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So I found these rules:

(2) No amateur station shall transmit from those portions of Texas and New Mexico that are bounded by latitudes 31°41 ′ and 34°30 ′ North and longitudes 104°11 ′ and 107°30 ′ West; or from outside of the United States and its Region 2 insular areas.

(3) No amateur station shall transmit from those portions of Colorado and Wyoming that are bounded by latitudes 39° and 42° North and longitudes 103° and 108° West in the following segments: 902.4–902.6 MHz, 904.3–904.7 MHz, 925.3–925.7 MHz, and 927.3–927.7 MHz.

But I can't find exactly what the government needs 30MHz of bandwidth for, especially in the middle of New Mexico.

What is the reason for this restriction?

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  • $\begingroup$ In the rules, note the 'other nations' part of the rule - have you checked what Mexico's allocations in that band are? $\endgroup$ – Jon Custer Jan 4 '16 at 23:15
  • $\begingroup$ Well why wouldn't they restrict Arizona also then? And this does not explain why Colorado and Wyoming are restricted as well. $\endgroup$ – Skyler 440 Jan 4 '16 at 23:36
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The New Mexico restriction covers the White Sands Missile Range. Colorado and Wyoming also have military installations. Some 900 MHz frequencies are allowed for amateurs there. More comments at http://www.qsl.net/kb9mwr/projects/900mhz/900users.html

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  • $\begingroup$ And you are correct, and my guess in a comment above was incorrect. Living a few hours north of WSMR I should have figured that one out (sigh). Agreements with Mexico are available on the FCC website at transition.fcc.gov/ib/sand/agree/mex_frequency.html and those don't show up in the table. KE5UCG $\endgroup$ – Jon Custer Jan 6 '16 at 15:24
  • $\begingroup$ Honestly we don't need 25MHz. Can't they give New Mexico a few MHz at least? I am in Colorado where they do have restrictions, but I am happy with what they give us. $\endgroup$ – Skyler 440 Jan 8 '16 at 5:59
  • $\begingroup$ @Skyler440 Last I knew, they were still testing EMP devices (among many other classified tests) out there. Keeping out of that whole 25MHz could be as much for our protection as their convenience if their EMPs are operating @ or near that band. I don't know about you, but I'd be seriously upset if I 'caught' one of those pulses while trying to rag-chew on UHF! lol $\endgroup$ – Robherc KV5ROB Feb 20 '16 at 13:06

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