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HomeAircraftHelicopterRadio - Servo - Gyro - Gov - Batt › Quick Whip antenna test
11-02-2004 09:18 PM  13 years agoPost 1
raptorbasher

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Bristol, England

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Hi All,

Does anyone have a quick uk whip antenna which they could run a small test with for me?

Use a multimeter and check if the aluminium base is connected electrically to the whip itself.

Mine was giving poor range and just checked this but am unsure how the design should be, connected or not?

just touch the probes between the tip of the whip and the exposed aluminium flutes machined in the base

Many thanks


Tim

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11-03-2004 08:26 AM  13 years agoPost 2
Colibri

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The Netherlands

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I have one lying around and if no one beats me to it I will do this for you tonight. I would be surprised if it was connected though.

Tim

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11-03-2004 07:55 PM  13 years agoPost 3
nicco

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Sweden

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The base it is connected, so you need to isolate it from the chassie. I also having problem with the range and I don't think that 35MHz is good for theese short antennas.

I will throw my in the bin and use a standard antenna, I have learned the hard way. I lost the heli 10 feet from me...

/N

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11-03-2004 10:18 PM  13 years agoPost 4
Colibri

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The Netherlands

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I can not measure any connection between the antenna and the chassy using my multimeter (DC resistance).

But I would recommend mounting it electrically isolated from the frame because it is really close to the antenna.

Tim

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11-04-2004 09:55 AM  13 years agoPost 5
raptorbasher

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Bristol, England

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Thanks guys,

On mine the aluminium base is connected to the whip, and probably by the grub screw in that small hole?

had it on a raptor, so insulation from the frame was not an issue, but it gave me poor range. Dunno what I have been doing wrong cos many people dont have any trouble?

Will try it again on another rx and see what happens

Thanks

Tim

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11-04-2004 01:31 PM  13 years agoPost 6
nicco

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Sweden

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I have been looking in pictures helis that had Revelotion Whip Antenna installed and most of them has mounted them in a terrible way (antenna very close to aluminium/carbon chassie), but they had no problem reported.

BUT all of these was using 72MHz. In 35MHz the wavelenght is twice as long as 72 and requirers twices as long antenna for the same recipient...

I think the Quick UK has to short antenna to working good.

There is another manufacure called HeliMast that makes a longer whip antenna. I have not tried that one.

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11-04-2004 01:49 PM  13 years agoPost 7
Colibri

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The Netherlands

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Since yours and mine behave differently and you are having problems I would send QuickUK a message to ask if it should be connected. Mine is new and never used.
BUT all of these was using 72MHz. In 35MHz the wavelenght is twice as long as 72 and requirers twices as long antenna for the same recipient...
The 72 MHz antenna is also too short but I thought the length of the antenna is simulated in the electronics so that the Rx 'sees' an antenna of the right length. The electronics in the 72 and 35MHz versions could be different to compensate for this.

Also I don't think the standard antenna on a 72MHz Rx is twice the length as on a 35MHz Rx so what exactly is the right length?

Tim

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11-04-2004 09:58 PM  13 years agoPost 8
nicco

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Sweden

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It should be connected. I have asked QuickUK.

The electronic is different between the versionen. The receiver is getting the proper compancating and dampening, but still, it's should be twice as long as the 72MHz version.

/N

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11-05-2004 08:40 AM  13 years agoPost 9
Colibri

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The Netherlands

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Are we talking about the same thing? A connection between the anodized aluminum housing and either the tip of the antenna or the connection at the bottom?

The tip is connected to the connection on the bottom but on mine neither is connected to the Alu housing.

I can not believe the housing should be connected to the antenna and my mutimeter says it is not.

Maybe somebody with experience in radio transmissions and reception can give his opinion about this. And maybe somebody else can measure his antenna as well?

Tim

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11-06-2004 11:44 PM  13 years agoPost 10
raptorbasher

rrApprentice

Bristol, England

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Hi,

Tim, yes I am talking about the aluminium body, in this case the blue anodized part, being electrically connected to the tip of the whip.

It maybe just that the grub screw in the hole has bitten through the heatshrink covering on the whip and made the connection, and as you say yours is new and not connected so maybe it waers through with some use??

You are probably right suggest I ask Quick uk if this is the case.

on 35Mhz our antenna wires are the same length as the 72 Mhz wires, because we are not using a wire which is tuned by length, but by the inductor in the rx, and the inductor in the base of the whip is just matching the whips short length to the rx. a normal wire for the rx is between 30 and 40 inches, no matter what channel of freq band used.

That said though, on 35 mhz we are going to have less gain and more noise due to the doubled wavelength.

Thanks

Tim

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