List of recommended simplex freqs to use w/openspot?

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jimmyg
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List of recommended simplex freqs to use w/openspot?

Post by jimmyg » Sat Apr 07, 2018 12:42 am

I'm sure this has been asked before, but I am unable to find it in forums; if so please attach/reroute to said topic.

I've been using openspot/shark for couple weeks now in Texas, and New Mexico, and trying to find a list of freqs recommended for simplex use.

I did hear someone recently (FM on Analog), last couple days on freq I'm using currently (435.000MHz).

Please advise if there's a database nationwide/local. I live/reside in NM/TX.

Thnaks

Jimmyg

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VK7HSE
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Re: List of recommended simplex freqs to use w/openspot?

Post by VK7HSE » Sat Apr 07, 2018 2:58 am

The same issue for VK (Australia) there's no designated section specifically set aside for hotspots. So for me I just make sure I'm well clear of the analogue voice repeater input/outputs and clear of weak signal and space communication sections of the band plan. Going forward the relevant governing bodies for each zone/countries will need to set aside dedicated set frequency(ies) as to minimise any potential interference from the different modes etc...

The default frequency the openspot is set to (436.0MHz) is within the satellite space segment and should be avoided! however there are many who either just don't know what their countries band plan is (if there is one at all) so this isn't an easy task to fix!

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K7CTC
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Re: List of recommended simplex freqs to use w/openspot?

Post by K7CTC » Mon Apr 09, 2018 1:35 am

I would look to the frequency coordinator for your area to see if there is a published local band plan... It's always best practice to try to stick to the band plan whenever possible. On the other hand the openSPOT is probably not going to interfere with satellite comms at only 20mw. As you're probably already aware, its best to also run whatever rig you use with the openSPOT in the lowest power setting possible. I like that my Yaesu drops down to something like 250mw in the lowest power setting. I wish my other radio did that but it only goes down to 1w. You could also replace your antenna with one of those really small stubby antennas which would further reduce your effective range.

In Utah, we have the Utah VHF Society that coordinates all the repeater frequencies and publishes a band plan on their site. There are a lot of areas that do something similar and some areas where there is a complete vacuum of information (aside from the national ARRL band plan). So I suppose it really depends on where you live.

IMHO, this whole digital hotspot business has gained momentum so fast that the organizations that would otherwise publish recommended frequencies have not had a chance to catch up to the times.

73,
Chris (K7CTC)

jimmyg
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Re: List of recommended simplex freqs to use w/openspot?

Post by jimmyg » Sat Apr 21, 2018 10:30 pm

Thanks for the reply folks. I've changed the freq, so am not on sat freq 436.000. I also ordered this antenna to use: https://www.amazon.com/gp/product/B0759 ... UTF8&psc=1

I run low power 500mW on yaesu FT-70D, and so we'll see how this stubby works once it arrives.

N1GMV
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Re: List of recommended simplex freqs to use w/openspot?

Post by N1GMV » Tue Jun 26, 2018 5:46 pm

People are putting amplifiers and external antennas on them, do you realize how little power the Cube satellites are using?

KE8DPF
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Re: List of recommended simplex freqs to use w/openspot?

Post by KE8DPF » Wed Jun 27, 2018 2:10 am

Getting back to the original question as to which frequencies might be best to use FOR A U.S.-BASED HAM WITH AN OPENSPOT OPERATING IN THE U.S., the ARRL Amateur Radio Band Plan suggests the following possibilities on the 70cm UHF band. Again, these are frequencies in the U.S. Band Plan. Other countries most likely allocate different ranges or specific frequencies, for such use.

IN THE U.S.:

Part of the 70cm band (433.00 - 435.00 MHz) is reserved for "Auxiliary Repeater Links" (your OpenSPOT fits this definition well enough.) If you start at 433.0125, and go to 434.9875 Mhz, with 12.5 KHz spacing, you end up with the following list of possible frequencies. IT IS UP TO YOU TO MAKE SURE A FREQUENCY IS NOT ALREADY IN USE BEFORE YOU BEGIN USING IT WITH YOUR OPENSPOT !!! If you cause interference with someone else's equipment, there is no excuse for not trying a different frequency! You might want to check with your area's Frequency Coordinator.

Auxiliary Repeater Links 433-435 (12.5 kHz Steps)
433.0125 433.2625 433.5125 433.7625 434.0125 434.2625 434.5125 434.7625
433.0250 433.2750 433.5250 433.7750 434.0250 434.2750 434.5250 434.7750
433.0375 433.2875 433.5375 433.7875 434.0375 434.2875 434.5375 434.7875
433.0500 433.3000 433.5500 433.8000 434.0500 434.3000 434.5500 434.8000
433.0625 433.3125 433.5625 433.8125 434.0625 434.3125 434.5625 434.8125
433.0750 433.3250 433.5750 433.8250 434.0750 434.3250 434.5750 434.8250
433.0875 433.3375 433.5875 433.8375 434.0875 434.3375 434.5875 434.8375
433.1000 433.3500 433.6000 433.8500 434.1000 434.3500 434.6000 434.8500
433.1125 433.3625 433.6125 433.8625 434.1125 434.3625 434.6125 434.8625
433.1250 433.3750 433.6250 433.8750 434.1250 434.3750 434.6250 434.8750
433.1375 433.3875 433.6375 433.8875 434.1375 434.3875 434.6375 434.8875
433.1500 433.4000 433.6500 433.9000 434.1500 434.4000 434.6500 434.9000
433.1625 433.4125 433.6625 433.9125 434.1625 434.4125 434.6625 434.9125
433.1750 433.4250 433.6750 433.9250 434.1750 434.4250 434.6750 434.9250
433.1875 433.4375 433.6875 433.9375 434.1875 434.4375 434.6875 434.9375
433.2000 433.4500 433.7000 433.9500 434.2000 434.4500 434.7000 434.9500
433.2125 433.4625 433.7125 433.9625 434.2125 434.4625 434.7125 434.9625
433.2250 433.4750 433.7250 433.9750 434.2250 434.4750 434.7250 434.9750
433.2375 433.4875 433.7375 433.9875 434.2375 434.4875 434.7375 434.9875
433.2500 433.5000 433.7500 434.0000 434.2500 434.5000 434.7500

