[Milsurplus] RAK-7

[Bill Cromwell]

Hi Richard,

I have not used batteries on my RAK and I have not measured the current 
draw. Thanks for the information. I DO run my "ARC5" comand receivers on 
batteries at 90 volts B+ and I get the same current draw for those six 
tubes, too. I also used batteries for 180 volts (that's a big pile of 9 
volt batteries) with no 'noticeable' difference in performance - I 
didn't not the current draw at 180 volts.  I dropped it to 45 volts and 
it drew just about half of that. Batteries would last longer but the 
performance was down noticeably. I am sure some resistor changes 
especially in the screen supplies would compensate for that but that is 
not on my agenda. Those changes would likely increase the current draw 
and lose the saving in battery life.

Hint - I use 12-volt, rechargeable, sealed lead-acid batteries for those 
hungry heaters. The command receivers require two in series. I also have 
6 volt batteries of the same family made for fence chargers. Good for a 
RAK or SW-3.

73,

Bill  KU8H

On 07/24/2016 08:11 AM, Richard wrote:
> And more...:
> Operating at 180 volts I turned the RF gain full on, and the load 
> increased from 25 ma to 30 ma, but you wouldn't want to operate there. 
> (too loud)
> Operating at 90 volts the load is merely 15 ma.
>
> Richard, AA1P
>
>
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