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One other development at the NARTB Convention will no doubt produce a great deal of comment. It is the proposal by FCC Commissioner Robert E» Lee for a realloca¬ tion of the spectrum between £0 and 890 megacycles. Commissioner Lee read his pro¬ posal at the Thursday (May 26) morning session of the Broadcast Engineering Confer¬ ence held in conjunction with the NARTB convention. He wished it made clear that this is not an official FCC proposal but is his own thinking on the matter. This reallocation would provide hi television channels, six megacycles wide between 60 and 3i;2 megacycles. It would delete only Channel 2 of the present VHP bands and include all of the present high band VHF channels (7-13). It would move the present FM band (88-103 me) to the top of the TV channels giving FM 3i|2 to 362 me. It would also mean moving military, aeronautical mobile and navigation, amateur, land-mobile, and government non-military channels. Commissioner Lee stated that this was a long range project that might take as long as 1$ years to complete * Most of the comments we heard were favorable. The reallocation would bring all TV into the VHF band. Due to ease of design of TV tuners, it might decrease the cost of all-band TV sets considerably. By proper choice of channels, some space mi gut be found immediately although the complete change would take time. This plan if accomplished might well take care of television needs for the next 100 years as well as providing better transmission for the mobile services by moving them to the SU to 60 me band. Spectrum space of the entire UKF TV band would become available for reassignment. ICONOSCOPE FILM CAMERA MODIFICATION* Many stations using iconoscope film cameras and slide changers which douse the lamp when slides are changed may have experienced the same sort of trouble that we have here at KQED. During periods of slide change, an audibile 60 cycle hum was noticed in many receivers. After considerable experimenting it was finally found that same was caused by the extreme change in level of black and white content and the sudden change from a slide with large white content to total black during slide change. This condition was finally licked and brought about two favorable conditions: first it entirely eliminated the 60 cycle hum during slide change, and second was much more enjoyable to watch on the receiver as there were no great changes in contrast and no retrace lines visible during slide changes as so often is the case. The above condition was eliminated in the following manner. A piece of zip cord was connected from the slide changer rotating motor to two a s c. sockets mounted on the base inside the film camera as close to the front as possible, and two ho watt lamps installed in same* As the slide projector lamp is doused and the rotat¬ ing motor starts, the zip cord leads which are in parallel with the rotating motor leads, will light the two UO watt lamps and thereby keep a fairly even light on the mosaic of the Iconoscope tube. Lamps of different wattage may be tried but in our particular case the hO watt type proved most satisfactory. ^'Contributed by Lariy M. Reed, Chief Engineer KQED, San Francisco, California,