I got some 1.13 coax cable 42" with 2 female ends from a company named data alliance, . I striped the end to match the 324rx and got 2 antenna for like 5 bucks. I ordered 4 so that's 8 antenna shipper for like 30 bucks. Thanks Grim for introducing me to the 324
Daniel, I would love to see your antenna setups and range test results!
Please provide that when you get a chance. (Bty.. just so everybody knows.. the longer antenna does not provide any further RANGE.. just more opportunity for reception in all or odd conditions)
Team Futaba marine recommends the 400mm antenna in RC marine applications.. (but.. choose as you might!)
on we go!
Grim
The internal antenna left down in the hull is no different than leaving the external antenna down in the hull. Either one is better up high but it wasn't even about that when I did it it was about fixing a receiver that the foil internal antenna was corroded. The internal plugs in with same connector so I plugged a second one in and routed it nicely in the receiver and out through a notch and grommet in the case. Merrily stating what you can do and it does work. It was more of a repair than a performance modification for me. I sure as heck wasn't having range problems or I would have tried those foot and a half long antenna first. Lol.
These were R603FS Fasst receivers and I have no idea if the new stuff is even designed the same to do that. The fasst receivers will be in use for a long time yet and adding a second wire antenna will fix a receiver with a rotted foil internal antenna. Futaba doesn't fix them that is for sure. Never did even when they were still in production. They just tell you they can't fix it at all and maybe offer you a discount on another new one. A $3 short antenna can fix it and you don't even have to run it up a second tube. Just leave it in the box but at least both are good functioning antennas again.
How can you preach 400mm antenna to get it up and then wonder how the internal one if run up would not just maybe be just slightly better than left down in the box. Again please remember the thousands of R603FF single external antenna receivers that functioned identically to the R603FS diversity dual antenna receiver. Most likely because that internal one buried in the hull isn't doing all that much for you.
It isn't even ever the static range so much that your after anyhow as that is already awesome what your doing is trying to ensure you don't have a intermittent glitch from the system because of water roost, electronic interference or whatever. But of course, that is hard to measure so we rely on range increase as a indication but it surely isn't telling the whole story as with the link to transmitter being interrupted is not exactly the same as how far it goes in normal conditions. Robust connection that doesn't drop out when conditions aren't normal. Futaba has the best protocol of them all IMO already.
When your flying drones way out is when the range really matters. Have flown them out so far that it is literally a spec you don't see change of direction unless you travel a few hundred feet or so so you can see which way the spec in the sky is going. Futaba never let me down. Guess what antennas are on the factory Futaba receivers. TWO coax wire ones. HMMMM !!!! Who would have thought they would have Futaba diversity dual antenna receivers from the factory with both coax external antennas? That's just a crazy design. Lol.
As for polarization of the tip being 90° to the other once the boat is running the tube lays back most the time any how so they end up polarized differently all the time. Surely could put a tight smooth 90° bend at top of tube with a little heat and solid wire inside keeping it round until it cooled.
Check out all the FUTABA 2.4 ghz receivers for aircraft that use two coax wire antenna. Now which do you think they are trying to get more range out of ? A surface or air receiver ? In any case they make dozens of 2.4 ghz receivers with two wired antennas. All of them are that way actually.
Why ? because it works and because aircraft fly out WAY further than a boat ever does. Hence two coax cable antennas for max range and interference rejection you get with increased reception.
The one internal and one external on Futaba receivers was for convenience of installation and simplicity and because they already have more range than usually even needed like that. I mean really what is the "advertised" range of even a Diversity receiver. A couple or few hundred feet is all. Not sure if they have a advertised range on aircraft receivers but bet it is a few feet further. Planes and drones fly with every orientation there is from the antennas when installed in aircraft in proper orientation which isn't super critical as I have seen them laid out parallel to each other and still get awesome range. Way further than you can see to still fly it. I used to fly the drones with leds on them at night at ranges in the miles we have done the FPV with Futaba radio too.
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