The "Wayback" - #10 In our last installment, we learned that the "UHF" spectrum above 25 Mc., which during the 1930s was populated only by amateurs, was now in the center of a battle being fought on many fronts. Amateurs wanted their 10, 5, 2-1/2, and 1-1/4 meter bands back. Major Edwin Armstrong wanted to increase the 42-50 Mc. allocation in the new FM broadcast service. General David Sarnoff of RCA wanted huge chunks of VHF space set aside for television, as well as limited spectrum for FM, a potential rival. And William Paley of CBS wanted UHF -- not VHF allocations for CBS' "color wheel" TV system, which they wanted the FCC to adopt as the television standard, in lieu of RCA's competing system. In addition to these major players, other minor characters were also clamoring for VHF frequencies -- the growing aircraft industry, police departments who were tired of the interference-prone 1700 kc. police band and wanted to use FM on vhf -- and even businesses to whom the idea of personal two- way communication was now possible. Thanks to the war and the introduction of new VHF and UHF tubes, the frequencies above 25 Mc. were now the most sought after slice of the RF spectrum. During late 1944, the FCC held hearings on post-war VHF allocations, in which there were 231 witnesses and 4200 pages of testimony. In November 1944, the first proposal on VHF/UHF allocations was released. See if you could have lived with it... 23.5-27 Mc. -- Industrial Applications 27-29 Mc. -- Amateur 11 Meter Band (yes, that's right!) 29-43 Mc. -- Police, Fire, Emergency, and Local Government 43-58 Mc. -- FM broadcasting 58-60 Mc. -- Amateur 5 Meter Band (note only 2 Mc.) 60-102 Mc. -- TV channels 1-7 (the RCA system) 102-108 Mc. -- Non-government Emergency 108-132 Mc. -- Aircraft 132-144 Mc. -- Government 144-148 Mc. -- Amateur 2 Meter Band 148-152 Mc. -- Government 152-218 Mc. -- TV Channels 8-18 (yes, up to channel 18 and again, the RCA system) 218-225 Mc. -- Amateur 1-1/4 Meter Band 225-420 Mc. -- Government 420-450 Mc. -- Amateur 70 cm Band 450-460 Mc. -- Facsimile Broadcasting 460-956 Mc. -- UHF Television using the CBS color wheel system So, under this proposal, our 10 meter band was moved down 1 Mc., we would lose 1/2 of our 5 meter band, we lose 112-116 Mc. but gain 144-148 Mc., our 1-1/4 meter band stays the same, and we gain a large chunk at 420 Mc. The FM broadcast allocation is increased by 85%, police agencies leave the crowded medium wave area for VHF-FM, aircraft has their piece of the pie, and both CBS and RCA have home turfs to battle out the TV standards war. Note also the 450-460 Mc. range allocated to "Facsimile Broadcasting." For those of you who think FAX machines are a recent invention, it may interest you to learn that 60 years ago, a reliable mechanical-electrical FAX system was in use. By the mid-1940s, it was widely believed that every home soon would have a FAX machine. During the night, as you slept, the machine would be tuned to various stations in the 450-460 Mc. range and would print out the next day's newspapers, magazines and catalogues, for you to read in the morning. Another proposal was for a "Veteran's Band", which would be a 2000 Mc.-wide slice of the spectrum above 10,000 Mc. This proposed band would be available for war veterans (and ONLY war veterans) in any way they desired. The ARRL was quick to object to the proposed allocations. It was not acceptable to amateurs to move our 10-meter band down 1 Mc., to eliminate 50% of 5 meters, and to upset the harmonic relationship of our bands by moving us from 112 up to 144 Mc. The FCC capitulated on 10 and 5 meters, as we will see in a moment. As for the 144-148 Mc. band -- the FCC was firm. 112- 116 Mc. was going to aircraft. Furthermore, the FCC wanted our amateur bands above 100 Mc. to be next to government allocations, so that in time of war or national emergency, they could be used for the expansion of essential governmental radio services. The needs of the government, per the FCC, outweighed the need for a strict harmonic relationship between the amateur bands. Meanwhile, while the ARRL was arguing over our allocations, General Sarnoff was conducting his campaign behind the scenes. He couldn't eliminate the CBS color wheel UHF system because, at that time, CBS was producing beautiful, lifelike color pictures that impressed the FCC. But he could attack FM. A big deal was made out of the claim that FM broadcasting needed to be moved higher in the VHF range to eliminate interference caused by Sporadic-E skip. Sarnoff, of course, wanted these frequencies for TV. He never explained, and no one seemed to ask, how TV would not be affected. In fact, TV, with it's amplitude modulated video signal, would be more susceptible to "E" skip than FM with its capture effect. RCA however had power, money, and influence, and Major Armstrong found he was no match for the corporate giant. On January 15, 1945, the FCC issued a revised allocation proposal: 25-28 Mc. -- Fixed, Mobile, Industrial, Scientific and Medical 28-30 Mc. -- Amateur 10 Meter Band 30-44 Mc. -- Police, Fire, and Various Governmental Allocations 44-50 Mc. -- TV Channel 1 (now you know where it was!) 50-54 Mc. -- Amateur 6 Meter Band 54-84 Mc. -- TV Channels 2-6 84-102 Mc. -- FM Broadcasting 102-108 Mc. -- Possible Facsimile Broadcasting 108-132 Mc. -- Aircraft 132-144 Mc. -- Government 144-148 Mc. -- Amateur 2 Meters 148-152 Mc. -- Government (note 2 meters sandwiched between two government bands) 152-162 Mc. -- Police, Fire, and Other Local Government 162-170 Mc. -- Government 170-180 Mc. -- Navigational Aids 180-216 Mc. -- TV Channels 7-12 (note that TV only gets 12 channels here) 216-220 Mc. -- Government 220-225 Mc. -- Amateur 1-1/4 Meter Band 225-420 Mc. -- Government, Including Military Aircraft 420-450 Mc. -- Amateur 70 cm Band 450-460 Mc. -- Air Navigation 460-470 Mc. -- A New "Citizens' Band" (which would eventually evolve into Class A and Class B CB, then into GMRS and the new FRS) 470-480 Mc. -- Facsimile Broadcasting 480-940 Mc. -- Experimental TV (for the CBS system) Yes, this proposal sounds a lot like what we have today, but the battle was only beginning. Major Armstrong was not giving up on an FM band in the 43-58 Mc. area. He didn't want the thousands of FM receivers and dozens of stations now on the air to suddenly become obsolete. CBS was still convinced that UHF was the place for TV, and their system was the best. During the first half of 1945, the battle would rage with many more proposals to come forth. Join us next time as "The Wayback Machine" continues to watch this epic battle. Get the Text Version of Wayback #10 Wayback Machine - #1 #2 #3 #4 #5 #6 #7 #8 #9 Back to the Hudson Loop © Copyright 1998 by the Hudson Communications Foundation, Inc. All rights are reserved.