freeair

Guys, i just purchased a JR 10 chanell spcm receiver and its fitted with an aftermarket base loaded whip type aerial which i must say is a very neat unit. just wondering if you guys use these for planes as i know there quite common on heli,s, my main concern is range compared to the original full length wire aerial fitted to all stock FM receivers on the 36 meg band. thanks.

bfreee

im using one i got from a heli guy too, it works fine on my park flyer as far away as i care to fly it, say 1000ft. Good luck. mine was 72 mhz.

bruce

gadix

My Feedback: (2)

you mean a "jet" like antena???
i think that each antena have it's own length you need to cut from the original one

make u sure you do the right thing...double check your self prior flying!

freeair

guys, i found out the brand of this antenna; Quick U.K. is it good or no good ?

gadix

My Feedback: (2)

gooday
Quick U.K. is a well known HELI parts and accesories shop

cheers

Rodney

Check out RC Cam's web site for some good info on what happens when you change the factory designated antenna length. In almost all cases you will lose range, almost always cut it in half or less. Fortunately, most of the users, modern receivers are good enough so that this loss of range is still okay for most users.

deckerv

My Feedback: (21)

I trust mine on my heli's.. but not my planes. I'm somewhat paranoid anyway

Skarn

I use a micro antenna on ALL of my RC aircraft heli's and planes. I have never had an issue and I tend to fly my planes as far out as I can see just about....

Skarn

s3nfo

My Feedback: (14)

That's what the "base load" on a base loaded antenna does, makes the base loaded antenna electronically the same length as the normal antenna. I've never experienced a loss of range with a base loaded whip.

modeltronics

My Feedback: (27)

A base loaded antenna loads the transmitter the same as a full length quarter wave antenna. Basicly it fools the transmitter into thinking it has a full lenght antenna. The answer to the question, "does it radiate as will as a full length antenna is NO. Can you tell the difference? That is up to the sensitivity of your receiver...and they are not all the same.

I have some that I have fooled with in front of a spectrum analyzer on my bench. Just looking at the signal strength of a transmitter with a loaded antenna on an IFR7500 I can see it is lower. I do know that there are some FCC rules in the USA about making changes to any part of the transmitter (including the antenna) but I don't think the FCC is going to send the police after you I never used one for flying because the full size antenna never bothered me.

Pete

freeair

what i have gathered with this base loaded rx antenna is the total length from the rx to the antenna tip is 500mm and i know the original JR antenna wire is 1000mm, so the base loading must make up the other 500mm. when i set this up i will do a tx antenna down range check plus a tx antenna full up test and compare this with another JR radio set i have . my other slight concern is say if this rx antenna is mounted on the top of fuselage facing straight up , what could happen if say i do a knife edge with the models antenna facing away out of sight from the tx ?

BarracudaHockey

My Feedback: (11)

The jet guys use them as well as the helo guys. Quick UK is TOP of the line. Install it and do a range check from all orientations and with the aircraft properly restrained with the engine running. If those checks are good, I wouldn't fuss about it.