Long Range UHF RC system now avail on STOCK - Page 13 - RC Groups
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Sep 17, 2008, 05:02 AM
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thomasscherrer's Avatar
yes exactly if you use my UHF RC system that opperate at the frequency band this antenna is designed for, you will get extended range if the antenna is mounted hight and free
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Sep 18, 2008, 04:35 AM
Registered User
thomasscherrer's Avatar
I have updated the web page with temperature tests:

Temperature range: -40C to +70C tested (-40F to 158F)
I have tried to all combinations with the climatic chamber.
RX inside, TX inside,
RX inside, TX outside
TX inside, RX inside
outside means room temperature near chamber about 25C
I used a wired RF connection and attenuator to check sensitivity (range)
while I temperature sweeped the unit inside the chamber,
I found only minor degrade at +70C :-)

so this means you can use this systen in hard weather conditions !
only thing I recommend is to protect the boards against water/humitity
to be safe, can be done with varnish or coating specially designed for PCB.
all boards I supply are NOT protected against moisture,
since I have newer seen any problems with that.
Last edited by thomasscherrer; Sep 18, 2008 at 07:22 AM.
Sep 19, 2008, 03:00 AM
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Impulze's Avatar
Is the black cable from the UHF module PPM in?

Sep 19, 2008, 04:05 AM
Registered User
thomasscherrer's Avatar
please see here Matte:
so the manual knows it all :-)

The TX needs only 3 signals : GND=shield, +supply=red, PPM=black.
Sep 19, 2008, 04:10 AM
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Impulze's Avatar
Thats what i thought

Ahh..found it now in the manual

Sep 19, 2008, 05:47 PM
_helitron_'s Avatar
Only 14 days ago I ordered a starter kit from Thomas and today it was on my workbench already ! All goodies were very well packaged and arrived me in good condition. Beeing a hard- and firmware developer since 30 years, I can only say all parts are absolutely professionally manufactured and are looking pretty good. In the next few days I'll do then the first tests with the system and I'm very curious already. First testbed for Thomas' system will be then my AttoStar+, an EasyStar with EasyGlider wings and AttoPilot 1.6 for RTL (without FPV at the moment).

Attached some pics of Thomas' UHF system and the dedicated testship.

Cheers, Erwin
Last edited by _helitron_; Sep 20, 2008 at 05:34 AM.
Sep 19, 2008, 06:16 PM
No guts no glory
pratorian's Avatar
received my system today as well! it looks awesome, I'm installing it in one of my trex 450s at the moment hopefully i can test it tomorrow if the stupid wind dies!
Sep 19, 2008, 06:28 PM
Registered User
Impulze's Avatar
I have also received my system, already installing it in my easyglider

Sep 19, 2008, 07:03 PM
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tychoc's Avatar
You guys make me jealous. I haven't ordered mine yet, but I'm getting close!

Sep 19, 2008, 11:41 PM
No guts no glory
pratorian's Avatar
I resurrected one of my Trex-450s (previous FPV tests with 72mhz pcm were hard on my trex fleet) re-installed a 2.4ghz video system and my new control receiver from Thomas.

Everything looks great on the ground, I can see the signal switching from one antenna to the other when I move the tx around. I tried to fly the trex visually a few minutes ago but all I've managed to do was to almost crash it into a passing car (uhm yea.. flight testing a newly rebuilt heli in the middle of the street at 11pm is not a good idea)

servos response is really fast, I cant feel any lag.

First FPV tests this weekend hopefully!

Many people have asked me to post some pictures of my FPV trex 450, here are some. Sorry quality sucks, lighting is bad and for some reason Sony decided to put a million buttons and functions on my camera...

Does my antenna setup look ok Thomas ? Is it a problem to route the antenna in plastic tubing like I did ?

let me know what you think

Sep 20, 2008, 04:16 AM
Registered User
thomasscherrer's Avatar
thanks for all the nice words :-)

>servos response is really fast, I cant feel any lag.

exactly, this system is specially designed with low lag as a design goal !

please try to see if the 8bit resolution is detect able ?
and if it is feel able when flying ?
many pages ago we talked about the resolution vs update speed, please read that section to get more info.

>Does my antenna setup look ok Thomas ?

it looks perfect ! you have understood the 90 deg mounting rule,
so now your ground station will always see one antenna.

both of your antennas are mounted HORIZONTALLY and that is also fine
if your ground station antenna is also mounted horizontally,
I suggest to range test it carefully as suggested, with your TX mounted vertically (the worst possible combination) and if you can feel any delay like a short hold, then try to note the range from you, and then try to change the tx antenna to horizontal,
in will in teory give you 26dB better link budget to hold both antennas SAME polarization.

> Is it a problem to route the antenna in plastic tubing like I did ?

it is a good idea, it will hold the wires nice straight

also please read about the failsafe !
how to set that up smartest when flying helicoters ?
on a plane it is easy, motor off and go weak to the left,
but on a heli, what about motor speed ? and pitch in case of FS ?
just think a bit about this. and you can demo this by removing your tx antenna will give you a really short range, then you can check how the FS works and hos you have cnfigured it,
maybe be sure the heli cant lift off :-)
Last edited by thomasscherrer; Sep 20, 2008 at 04:25 AM.
Sep 20, 2008, 04:58 AM
_helitron_'s Avatar

I'm very curious already about your experience with the heli. I've also planned to equip my helis (T-REX 450SE, T-REX 600CF, Joker CX) and my quadrocopter with Tom's system but for the first tests I thought it's better to take a simple plane ! Additional advantage, my AttoStar+ comes back to me automatically when something goes wrong with the UHF R/C connection with the help of the installed AttoPilot !

Good luck for the first FPV testflight with your little Rexxy and take care on passing cars !

Cheers, Erwin
Last edited by _helitron_; Sep 20, 2008 at 05:47 AM.
Sep 20, 2008, 06:22 AM
Registered User
thomasscherrer's Avatar
see here:

with an angled BNC adapter on the TX you can rotate
and angle the antenna as you like to make plane and tx antennas align
to give best possible range using that little antenna.

I think such adapters is easy to find world wide.
Sep 20, 2008, 09:13 AM
_helitron_'s Avatar
I've a lot of such thingies laying around from the ancient coax PC networks.

Sep 20, 2008, 09:20 AM
Registered User
thomasscherrer's Avatar
good point, and those network coax cables with BNC can now come handy :-)
they are most often RG58 or something similar 50 ohm,
you need that to connect to the booster,
if you mount a large antenna up hight and free, you might want to use thicker coax (lower loss) or put the TX box or booster near the antenna to save coax loss
and get all your power in the antenna.

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