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Senhheiser AVX and DECT (1.9GHz) Intercoms
Ike Zimbel:
Anyone had any experience with how the Sennheiser AVX 1.9GHz wireless system coexists with 1.9GHz comms? Does it take up a time slot? If so, if you knew you had an AVX system in play, would that limit you to, say, 49 Bolero packs instead of 50 in one space?
Russell Ault:
--- Quote from: Ike Zimbel on July 03, 2022, 11:03:53 PM ---Anyone had any experience with how the Sennheiser AVX 1.9GHz wireless system coexists with 1.9GHz comms? Does it take up a time slot? If so, if you knew you had an AVX system in play, would that limit you to, say, 49 Bolero packs instead of 50 in one space?
--- End quote ---
I have zero experience, but given that Sennheiser recommends no more than 8 simultaneous AVX systems in North America I'd guess that each TX-RX pair uses half the time slots in a single DECT channel, or 10% of the total North American DECT spectrum (I'm ASSuming that the recommended maximum is 8 and not 10 in order to leave ~20% of the spectrum vacant to accommodate AVX's opportunistic frequency hopping).
Put another way, I'd expect one AVX system to use the spectrum of at least 5 Bolero packs, but with the automatic frequency hopping I wouldn't be totally surprised if you had to knock a whole Bolero antenna offline in order to keep one AVX system happy (although at that point you might be able to run two of them).
-Russ
Ike Zimbel:
--- Quote from: Russell Ault on July 03, 2022, 11:57:44 PM ---I have zero experience, but given that Sennheiser recommends no more than 8 simultaneous AVX systems in North America I'd guess that each TX-RX pair uses half the time slots in a single DECT channel, or 10% of the total North American DECT spectrum (I'm ASSuming that the recommended maximum is 8 and not 10 in order to leave ~20% of the spectrum vacant to accommodate AVX's opportunistic frequency hopping).
Put another way, I'd expect one AVX system to use the spectrum of at least 5 Bolero packs, but with the automatic frequency hopping I wouldn't be totally surprised if you had to knock a whole Bolero antenna offline in order to keep one AVX system happy (although at that point you might be able to run two of them).
-Russ
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Well, I have up to nine AVX systems in the building, and 33 Bolero packs and, so far, everyone plays nicely...
Russell Ault:
--- Quote from: Ike Zimbel on July 07, 2022, 11:05:04 PM ---Well, I have up to nine AVX systems in the building, and 33 Bolero packs and, so far, everyone plays nicely...
--- End quote ---
Huh. 9 AVX on its own is more than Sennheiser recommends (let alone everything else that's going on), so that's a surprise. Of course, I just ASSumed that you were in North American; are you over in Europe right now?
-Russ
Ike Zimbel:
--- Quote from: Russell Ault on July 16, 2022, 03:50:48 PM ---Huh. 9 AVX on its own is more than Sennheiser recommends (let alone everything else that's going on), so that's a surprise. Of course, I just ASSumed that you were in North American; are you over in Europe right now?
-Russ
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No, this was at the Bell Center in Montreal. I'm not 100% sure how many were in use at any one time, and I know for a fact that at least a couple that were requested didn't actually show up because that crew's equipment was jacked out of a car before they flew to Montreal. This was, on the one hand, the craziest media check-in I have ever done, with 50+ crews in the building. On the other hand, I had received advance requests from about 85% of them and had returned them with coordinated frequencies. Of those, I'd say a solid 60% of the individual EFP crews, and 100% of the 10 EFP crews hired by the client showed up with their equipment already tuned and on frequency.
As for the AVX systems, in walking around the building, I saw several of them in use in various interview spaces along or adjacent to the perimeter ring. So I doubt that many of them were out on the floor were the bulk of the Bolero was deployed. I was remotely monitoring the DECT band from my cramped little corner near the entrance and I never noticed it getting particularly busy. So the answer to my question is either "it depends" or, "wear Depends (TM)", depending on how nervous you may be about this issue. ???
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