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Author Topic: RX airial lead  (Read 2773 times)

Guy Bagley

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RX airial lead
« on: August 07, 2007, 11:39:19 am »

recently had to do a repair to one of my boats,  this involved adding adhesive to a pretty unnacessible location in the bow of the boat.... all was going well ... or so i thought


but unknown to me at the time   i managed to drip some adhesive form the underside of a part onto the very end of the RX airial lead which was laying low down in the front of the boat low down along the keel line !

problem now is i have a receiver i cannot remove from the boat as its bonded into place with the antenna lead !!

if i could see the offending glue blob ( which i cant as this would require the whole front deck to be removed) then i could sort it....i can feel it when i bury my arm into the bow of the boat !!!!

 but the stabilit express is well and truely dripped onto the antenna,there is a lump about the size of a 2 pence coin covering the antenna....  is there a debonder for stabilit ? or can i remove the antenna lead from the RX and replace it with another ?
i know the length is critical,  is this possible to chop off the old antenna and solder in another successfully with out affecting radio performance?- is the wire a certain type size/ grade ?

the reciever is one of my well loved fleet  units ... and so is not really replaceable !

any ideas anyone.... its not proving to be a major issue its just changing  xtals in the RX is now done totally by touch alone as i cant drag it out into the open as its glued in !!!!
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Colin Bishop

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Re: RX airial lead
« Reply #1 on: August 07, 2007, 11:49:41 am »

You can chop off part of the existing aerial lead and splice on an equivalent length with flexible wire of similar thickness. As long as the total aerial length is pretty much the same as the original you shouldn't have any problems.   :)
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malcolmfrary

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Re: RX airial lead
« Reply #2 on: August 07, 2007, 12:14:10 pm »

Receiver aerial length in model control applications is not really critical as long as it is not too short.  An error on the generous side is unlikely to do any harm.
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FullLeatherJacket

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Re: RX airial lead
« Reply #3 on: August 07, 2007, 12:23:33 pm »

i know the length is critical,  is this possible to chop off the old antenna and solder in another successfully with out affecting radio performance?- is the wire a certain type size/ grade ?
the reciever is one of my well loved fleet  units ... and so is not really replaceable !

Guy
If you have another similar Rx then just measure the length of the aerial on that and duplicate it on the glued-up one. Either 7/0.2 or 10/0.1 multi-strand wire will do. Don't pay more than about ten pence for it!
FLJ
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Colin Bishop

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Re: RX airial lead
« Reply #4 on: August 07, 2007, 12:46:18 pm »

I have a Fleet  XP-FM 40meg RX and the aerial length is 35 inches (89cm)
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John C

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Re: RX airial lead
« Reply #5 on: August 07, 2007, 02:02:04 pm »

Just had an RX re-ariel'd by my local model shop because of a similar incident, Cost £1

John C
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Guy Bagley

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Re: RX airial lead
« Reply #6 on: August 07, 2007, 02:32:06 pm »

MANY THANKS, I KNEW YOU GUYS WOULD POINT ME IN THE RIGHT DIRECTION..... I JUST CANT BELIEVE I COULD HAVE DRIPPED THAT AMOUNT OF 'SURPLUS' ADHESIVE DIRECTLY ONTO THE AIRIAL....IT SEEMS THERE IS TWICE AS MUCH BONDING THE AIRIAL TO THE KEEL AS I MIXED UP FOR THE ORIGINAL REPAIR, MAYBE STABILIT BREEDS WHEN YOU ARE NOT LOOKING !!!!!

 SODS LAW APPLIES HERE A DIRECT HIT ON THE ANTENNA, I BET IF I WAS ACTUALLY TRYING TO STICK IT TO THE KEEL IN THE BOW ( IN A CONFINED SPACE) THE ADHESIVE WOULD BE NO WHERE NEAR !-= BUT NOW I CAN CHOP IT AND REPLACE  IT, MANY THANKS FOLKS














!
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Ghost in the shell

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Re: RX airial lead
« Reply #7 on: September 15, 2007, 01:09:45 pm »

normally i make the radio reciver the LAST thing to go into a boat, that way I can route the antenna and hold it in place with sticky tape, either double sided, to which I have 2x 300mm diameter rolls! or insulating tape
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roycv

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Re: RX airial lead
« Reply #8 on: September 15, 2007, 01:43:48 pm »

Hi all, I usually cut my receiver aerials off at about 3 -4 inches and put a gold plated plug on.  (very slim from my old computer days)  so all my boats have a fixed in aerial with a socket and you can swap the Rx's. I have not noticed any difference between 27 and 40 Mhtz!   Aerial length is not very critical at less than 100 yards range.
regards Roy
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Ghost in the shell

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Re: RX airial lead
« Reply #9 on: September 15, 2007, 01:57:50 pm »

speaking about rx antenna length, why is it that the R114F is shorther than the R136F antenna?

they're BOTH 40mhz FM receivers made by Futaba, ones 4ch ones 6ch
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malcolmfrary

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Re: RX airial lead
« Reply #10 on: September 15, 2007, 02:53:45 pm »

Because it is :-\.  There might be a consideration that the 6 CH one has a shorter reset time between the trains of data and has had its response tweaked.  One could have a later design of RF front end that works better with a shorter aerial.
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