[Milsurplus] Re: GB> Operating the TBW Transmitter on the #800-1 800 Cycle Rotary Inverter

[Richard Brunner]

Dave said:
> These "bats" that you are referring to are commonly called "duct-board" 
> they are run through a scoring machine so that they can be folded into a 
> self insulating duct. They are available from heating and A/C  supply 
> houses that stock duct work fittings and such. They and the proper tape to 
> affix them together are not cheap. The Aluminum tape (the last I bought) 
> was $7.50/roll.

The "bats" I bought are semi-rigid, unfaced, with one side more solid than 
the other.  They could be used for duct liner, but are not self-supporting. 
I think duct-board would have the same acoustical properties, but more 
expensive.  I couldn't find an HVAC supply house - maybe they're secret.

Also, upon further reflection, I do not think the inverter reactance is 
varying with input voltage, or the capacitors would have a different effect. 
I think it's a matter of excitation and carbon pile settings at the specific 
input voltage.

Richard Brunner, AA1P