A second block within the 70cm band (445.00 - 447.00 MHz) is reserved for "Auxiliary and Control Links, Repeaters, and Simplex (Local Option)". Again, your OpenSPOT is a good fit, here. If you start at 445.0125, and go to 446.9875 Mhz, with 12.5 KHz spacing, you end up with the following list of possible frequencies. AGAIN - IT IS UP TO YOU TO MAKE SURE A FREQUENCY IS NOT ALREADY IN USE BEFORE YOU BEGIN USING IT WITH YOUR OPENSPOT !!! It bears repeating - you might want to check with your area's Frequency Coordinator.

Auxiliary and Control Links, Repeaters, and Simplex (Local Option) 445-447 (12.5 kHz Steps)
445.0125 445.2625 445.5125 445.7625 446.0125 446.2625 446.5125 446.7625
445.0250 445.2750 445.5250 445.7750 446.0250 446.2750 446.5250 446.7750
445.0375 445.2875 445.5375 445.7875 446.0375 446.2875 446.5375 446.7875
445.0500 445.3000 445.5500 445.8000 446.0500 446.3000 446.5500 446.8000
445.0625 445.3125 445.5625 445.8125 446.0625 446.3125 446.5625 446.8125
445.0750 445.3250 445.5750 445.8250 446.0750 446.3250 446.5750 446.8250
445.0875 445.3375 445.5875 445.8375 446.0875 446.3375 446.5875 446.8375
445.1000 445.3500 445.6000 445.8500 446.1000 446.3500 446.6000 446.8500
445.1125 445.3625 445.6125 445.8625 446.1125 446.3625 446.6125 446.8625
445.1250 445.3750 445.6250 445.8750 446.1250 446.3750 446.6250 446.8750
445.1375 445.3875 445.6375 445.8875 446.1375 446.3875 446.6375 446.8875
445.1500 445.4000 445.6500 445.9000 446.1500 446.4000 446.6500 446.9000
445.1625 445.4125 445.6625 445.9125 446.1625 446.4125 446.6625 446.9125
445.1750 445.4250 445.6750 445.9250 446.1750 446.4250 446.6750 446.9250
445.1875 445.4375 445.6875 445.9375 446.1875 446.4375 446.6875 446.9375
445.2000 445.4500 445.7000 445.9500 446.2000 446.4500 446.7000 446.9500
445.2125 445.4625 445.7125 445.9625 446.2125 446.4625 446.7125 446.9625
445.2250 445.4750 445.7250 445.9750 446.2250 446.4750 446.7250 446.9750
445.2375 445.4875 445.7375 445.9875 446.2375 446.4875 446.7375 446.9875
445.2500 445.5000 445.7500 446.0000 446.2500 446.5000 446.7500

It is recommended that you check with your local Frequency Coordinator before selecting a frequency, and at the very least, set a UHF ANALOG radio to a frequency of interest, in VFO simplex mode. Then turn up the volume, and just listen for a couple hours as you go about your day. If you don't hear anything (voice, digital screeching, or other obvious traffic), you might be able to use that frequency. If you hear anything, set VFO to a different frequency and listen again for a couple hours. (With so many frequencies to choose from, if you pick something in the middle of the pack, you'll likely get lucky on the first try.)

Again, the frequencies I've listed here are appropriate per the U.S. Band Plan, for U.S. hams operating only in the U.S. Users elsewhere need to research what may be (or is not) allowed in your country.

Hope this info helps!

Mudflap
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Re: List of recommended simplex freqs to use w/openspot?

Post by Mudflap » Sun Oct 28, 2018 11:15 pm

Good info. Thanks for posting.

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zelthian
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Re: List of recommended simplex freqs to use w/openspot?

Post by zelthian » Mon Oct 29, 2018 3:10 pm

Frequency coordination is done state by state in the US. I live in Colorado, and our state's section has a frequency coordination committee that publishes a "band plan".

Texas has a similar band plan:

http://www.txvhffm.org/coordination/bandplan.php

I'd suggest picking a frequency in the ranges listed as Simplex NB (narrowband) Digital.

New Mexico has no such band plan, but they do publish a list of repeaters and general area of the state where they reside. Here is the 70cm list:

https://www.qsl.net/nmfcc/NMFCCrepeater440MHz.shtml

If you can find an appropriate frequency from the Texas list that isn't in use by a repeater in the NM list in the area of NM where you reside, you'd be golden and not have to change frequencies as you move around. :)

digitalvoice
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Re: List of recommended simplex freqs to use w/openspot?

Post by digitalvoice » Thu Nov 08, 2018 6:58 pm

It amazes me how many Hams who have taken the FCC license exam and still dont know what frequencies they need to keep their equipment on. Then the ones that can't even solder. Amazing.

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