The non-technoid types figured that the signal picked up speed as it went downhill.
Edward: I think I found KCPR's first transmitter....well, maybe its cousin. I think the guts of this thing looks real close. The Phasetron tube is under the cover toward the right side of the bank of multipliers. As I recall the phasetron operated in the mid to high Khz range, then the signal was multiplied up to FM. Needless to say, stereo was not an option with this rig. According to the specs this was a 10 watt rig, but as I recall KCPR's was much less, and I think the original antenna was circular polarized, single bay, but not sure ... Harold explained the theory of this thing to me when I was a new freshman.
Edward O'Brien: Harold ... do you have any mementos (pictures-manuals-parts)of KCPR's original transmitter, the 3/4 watt G.E. Phasetron?
Frank Calabrese: Was that thing only 3/4 watt? The joke was that it was 1.8 ERP because of line loss,starting at 2 watts. The non-technoid types figured that the signal picked up speed as it went downhill.
Edward: I think I found KCPR's first transmitter....well, maybe its cousin. I think the guts of this thing looks real close. The Phasetron tube is under the cover toward the right side of the bank of multipliers. As I recall the phasetron operated in the mid to high Khz range, then the signal was multiplied up to FM. Needless to say, stereo was not an option with this rig. According to the specs this was a 10 watt rig, but as I recall KCPR's was much less, and I think the original antenna was circular polarized, single bay, but not sure ... Harold explained the theory of this thing to me when I was a new freshman.
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on 2007-Oct-02 19:43:26 Len Filomeo said
Lou Rinaldi was telling me at the pool party that KCPR originally had a construction permit for up to 10 watts. That would have essentially been a permit to build a Class D NCE-FM station. Then they were able to obtain the 2 Watt GE Phasetron from KCSB. They also had a single-bay, horizontally-polorized Jampro V antenna with a field gain of 0.9. The product of the 2 Watt Phasetron and the single-bay antenna yeilded 1.8 Watts. So KCPR filed for a license for 1.8 Watts. Whether the GE actually made that 2 Watts of power was apparently in dispute.
Because Class D FMs like KCPR were all protected as 10 Watt stations, KCPR was able to spontaneoulsy increase power to 10 watts with the Visual DFM-10B transmitter and only had to file a change of status with the FCC to upgrade the station license to 10 Watts.
