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Author Topic: How do I go about choosing a frequency band as in P1 or P2 ?  (Read 781 times)

Mal Brown

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Looking at Galaxy Audio as-1100T IEM transmitter and their DHXR wireless mic receiver.  Installing a jumper on the DHXR unit allows it to receive from the transmitter and you get wireless audio distribution.

In my area 97031 I have approx 5 TV broadcasters 50 to 55 miles to the west.  They are over on the west side of the Cascade mountains, I am on the east side of the range.

The broadcasters are using 536, 554, 578, 584 and 566.  I do not believe any have local repeaters or if that is even a thing for TV in the UHF range.

Galaxy seems to have commonly available units that support
518 to 547
584 to 607


So... which range do I pick ?  or do I keep on looking ?

Thank you for helping this miscreant ;-)
« Last Edit: July 24, 2021, 12:35:32 PM by Mal Brown »
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Luke Geis

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Re: How do I go about choosing a frequency band as in P1 or P2 ?
« Reply #1 on: July 23, 2021, 09:13:17 PM »

Generally, it is best to look up your local area's frequency allocation or whitespace as it is often called. You want to choose a frequency band that is in the least congested area you can. If you have three local TV stations that eat up a large swath of 600-650mghz ( for example ), and there is little or no use in the 500-550mghz range, then you would want to go for the 500-550 range.

Another way is to call a few large production rental companies in your area and ask them what bands they use. It is often best to go with something similar to them. If they are renting out RF a lot, they will have sussed out the best band to use in the area.
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Mal Brown

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Re: How do I go about choosing a frequency band as in P1 or P2 ?
« Reply #2 on: July 24, 2021, 12:46:11 PM »

What is a good google search phrase ? 
When I google 97031 UHF frequency availability I get a link to a vendor named notable.  They list off the TV staion frequencies in use I noted above... 

https://nocable.org/availability-report/zip/97031-hood-river-or/

Is there something more comprehensive ?

I'm out here in the boondocks.  The big dogs down in Portland aren't coming out here for the small potato gigs that are happening here.
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Jason Glass

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Re: How do I go about choosing a frequency band as in P1 or P2 ?
« Reply #3 on: July 24, 2021, 03:17:10 PM »

What is a good google search phrase ? 
When I google 97031 UHF frequency availability I get a link to a vendor named notable.  They list off the TV staion frequencies in use I noted above... 

https://nocable.org/availability-report/zip/97031-hood-river-or/

Is there something more comprehensive ?

I'm out here in the boondocks.  The big dogs down in Portland aren't coming out here for the small potato gigs that are happening here.

Find your venue's precise decimal coordinates here.  https://getlatlong.net/

Go to https://www.rabbitears.info/searchmap.php.  Enter your venue's decimal coordinates.  Select NO for "Shift Shown Location for Privacy".

On the results page that comes up, select RF Channel next to "Sort By".  Select Yes next to "Hide Off-Air"  Don't operate wireless on any TV RF channel (shown in parenthesis) indicated as "Poor", "Fair", or "Good".

For your reference:

TV   Channel Band (MHz)
14   470-476
15   476-482
16   482-488
17   488-494
18   494-500
19   500-506
20   506-512
21   512-518
22   518-524
23   524-530
24   530-536
25   536-542
26   542-548
27   548-554
28   554-560
29   560-566
30   566-572
31   572-578
32   578-584
33   584-590
34   590-596
35   596-602
36   602-608
« Last Edit: July 24, 2021, 03:27:31 PM by Jason Glass »
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Mal Brown

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Re: How do I go about choosing a frequency band as in P1 or P2 ?
« Reply #4 on: July 24, 2021, 04:34:06 PM »

Am I good if every entry in the list is marked 'Bad' ?  There are 24 discreet channels listed between 7 and 36.  All marked bad, some with a few different stations listed on the same channel multiples on ch 24 for instance.

This was interesting, thanks!
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Luke Geis

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Re: How do I go about choosing a frequency band as in P1 or P2 ?
« Reply #5 on: July 25, 2021, 09:10:30 PM »

Most whitespace is eaten up by TV and Cell use now. As mentioned, it is often best to call and see what band a larger rental house would provide and go with that. A company like Nationwide provides the best available option of the locale they are delivering the product to unless you request otherwise. 
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Mal Brown

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Re: How do I go about choosing a frequency band as in P1 or P2 ?
« Reply #6 on: July 26, 2021, 12:28:58 PM »

I can try that but I'm not even in a secondary market.  More like 3rd or 4th...
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Russell Ault

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Re: How do I go about choosing a frequency band as in P1 or P2 ?
« Reply #7 on: July 26, 2021, 02:48:10 PM »

Am I good if every entry in the list is marked 'Bad' ?  There are 24 discreet channels listed between 7 and 36.  All marked bad, some with a few different stations listed on the same channel multiples on ch 24 for instance.
{...}

Are you planning to use this equipment anywhere other than your current ZIP code? If yes, make sure to check those ZIP codes too. If no, (i.e. if all the locations you're planning to use this gear in have literally zero over-the-air TV stations with a "poor" or better signal) then I'd say "yup, you're good", and it doesn't really matter which band you pick as far as available spectrum goes.

Of course, the follow-up question is: do you have any other wireless equipment that you'd like this new stuff to play nice with?

-Russ
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Mal Brown

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Re: How do I go about choosing a frequency band as in P1 or P2 ?
« Reply #8 on: July 28, 2021, 02:11:44 PM »

I'm not planning on working outside my little zone in the boonies anything soon...  and unfortunately, all old wireless stuff was obsoleted by Ajit Pai and T-Mobile...
« Last Edit: July 28, 2021, 04:28:40 PM by Mal Brown »
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Fb Gorge Sound and Light
WillyandNelson.com

Russell Ault

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Re: How do I go about choosing a frequency band as in P1 or P2 ?
« Reply #9 on: July 28, 2021, 03:53:10 PM »

I'm not planning on working outside my little zone in the boonies anything soon...  and unfortunately, all old wireless stuff was obsoleted buy Ajit Pai and T-Mobile...

Then it sounds like you can really can't go wrong!

-Russ
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Re: How do I go about choosing a frequency band as in P1 or P2 ?
« Reply #9 on: July 28, 2021, 03:53:10 PM »


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