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Problem with Skysport 4 transmitter TV4F
Hi there Doug
sorry for the delay in replying, your knowledge and replies are much appreciated. What I have been doing the last day and a bit is, going through my
and checking all their batteries and what I have found is that I have two which are 'duff' and they are the slow drain type. Its got me thinking. Due to the fact that we don't charge these often, is this one of the reasons that the cells are prone to deteriorating? Be interesting to see if anyone else has had this problem. I am going to go back to the standard battery pack for the
because I had 2 old ones in the drawer and they have charged straight up and replaced the one in the 4 channel transmitter that was duff and everything seems hunky dory now, or , seems that way - so it will be a test on Sunday to see if I get a greater range :-)
3 months ago by JOHN
Mixing throttle and rudder
I did this, well sort of, by using the settings in my transmitter, which at the time was a spektrum DX6i.
You use dual rates, and exponential settings, I would imagine most modern 2.4 sets have this feature.
In simple language, dual rates (D/R) will limit the throw, so by experimenting you flick the switch, and all of a sudden you have limited the throw of the rudder, flick it back for slower speeds and you have full movement.
Exponential (expo) nulls the centre stick movement, and is generally on the same switch, so it makes the stick (rudder) in your case less sensitive, so easier to use at higher speed.
Just remember though, most
and receiver have aeroplane terminology, so, if your rudder is right stick, this is labelled as the aileron in the instructions, menu and so on
3 months ago by pmdevlin
futaba radio and receivers
I have been using Futaba 2.4 for years, be aware there are 2 systems, FHSS and FASST, they are not compatible, except with some of the high end
which work with both systems.
As to other type compatible receivers, i have Corona and Orange, a lot cheaper than Futaba, they do work, but, as Dodgy said, you might lose some range, look for the ones that are surface receivers, 'air' receivers depend on height for there range, also beware of park fly receivers, they are very limited range, park or indoor.
It all depends how many channels you need to use.
if you need more info give me a shout
3 months ago by jarvo
Thanks for the link Fred👍
First thread I looked at 'Submarines and 2.4GHz' is a timely warning!
Read it and you will understand why I have a stock of 40MHz RXs from Standard to Pico versions. And why I bought all the 40Meg crystals I could find locally a few years ago.
I also have two MC-10 40Meg
plus the 40Meg job that came with my Southampton tug. Southampton is being converted to 2.4Gig leaving that TX free for my subs😊
Cheers, Doug 😎
BTW: I think this should be a good source of 40Meg sets, tailored to submarine use😊, for some time to come. This guy is a specialist who does ONLY sub stuff.
3 months ago by RNinMunich
Help and advice please
Comes from 30 odd years of designing COMMS systems for naval vessels, including submarines.
Did several surveys of submarines for refit designs.
At 6'2" I'm not built for working on subs, kept bangin' me 'ead! 💥😭🤕
whales have the advantage that they are transmitting directly into water, where sound travels about 4 times faster than in air at sea level. And they can do this mechanically, process still not fully understood, at very low frequencies from around 2Hz to 100Hz mostly. Hence the long ranges achieved.
Up to maybe 24kHz for short range echolocation - nosh hunting!😜
Interestingly, spectrum analysis of Humpback whale sounds shows an FM type structure with pulsed modulation. Just like our FM RC
We have to transmit first through the air, for several thousand kilometres in some cases, and then have enough energy left to penetrate down a hundred metres or so.
We have to do this electrically, hence long antennas. Wavelength = Speed of light / frequency in Hertz! Do the math - it's a long chunka wire!😮 Halfwave at 8kHz ~18.75km.
Happy whale listening folks,😎
PS; JB, you can always use the antenna for a spot of fly fishing - while waiting for your sub to come up again!😮
4 months ago by RNinMunich
Transmitter Mode 2
I think you can buy kits to spring load the second stick on certain