Amateur Radio questions

[KB7MIB]

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a) What is 146.600 "allocated" for? It's not listed in the AZ 2M bandplan the last time I checked.
b) Why doesn't AZ standardize the 70cm repeater inputs/outputs, either high in/low out, or low in/high out, like most other states do? AZ has a mixture.

 

[popnokick]

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Ask this group:
http://www.azfreqcoord.org

 

[KB7MIB]

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Yea, that's where I got the 2M Bandplan from. (The rest of the bandplans are pdf only, and my phone won't do pdf, so I can't look at those.) If no one here knows, and since I've asked elsewhere before, I'll just have to ask them directly

 

[msa]

1) Think of it as the guard band between the simplex channels, on 20 khz centers, and repeater pairs. You'll note that the ARRL bandplan looks like that too, as do many neighboring states. (Look at UT, CO, NM.)

2) Sometimes there's a benefit to using the reverse pair, if you're worried about, say, an adjacent channel.
Demanding a single offset reduces flexibility and doesn't really buy us anything -- any radio that understands a 5 mhz repeater offset understands + or - just as well.

But the simple answer is:

Because the repeater owners in the state, mostly clubs, are ARCA members, and through their membership in ARCA, have not voted for it.

 

[KB7MIB]

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Ok, thanks. I suppose 146.600 could be used for FM simplex, as it's not specifically prohibited, and you can operate simplex almost anywhere in the FM portion, like it says on the 2M bandplan webpage, as long as you're not causing interference to anyone.

 

[msa]

I wouldn't, unless it's narrowband.

The outputs start at 146.61; 146.60 is unallocated to provide a little space (guard band) between the simplex users on 52/54/56/58 and the repeater outputs on 61/63/65/etc.

 

[mercwayn]

whats a good scanner to start with

 

[KB7MIB]

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I was referring to in Arizona, as simplex and repeater allocations are both on 20kHz channels. 146.460 Remote Base; .480 Simplex; .500 Echolink/IRLP Low Level Simplex; .520 Calling; .540 Simplex; .560 Simplex; .580 Echolink/IRLP Low Level Simplex...

 

[KB7MIB]

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146.600 Unallocated; .620 Repeater Out: .640 Repeater Out; .660 Repeater Out, etc. up to 147.380 Repeater Out. Then the digital repeater outputs on 147.400/.410/.420/.430/.440 (inputs - 1 MHz). Then more Echolink/IRLP and regular simplex from .460-.580.

 

[msa]

Even then, centered on .60 and allowing for some drift, you'll be up to .6125 (and a repeater on .62 easily extends down that far.)

Not a huge amount of overlap, just the skirts, but enough so that I wouldn't use it. Remember, you've also got .480.

I've never seen all of .52/54/56/58 and .48 in use.

 

[KB7MIB]

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20 kHz would be 20 kHz, regardless if it was an adjacent simplex channel or an adjacent repeater output, wouldn't it? I wouldn't think that a simplex user 20 kHz away would cause any more interference than a repeater pair 20 kHz away, especially on an HT.

 

[KB7MIB]

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I'm not trying to be argumentative or anything. Just asking questions I'm curious about it, and from what (I think) I know, it wouldn't seem to be a problem.

 

[msa]

Assume that your signal extends plus or minus 11-12 kHz. That applies to the repeater, as well. Skirts of both overlap, even at 20 khz spacing (but it isn't usually a problem.)

Where it will be a problem is when you run into the coordinated repeater on .61 -- it's got pretty wide area coverage in the eastern portion of the state.

If you stayed well away from Greens Peak, Tucson, and Yuma, you could probably use it simplex. The question is why would you want to? We've got enough simplex frequencies allocated on 2m.

 

[KB7MIB]

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I wasn't aware of a allocation on .610, in which case, I'd avoid the use of .600 in it's coverage area. Not that I've ever used it, or even planned to. I was curious about it, as I said, and I'm asking questions due to my curiosity. That's all this is.