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Shure Axient Digital X55 Band [941MHz-960MHz]
brian maddox:
Okay, i've got my first gig coming up with Digital Axient in the X55 band. It's been a long time since i worked with anything this high up in the frequency band, and the stuff i did use was old Line6 stuff with very limited capability.
So, anything to watch out for or is this just Digital Axient "business as usual"?
tia
Luke Geis:
I try and do a whitespace estimate for my area before the show just to see, but generally, if you are in a legal band, the issues should be little to nonexistent. WWB also allows you to put in your zip code and it will block out the respective TV channels known ( at the time of the update ) to that area. If you ware running with full Axient ( auto switching ) I wouldn't worry too much. All I can say is that I LOVE the new Axient stuff. Nothing better than being able to change anything I need to on the fly, let alone the auto channel switching.
Jason Glass:
--- Quote from: brian maddox on November 25, 2019, 09:11:49 PM ---Okay, i've got my first gig coming up with Digital Axient in the X55 band. It's been a long time since i worked with anything this high up in the frequency band, and the stuff i did use was old Line6 stuff with very limited capability.
So, anything to watch out for or is this just Digital Axient "business as usual"?
tia
--- End quote ---
You MUST be Part 74 licensed to operate X55. No exceptions.
You MUST, absolutely MUST, do an FCC ULS geographic search for your operating location and frequency range (I suggest a 5 mile radius and examine each licensee's map for TX vs. RX stations. Avoid all RX within 5 mi and all freqs with P2P paths crossing within 1 mi of your location), and calculate your freqs to avoid each primary licensee's carriers, with appropriate channel freq spacings per emission designator.
Then you MUST, absolutely MUST contact the local SBE freq coordinator and request coordination approval for your freqs. I suggest 1 week in advance. Then, when you get on site, do a scan and add any newly found carriers to your coordination math, then do it all again and beg "Mia culpa" if you require an amended coord request.
brian maddox:
--- Quote from: Jason Glass on November 25, 2019, 10:09:33 PM ---You MUST be Part 74 licensed to operate X55. No exceptions.
You MUST, absolutely MUST, do an FCC ULS geographic search for your operating location and frequency range (I suggest a 5 mile radius and examine each licensee's map for TX vs. RX stations. Avoid all RX within 5 mi and all freqs with P2P paths crossing within 1 mi of your location), and calculate your freqs to avoid each primary licensee's carriers, with appropriate channel freq spacings per emission designator.
Then you MUST, absolutely MUST contact the local SBE freq coordinator and request coordination approval for your freqs. I suggest 1 week in advance. Then, when you get on site, do a scan and add any newly found carriers to your coordination math, then do it all again and beg "Mia culpa" if you require an amended coord request.
--- End quote ---
So, is there anything i MUST do? :)
Good news is, i'm not actually doing the Frequency Coordination on this gig and my confidence in those that are doing the coordination is quite high so i have every reason to believe that all of your musts are already being followed. My role on this is largely RF QC with a little Frequency Rules Enforcement thrown in [there will be press so there will likely be.... issues]. This is an annual gig with a very good crew of folks working on things, So i have every reason to believe things are gonna be well sorted before i even get there. I was mostly looking for any practical advice that might be different than the typical "TV band" stuff i'm used to using. Antenna placement differences, antenna cabling differences or any particular gotchas to look out for. I'm mixing these with a pile of UHFRs and PSM1000s, which wouldn't be my first choice. But i've got independent antenna rigs for each "family" of things [Axient, UHFR/analog, PSM] and i'm working outside, so that simplifies some things as well.
This is all still absolutely great info to have though, so thank you for that. I do have to ask, of these MUST recommendations, which would NOT usually apply to a typical 470-630 gig? I'm still trying to get a firm grip on things in our new FCC reality. Plus, knowledge is power.
Thanks for the help!
Jason Glass:
--- Quote from: brian maddox on November 25, 2019, 11:07:33 PM ---I do have to ask, of these MUST recommendations, which would NOT usually apply to a typical 470-630 gig? I'm still trying to get a firm grip on things in our new FCC reality. Plus, knowledge is power.
Thanks for the help!
--- End quote ---
The SBE coordination requirements aren't necessary for TV band operations.
If one were to inadvertently interfere with TV band operations in VHF or UHF, a 250 mW part 74 TX might cause problems for a few dozen viewers. If one interferes with 941-960 MHz ops, it can take an entire station off the air for 100k+ viewers/listeners or interrupt data connections for an entire region. Very, very serious stuff.
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