If you can supply me a DX7 for the price of a DX6i I would have no problem with that at all. :)
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If you can supply me a DX7 for the price of a DX6i I would have no problem with that at all. :)
http://groups.yahoo.com/group/armornutsrcarmorhut/message/12404http://groups.yahoo.com/group/armorn.../message/12404
Thank you Woody.
Like I said Leo, it was an observation and may be a freak issue, but it definitely made a huge difference to go from a seperate battery to a BEC.
Out of interest did you measure the voltage because a high current draw (assuming a fixed resistance) may cause a dip in voltage. (Ohms law, if you increase the current with a fixed resistance then a drop in voltage will occur if the voltage regulation isnt up to it)
Again out of interest, what was the voltage of the battery pack?
As this is an easy one to test, I may stick in a 6v voltage regulator and see if it makes any difference to the whole set up with the Roboteq. If it does, its worthy of further investigation, if not then its not worth persuing.
Andy
Capacitor mod, putting a 4700 uF capacitor on the power line to make sure you dont get any brief dips below 3.5v that will cause the receiver to reboot.
http://www.spektrumrc.com/Products/Default.aspx?ProdID=SPM1600http://www.spektrumrc.com/Products/D...ProdID=SPM1600
well we were testing the BR6000 fur use in an antweight robot and wanted to see how far we could push it. As it turns out, the receiver can take a lot more than 6V (at 8V the BR6000 is still fine even), so we could run servos at a higher voltage as well. But when we had it on a steady 5V lab power supply we measured the current draw of the receiver in rest and during servo activity. now we expected with the S75 servo for a drastic increase in current draw. But even in rest the 145mA is quite a lot, over 3 times what my GWS RX did.
Putting a capacitor on receivers is always a good idea in RC branches where a lot of current is pulled. Its worth checking into if it is the problem in Andys case.
Any ideas how the receiver voltage is monitored?
As I said in the DX6i manual it says 4.8V is the minimum. It doesnt mention it in the DX6 manual.
If its monitored from the Tx as part of the software then.................
Out of interest Woody, where did the 3.5V figure come from?
Andy
Well we monitored the voltage during our tests by looking at the gauge on the lab PSU. current we measured with an oscilloscope.
Of course that is more problematic in the field. Still any well charged RX battery (5 cel preferred) should suffice. In a heavy a lot of roboteers used those 6V SLA blocks.
At only 7 grams, the AR6000 receiver is specifically designed for lightweight, electric powered planes and helis. Better yet, it will deliver reliable range exceeding that of any other receiver sold specifically for parkflyers.
Specs
Type:Park Flyer Only
# of Channels:6 Channels
Modulation:DSM
Band:2.4GHz
Dimensions (WxLxH):39 x 39 x 9mm
Weight:7 grams
Voltage Range:3.5V-9.6V
Antenna Length:3.75 in (2)
I assume the BR6000 is exactly the same specs.
It is indeed.
Does anyone have a list of their events how many people use 2.4GHz in their robots and how many are on 40MHz?
Leo,
As I recall, at the UK Champs there were only 3 machines on 40Mhz. (and 2 of those were feathers)
does that mean storm force was the only heavy on 40mhz
yes
your lacking in technology lol
Wasnt edgehog on 40MHz as well?
yes it was :)
It was only 3 or 4 machines using 40mhz, rest on 2.4ghz. I think transmitter control might turn into removable link control. As there is no need to keep the TXs to stop freq clashes, but maybe just links to stop too many live robots testing in the pits?
Mr Stu
I disagree, most of us have spare links anyway. The best way to keep people safe is to have transmitters handed in.
I agree on handing in the TX. I was asking to find out what the ratio 2.4GHz/40MHz is nowadays.
I would say its about 60% 2.4ghz now, almost all heavies are now on it. Most of the 40meg is feathers.
