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Author Topic: 11 meter ham band in the 1950's ...  (Read 1056 times)
WB9UAI
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Posts: 9




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« on: April 05, 2008, 01:21:19 AM »

... I collect local QSL cards from the past and just found one that states 25.7mhz in 1957. It's my understanding that hams lost 11 meters in 1959? What were the band limits and does anyone have any stories of using that band? Not much to be found on the web regarding this old ham band.

John K9RZZ
Milwaukee, WI
(ex - WB9UAI)
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K7UNZ
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Posts: 691




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« Reply #1 on: April 05, 2008, 07:03:38 AM »

Hello John....

Yeah, 11 meters went bye-bye for U.S. hams just about the time I got my novice ticket.

To be honest, I never thought it was that good anyway, as it was a "shared" band.  Everything from medical diathermy (sp?) to who know's what (hi).

It was used for remote control of model airplanes (ham ticket required back then....).

Actually, in my opinion, it's biggest claim to fame was the uproar caused by giving it to the CB service. But do keep in mind that in those days even CB required a license to operate.

I do have a copy of the FCC statement concerning the switch, and if you're interested I can e-mail it to you.

73, Jim/k7unz


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KB1LKR
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Posts: 1898




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« Reply #2 on: April 05, 2008, 07:33:26 PM »

Excerpted from: http://www.geocities.com/rf-man/cb/index.html

**********
    * 1947
      The Atlantic City Conference - Amateurs lose parts of 10 meters and 20 meters, but will gain a new band at 15 meters in 1952. To compensate for the loss, the FCC allows use of the 11 meter band (26.96 to 27.23 Mc) on a shared basis with Industrial, Scientific and Medical [ISM] devices. Class D radio for shared professional use introduced at 465MHz UHF but was too tricky for the time and didn't catch on. Doctors permitted to continue using 27MHz. [for diathermy]

    * 1948
      Firestone Tire Company granted experimental license W10XXD for 27.255MHz using two 3Watt transmitters.

    * 465MHz Class D service deemed a failure, the search is on for a replacement band.

    * Early 1957
      FCC Docket #11994 proposes reallocating Class D in the very underused 11 meters Ham band 26.96-27.23 MHz (USA-only). At this time there was little business/military use of 27MHz and model control on 27.255 was inadequate, being shared with paging and other services.

    * 11th Sept 1958
      The 11 meters ham band is reassigned to models and Class D Citizens' Band radio. The band is divided into 10kHz channels, the first channel bounded by 26.96 and 26.97 with the carrier frequency centered at 26.965 - and 27.225 being the last channel center - 27 channels in all. Models were allocated 5 new channel centers, 50kHz apart, the outer channels being 35kHz away from the band edges. 22 Class D channels were arranged around the model channels that later became known as channels 3A, 7A, 11A, 15A and 19A. The old model channel at 27.255 was allocated as a further 23rd Class D channel, a shared frequency that remains as the 6th model channel also. The Business Band above 27.23 couldn't yet be used for CB apart from channel 23 - the two-channel gap between 22 and 23 gave rise to pirate channels 22A and 22B...

My thanks (for info) to : The Wayback machine, Richard McCollum & Meg on rec.radio.cb, Retro-Dave (RetroCom 27Mc museum)), WoodyWorld CB pages, 'the author' of 'UK Bands'
**********

25.7 Mc would be a little too low for the shared 11m band, and, as you note, 1959 would be a little too late, at least in USA, 12m ends just below 25 MHz, plus wasn't allocated until about 1980, following ITU WARC-79, however there is an 11m AM broadcast band from 25.6 - 26.1 MHz -- perhaps it's a one way SWL QSL?

As to 465 Mc in the late '40's WHAT were they thinking!? 4m (72-75 Mc) -- now used for radio controlled planes/cars/boats/etc. -- might have been a better choice in that day and age.
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N4KZ
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« Reply #3 on: April 06, 2008, 07:57:57 AM »

As I recall, when the novice license was first implemented, its CW allocations were in the 80, 40 and 11 meter bands on HF and 2m AM phone. Later, 11 was withdrawn and novices gained 15m. Two meters was later withdrawn and novices gained 10m CW and later 10m SSB.

73, N4KZ
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NA4IT
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« Reply #4 on: April 09, 2008, 08:41:11 PM »

Something to think about...the CB band was given "the underused 11 meter ham band". Do you suppose this happened during a low cycle in the sun spots? We might want to get on 10M...even if it is just local!

NA4IT
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WB9UAI
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« Reply #5 on: April 10, 2008, 03:35:01 AM »

"Do you suppose this happened during a low cycle in the sun spots? We might want to get on 10M...even if it is just local!"

I agree, always make some noise. There is a fair amount of local activity around here even when the band is 'closed'. If I remember correctly, I've heard storys that 1957 was a phenominal year for 6m DX, so it was probably near a sunspot maximum.

??
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