What has been discussed here is the Antenna. If you look at
different Receivers, you will find that they will have different length wire for
a Antenna. Some receiver have coils on the board going into the matching stage
of the receiver. This is where they match up the Antenna to the first stage of
Amplification. Some just go into the matching input and there they are
compensated for. So just looking at the wire and adding 1/2 or 1/4 the length to
the wire onto it and thinking your doing things correctly, your wrong in that
respect. But just the fact that you are adding wire, that is a good thing. The
better the receiver can see the Tx Ant. the better it works. Just like what
Gordy say's. "No signal no movey :-)"
If your Fuselage is made up with carbon tube or a fuse that has
carbon weaved in with Kevlar or Fiberglass its going to bock the receive signal
by some degree. Just think of it as sliding your receive Ant. wire down a copper
tube. It won't receive much, but if you have some that dangles out the end it
will get more signal maybe enough to do the job. Its not at a certain wave
length that has to be there to work. We are talking Receiver now. Transmitters
is another story. The RF signal from a Transmitter travels at the speed of
light. It is crossing the receiver wire Antenna and is creating a small AC
voltage. The more wire you have the more voltage is being created on that
wire.(SIGNAL!!!)
You will get to a point that the resisents will be to hi to be
over come by the voltage created. We are now talking Long wire!!
Transmitters on the other hand have a different type of problem with the length
of the wire. If its not tuned correctly to the proper length there is a
reflected signal going back to the electronics from where it came from. This
reduces the over all output power to the Transmitting Ant. The bouncing back
signal is out of phase with the one coming out of the electronics. It
cancels it out by a small amount or and can damage the output of the transmitter
if its a large amount. Most people remember about the Tuning of a Antenna
and about the reflected part back when CB radios were the in thing " Good
Buddy" A bad Ant, open or shorted coax would burn up the output
circuit.
I just add wire to the receiver Antenna and just let it extended out
the back. Longer is better. Problem solved with carbon fuselage Free info here
no Lab expense required. Just my 45 years of experience working in Radios for a
living with some EE Collage studies, Trade School Grad from Devry, and a FCC
license to work on High Power radios,Military Ground and Aircraft schooling. I'm
still working in it.
Larry Taylor KF6JBG
CD for the Visalia Fall Soaring Festival 2005 Oct 1st & 2nd Home: [EMAIL PROTECTED]
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- [RCSE] fuselages & radio range, Antenna Stuff Larry Taylor
- Re: [RCSE] fuselages & radio range, Antenna Stu... Paul Emerson
- Re: [RCSE] fuselages & radio range, Antenna... Larry Taylor
- Re: [RCSE] fuselages & radio range, Ant... James V. Bacus
- Re: [RCSE] fuselages & radio range,... Larry Taylor
- Re: [RCSE] fuselages & radio r... James V. Bacus
- Re: [RCSE] fuselages & radio r... Simon Van Leeuwen
- Re: [RCSE] fuselages & rad... Larry Taylor
- Re: [RCSE] fuselages &... Dick Barker
- Re: [RCSE] fuselages &... Larry Taylor
- Re: [RCSE] fuselages &... Dick Barker