What is purpose of the Antenna Bobbin?  
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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> Radio Manufacturer Direct Support >> Hitec/MultiPlex Radios- Ask Hitec Customer Service >> What is purpose of the Antenna Bobbin?
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What is purpose of the Antenna Bobbin? - 6/12/2007 8:05:30 PM   
Ron S



Posts: 1078
Joined: 12/12/2001
From: Fort Worth, TX, USA
Status: offline 		Hi,
I was helping someone with their model yesterday. They are using a 2 receiver setup using a Hitec radio, with QPCM receivers. Both antennas had been wrapped around an item that appears to create a coil on the antennas.

I assume this simulates a base loaded antenna, solely for the purpose of shortening antenna length. They did not have the instruction booklet at the time (as usual! ). The model has not flown yet.

Is operating a large gas model with antenna bobbins a safe idea, or is there a reduction in range?

Since I'm not familiar with these particular qpcm receivers, I figured I would ask Hitec before passing my opinion (which would be to remove them).

Thank you!

_____________________________

-Ron S.
       Post #: 1

RE: What is purpose of the Antenna Bobbin? - 6/12/2007 9:39:28 PM   
A.T.


 

Posts: 592
Joined: 7/20/2002
From: Auckland, NEW ZEALAND
Status: offline
quote:

ORIGINAL: Ron S Hi, I was helping someone with their model yesterday. They are using a 2 receiver setup using a Hitec radio, with QPCM receivers. Both antennas had been wrapped around an item that appears to create a coil on the antennas. I assume this simulates a base loaded antenna, solely for the purpose of shortening antenna length. They did not have the instruction booklet at the time (as usual! ). The model has not flown yet. Is operating a large gas model with antenna bobbins a safe idea, or is there a reduction in range? Since I'm not familiar with these particular qpcm receivers, I figured I would ask Hitec before passing my opinion (which would be to remove them). Thank you!

The "Bobbin" is included so as user can reduce antenna length on helicopters, Indoor flyers, Park Flyers, slope soarers and other models which are not intended to fly at full range.
Instruction card to which bobbin is afixed on receipt:
"Included as an accessory for your new receiver is an antenna bobbin. This device was designed to allow the user the option of winding upto 18 inches of receiver antenna on it, this will shorten the antenna length that sticks out of the model.
NOTE: It is not mandatory that the bobbin be used. To use the bobbin correctly:
1.Start winding the antenna wire onto the bobbin approximately 3-4 inches from the receiver.
2. Do not cross the wire on the bobbin. It should be wound smoothly in a spiral onto the bobbin."

Much more information, with performace specifcs, is available on my web page under "Radio Systems, Accessories, Alterations and FAQ" sub sections "Rubber Duckie, Micro & Whip Antenna - replace long aerials with loaded base antenna" and "Receiver - FAQ, guides and aids to best reception.."

The use of the bobbin or base loaded RX antenna is not recommended in models which can easily use the antenna at full length. In your situation with two receivers, make sure the antenna are not parallel to each other see also the sub section "Giant Scale, Large RC models, Twins & Multi Engines" on my web page and discussions regarding the use of dual RX.

Regards
Alan T.
Alan's Hobby, Model & RC FAQ Web Links


(in reply to Ron S)
       Post #: 2

RE: What is purpose of the Antenna Bobbin? - 6/12/2007 11:06:28 PM   
Ron S



Posts: 1078
Joined: 12/12/2001
From: Fort Worth, TX, USA
Status: offline 		Thanks Alan.
That's quite a webpage you have there, along with search engine. I think I'll take a week off and peruse it!

_____________________________

-Ron S.

(in reply to Ron S)
       Post #: 3

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All Forums >> Radios, Batteries, Clubhouse and more >> RC Radios, Transmitters, Receivers, Servos, gyros >> Radio Manufacturer Direct Support >> Hitec/MultiPlex Radios- Ask Hitec Customer Service >> What is purpose of the Antenna Bobbin?
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