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-   -   What are the most common 70m simplex frequencies that are used? (http://forums.radioreference.com/amateur-radio-general-discussion/264430-what-most-common-70m-simplex-frequencies-used.html)

Danny37 04-07-2013 11:39 PM

What are the most common 70m simplex frequencies that are used?
 
I want to punch in some frequencies for a ham bank I'm putting in my scanner. I understand that 446.000 is the national calling but are there any more that are commonly used for simplex communication? Particularly in the 70m band.

gewecke 04-07-2013 11:47 PM

Quote:

Originally Posted by Danny37 (Post 1948444)
I want to punch in some frequencies for a ham bank I'm putting in my scanner. I understand that 446.000 is the national calling but are there any more that are commonly used for simplex communication? Particularly in the 70m band.

In certain regions, 447.000 is used.

73,
n9zas

Danny37 04-07-2013 11:48 PM

Quote:

Originally Posted by gewecke (Post 1948449)
In certain regions, 447.000 is used.

73,
n9zas

Wait 447 is used as a national calling in some regions?

trsundstrom 04-07-2013 11:52 PM

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446.500 is a known simplex frequency, but in all my travels over the years I've never heard anyone on it.

gewecke 04-08-2013 12:02 AM

Have not heard traffic on 446.5 but have heard balloon-hams on 447.000 but could not get a reply from them, due to a unknown tone.
No specifics as to altitude or direction but I tried several times. :(

73,
n9zas

gewecke 04-08-2013 12:04 AM

Quote:

Originally Posted by Danny37 (Post 1948450)
Wait 447 is used as a national calling in some regions?

Not so much a calling freq, but more informal chit-chat from what I've heard.

73,
n9zas

zz0468 04-08-2013 1:54 AM

Quote:

Originally Posted by Danny37 (Post 1948444)
I want to punch in some frequencies for a ham bank I'm putting in my scanner. I understand that 446.000 is the national calling but are there any more that are commonly used for simplex communication? Particularly in the 70m band.

446.000 is the only nationally recognized simplex FM frequencies on the 440 band. As stated before, 446.500 is commonly used as well. If you had SSB cabability, 432.100 is the SSB calling frequency. The rest of the band is repeater inputs and outputs, amateur television, and point to point links. There isn't much demand for UHF simplex frequencies, so none of the local coordinating organizations have allocated more than a small handful, and that would vary by area.

n9mxq 04-08-2013 1:59 AM

446.000 is ARRL's simplex calling frequency, if that makes it "nationally recognized", OK. But simplex can be found anywhere not occupied by a repeater or other full time service.

Each area has their own layout of how things work. Contacting a ham in your local area would be your best bet.

zz0468 04-08-2013 2:00 AM

Quote:

Originally Posted by Danny37 (Post 1948450)
Wait 447 is used as a national calling in some regions?

Not that I've every heard of. In the western U.S., it's either a repeater input, or output in most locations. Since it's on the band edge of the ARRL national bandplan, it could be considered "unpaired".

Frequency use in many of the VHF/UHF ham bands is planned and coordinated locally, so what one person tells you here may or may not be even remotely true where you're listening from. Tell us what area you're interested in, and you can get more accurate information.

zz0468 04-08-2013 2:03 AM

Quote:

Originally Posted by n9mxq (Post 1948490)
446.000 is ARRL's simplex calling frequency, if that makes it "nationally recognized", OK.

What makes it "nationally recognized" is that virtually every local bandplan in the country shows it as a simplex channel.

Quote:

Originally Posted by n9mxq (Post 1948490)
But simplex can be found anywhere not occupied by a repeater or other full time service.

On a hit and miss basis, yet. And much of this scattered simplex traffic ends up interfering with either links or repeater inputs, and the people using simplex have no clue just how far and wide they're being heard.

Quote:

Originally Posted by n9mxq (Post 1948490)
Each area has their own layout of how things work. Contacting a ham in your local area would be your best bet.

I enthusiastically agree.

Danny37 04-08-2013 3:54 AM

I'm in the NYC area so, in the TRISTATE area if anyone knows of most common simplex frequencies used for northern NJ, NYC and the surrounding counties and southern CT. I would really appreciate it.

