Re: [RCSE] Berg Reciever and Nimh battery Problem.
Be considerate about low surge capacity (or significant internal resistance) of some cell for HLG for our "weight watchers" out there (you see such label is not limited for our ladies). Look at the tail configuration of your plane. It should be noted that V-tail rudder control simultaineously call for two servo. This stretches the cell capacity that can make things worse. YK Chan Seattle area. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Berg Reciever and Nimh battery Problem.
At 08:25 PM 3/27/00 -0800, you wrote: >I have a (4) servoed Wizard D light with a Berg receiver and I am using a >Vision with (8) model memory. I have had problems after recharge the >batteries and applying power to the receiver with the transmitter already >turned on, the servos go nuts and to full travel in opposite directions. >The battery pack that I made uses (4) cells from a Radio Shack Nimh 9 volt >pack. When I remove any (2) servos, the remaining (2) work normally. The >also seems to work fine using plain nicad batteries. I haven't tried a (3) >Nimh pack yet, but that will be the next thing I try. I haven't looked at >the system current draw to see if there might be causing problem. The NiMH cells from the 9V Radio Shack battery that I tested would not put out enough current to run my system. Very high internal resistance. Ralph Weaver "Science should not be deified Fishers, IN at the expense of truth." USA My site http://members.home.net/rmw00 MTI products http://www.magtechinc.net __ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://im.yahoo.com RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
RE: [RCSE] Berg Reciever and Nimh battery Problem.
Robert, Check the voltage of the pack. If I remember correctly, 4 cells fro mthe 9v pack only come to like 4.6 v or something! Under load this could easially drop to <4v. Add in wire resistance and other load and you can see servos drop off. It is great that people are using 3 cell packs for flying...but realisticly that is not always going to work. receivers were designed to work on 4.8 to 7.2 volts. Designed that way to handle 4 and more recently 5 cell ni-cad packs. Three cell packs with a normal under load voltage of say 4.0v is signifigantly outside of the operating range. In most electronics that I have seen, 2-5% out of spec can create problems. Using a 3 cell pack is over 15% out of spec. It is truly suprising that it works . But anyway, since it works fine with ni-cads, try just using them. I have 2 Wizzards, and both required 110x4cell ni-cad packs minimum to balance correctly. One used 150s. The optimum is the 400mah Lithium metal batteries (2cells, 6 volts, weight of a 5 cell 50mah pack!). Jason Werner -Original Message- From: Robert Massmann [mailto:[EMAIL PROTECTED]] Sent: Monday, March 27, 2000 8:26 PM To: [EMAIL PROTECTED] Subject: [RCSE] Berg Reciever and Nimh battery Problem. I have a (4) servoed Wizard D light with a Berg receiver and I am using a Vision with (8) model memory. I have had problems after recharge the batteries and applying power to the receiver with the transmitter already turned on, the servos go nuts and to full travel in opposite directions. The battery pack that I made uses (4) cells from a Radio Shack Nimh 9 volt pack. When I remove any (2) servos, the remaining (2) work normally. The also seems to work fine using plain nicad batteries. I haven't tried a (3) Nimh pack yet, but that will be the next thing I try. I haven't looked at the system current draw to see if there might be causing problem. Any suggestion would be appreciated. RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
Re: [RCSE] Berg Reciever and Nimh battery Problem.
There were some bad xtals produced, so you might want to check that also. JR are compatible if you don't have other Bergs. Tom Robert Massmann wrote: I have a (4) servoed Wizard D light with a Berg receiver and I am using a Vision with (8) model memory. I have had problems after recharge the batteries and applying power to the receiver with the transmitter already turned on, the servos go nuts and to full travel in opposite directions. The battery pack that I made uses (4) cells from a Radio Shack Nimh 9 volt pack. When I remove any (2) servos, the remaining (2) work normally. The also seems to work fine using plain nicad batteries. I haven't tried a (3) Nimh pack yet, but that will be the next thing I try. I haven't looked at the system current draw to see if there might be causing problem. Any suggestion would be appreciated. -- Tom Broeski -- Afton, VA T&G Exhibits (Exhibit and Prototype Design) http://www.adesigner.com T&G Hobbies (Home of the "Quote") http://www.adesigner.com/hobbies.htm BRASS (Blue Ridge Area Soaring Society) http://www.adesigner.com/brass.htm BRIC (Blue Ridge Inventors' Club) http://www.inventorclub.org 540 943-3356
