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  #21  
Old 01-20-2012, 03:39 PM
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YES! YES!!

I want to talk about how 70CM propagates in canyons compared to 2m. Maybe the topic for a different thread? I had a nice conversation about it with Nathaniel at Blue Notch last year and am thinking maybe we should switch freq's when we are in tight terrain? at least try it once?
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  #22  
Old 01-20-2012, 03:54 PM
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I have been thinking the same thing Marco, but have never actually tried.
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  #23  
Old 02-01-2012, 07:19 PM
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Are there simplex channels on the 70cm band?
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  #24  
Old 02-02-2012, 05:36 AM
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Quote:
Originally Posted by dr350jja View Post
Are there simplex channels on the 70cm band?
For Colorado:
http://www.ccarc.net/images/CCARC_FU...50MHz_revd.pdf

This should be similar most places AFAIK, I don't think there's any band plans that use other than 5MHz splits and 25KHz spacing for analog voice.

There are 24 simplex FM, 119 5MHz repeater pairs, 59 aux 5MHz repeater and whole bunch of narrow band (digital) 12.5KHz simplex, pairs and data. There is 30MHz of spectrum allocated to amateurs that is (1) VERY commercially desirable and (b) largely silent.

Use it or lose it!

FM simplex:
445.700, 445.725, 445.750, 445.775, 445.800, 445.825, 445.850, 445.875
445.900, 445.925, 445.950, 445.975, 446.000, 446.025, 446.050, 446.075
446.100, 446.125, 446.150, 446.175, 446.200, 446.225, 446.250, 446.275

Bold is unofficial National Calling Frequency

For comparison hams have just 4MHz of spectrum on 2m and have to cram repeater splits on 600KHz. This makes repeaters expensive and touchy to tune.
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  #25  
Old 02-02-2012, 08:38 PM
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(I'm a new ham, so I don't have a firm grasp on how this all works yet)

I was curious about the simplex on 70cm, because I noticed you showed 2m simplex in a sticky thread:

RS#1--146.460
RS#2--146.580
RS#3--147.420
RS#4--147.540

Just wanted to see if you use simplex on 70cm. If I read this correctly, it sounds like the 70cm is better to use in the mountains than the 2m??
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  #26  
Old 02-02-2012, 08:59 PM
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We have 4 channels designated for 2m since that's the most common radio, particularly in mobile rigs (2m), which is all most were getting when the club first got into ham radio. There currently isn't a designated Rising Sun 70cm frequency, and while there could easily be it wouldn't apply to likely 60% of our licensed operators here. not because of band privilege, but equipment.

And yes, you hit it the theme of the thread here is exploring just that- does 70cm propogate better in the mountains (and canyons) than 2m.. and my answer is I don't know, but I'm willing to try!
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  #27  
Old 02-02-2012, 09:41 PM
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Quote:
Originally Posted by nakman View Post
We have 4 channels designated for 2m since that's the most common radio, particularly in mobile rigs (2m), which is all most were getting when the club first got into ham radio. There currently isn't a designated Rising Sun 70cm frequency, and while there could easily be it wouldn't apply to likely 60% of our licensed operators here. not because of band privilege, but equipment.

And yes, you hit it the theme of the thread here is exploring just that- does 70cm propogate better in the mountains (and canyons) than 2m.. and my answer is I don't know, but I'm willing to try!
So Tim, let's try a 70cm channel tomorrow and see how it works. I will monitor 460 and the denver repeator for any RS members. If you are out and about we can try 70cm just LMK what channel. I will be on the south side of town so not sure of reception.
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  #28  
Old 02-02-2012, 10:19 PM
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Alright if I get called out I will definitely give you a shout!
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  #29  
Old 02-03-2012, 05:14 AM
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Quote:
Originally Posted by nakman View Post
does 70cm propogate better in the mountains (and canyons) than 2m
No, it does not and that's the point. It is more easily absorbed by terrain and does not multipath as badly as VHF, is less likely to duct in the troposphere, so less interference and less chance for random DX. The low side of UHF is more VHF-like than VHF.

Like I mentioned, I usually ragchew on the RMRL's 449.450/-5MHz/103.5 and I suggest using 446.000MHz simplex if you want to check paths since there might be people listening on that.
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