KB7MIB 04-08-2013 4:00 AM

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I believe, but could be mistaken, that 446.100 is a secondary simplex channel in Arizona. 441.000 is also a good possibility. Google your state/regional frequency coordination body and look up their bandplan for 70cm.

KB7MIB 04-08-2013 4:05 AM

Wirelessly posted (Mozilla/5.0 (X11; Linux i686; U; en-US) Gecko/20081217 Vision-Browser/8.1 301x200 LG VN530)

www.metrocor.net and/or www.qsl.net/metrocor for NYC/LI and NNJ
www.ctspectrum.com for CT
These are per the 2010-2011 ARRL Repeater Directory.

Spankymedic7 04-08-2013 11:22 AM

70cm Simplex Frequencies
 
Hello,

Here are some of the common 70cm simplex frequencies that I have in all of my radios...

445.975
446.000
446.025
446.050
446.075

Like others have mentioned, I'm sure that simplex frequencies vary by region, but these do fall within the 70cm band plan as "simplex" frequencies.

I hope this helps.

zz0468 04-08-2013 11:48 AM

Quote:

Originally Posted by Spankymedic7 (Post 1948653)
Here are some of the common 70cm simplex frequencies that I have in all of my radios...

445.975
446.000
446.025
446.050
446.075

Like others have mentioned, I'm sure that simplex frequencies vary by region, but these do fall within the 70cm band plan as "simplex" frequencies

I'm curious what band plan shows those as simplex frequencies. In the southwest US, those are all repeater inputs or outputs, with 446.000 being the one exception.

My concern is that dissemination of really local info in a nationwide forum might mislead people into thinking it's wide open for simplex use everywhere. It's already bad enough with new hams not being aware of local band planning.

To add to the confusion, Southern California is on 20 KHz channel spacing, not 25 KHz. This serves to illustrate just how local UHF bandplans actually are.

jhooten 04-08-2013 12:31 PM

ARRL Band plan:
442.00-445.00 Repeater inputs and outputs (local Option)
445.00-447.00 Shared by Auxiliary and control links, repeaters and Simplex (local option)
446.00 National Simplex
447.00-450.00 repeater inputs and outputs (local option)

According to the ARRL band plan they are valid simplex freqs.

nd5y 04-08-2013 12:52 PM

Texas has a different band plan for the 440-450 part of 70cm.
Texas VHF-FM Society

fineshot1 04-08-2013 3:59 PM

Folks - bottom line is that band plans are determined by a regional coordination council.
See list below on the NFCC website for what state you are in. The ARRL band plans are simply
suggested and the regional councils determine this.

NFCC.US - NFCC Coordinators

gewecke 04-08-2013 8:22 PM

Quote:

Originally Posted by zz0468 (Post 1948670)
I'm curious what band plan shows those as simplex frequencies. In the southwest US, those are all repeater inputs or outputs, with 446.000 being the one exception.

My concern is that dissemination of really local info in a nationwide forum might mislead people into thinking it's wide open for simplex use everywhere. It's already bad enough with new hams not being aware of local band planning.

To add to the confusion, Southern California is on 20 KHz channel spacing, not 25 KHz. This serves to illustrate just how local UHF bandplans actually are.

On the contrary, I just put those simplex suggestions in my radios since I prefer the quieter simplex frequencies over the "beep-boop" repeaters any day.
I'm by no means new, but I have become calloused to the 21st century repeaters since they seem to have every feature imaginable activated. :(

73,
n9zas

aspicer 04-05-2014 12:05 PM

Quote:

Originally Posted by gewecke (Post 1948462)
Have not heard traffic on 446.5 but have heard balloon-hams on 447.000 but could not get a reply from them, due to a unknown tone.
No specifics as to altitude or direction but I tried several times. :(

73,
n9zas

They probably weren't talking if they were experimenting with balloons. It was probably telemetry data. I doubt the hams were on balloons flying around talking simplex on 440.

It's like the balloon payments for your house ... they keep going UP!


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