Gliders > Slope Soaring

Which Radio

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Ron:
Hi again all,

Sorry I've not been around the forum, or anywhere else, for quite a while.
Family illness problems involving a lot of shuttling between here and the UK. Now looking a lot better.

This year I have a big 'old wooden boat' job to do, and have decided to keep her ashore for the summer to stand a chance of getting everything shipshape by next year.
Only boaty fanatics would understand that, I know.

So now the time has come to re-assess the model flying situation, and what it boils down to is - start again.
And by that I mean new sailplanes, and new radio too.
And that's where I need advice from all you guys.

Now I've been around radio comms nearly all my life (ex radio 'ham', and worked in digital/packet radio since it was invented), so the new 2.4GHz systems look interesting. Except - they work on a public radio band.
Yes I know frequency hopping and digital pairing takes care of a lot of problems. But we fly from the tops of hills, often near relatively high-powered transmitters, and all 'built-down-to-a-price' equipment is deficient in the RF department, especially when it comes to excluding unwanted signals, even out-of-band ones.
Then there's the vastly different 'line-of-sight' characteristics from the frequencies that we normally use, not to mention the higher absorbsion rate of heather clad humps that always get in the way!

So - what are your opinions of 2.4GHz as applicable to sloping?
Anyone used it yet?

And on radios in general, whether 2.4GHz or 37MHz, is there a transmitter that can be set up by plugging it into a laptop via USB maybe?
It would make it a lot easier for setting rates and couplings etc. than ploughing through all those menus on a tiny LCD screen.

And.... (do go on a bit don't I. Sorry) for a 37MHz radio, is there a decent synthasized one, and not just the transmitter.
Carting loads of crystals about is a pain, and when you have some single conversion RXs and some double conversion it gets even more confusing.

Your opinions would be very welcome.
What do you use and what do you think of it?
If you were changing, what would you go for?

Happy landings. :D

Ron

Ron:
Interesting info here:

http://www.multiplex-rc.de/cms/vorschau/upload/sonstiges/2_4_GB.pdf

So think I'll leave the 2.4 GHz stuff.

Ron:
Oops.
Typo...
Of course I meant 35MHz not 37 :(

cvanscho:
Hi Ron

Good to "hear" from you again!  Sorry about your family illness, it must be a very trying time for you.

I have no experience of 2.GHz, so I'm not qualified to answer.  From my own perpsective, however, I am not ready to move over, as I remain unconvinced that it is fully tried and tested under all conditions. I do know there are "issues" with aerial placement within all-carbon fuses, but maybe that isnt going to worry you too much right now :roll: !

One of the big advantages of 2.4 is the freedom to fly when there are a lot of fellow flyers around, there's no waiting for your frequency peg to come free, etc.  Obviously that is not a major concern for me, I'm more concerned with finding someone to fly with now and again!

Obviously radio choice is a personal thing, and people are likely to recommend what they use themselves.  Still I'm going to stick my neck out and say that I sincerely don't believe there is a set close to the MPX Cockpit SX right now that will give you such a range of features for a very reasonable price.  Features include full synth mode (compatable with synth or crystal receivers), channel check, "no rf transmission" programming mode, aileron and flap off-set to allow increased movement of those surfaces by off-setting the servo arms, automatic suppression of aileron differential when engaging spoilers, etc. etc.  They are particularly powerful sets for gliders, and very easy and intuitive to programme for a hopeless "non-nerd" like me.  Limitations are 7 channels, and 20 model memory.

I have bought a MPX EVO9 with the idea of replacing the SX, for four reasons only:  more model memories; more channels (for when/if I get big scale models one day); the ability to assign any function to any control and channel (servo); which means that you can often use a smaller Rx than what you need for sets with fixed channel assignments; and the ability to change settings whilst in flight (for instance, adjust elevator compensation for spoiler braking mode). It is possible to leave one setting or mixer open for in-flight adjustment with the SX, the evo however allows you to open and close two parameters in flight.

I don't think the SX can be set up on your PC, although sofware patches are expected to be introduced and can be downloaded and installed via your pc.  I have a computer cable for the evo, which I have used to upgrade and reset the set to factory settings (I bought it 2nd hand), but again I dont know if you can set up a model via the pc (that doesnt mean it can't be done).

TBH the programming of the evo has eluded me completely to date, if I don't get it sorted soon I'll probably sell it again and get a second SX!

My tuppence worth :roll: !

Cheers

Chris

Fred:
Hi Ron, sorry to hear about your family illness  :(  Hope all is going to go well now !

Well, you have an answer from Chris...
But you will have as many opinions as you have modelers !  :D

Quick thing regarding the 2.4Ghz... Multiplex is at a wait and see state (well, there friend from ACT took the wagon before them... Long story, but seems that pi** them off a little  :P  :wink: ) as we are waiting for a new European legislation about our use of the 2.4Ghz... So far, not confirmed, but our use of the 2.4ghz is certainly going to be restricted at best... Wait and see !
But the 800mhz technoligy is around also..
For me, I keep my good old system, flying far from me often, and the risk of losing the signal is real in these conditions...

Anyway, as a radio, a cockpit is a good choice... You also have the Graupner MC/MX 12 in this kind of range.
Personnaly, I have a MC18, never had a problem, very reliable, and now running on lipos (I haven't charged it for 3 months now !  :D  :D ). I also have a Royal EVO9 synthese (great with synthese receivers ! Just find a free channel, and off you go !) but I don't use it much.. (going to change...)

All that to say, that the day I find a MPX 3030, I'll go for it ! Certainly one of the best radio of all time !  :D  :D

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