BBS:      TELESC.NET.BR
Assunto:  Re: SDF
De:       Rug Rat
Data:     Fri, 3 Apr 2026 15:18:01 +0000
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 LOL.  So we can keep this somewhat on Aviaition (before we get yacked at for being off topic...)...

  I was thinking of a snarky (I believe sarcasm makes the world go round) way to not only comment you are using the old Mc/s unit, but said 423Mhz was VHF...

  This made me think of a "discussion" I had at the aviation school I work at.  He called the 220Mhz aviation band UHF.  

  VHF is 30Mhz to 300Mhz
  UHF is 300Mhz - 3Ghz.

So 220Mhz would still fall in VHF, though he would bet his life that it was part of the UHF spectrum, even when I pointed out that everything on the interwebs agreed with me.

So I went home pondering this, and then looking at it on paper it dawned on me what they did, and why they do it.

"VHF AM Phone" band encompasses 118 - 137 Mhz and is open for CIVILIAN use.
"UHF AM Phone" avaition encompasses 225Mhz - 400.00Mhz.  Even though 225Mhz is clearly in the VHF Range, and is for MILITARY and GOVERNMENT use only.

They are used VHF and UHF not to deliniate the freq. spectrum, but use.  It is much easier to tell someone to GO TO Uniform BLAH BLAH BLAH, they say go to VHF hi...   Work load is high, so keep it simple. Since 220 and above are probabbly on the same raido, it makes it even simpler.  I don't have to rememeber that 220Mhz is on the UHF radio.).

So we were both right...  He was just coming at it from the operational side and I was looking at it from the technical side..

Rug Rat (Brent Hendricks)
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