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Another CH question.
Hi TKG; I see where guy's are starting to run the ignition off a common 1 battery setup. See ignitions on a123 thread. How do you feel CH 7.4v compatible ignitions would work using a lead from the flight pack battery?
Thanks, Arnold |
RE: Another CH question.
Darn Guy,
You taught me somethin'. I didn't know CH made a 7.4v ignition. I had been under the impression that they were all designed to run from 4.8 to 6 volts, with a bit of lattitude either side. |
RE: Another CH question.
I would be very careful. I had my rx and ignition batteries on top of each other and had major RF problems. I use an unregulated 7.4 on my CH ignition with no problems.
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RE: Another CH question.
There is very likely interference on a 72 mhz system. I have only used the single-battery setup on JR/Spektrum with no issues on three setups.
However - I am told by Scott at Brillelli that even the "new" CH Ignitions (RC Excell) are *not* to be operated above 6 volts. |
RE: Another CH question.
Well since Terry is MIA I'll answer the 7.4v stuff. They make a 7.4v ignition. it's stamped on the back use 7.4v only. Terry gave me the go ahead to use a123 batteries on them too. I did have to open the high needle just a tiny bit on the very next flight. Either the ignition is hotter on the a123 cell or atmospheric pressures were way different that day.
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RE: Another CH question.
That's great info to share, altavillian...thanks!
Is it also marked "Rc Excell" in addition to "7.4" ?? That would sure open a lot of folks to be able to enjoy the many benefits of the A123's..... for sure! |
RE: Another CH question.
The CHRCXL is for 4.8v only, some folks are running them on 6v but were not real happy about that.
The CH units that we BUILD here in WY, we can setup to run on 7.4v WITHOUT a regulator or diodes.. The unnameable UAV makers run 5v or 12v depending on their set up, so we make 12v units too. |
RE: Another CH question.
And the answer to my first question Please?
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RE: Another CH question.
some folks are doing ignition and rx off the same pack with no issues. The 2300 packs have more than enough capacity. I'm a little hesitant just yet to go that route, and will continue to use a separate pack for the ignition.
z |
RE: Another CH question.
You should be doing the MOST you can do to prevent RFI, not the LEAST you can do and get away with it. Every short cut you take reduces the range a bit, enough short cuts and BOOM
SO an ignition battery and an RX battery and keep them as far as possible. |
RE: Another CH question.
So Guy, it's two batteries, not one, ya cheapskate;)
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RE: Another CH question.
What I figured, thanks. Let me know when you design a filter. One battery, one switch, one charger, would be very nice. Might evan sell like hotcakes.
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RE: Another CH question.
Once you do a 5 minute recharge at the field you'll be hooked too.:D
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RE: Another CH question.
ORIGINAL: tkg You should be doing the MOST you can do to prevent RFI, not the LEAST you can do and get away with it. Every short cut you take reduces the range a bit, enough short cuts and BOOM SO an ignition battery and an RX battery and keep them as far as possible. |
RE: Another CH question.
ORIGINAL: Bob Pastorello I sure share your concern about preventing RFI. Any suggestions on any measuring I could do to find out if I **am** generating more RFI with my single-battery system? That would probably be good data to collect.... With the ingition battery it isn't so much rf noise. The ignition does NOT draw a steady current, but it takes a big gulp of battery just after if fires to recharge the HV capicator. So you are giving your RX a pulsed DC equal to engine RPM, with a shared battery instead, of a smooth DC. Checking this on an FM RX will give you an idea of the scope of the problem. PCM does better and 2.4 much better BUT the problem is still there just masked. Sooner or later in a higher than normal noise enviroment and when you are low and away BANG your plane is dead. |
RE: Another CH question.
Thanks, Terry. Sounds like a good test to make. Appreciate and respect your insights.
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RE: Another CH question.
ORIGINAL: tkg ORIGINAL: Bob Pastorello I sure share your concern about preventing RFI. Any suggestions on any measuring I could do to find out if I **am** generating more RFI with my single-battery system? That would probably be good data to collect.... With the ingition battery it isn't so much rf noise. The ignition does NOT draw a steady current, but it takes a big gulp of battery just after if fires to recharge the HV capicator. So you are giving your RX a pulsed DC equal to engine RPM, with a shared battery instead, of a smooth DC. Checking this on an FM RX will give you an idea of the scope of the problem. PCM does better and 2.4 much better BUT the problem is still there just masked. Sooner or later in a higher than normal noise enviroment and when you are low and away BANG your plane is dead. Also what is your take when the receiver is behind a power distrubution box such as power expander. They claim filtered power to the receiver. Would the gulp be filtered then? Again, thanks for your help. RDB |
RE: Another CH question.
We check it using nicad Sub C 1500mah batteries. They are the equal of A123 for high discharge rates. No idea about a power box.
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RE: Another CH question.
Thanks very much.
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RE: Another CH question.
An observation I've found.... NiCad's drop voltage under loads more easily than the A123 chemistry. Don't know if it's due to the design or what, but load a NiCad for 1 A and you'll see the voltage drop, the A123 doesn't notice.
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