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cfe7

Hi-tech research in the Arctic :-))

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Hi-tech? Not at all, but still entertaining and educating....yes!

I have often wondered how far away I could fly my airplane, and I guess you’ve been wondering about this too.

Well, yesterday I had to find out some more about it. With the kind assistance of a RC friend I took the trip across a local fjord to perform some tests on RC range.

For those interested, here are the results:

The RX was put into a plastic box. That means no electric motors running and no video TX present. No known RC activity in the area either. The only transmission was my RC equipment and mobile phones.

Distance between RX and TX 9830 m over salt water

RX ca 30 meters ASL

TX ca 35 meters ASL

RX: Futaba 9C 35 MHz

TX: Futaba DC R149DP 35MHz

Standard vertical antennas:

Full and half length: excellent

Antenna collapsed: Some glitches but flyable

TX antenna pointing at vertical RX antenna:

Full length: excellent

Half length: Some glitches but flyable

Collapsed: not flyable

I've heard some people suggest a RX antenna with double length should improve range. This was also tested. No kind of tuning or calibration was performed.

I found that the long antenna decreased range by 40-50 %

Next weekend I’m going to do the same test with electric engines running (Twin Star) and video TX present.

I’m eager to see the results.

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Distance between RX and TX 9830 m over salt water

That's quite a distance! I was never able to attain that range with RX close to the ground, only going directly up ;) I did have 20-30% improvement when I used offseting ground leg on receiver (not doubling the aerial length but using same length wire connected to the ground).

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Hi Terry!

As you can see from my first post I had full control.

This is a copy from my first post:

Standard vertical antennas:

Full and half length: excellent

Antenna collapsed: Some glitches but flyable

TX antenna pointing at vertical RX antenna:

Full length: excellent

Half length: Some glitches but flyable

Collapsed: not flyable

When excellent is indicated I had full control.

I'm going to repeat the test soon with electric motors running.

Edited by cfe7

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Yep, I read it but thought I may be reading it wrong, that's way further than I have got on 35mhz.

Terry

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