Copy that Gary👍
Looking forward to your Build Blog on the refurb of Michelle.
(The boat I mean - not the Missus😮)
Carry on Leader!
Bon chance, Doug😎

Thanks once again .The existing serial seems to be superglued in place so is unmovable...hence the new aerial....Will let you know how I get on.

Hi Gary,
Yep, should be.
Most manufacturers use a compromise length, covering between 27 and 40MHz.
So also covering the 35 MHz model aircraft band. It's cheaper (🙄) and simplifies their supply logistics. Difference in range for a boat would be negligible.
Just connect the full length of the new antenna to your red socket and it should shift the resonant frequency a tad closer to 27MHz anyway. No need to open the RX and mess with soldering😉 Personally I would use a gold plated connector (bullet) to avoid potential corrosion problems.
Cheers, Doug 😎

Hi Doug. I have ordered a aerial from a shop which seems much easier to fit and connect, However it says to use on 27 Mhz or 40 Mhz... My transmitter crystal says 26,99 Mhz. Is this OK to use?

Hi Gary,
The white bit should just be a tube with the antenna wire inside.
So with luck you can carefully pull some of the wire down a bit until you can attach the plug easily.
Good luck🤞
Doug 😎

Yep,,will do..the white aerial is very short inside the cavity and my banana fingers are going to struggle to attach the socket and join the wire from receiver but persevere I shall...

Glad to help Gary.
Please don't forget to report back how you get on👍
A vid of the test run would be nice!
Don't forget to do a range check on shore before you get carried away😁
Cheers, Doug 😎

Wow.thanks so much I shall defo do what you said.......Thank you.

BINGO! The penny has dropped Gary 👍 I thought I could see some black wire poking out of the white tube. Put the red plug on that and connect to the socket and all should be well 😀
The black wire coming out of the RX at the opposite end to the servo sockets IS your antenna.
I think the builder has done exactly what I did when fitting a 40MHz antenna to my U25 sub.
To make life easier if he needed to remove the RX for any reason he fitted the plug & socket in the antenna wire. Just as I did when leading my sub antenna out of the watertight hull and up to the removable deck.

How long is the 'white' tube coming through the deck?
At 27MHz the typical 1/8 wavelength RX antenna is 54". The so called electrical length.
Half or so of that is usually in a tightly wound so called loading coil inside the RX case.
So the total physical length of the antenna 'outside the box' should be around 27".
But please not all tangled up inside the boat with other wires and certainly not below the waterline. Keep the antenna wire as far away as possible from the motor and battery wires.
AM receivers are especially susceptible to interference from electric motors!!

Spent 40 years working in radio communications development and system design, mostly for cellular radio and naval ships. So I have some idea about antennas😉
Hope this gets you up and running, and your 'dignal' improves and your cold gets better😁
BTW; your RX is part of a Sanwa Saber RC set, Similar to my 35MHz 6ch Sanwa Conquest.
Cheers, Doug 😎

The external aerial white is not connected to anything there is a red male plug knocking about the cavity .The receiver has a red female plug connected ..I wonder if they need to be connected??

Hi garyp
Looking at the second picture the aerial lead is exiting the rx and appears to be coiled up underneath the rx. The white external pole/aerial would need to be connected to the rx aerial and that may be the purpose of the red socket. I suspect the rx aerial wire need to be threaded through the white external piece. I can see that it is visible below the deck. Might be a bit fiddly and may be easier to accomplish if you can remove the white piece, thread the aerial wire then refit into the deck.
There does appear to be some sort of connector at the side of the rx below the plugs and maybe this is for the red socket. Could be nothing to do with the rx.
hope this helps
dave 976