[Milsurplus] RAK-7

[Richard]

More:  I turned the voltage down to 90 volts, turned the regeneration up 
a bit, and it works fine.  Further, I shorted the 90 volt input to the 
180 volt input (now 90 volts) and the regeneration point is the same as 
at 180 volts.  Conclusion - it doesn't matter.
On 07/23/2016 08:50 PM, Richard wrote:
> I measure 25 ma at 180 volts from a regulated supply to the RAK, with 
> no VR tube.   Further, there is a resistor from 180 volts to the 90 
> volt input, so if you're using a regulated supply you don't need the 
> dropping resistor and VR tube.  They put about 30 ma through the VR 
> tube to regulate a half milliampere  load, which is absurd.  160 to 
> 180 volts seems to be the sweet spot. Above 180 volts it's too hot, 
> and below it slowly goes to sleep, but at 90 volts it's still very usable.
>
> The ac-dc switch is double pole single throw shunted with removable 
> links.  The IB says don't open the switch with the links open because 
> the ac supply is disconnected and may be damaged. The book mentions dc 
> operation with a 6 volt battery and 180 volt B battery, but there is 
> no discussion how to do it.  You would have to make connections to the 
> load side of the open links as there are no battery input points, and 
> remember to keep the switch closed for ac operation.  Apparently it 
> was a rare occasion... So, use the regular input points for ac or 
> battery operation, but not both at the same time.
>
> Richard, AA1P
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mailman.qth.net/pipermail/milsurplus/attachments/20160723/46570b9e/attachment-0001.html>