Whats the correct way on running a seperate RX pack and switch on a 120HV?

[celm]

I want to add a RX pack and switch for back up incase my 120HV fails and i can do bench work w/out arming the ESC. one will this over load the Vbar and i will be using teh 120HV internal BEC as well

[Lajon]

If you have the Jive BEC at 5.6V (the default) then just connect a 4 cell NiCd/NiMh buffer pack with switch in parallel with the BEC (i.e., using an unused servo output on the receiver or on the V-Bar). A Y cable works also. The Jive will charge the buffer pack but you should not let it charge it to any great extent in flight really (so full or near full charge when flying). After extended V-Bar setup sessions with the Jive off or when the heli has been unused a while I charge the buffer pack with a charger. A simple rx battery monitor (e.g., led ramp type) is useful to check the buffer pack status. I have this setup on 2 helis (both with V-Bar) and no issues.

Note that if you have the BEC at higher than 5.6V this simple setup is not ok (according to Kontronik anyway).
/Lars

[celm]

Originally Posted by Lajon

If you have the Jive BEC at 5.6V (the default) then just connect a 4 cell NiCd/NiMh buffer pack with switch in parallel with the BEC (i.e., using an unused servo output on the receiver or on the V-Bar). A Y cable works also. The Jive will charge the buffer pack but you should not let it charge it to any great extent in flight really (so full or near full charge when flying). After extended V-Bar setup sessions with the Jive off or when the heli has been unused a while I charge the buffer pack with a charger. A simple rx battery monitor (e.g., led ramp type) is useful to check the buffer pack status. I have this setup on 2 helis (both with V-Bar) and no issues.

Note that if you have the BEC at higher than 5.6V this simple setup is not ok (according to Kontronik anyway).
/Lars

do i still hook up the slave wire?

[ZuvieleTeile]

Originally Posted by celm

do i still hook up the slave wire?

Yes, because it carries half the power for your system and servos.

[celm]

so pretty much do it like this

[bmclaurin]

Yep. Or if you run a separate RX (e.g., Futaba), you could run it to there. Nice call on the buffer pack. I have one as well, as I like the redundancy for such a mission critical component. It also can dampen/absorb feedback voltage from certain servos that can cause brown outs on some FBL controllers (although vBar seems to be able to recover from these better than others from what I've read).