Messages

1

Tools of the Trade / Newish comm system - Green Go Comm

« on: Aug 13, 2012, 01:46 pm »

Looks promising, Green Go  http://www.greengocom.com/contactus.html
Has anyone used it? Got answers to the following?

This looks very interesting. Too bad the website is lacking any real information. The quick setup paper is about it.
I haven't used it, yet. What I wonder is:
1. What they consider low latency?
2. What is the effect of poor QoS Ethernet, esp if some of the system is connected by WiFi
3. Is there a way to program it off line? No info on site but there seems to be some talk of a laptop.
4. Can beltpacks be cloned? I will really need to know this for a 3000+ beltpack system.
5. Can the setup be saved?
6. What is the audio BW?
7. PoE has limited current supply. Maybe they should recommend some switches or hubs which can support 30+ beltpacks on a string.
8. Can you Y the signal without a hub, like Helixnet?
9. Each BP has a loop thru switch - too bad it isn't 3 port.
10. Do I need to program at each BP or master station or can I do it over the net. This id really the crux.
Master station with only 32 switches is not adequate for the Olympics but fine for most shows.

2

Tools of the Trade / Re: Wireless Headset Technology

« on: Aug 12, 2012, 02:35 pm »

if I was running a large matrix system and needed a number of people roaming around a large area - say a festival site or a race track OB - cellcom is the solution (seamless handoff between antennas, highly configurable etc) -

On the subject of coms though - Riedel is an oft-overlooked company - their wireless coms system is up there with Cellcom/Freespeak and their digital beltpacks are very nice (AES - no more interference). I have yet to experience Clearcom HelixNet -

Tempest also seamlessly moves between zones on the roaming configuration.  You can easily configure the exact handoff QoS point since the Beltpacks display Both the QoS of the BP and the base as you walk around.  Handoff happens when your Qos falls to a certain level AND you are in another zone programmed for that Beltpack which is better.  Really nice.

I have had issues with CellCom in the us when users have Sprint cell phones which share the band.

Riedel Acrobat runs on a band shared by in house wireless phones and if the facility has this system the Acrobat cannot be used.

The Riedel C3 AES beltpacks are great, I agree.  Here on the London 2012 opening we have 71 in use and not a bit of hum or crosstalk.

The CC Helix net has the advantage of 4 channels on a single mic cable but the limitation of 10 beltpacks per power supply output.

3

Tools of the Trade / Re: Wireless Headset Technology

« on: Aug 12, 2012, 03:08 am »

Clearcom also make the Tempest range... never used them, but they opperate on 2.4GHz, which is a crowded area of the spectrum

While the Tempest is in the 2.4 gHz region shared by lots of uncoordinated WiFi access points, it is NOT affected by them and has less than a 10% affect on the data delivery in WiFi.  It operates as SSFH or Spread Spectrum Frequency Hopping.  If you looked at the signal you would see the WiFi bumps and SSFH spikes popping up much higher than the WiFi.  Each of these spikes had Tempest data for a very short period of time at a much higher peak level which overrides any WiFi.

They also have a 900mHz station but only 1 base station can operate in it at a time.  The 2.4gHz system can have a maximum of 11 base stations.  Each can have 5 full duplex stations or in shared mode any number of beltpacks.  In shared mode you do hear the latency echo, though.

The power comes when you use the system in roaming mode.  you could have 20 beltpacks on 4 base stations in the theatre with the ability to have 2 bases covering the loading dock (so 5 of the 20 max could roam there) and 1 base in the Dressing room (so 5 could roam there)  Each BP can be assigned to be able to access specific base stations.

All Bases can be co-located and antennas on cat-5 distributed to each area.

I believe it is the most powerful, most versatile system out there.  Even though it is also a Clear-Com product along with CellCom, it is the better solution.

Tempest is made by Coachcom but the exclusive distributor for theatre and TV is Clear-Com.

here is an article on the roaming:  http://tempestwireless.com/products/roaming.php

If you have any questions, please ask.