Transmitter battery mod to Futaba 9 ZAP

[Tony Stillman]

MessageTroy:

Yes, the new 9Z's now come with 1100 mah packs.  

However, most ALL brands of transmitters use the same amount of current to operate.  80% of the current requirements are created by the RF module.  Since all systems are putting out virtually the same RF output power, they are all about the same current draw.  A typical "computer" transmitter will pull about 20 mah more than a "non-computer" transmitter, no matter if it is a 4-channel or a 10-channel.  

What makes most people think they get less flying time is that they don't run the tx down as far as it is designed to go, which is fine.  Most quite flying when the tx gets below 10 volts!  

Futaba does make a "jumper" plug that plugs into the back of the battery pack when removed from the tx.  This will 'by-pass" the diode for fast-charging or cycling purposes.  JR does not have a diode so discharging and fast charging is not a problem.  However, they do have a soldered in fuse that is really a bummer when it blows, because it is not user-friendly to replace without soldering skills.  



Tony Stillman
Radio South, Inc.
3702 N. Pace Blvd.
Pensacola, Fl 32505
www.radiosouthrc.com
800-962-7802
  ----- Original Message ----- 
  From: Troy Newman 
  To: discussion at nsrca.org 
  Sent: Tuesday, February 25, 2003 11:59 AM
  Subject: Re: Transmitter battery mod to Futaba 9 ZAP


  Peter,

  Futaba sells a little jumper than is inserted into the battery output plug when the battery is removed from the TX. This will jumper the diode and allow you to peak charge and cycle the battery but only when it is removed from the TX...This setup works good and you can still have the advantages of the diode. I fly the JE10X now but used to fly the 9Z and I just had spare battery packs...The 9Z had way too small of a battery pack and a really high current drain. The JR 10X is much better in this aspect 1100mah and lower drain...Now I have heard the newer WC2 has a bigger battery capacity but don't know...I never had one


  Troy Newman 
    ----- Original Message ----- 
    From: Peter Pennisi 
    To: discussion at nsrca.org 
    Sent: Tuesday, February 25, 2003 8:08 AM
    Subject: Transmitter battery mod to Futaba 9 ZAP


    I  would like to cycle the battery in my Futaba 9 ZAP WC2. I noticed there is a diode incorporated in the batter pack. Is it ok to bridge or short the diode so that I can discharge and occasionally peak detect charge my transmitter or is there some other way. I am aware of the consequenses of not having the diode there.

    Thanks


    Peter
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