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[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]

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

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]

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.

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]

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!

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.

[Henry Cohen]

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.

Not relevant to the [expanded] STL band.

[brian maddox]

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.

I feel like that would make people unhappy. A LOT of people.  As an A1 i have learned that making a LOT of people unhappy is undesirable.  Makes sense that that would also carry over to RF tech. 

Great info.  Thanks again!

[Jason Glass]

I feel like that would make people unhappy. A LOT of people.  As an A1 i have learned that making a LOT of people unhappy is undesirable.  Makes sense that that would also carry over to RF tech. 

Great info.  Thanks again!

Don't assume that your event frequency coordinator knows these details, and for the love of God don't assume that someone else's license covers your X55 ops.

The person who transmits the signal is the operator and is ultimately responsible [you (or the company directly employing you)], and requires an appropriate call sign.

Ask your RF coordinator to copy you on all SBE emails and raise Hell if you don't personally see a specific approval before you transmit.

[brian maddox]

Don't assume that your event frequency coordinator knows these details, and for the love of God don't assume that someone else's license covers your X55 ops.

The person who transmits the signal is the operator and is ultimately responsible [you (or the company directly employing you)], and requires an appropriate call sign.

Ask your RF coordinator to copy you on all SBE emails and raise Hell if you don't personally see a specific approval before you transmit.

Trust, but verify.  Always a good policy.

[Scott Holtzman]

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.

Including if I recall quite a bit of medical telemetry gear operates in that region.  You could wipe out a nearby hospital wireless cardiac monitors.

[ProSoundWeb Community]