RunRyder - interference safety

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Aerial Photography and Video > interference safety

franb
Heliman
Location: Barcelona

Anybody know some system for safety in interferences?

I know scaners.

thanks

01-11-2004 Over year old.

daggit
Elite Veteran
Location: Waseca MN

the new FMA co-pilot is a reciever and flight stabalizer in one that also has the capability to check frequency and voltage.

click the ad on the RR front page.

01-11-2004 Over year old.

HOMEPAGE

Angelos
Key Veteran
Location: nr Oxford, OX11, UK

I proposed a switchover system sometime ago for use with two receivers listening on two different channels I didn’t get the expected response so it never kicked off.

The idea was two have two receivers on the helicopter using two different channels. The proposed system would read all channels from both receivers and control the servos and other devices. If there is interference on one channel the system automatically switches the servos to the other. On the ground you need a second transmitter connected to your primary transmitter via the trainer port.

-Angelos

01-11-2004 Over year old.

ELOSSAM
Veteran
Location: Es

This system was develope time ago by a group named cinecopter
and his bi-band module MDR (http://www.t3a.com/cinecopter/Mdr.htm)
The address does not longer exist either online or in any searching engine cache.
They developed an automatic changing module between two receivers in case of any corrupted signal was received on the priomary one. A second transmiter module was fitted inside a Futaba FC28 and no action was required to switch between both as it radiate on both frq. at the same time
The only difference you can notice between it and a stock FC28 was a double aerial.
The guys from www.helipse.com have used it and I think they was the same team as cinecopter but can confirm it because his URL doesnt work since last week

I´ve access to one of the MDR modules but suppose there is nothing to see inside because the program must be protected and some components with its ref erased (or may be not.... )

Elossam

01-11-2004 Over year old.

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Angelos
Key Veteran
Location: nr Oxford, OX11, UK

ELOSSAM,

This is relatively easy to make. On the transmitter side there are two options…

1. use a second low end TX to transmit on the second frequency. Any 6 channel Futaba computerized or not is fine. These radios will directly transmit the signal from the buddy box connector without performing any modifications to it (like 9C and 9Z does). All you need to do is connect the master TX signal out with the slave TX signal in and lock the trainer switch on the student side.

2. use a Futaba TX module with a small signal conditioning circuit to receive the signal from the trainer port and transmit it. The module and additional electronics can fit inside a little box which will plug on the back of the TX.

The receiver side isn’t too complex either but will require a few weeks work to put something nice together. The idea is to use an FPGA which will read all servo channels from both receivers as well as the packet error signal which available inside the PCM receiver. Every time a packet error is received the FPGA switches the servos to the other RX. This needs some synchronization to prevent truncating servo pulses but it isn’t too hard to do. The FPGA also has enough logic blocks spare which can be used to implement a glitch counter which could tell you at the end of the flight if you had any interference problems to any of the two frequencies.

-Angelos

01-11-2004 Over year old.

FCM
Elite Veteran
Location: Surrey, England

Used with a dual power supply, a double Tx/Rx system should give you the best possible protection against being shot down and surviving a major avionic failure.

I have always wanted to have dual system Rx's on my Camcopter but never realised it was even possible to achieve without major modifications to the Tx's.

I for one would be very interested in having this capablility due to the high value of my airborne equipment. So if the price was right, I would definitely have one off you Angelos, assuming you do decide to make such a system.

Paul.

10-02-2004 Over year old.

Rajun151
Senior Heliman
Location: Houston, Texas

Angelos,
Please count me in as someone who definitely would buy one should you design it.

10-06-2004 Over year old.

HOMEPAGE

Clicky finger
Heliman
Location: Christchurch, New Zealand

About 18 months ago, I was doing a photo shoot for a huge milk treatment station. I was shot down in the worst crash in 10 years of heli photography. I discovered that the milk tankers coming onto the site transmit the information from their data logger about their visits around the farms over a radio link back to a computer in the factory. I happened to be flying almost directly above one of the tankers when it started transmitting. Goodbye helicopter. I have also had an incident since that I've attributed to the same form of interference: that coming from radio telephone equipment. Obviously the frequency they are transmitting on is not the same frequency I am operating my radio gear on, but I am picking that the proximity and strength of the signal they are putting out (in the order of tens of watts) has completely scrambled the heli receiver.

Angelos, if the dual receiver system you are proposing is likely to help in this situation, I too am one who would be seriously interested. It's not only the cost of repairing crash damage, it's the down time and loss of face with regular customers that isn't good.

10-07-2004 Over year old.

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