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Old Sep 08, 2008, 12:27 PM
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thomasscherrer's Avatar
Danmark, Hovedstaden, Ballerup
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thanks for all the nice words.

yes loop the PPM out on the top of stuff to do with the software
when I get a few days with out 100% work load :-)
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Old Sep 08, 2008, 06:30 PM
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Torrance
Joined Feb 2005
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edit....
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Old Sep 08, 2008, 06:35 PM
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hoysome's Avatar
Alberta, Canada
Joined Jun 2008
817 Posts
justone, look at his site. his recievers use diversity with 2 antennas. with them oriented perpendicular to eachother one will have a solid signal while the other is in its dead zone. the reciever picks the ant with the best reception.
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Old Sep 09, 2008, 01:57 AM
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_helitron_'s Avatar
Austria, Stmk., Neudau
Joined Jun 2006
823 Posts
Thomas,

is there any log function in your receivers currently (or planned) for failsafes ? Here in my flight area are five mobile phone transmitter towers in a radius of approx. 500 - 1000 m (we've a huge amount of them in our country) and I know some "dangerous" spots in the air where there are always short interferences with 35 Mhz R/C when a plane passes it. Would be very interesting for me how is the behaviour of the 4xx Mhz receivers there and with a log in the Rx it would very simple to check this.

Erwin
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Old Sep 09, 2008, 02:30 AM
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Hi Erwin, we had actually a megabit eeprom glued onto the first receivers,
after flight we could see rssi levels and errors and failsafes and antenna switch selections,
all that code have been removed after we have verified the receivers functions.
I dont want to add the code again, due to timing and all sorts of bad things that can happen, also the receiver core code is now tested and verified to perform good and stable, fooling arround with it, might add unlucky things.

I have an idea: take the UHF system and find out the range without antenna on the tx,
make a few tests on your field or garden, be sure the results are almost the same,
take an rx one servo and a 4 x nimh pack in your hand, and check if you have the SAME range just near that antenna tower you are affraight of,
then you know if they send out bad carma waves :-)
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Old Sep 09, 2008, 04:03 AM
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_helitron_'s Avatar
Austria, Stmk., Neudau
Joined Jun 2006
823 Posts
Thomas,

thanks for the fast answer. It's a pity that the code is removed but I understand your point, never touch a running system . Will do some extensive range checks before flying of course as always with new equipment.

Btw. how is the behaviour of the Rx in case of an interference/failsafe, I assume it holds the last position of the servos, yes ? Or are the servo outputs programmable for the case of a failsafe as on a PCM Rx ?

Erwin
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Old Sep 09, 2008, 04:54 AM
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>Btw. how is the behaviour of the Rx in case of an interference/failsafe,

oh hehe you reveal you have not read the manual ?
or it is not explained clearly in the manual :-)

just kidding :-)

>I assume it holds the last position of the servos, yes ?

YES, in case of bad data pakage the last good will be used
and error counter incremented, when a good pakage is received the servo positions will be updated, and error counter zeroed.

>Or are the servo outputs programmable for the case of a failsafe as on a PCM Rx ?

YES, when error counter > the max alllowed, it will recall the stored failsafe settings
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Old Sep 09, 2008, 05:49 AM
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_helitron_'s Avatar
Austria, Stmk., Neudau
Joined Jun 2006
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Thomas,

maybe I'm blind but I've only found in the manual

"Failsafe will be activated if TX is turned off, or if out of range for 1 sec,
it will resume to normal if signal comes back."

but no description what is happened in case of a failsafe .

Maybe there is a newer manual anywhere ...

Erwin
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Old Sep 09, 2008, 07:21 AM
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ok I admit it, the explaination in the manual was a bit short,
you like my more detailed explain in post 157 ?
I will be happy to but that in the manual instead, makes a bit more sense,
but is also a bit more technical.

add: a constant error data stream for 1 sec will activate the failsafe,
one single good data will update servoes and zero error counter.
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Old Sep 09, 2008, 08:03 AM
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Danmark, Hovedstaden, Ballerup
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Antennas:
several antennas with BNC type connectors exist accessable worldwide
that will increase the range when compared to the short 1/4 wave whip
(supplied in the starter kit)

to name a few:
Comet RX7 BNC
Comet SH-95 BNC
BNC-24 (really long)

the Comet CH-32 can be used to shorten the range like for indoor,
or normal visual flights, only 1 inch long.


Patch:
I have been looking a bit on patches but they are quite narrow band
and will move their resonant frequency alot when they are close to metals and such,
so until I find the "perfect" type I can not recomment it, but again it depends on the frequency band you use and the antenna type, they must match.

Yagi:
3-6 elements are small and cheap and can be made wideband enought to handle 430 to 450MHz at the same time, they improve the range a lot, when pointed to the plane, note: becareful to use same polarizing on ground and plane.
http://www.active-robots.co.uk/433mh...nna-p-553.html
a 9dB gain antenna will make your 500mW emit like 4W !
or your 7W booster to emit like 50W !
remember to double check antenna frequency range
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Old Sep 09, 2008, 08:36 AM
Multicopter/FPV/UAV/HAM
_helitron_'s Avatar
Austria, Stmk., Neudau
Joined Jun 2006
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Thanks Thomas !

Erwin

Quote:
Originally Posted by thomasscherrer
ok I admit it, the explaination in the manual was a bit short,
you like my more detailed explain in post 157 ?
I will be happy to but that in the manual instead, makes a bit more sense,
but is also a bit more technical.

add: a constant error data stream for 1 sec will activate the failsafe,
one single good data will update servoes and zero error counter.
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Old Sep 10, 2008, 05:39 AM
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just updated the manual
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Old Sep 10, 2008, 06:30 AM
Multicopter/FPV/UAV/HAM
_helitron_'s Avatar
Austria, Stmk., Neudau
Joined Jun 2006
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Great, thanks Thomas !

Btw. you should got a new customer from Germany today (email-friend of mine), sent him a hint yesterday about your system .

Erwin
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Last edited by _helitron_; Sep 10, 2008 at 06:37 AM.
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Old Sep 10, 2008, 09:56 PM
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Joined Sep 2008
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hey I not that good with all the vocabulary of the this project, but apparently it as you put a "kick ass system" which i need to increase the range for my RC plane.....for longer range FPV flying......but I only want to order what I need, I dont think i need everything in the starter kit to extend the range of one RC plane,,,,, unless i do, u tell me lol...........


But I only want to order the components i am gonna use/need.....could you compile a list of equipment that I would need in order to achieve a range of 5-7k....and also how much that list of equipment will cost.....

I think somewhere in your post you said that you need some type of information to configure it for us.....well i live in the u.s. (florida) and i cant tell you how i would want the components configured because I dont know the diference, lol,,,,,,,so i would just ask you to configure it to what you think would be better for me.......

As far as payment goes?...........how do I make a secure transaction with you?

I am very interested in this equipment so please contact back soon.....thx!
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Old Sep 11, 2008, 04:38 AM
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please read post #1
http://www.rcgroups.com/forums/showt...5#post10304916
it is just updated with all the info you need,
and please read carefully the webpages linked to on page 1
and also this thread will give you alot of usefull information about this system.
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