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How do I go about choosing a frequency band as in P1 or P2 ?
Mal Brown:
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 ;-)
Luke Geis:
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.
Mal Brown:
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.
Jason Glass:
--- Quote from: Mal Brown 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.
--- End quote ---
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
Mal Brown:
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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