[TenTec] DC Power Supply Backup

[info@immigration.nu (Paul Christensen, Esq.)]

> Has anyone ever done anything like this?  Is it even
> necessary or is there enough residual energy in the PS
> filter caps that brief interruptions (typically <10 sec) are not
> a problem?

I have an Astron RS-35 and there's not enough stored energy in the filters to 
keep my Omni Six powered for more than a second or
two.

I once tried your idea with success in a different application but it required 
the use of two steering diodes to isolate the RS-35
from over-charging the battery.  A resistor in parallel with the battery's 
steering diode can supply enough trickle charging current
without over-charging the battery.  High-current Shottky diodes are best for 
this application since there is less than 0.7 volts
dropped across the diodes.

-Paul, W9AC