Robotwars101.org

Craig_Anto3 · Joined: 17 Feb 2002 Posts: 1209 Location: England

I bought 4 and 2 work 2 dont have swapped them round and same problem so will speak to Giant Cod
_________________
MSc

muchalucha · Posted: Thu Jul 29, 2010 3:33 pm Post subject:

If i get the broken radio back, could i borrow someones giant cod rx at an event jsut to test whether it will bind to a known workign rx. These thigngs seem to have a more than 50% failure rate !?!!??! Howeveer nobody seems to have had problems with the old type t4u radios. Looks like tis back to good ol 40 mhz for a while. btw can i use 35 mhz at an antweight event ?
_________________
Fight or flight ... ?

...suicide

Joey · Posted: Thu Jul 29, 2010 4:24 pm Post subject:

You can as long as your ant flies

35mhz is restricted by law to flying models.
_________________
Joey McConnell - Team Picus Robotics
"I appear to have built an antweight with rather advanced artificial intelligence - with the emphasis very much on the bit in Asimov's laws about rejecting orders and going strange"

muchalucha · Posted: Thu Jul 29, 2010 5:36 pm Post subject:

ah ok

. http://www.giantcod.co.uk/corona-24ghz-module-dsss-ct8z-p-404735.html Ive been looking at these diy kits as another very cheap alternative for going 2.4 ghz, seems like you can jsut take the ppm output from your 40 meg tx to! And under 20 quid!
_________________
Fight or flight ... ?

...suicide

peterwaller · Joined: 15 Feb 2002 Posts: 1727 Location: Aylesbury Bucks

I have received the new Tx Rx pair and tested them out and they bind and work correctly. The Tx is a T4EU and it behaves as far as I can tell the same as my T4U. I have now run tests with three receivers two standard receivers running a Park HPX F servo from a 5v power supply and one in one of my modules driving a pair of motors. In each case I switch on with the bound transmitter and checked it was working then switched off the Tx, switched on the other Tx pushed the bind button and checked it bound correctly. This was repeated until each receiver had alternately bound to each Tx 5 times. Once on each of the two unmodified receivers it took a second press to get a bind one with the T4U and the other with the T4EU. Otherwise all binds worked correctly and I didn't even power down the receiver in between. In fact the first receiver was tested with my Spektrum DX6i running next to it as I had left it on by mistake. This may not help much if you have one that wont bind but at least it looks as though once you have a good working setup they are fairly consistant not that you normally need to rebind them unless operating the same receiver with different transmitters.
I must be lucky all 5 of mine seem to bind OK.

muchalucha · Posted: Thu Jul 29, 2010 9:55 pm Post subject:

Thanks for doing the tests pete

. Must have been unlucky

, as you own both, are there any differences between the t4u and the t4eu as far as biding procedure ?
_________________
Fight or flight ... ?

...suicide

peterwaller · Joined: 15 Feb 2002 Posts: 1727 Location: Aylesbury Bucks

Actually I don't own both it is one I am modifying for someone to left stick operation. As there is no way the transmitter knows that the receiver is binding to it (ie no button on the Tx pressed) they must repeatedly send the transmitter ID code in the normal operational information. The receiver then when the bind button is pressed must find that ID and store it in nonvolatile memory. As far as I understand it the information is not sent as a series of 1 to 2 ms pulses but as a serial data stream which looks too complex to work out unless I can find the information published some where.
The mod to left stick proved quite easy just swap the centre wire on the two up down pots and then repeat on the two left right pots. Move the up down spring from the right stick to the left and the ratchet from the left stick to the right. That way the built in mixing still works correctly.

muchalucha · Posted: Fri Jul 30, 2010 4:02 pm Post subject:

cool thanks for the info

_________________
Fight or flight ... ?

...suicide

peterwaller · Joined: 15 Feb 2002 Posts: 1727 Location: Aylesbury Bucks

Just a thought those who have had a problem what voltage are you running the receiver on.

muchalucha · Posted: Sat Jul 31, 2010 9:40 am Post subject:

I stuck mine on a 4.8 v receiver battery at first but when it all wasn't working i charged it up to dead on 5 volts

. It did also seem to work ok on 3.7 V however i don't know if the 2.4 module was functioning correctly.
_________________
Fight or flight ... ?

...suicide

terminaldamage · Joined: 20 Jan 2010 Posts: 31 Location: Irvine, Scotland

I've been running mine on a 4.8V receiver battery. I've yet to try it out again with the packs fully charged but will hopefully get that done tomorrow and report back on the findings.
_________________
Jamie McHarg
RogueTwo Robots
www.rogue-two-robots.vze.com

With great power, comes great reliability.

terminaldamage · Joined: 20 Jan 2010 Posts: 31 Location: Irvine, Scotland

Well just given it a test and it's still not working. I'm just going to order a new receiver tonight for it and hopefully that should work. Just for reference, my transmitter is the T4U version.

I'm also going to order that Corona DIY conversion kit that Tom linked to in an earlier post as I have two very good 6ch Futaba transmitters sitting about that I don't want to see become redundant next year with the enforced 2.4GHz feather ruling. I'll try that out and give my verdict.
_________________
Jamie McHarg
RogueTwo Robots
www.rogue-two-robots.vze.com

With great power, comes great reliability.

muchalucha · Posted: Fri Aug 06, 2010 2:30 pm Post subject:

The corona 2.4ghz dit kits have fantastic reviews so i would be very intersted to how good they are as i also have a few redundant 40 mhz sets lying around. I got a message from rob at giant cod today and he said that the main encoder board(?) had been replaced and that it was now all working great, they are sending the set back to me and where extremely helpfull. So be sure to send your faulty sets to them before you buy new receivers !
_________________
Fight or flight ... ?

...suicide

terminaldamage · Joined: 20 Jan 2010 Posts: 31 Location: Irvine, Scotland

Oops! I've already bought a replacement and chucked the broken one

Oh well, at least if it happens again I know to send it off first.

With regards to the Corona 2.4GHz kit, from the bench test I did tonight it works very well. There are indeed good reviews of it, particularly of the more recently sold units as they seem to have removed a few little glitches. I've not failsafe or range tested it yet but I hope to do so over the weekend.

I've done a little write-up-sort-of-thing on the FRA forum, with links to several forum threads I found particularly useful; if anyone wants a read, here's the link:

http://www.fightingrobots.co.uk/forum/viewtopic.php?f=3&t=3458
_________________
Jamie McHarg
RogueTwo Robots
www.rogue-two-robots.vze.com

With great power, comes great reliability.

muchalucha · Posted: Wed Aug 11, 2010 2:52 pm Post subject:

Got the repaired tx back from gc today, took a while but its working and they didnt charge me anything for it. Now its working, what a great radio this is for 30 quid!
_________________
Fight or flight ... ?

...suicide