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Author Topic: 2 Meter Simplex Frequencies  (Read 18493 times)
K8RBT
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Posts: 29




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« on: January 04, 2002, 03:22:10 PM »

I've been digging through several ARRL books and can't seem to come up with answer to this question. What are "acceptable" frequencies for 2 meter FM simplex? I understand the band plans for simplex, repeaters, etc. but I also think that one is suppose to use a standard frequency spacing.
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W7OT
Member

Posts: 2




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« Reply #1 on: January 04, 2002, 04:21:07 PM »

The ARRL Repeater directory has all of the information that you are looking for.  It lists suggested simplex channels, the national calling channel, and even has a map of the US showing the channel spacing (15 kHz vs 20 kHz) that is used in each state.
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INITZERO
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Posts: 102


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« Reply #2 on: January 04, 2002, 04:24:08 PM »

> What are "acceptable" frequencies for 2 meter
> FM simplex?

I am probably over-simplifying (and not being much
help) by saying just about anything that isn't
otherwise in use can be used simplex.

> one is suppose to use a standard frequency spacing.

It seems that 15hz is fairly widely used. I don't
ever remember reading a standard spacing. I've seen
this list of 2M simplex frequencies in a number of
places on the web...

146.400    146.415    146.430    146.445
146.460    146.475    146.490    146.505
146.535    146.550    146.565    146.580
146.595    147.405    147.420    147.435
147.450    147.465    147.480    147.495
147.510    147.525    147.540    147.555
147.570    147.585

  (
http://larc.unl.edu/vhf.freq.html
http://www.ac6v.com/callfreq.htm
http://www.qsl.net/kd4sai/2meter.html
  )

    In addition to those, you've also got the
national 2M calling frequency, 146.52.

    Matt (k4mls)
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K8RBT
Member

Posts: 29




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« Reply #3 on: January 04, 2002, 04:37:46 PM »

Wow, thanks for the quick response on this. Exactly what I was looking for. By the way, I meant to look in the ARRL Repeater book but then forgot before posting.

I've been using 147.400 with my son. Probably should bump this up to one 147.405 instead.
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WF0H
Member

Posts: 57




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« Reply #4 on: January 04, 2002, 05:29:50 PM »

In general, there are frequencies you should avoid with FM simplex. Obviously, you can't use it below 144.1. All of the repeater input frequency bands need to be avoided. The satellite band from 145.8 to 146.0 needs to be completely avoided due to the possibility that your FM signal could interfere with satellite communications. Also, avoid the APRS frequency at 144.39 and any other established local or national frequencies.
Unless you live in a very busy place, you probably won't get in much trouble using any of the frequencies between 145.530 and 145.770. I have never heard anyone actually using the 15 Khz. splits between 146.49, 146.52, 146.55, 146.58, but that should not be a problem in most places. Those are by far the most active simplex frequencies here.
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WB6BYU
Member

Posts: 13029




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« Reply #5 on: January 07, 2002, 03:38:52 PM »

This will depend a lot on the local band plan.  Here in the Pacific
Northwest, the standard is 20 kHz spacing, so 147.400 would be
an acceptable channel.  The band from 145.5 to 145.8 is often
filled with packet stations, so it can take some monitoring to find
a frequency which isn't being used by a link somewhere.

Generally, you can operate anywhere in the bands from 146.4 -
146.6 and 147.4 - 1467.6 as long as you aren't within 15 kHz of
an established frequency or another QSO.  In a conjested area this
may mean that you have to stay on the recommended channels
in your area.
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N3WHV
Member

Posts: 1


WWW

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« Reply #6 on: January 17, 2002, 03:48:11 AM »

Hello,

If you look carefully, a lot of spectrum management agencies in states are making several adjustments, so please be careful when you go to simplex!

In Western Pennsylvania (and perhaps your area) we use the following band plan:

-- FM Operations --

APRS
144.390 and 145.790 MHz

Packet
144.910 to 145.090 MHz (20 kHz step)
145.690 to 145.770 MHz (20 kHz step)

Experimental (Simplex)
145.510 to 145.670 MHz (20 kHz step)

Simplex
146.520 to 146.595 MHz (15 kHz step)
147.520 to 147.585 MHz (15 kHz step)

Repeater Outputs [-0.600 kHz offset]
145.110 to 145.490 MHz (20 kHz step) [1]
146.610 to 147.000 MHz (15 kHz step) [2]

Repeater Outputs [+0.600 kHz offset]
147.000 to 147.390 MHz (15 kHz step) [3]

Repeater Outputs [+1.000 MHz offset]
146.415 to 146.505 MHz (15 kHz step) [4]

Repeater Inputs
144.550 to 144.890 MHz (20 kHz step) [1]
146.010 to 146.400 MHz (15 kHz step) [2]
147.600 to 147.990 MHz (15 kHz step) [3]
147.415 to 147.505 MHz (15 kHz step) [4]

Regards,

John D. Lewis
jdlewis@jdlewis.org
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