Having used battery power for a long time I concur with the previous post.. I have a FT-847 that runs fine down to about 10.8 to 10.9 at which point it just cuts out. (display blinks on & off and signal goes to crap) No noticeable damage to the rig. Pretty much the same results on a FT-1500 mobile rig.
Look at the specifications page in the manual.. My 847 for example states 13.8 volts +/- 10%
So 13.9 - 1.38= 12.42 Now I know it will go quite a bit below that but they have to be conservative with their figures.
If you have a variable power supply find your critical cutoff voltage and plan to stay above it.
In my experience with any radio.. the worst that has happened is I lost my programmed memories on a FT-2600.
YMMV but in my case 11.5 to 15.5 seems to be a decent voltage range.
Last edited by N1MLF; 03-23-2011 at 01:01 PM.
Reason: fat fingers on a laptop Grrrrr
[CENTER][FONT="Times New Roman"][SIZE="4"][B]It's not the [I]"class of license"[/I] that an amateur holds..
It's the [I]"class of the amateur"[/I] that holds the license.[/B][/SIZE][/FONT][/CENTER]