Well there is now an expensive solution of sorts for the failsafe on all channels for dsm2 users who run heavyweights. The AR7100 has an option to put all channels on pre-programmed failsafe settings (just as the BR6000 has).
quote:
Preset Failsafe
When the transmitter and receiver are turned on and after the receiver
connects to the transmitter and normal control of all channels occurs,
if loss of signal occurs preset failsafe drives all servos to their preset
failsafe positions. Some pilots prefer this method but normally
SmartSafe is recommended for helicopters. When the signal is
regained, the system immediately (less than 4 ms) regains control.
Programming Preset Failsafe
During the binding process the bind plug is inserted in the bind
port, and then the receiver is powered up. The LEDs in each receiver
should blink, indicating that the receiver is in bind mode. Now before
binding the receiver to the transmitter and with the receiver in bind
mode, remove the bind plug. The LEDs will continue to blink. With
the control sticks and switches in the desired failsafe positions, bind
the transmitter to the receiver by putting the transmitter/module into
bind mode. The system should connect in less than 15 seconds. The
receiver is now programmed for preset failsafe.
Note: Failsafe positions are stored via the stick and switch positions
on the transmitter during binding.
Before each flying session, and especially with a new model, it€™s
important to perform a range check.The downside to this solution is that the receiver itself is about as expensive as the DX6i transmitter, and way overkill for our purposes.
There must be a way of sorting this out. Surely its just a case of Spektrum changing the firmware in the Txs?
Dave
Well Peter Waller is testing the situation on his setup and so far he came up with this:
quote:
Leo I think my main problem was trying to bind three recievers on one model and that was causing the unbinding problem that I was experiencing even on the 6100.
I have now done about 40 on / off cycles on the BR6000 / DX6i and although connecting is sometimes slow I have not lost binding. I am testing at 6v in case it is a problem with the supply voltage as the 6000 cant go below 4.8v.
I have now done well in excess of fifty power cycles and although a couple of time the system failed to link up recycling the power eventually got link up showing the Bind was still intact.This on the Robotwars101 forum. http://www.robotwars101.org/phpBB/viewtopic.php?p=27576#27576http://www.robotwars101.org/phpBB/vi...?p=27576#27576
I have now completed over 75 on off cycles of my BR6000 the last 15 back down at 5V and still been unable to lose the bind. On a couple of occasions I thought it had happend when it failed to connect in 5 mins but after a couple more power cycles it was again connecting. These test are all done on a stabalised power supply with no large motors switching so it may be that dips in the power rails cause these problems. The time taken to connect means I will not be running my DX6i with a BR6000. As far as ants are concerned the failsafe on the throttle channel which we use for our weapon is enough. Having said I have modified the software in my speed controller to give failsafe on all three channels used. On Binding I not only set the throttle stick fully back but also full back trim then in normal operation set the trim back to centre. This means the failsafe pulse width of the throttle is out side the normal range and can be detected and used to shut down the two drive channels. Hope this is of some help.
Ive had enough with my DX6i now and am now saving up for a DX7. Spektrum should be ashamed of themselves for releasing what I can see is a product still in Beta testing and they should really offer full money back for anyone who has bought a DX6i who wanted to use it with the BR6000 Rxs
http://www.der-schweighofer.at/wg/1337/spektrumhttp://www.der-schweighofer.at/wg/1337/spektrum
They still have some DX6s left, but only mode 1. With thanks to Dirk Karsten for the link.
In fairness to Spektrum the DX6i works perfectly with the AR6100 and presumably other DSM2 receivers and only seems to fail in its backwards compatability with the older receivers. Having said that they are advertised as being compatible and Spektrum are not doing themselves any favours by their apparent lack of action or even interest.
we have spoken to them to try and get a DX7 transmitter and rx set so it would be cheaper(ie like the dx6i with no servos etc) but no uck so far. we will keep you posted.
Guys,
Just launched today at RMP.... The DX5
http://www.robotmarketplace.com/products/0-SPM5500.htmlhttp://www.robotmarketplace.com/products/0-SPM5500.html
Its a basic 5 ch TX... BUT its fully compatable with the BR 6000 RX and its silly cheap too!
Worth a look!
