I recently had the need to do some research on Helper Instruments and locate a schematic.?
I ended up overhauling the page at Repeater-Builder.
Does anyone know what Bill Detweiler's ham callsign was??
It's undoubtedly been reissued...?? Neither the ARRL or the RCA have that...
Does anyone know who the rest of the Helper people were? Or what happened to them?
Maybe you have an old business card in the back of a desk drawer?
If anyone has the missing applications notes it would be nice if we could offer them for download.
If all you have is a paper copy we'd be happy to scan it and return it.
The missing ones are:
Everything you need to know about SINAD
Line Measurements Speed Control System Troubleshooting
What the Modulation Monitor Has Missed
Troubleshooting With Your Power Supply
R.F. Voltmeters
Thanks in advance
?
