2024 Indycar

[speedway_navigator]

That was probably NBC production. Indycar Radio internal/production was on 450.6375 and was pretty entertaining at the Mile.

The TV production folks usually use 450-451 and the 5 MHz offset per part 74 of FCC rules.

Federal Register :: Request Access

These can be continuous duty and don't require sharing like part 90 rules.

These change per track and are chosen by the local SBE coordinator.
You might have been hearing an intermodulation mix.

 

[evilbrad]

That freq and ran I have found in the clear open mic steady carrier convos at indy races. Sounded team related or could have been a manufacturer such as firestone.There was another open carrier uhf freq and ran not enc I found as well. And my luck it was written down.

 

[evilbrad]

Honestly I've never seen a dmr capable radio on a TV/Media person at a indy or nascar event. They all appear to be old analog moto gear.

 

[speedway_navigator]

It's been year since I worked on a TV crew doing audio, Broadcast sports international does RF for lots of events like X games Indy car. I think they are a Hytera dealer, maybe DMR audio does not work well for that purpose. When I did PGA shows for ESPN they were using Icom U16s for the announcer pack and GP300s for spotters.

The Icoms had problems with the batteries coming loose so I suggested we use the 300s. For some reason they thought the 300s would not work, I think they had the 300s in 12.5 kHz mode but the repeaters were still wide band. We made the change and had a much lower failure rate.
The Icoms were longer, when the announcer sat in the golf cart the battery would drag on the seat and bend the battery away from the radio.
The 300s are shorter and did not have the same problem since the battery was not the bottom third of the radio.

 

[evilbrad]

It's been year since I worked on a TV crew doing audio, Broadcast sports international does RF for lots of events like X games Indy car. I think they are a Hytera dealer, maybe DMR audio does not work well for that purpose. When I did PGA shows for ESPN they were using Icom U16s for the announcer pack and GP300s for spotters.

The Icoms had problems with the batteries coming loose so I suggested we use the 300s. For some reason they thought the 300s would not work, I think they had the 300s in 12.5 kHz mode but the repeaters were still wide band. We made the change and had a much lower failure rate.
The Icoms were longer, when the announcer sat in the golf cart the battery would drag on the seat and bend the battery away from the radio.
The 300s are shorter and did not have the same problem since the battery was not the bottom third of the radio.

The video screens where the reporter sees what is being broadcast. And a helper holds carrys them for the reporter how do these work? Freqs?

 

[evilbrad]

It's been year since I worked on a TV crew doing audio, Broadcast sports international does RF for lots of events like X games Indy car. I think they are a Hytera dealer, maybe DMR audio does not work well for that purpose. When I did PGA shows for ESPN they were using Icom U16s for the announcer pack and GP300s for spotters.

The Icoms had problems with the batteries coming loose so I suggested we use the 300s. For some reason they thought the 300s would not work, I think they had the 300s in 12.5 kHz mode but the repeaters were still wide band. We made the change and had a much lower failure rate.
The Icoms were longer, when the announcer sat in the golf cart the battery would drag on the seat and bend the battery away from the radio.
The 300s are shorter and did not have the same problem since the battery was not the bottom third of the radio.

I recall some radio tech /geek guy for bsi or one of the sports broadcast company using a dmr radio but all beĺtpacks and reporters using old motos

 

[speedway_navigator]

Back in my days all we had were 7 2.4 GHz analog microwave channels and some more in the 7 and 13 GHz bands.
Now the COFDM digital modulation has changed that dramatically.

DragonFly V • Vislink

Miniature HEVC HDR COFDM Transmitter

www.vislink.com

One day we turned on our receivers and saw video from a helicopter watching a car driving, figured it was a police unit watching a suspect.
Back in the good old days we shot in car camera video to a copter and sent it back down on a 2nd channel, that limited us to just a few cars.
COFDM has eliminated all that.

You could tell when the car went under a pedestrian bridge or street because the video would drop for a brief time. We used a device called a frame shaker that would detect the signal loss and freeze the last good frame and hold it unit it got sync again.