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ChrisInTheVale

Multiplex 2.4 M-Link Receiver Antenna issues

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ChrisInTheVale

Hi All, I now have two such M-Link receivers (RX-7-DR lights ) which have antenna in poor state of repair (as a result of using external whiskers on my F3F and other carbon models).

One has a frayed antenna and has lost an inch off the other antenna - the other came back from the slope today with the one inch long "silver bit" missing off one of the two antenna. In future I guess I should encase the entire outside whisker section in a thin tube (though this does mean making larger holes in the fuse :mad: ). Are such antenna fixable?

The top silver section in particular is prone to being bent and eventually lost over the course of many landings - At 70-80+ quid a pop - even the "light" version of these receivers are not cheap to replace. I seem to remember reading somewhere that the precise length of antenna and even the precise length of the uncovered silver section at the tip is required to be absolutely precise. :confused: Have you guys ever fixed one of these?

I have seen a video on YouTube of someone buying and fixing replacement coaxial 2.4 antenna for some makes of receiver - but not Multiplex. (I appreciate the absolute top of the range of mpx receivers have replaceable antenna). Do I give these up for lost - buy new and start drilling bigger holes in my F3F's to stick protective sheaths through?

Generally I'm very happy with the Cockpit SX 2.4 - and what it provides for a relatively low cost - but boy the cost of receivers makes up for it.. and I've only ever bought the "Light" series . When push comes to shove - if a very comprehensive range check suggests the missing silver section is not the end of the world - I may keep it in the Flying Fish - but I wouldn't bring myself to have it in the Strega or Air one. Any thoughts / experiences about broken 2.4 antenna welcome.

Chris

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satinet

Mike Ridley can fit new ones.

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ChrisInTheVale

Thanks Satinet

-that was a name I spotted months ago in relation to fixing receivers - and was unable to find today,

I just googled and emailed for info. :)

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Mr Ed

The MPX receivers use the same snap on connectors as everyone else. The only critical bit of the aerial is the exposed bit that stick out of the coax at a bit under 32mm long. Quite how precise this distance has to be I don't know. Here's the inside of a 6ch Rx. IMG_0052.jpg

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swarrans

....and you can buy the replacement connectors from giantcod for next to nothing and replace them yourself!

Simon

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ChrisInTheVale

Mr Ed said:

The MPX receivers use the same snap on connectors as everyone else. The only critical bit of the aerial is the exposed bit that stick out of the coax at a bit under 32mm long. Quite how precise this distance has to be I don't know.

Thanks both – I was not sure if the overall length of the wire was an issue or just the silver end part…The overall length of the damaged ones is about 11cm – these are 15 – but the important end part – I would guess should be the same – I may get these to try. inexpensive and ready to clip on.

http://www.giantcod......05268.html

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satinet

It's the length of the end bit. The service agent will fit a longer aerial if you like.Some 2.4 rxs have a long tail version eg. Jeti

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Mr Ed

Don't be too gung-ho when fitting them. Those connectors are designed for a small number of pluggings.

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f3fman

So is it only "the end bits" that you need to try to get at right angles, rather than bothering to get the whole of the wires in a straight line and at right angles to each other ?

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Austin

f3fman said:

So is it only "the end bits" that you need to try to get at right angles, rather than bothering to get the whole of the wires in a straight line and at right angles to each other ?
That's correct.

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satinet

Yes.

Notice on 2.4 rxs, there is a wide variety of overall aerial lengths but the end bit is always the same length.2.4ghz is a far shorter wave length than 35mh (obviously) so the aerial length will be much shorter.Or are you pulling my leg?!

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AnthonyB

Hi guys, I have exactly the same problem - I need an antenna.

Do the ones from Giant Cod actually fit the Mpx Rx ?

Anthony.

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Adam Richardson

Yes they are all interchangeable as far as I'm aware.

I've even had great success with replacing one with a 1.5 meter one!

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AnthonyB

Thank you Adam, I have ordered some.

Anthony

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AnthonyB

Thanks again Adam, they came today and I put one in - everything great. (Thoroughly tested)

At 1.5m, I would have thought the attenuation would be a little high - obviously not.

Anthony.

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ChrisInTheVale

Hi guys, I have exactly the same problem - I need an antenna.

Do the ones from Giant Cod actually fit the Mpx Rx ?

Anthony.

Also got my last batch from T9 http://www.t9hobbysport.com/item.asp?catid=115&subcatid=238&prodid=598

(only tried the standard length ones - but used them in the RX6 and RX7 and range test seems perfect)

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AnthonyB

Blimey, I never thought of that (I'm stupid) ......... I bought the Electra off Rich + 4 servos + some Mpx stuff.

I rang Gordon's place and was told "it is not a user repairable item" - so I dropped Mpx people because of the availability from Giant Cod.

Anthony.

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Robert099

Can anyone confirm if the long extensions can be used inside a carbon fuselage exiting and set to 90degrees at or near the tailplane?

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AnthonyB

Hi robert, I just bought a few from Giant Cod.

I got some short ones and some long ones ............. The long ones have an extra "bit" on the end - presumably to make it into a full dipole. I just used the short one and have not tried the long yet.

Why would you want to go down the boom ?

If it is all carbon, it is all carbon.

This 2.4 stuff suffers considerable attenuation at longer lengths (probably why they have the bit on the ends of the long ones).

I think it is important to be able to see at least 1 at all times and if all carbon, then it should stick out by the length of the silver bit extra (2 x length of silver) I use plastic tubes.

Anthony.

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Robert099

Anthony

I still use 35 at present and on carbon fuselages I extended the aerial down the inside of the fuselage and form a Y inside the V tails. This system has not given me any problems.

I have heard of problems with fitting the 2.4 aerials whisker style through the fuselage at the front end so I was thinking of doing as I do for 35 and run them inside the V tails. The other option I thought about was to add a small Y shaped support projecting from the rear of the fuselage to support the aerials.

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