I am looking for the best position of the two receiver aerials for carbon Marblehead. I have tried the underside of the deck patch, but was aware that this was not the best. I have read Lester Gilberts's article also. Is it worth siting in the screw lid of the pot ? I can see little evidence of aerials sticking up on pictures of boats. 

What is the common/usual arrangement ?

Richard

If you are using a pot just blue tack the tails around the top inside the pot or you could use one of these from Sailsetc. https://www.sailsetc2.com/index.php/aerial-arc.html or https://www.sailsetc2.com/index.php/futaba-plug-1576.html

I have one horizontal and one vertical.  I would assume you have the RX aerial horizontal with the Sailsetc thingy.

One day I will do a signal strength check to see if any other way is better.  My RM is never more than about 50 yards away.

Trevor

I did some range testing on some of my kit and another club member's Spectrum (as it was giving problems when sailing).  I tried them in free air and inside a carbon hull.  Although I wouldn't call them properly calibrated tests my conclusions were that the 'quality' of the receiver is far more important than the location of the aerials.  I did some full power range tests on a cheap yellow DSM2 receiver and got about 40m away before it stopped working.  A Redcon receiver made it about twice as far, but my FrSky (FrSky not FLSKY) was still working when I ran out of field - at least three times as far as the Redcon.

Tests with a carbon hull did show that it reduced the range, but only by about 20%.  Although carbon does conduct most yachts have some fairly large apertures in them - basically a Faraday cage with a big hole in it, which is not very effective as an EMC shield.  I think that if you use a quality receiver (i.e. one designed for use in RC aircraft not toy drones / cars then you should be OK.  I tape my aerials under a deck patch but align them at 90 degrees to each other.

After a lot of trial and error we eventually traced the problems with the other member's kit to 2 issues.

1) A dodgy receiver (Spektrum) worked at short range but was unreliable at longer ranges.

2) The transmitter aerial in my DX7.  If you unscrew the aerial cover on a DX7, there is a single grey wire inside, not unlike a receiver aerial.  On my DX7 this had become scrunched up.  Pulling it straight and refitting the aerial cover carefully more than doubled the range.  Might be worth checking if you are having range problems.

Great comments and I will try the Sails etc holders,  Captain Scarlet.

John;  Worth explaining that I have actually no tangible problems, more of a suspicion and doubts. I was using a FlySky, that you mentioned in passing,  on a carbon / Kevlar M and suspected loss of full control at distance.  Do you think I may be better off using my other kit: Futaba T6J-FHSS  TX ? If so I will buy another RX, in which case do you have a recommendation on the RX ?

 

Definitely  worth using the Futaba kit it's probably the most common transmitter used for sailing I use these receivers with no problems at all. 

 

https://www.1001hobbies.co.uk/spare-parts-for-rc-models/132576-futaba-01000658-receiver-r2006gs-s-fhss-2-4g-4513886022517.html

 

https://inwoodmodels.com/product/futaba-r3006sb-6-channel-receiver/