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RF Tally System


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#1 Martin Stacey

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Posted 28 August 2012 - 04:31 AM

I have been toying with this idea for a while now but finally got around to putting together a prototype for proof of concept. I do a lot of broadcast work with wireless cameras so I have built a transmitter system that can be attached to the top of the sled/camera with a photocell sensor for the camera. When the camera tally light is on it wirelessly transmits a signal to a reciever that can be placed anywhere around the base of your sled or monitor with leds to indicate tally.

I intend to test it out fully this weekend but thought I'd share the results and a few pics once I've put it through it's paces but all initial tests seem to be positive.

If I remember rightly there was a fellow op on here that was building something similar a few years back but he seems to have dissappeared along with his system so I thought I'd give it a go myself. I know there are some relatively low cost options out there and this cost a little more to build but I really wasn't keen on having to run a cable down the outside of my rig if I could avoid it.

Cheers,

Martin
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#2 Thomas K. Jensen

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Posted 28 August 2012 - 09:58 AM

I'm interested.
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#3 Martin Stacey

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Posted 29 August 2012 - 04:04 AM

Here is a little video of the prototype. See if you can spot my deliberate mistake while demonstrating this. :blink:
Video Demo
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#4 Mohamad Faiz

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Posted 29 August 2012 - 09:32 PM

Nice work dude.... I'll be in line if you have it up and running.... But the powering of the receiver.... Saw u power it up using a 5 pin lemo.... Is it posible to run power via d tap or another 9 volt battery system??? Btw love the way u forgot to plug ur battery on to your sled system.... :)
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#5 Martin Stacey

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Posted 29 August 2012 - 10:33 PM

Is it posible to run power via d tap or another 9 volt battery system??? :)


The receiver is native 12-18volts. I powered it from the 12volt output on my sled just because I had a spare cable laying around. I think if I made these up as a kit I would probably just throw a 4 pin xlr socket on it so you can use anything that you want to feed the 12volts into it. I could make it with a lemo socket but that wouldincrease the cost considerably.
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#6 Mohamad Faiz

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Posted 29 August 2012 - 11:52 PM

Yup great idea.... A d tap or xlr is best solution.... Both are cheap and relatively easily available how about transmitter only 9v option ???
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#7 Martin Stacey

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Posted 30 August 2012 - 03:12 AM

how about transmitter only 9v option ???

At this stage it is a 9 volt battery for the photocell relay but the transmitter is running on a A23 12volt battey internally as I built a lot of it from off the shelf parts to an extent but I am looking to integrate the power for the transmitter and the photocell together which will be 12volt. This version is really just a proof of concept and so far I am happy. I tested the transmitter to about 150' so that was a small bonus as it could be setup in a studio etc. when you have no return telemetry on the camera by connecting to the vision desk telemetry directly.
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#8 Mohamad Faiz

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Posted 30 August 2012 - 04:55 AM

Nice job... I am in the queue line 1nce it is for sale..... :)
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#9 Martin Stacey

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Posted 30 August 2012 - 05:39 AM

Well I've got a full day outdoor OB on the weekend so am going to put it through its paces then. Will let you know how it all turned out.
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#10 Martin Stacey

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Posted 02 September 2012 - 04:26 PM

Put the system through its paces on Saturday and it worked flawlessly all day. The only issue I had was the
sensitivity of the photocell wasn't quite right but I adjusted that at the start of the day during camera checks and was fine for the rest of the day.
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#11 Mohamad Faiz

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Posted 02 September 2012 - 07:57 PM

Well it worked... Can i place my order now??? Lol....
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#12 Martin Stacey

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Posted 03 September 2012 - 02:38 AM

Si I guess I need to start work on the final configuration then

Attached Files


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#13 Martin Stacey

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Posted 07 February 2013 - 01:54 AM

Ok, so this has taken a bit longer than I hoped but I got rather busy in the months leading up to and including Xmas but I've finally managed to put a 12v version together and am about to Beta test it this weekend. If all goes well then all of those that have contacted me about buying one, I will hopefully have some good news for you.
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