(Message edited by scorpion on August 22, 2008)
Call me a cynic Geoff, but the user manual does not list the BR6000 as a compatible receiver.
Still worth a look though, just a case of once bitten...............
http://www.spektrumrc.com/ProdInfo/Files/DX5eUserGuide.pdfhttp://www.spektrumrc.com/ProdInfo/F...eUserGuide.pdf
Andy
If you check, the DX6 manual doesnt list the BR 6000 either, but experience has shown they work just fine together!
With an asking price of 40 bucks plus a bit of shipping its almost worth getting one just to prove the point one way or the other.
Nice spot Geoff.
On reading the pdf I found this info....
After the system makes a connection, if loss of signal occurs, the AR500 failsafe drives the throttle servo only to its preset failsafe position (low throttle) that was set
during binding.
€ All other channels receive no output pulses/ commands,and are not active during failsafe.
Seems that the AR500 reciever operates differently to the AR6000 .... rather than outputting a valid signal in failsafe it removes the signal thus... IMO ...the AR500 should be compatible with a std plugin failsafe.
Hmmm, i wonder why they never mentioned it to us during one of our recent conversations about the DX6i compatability.
Well enquire about these on tuesday and try and give some a test!
The AR500 should/will work with the DX6i.
Looks like the combo will be available here soon at a reasonable price.
http://www.sussex-model-centre.co.uk/shopexd.asp?id=26392http://www.sussex-model-centre.co.uk...d.asp?id=26392
(Message edited by woody on August 23, 2008)
Geoff,
I certainly would agree there is very little to lose on the DX5 at that price.
Im just dissapointed that the solution seems to be use a very simple controller where you need one tx per model or use a very expensive receiver.
It hasnt really fixed the ongoing problems which probably means that they dont know what the problem is. This then means that future releases, particularly in the short term are IMO suspect until they either fix it or release a DSM2 bot receiver.
Andy
Andy ...The AR500 is a DSM2 receiver and appears to meet our requirements on the failsafe issue.
Well Woody, knowing that would require reading what you had written rather than holding a grudge wouldnt it????
Anyway, just to pour a bit more cold water on it, I spent today playing about with Antweights. Using the DX6i and the AR6100 receiver (a DSM2 rceiver) I was able to recreate quite readily the problem with loosing the bind.
I think as Peter Waller said, the BR6000 connection is very slow and haphazard. With the AR6100 its quick and easy. My set up had a 11.1V 300mAH LiPo and a 2x5 Sabertooth with some Sanyo motors. The set up works fine until you push the sticks to the exterme. When you do this the rx drops out and loses its bind. As I said before, I think this is a BEC problem as it only ever happens on the extremes and its a bit more noticable where it happens when the failsafes dont kick in on all channels. Ill try it with a voltage regulator and see what happens when I get back to London.
I know the DX6i has connection problems with the BR6000. I would say that just because its a DSM2 receiver doesnt mean it will be without its problems. From a pesonal point of view, I can see all our bots going with either voltae regulators or seperate rx batteries.
Another thing Luke pointed out today is that Hydra does this too. This is with the DX6 and BR6000.
So it seems that from ourDX6i working ok with a slight connection problem, weve gone full circle to everything not working properly!
Andy
Sorry, duplicate post, seems my internet keeps dropping in and out.
Damned wifi hotspots!!
Andy
(Message edited by widow twanky on August 23, 2008)
Andy,
As a team we have always used seperate voltage regulators or RX batts.
3 reasons...
1 our machines have remote kill devices in them that remove the supply from the speed controllers so therefore cant use the on-board BEC.
2, I wouldnt trust any speed controller BEC to deliver moere than 100ma reliably and as a DSM1 or 2 RX can easly draw 120ma+ a seperate supply is a must.
and 3, it stops the problem you have described above
Personaly I dont see a problem with using a seperate RX power source, we use these in all our machines
http://www.dimensionengineering.com/ParkBEC.htmhttp://www.dimensionengineering.com/ParkBEC.htm