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Author Topic: Why does the 10 meter band stop at 29,7 (and not 30mhz) ?  (Read 3153 times)
LB5KE
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Posts: 141




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« on: September 04, 2013, 03:20:10 AM »

I have never heard of anyone using the last 300khz.
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G3RZP
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Posts: 4713




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« Reply #1 on: September 04, 2013, 04:21:34 AM »

Pre WW2, it was 28 - 30 Mc/s. At the 1947 Atlantic City conference, the 29.7 to 30.0 band was allocated to FIXED and MOBILE (upper case means a primary allocation). About that time, a lot of use was made of that bit of the spectrum and that just above 30 MHz for what was effectively PMR use, just as a lot of Russian taxis use 10 metres today.

These days, that's still the allocation. I believe that band sees occasional use by the military.
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KU4UV
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Posts: 376




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« Reply #2 on: September 04, 2013, 10:05:33 PM »

I wish we still has some part of the 11 meter band!

KU4UV
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WB6DGN
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Posts: 619




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« Reply #3 on: September 05, 2013, 11:59:49 PM »

Quote
I wish we still has some part of the 11 meter band!

Hams have a sizeable allocation on 10m and one on 12m.  What is it that you think you can get from 11m that you can't get from 10m or 12m?  Or, is it just the fact that you WAAAANNTT it.
Tom
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G3RZP
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« Reply #4 on: September 06, 2013, 01:20:44 AM »

It isn't unknown for the MUF to creep up to 11m but not really get up to open the SSB part of 10m. 
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W6EM
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Posts: 812




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« Reply #5 on: September 10, 2013, 06:44:13 PM »

Quote
I wish we still has some part of the 11 meter band!

Hams have a sizeable allocation on 10m and one on 12m.  What is it that you think you can get from 11m that you can't get from 10m or 12m?  Or, is it just the fact that you WAAAANNTT it.
Tom

Relax, all of the CB manufacturers would stop us from taking away any of your spectrum.  Roger-beep?
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VK4KX
Member

Posts: 12




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« Reply #6 on: September 15, 2013, 12:58:24 PM »

I have never heard of anyone using the last 300khz.

I don't know if this is the actual reason, but there are frequency allocations in the Asia Pacific region in the 30Mhz frequency range.
When the MUF is high enough I hear Asians all up and down 30Mhz, and some are military in Thailand, and locally for me there are still the odd older style cordless hand held telephones that we don't listen in to. I will have to start a Youtube channel and post some of the video I have of the Asian chatter going on from 30 to 40Mhz even all over 10m for that matter. They even get into the 10m repeaters and create havoc. (watch this space for a future link)

Cheers VK4KX.
Bernie
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G3RZP
Member

Posts: 4713




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« Reply #7 on: September 15, 2013, 02:30:57 PM »

Look back to some of the US military radios of the WW2 and a while after: they were mainly, I believe used by military police and were in the 25 to 35 Mc/s region - using FT241 crystals.  It is believed they were even used in the Korean War. I think that is where it started - just as aviation VHF started in the band 108 to 136 in those days.

Tactical military is something like 30 to 88 MHz, although a number of chunks of the band don't get used except in operational situations.
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