[ARC5] Receiver Sensitivity - Power Supplies

[Scott Robinson]

Hi Bill,

I'm curious: how did you measure the sensitivity? hat do you mean by 'CW 
sensitivity'?

Regards,

Scott Robinson


On 4/25/18 10:10 PM, Bill Pileggi wrote:
> I'd like to point out some sensitivity data I posted to the group about 12 years ago, but possibly as long as 15 years ago...
> 
> Power supply to receiver - approx. 50 volts DC B+; Filament 6, 12 or 24 volts as appropriate.
> 
> Receiver - fully aligned per instructions. RF Gain grounded - maximum.
> 
> Vacuum Tubes/Valves - All tested good.
> 
> 3-6 or 6-9.1 Mhz. receiver, either ARC-5 or SCR-274N series.
> 
> CW Sensitivity - under 0.3 microvolts.  Signal Generator - HP8640B.
> 
> No modifications to circuitry, repaired as necessary to operate. Never saw a point in modifying the screen voltages from the voltage divider, or any other change. I've restored an awful lot of receivers and transmitters in the last couple of decades, and when done properly, they were all like this...
> 
> Bill KA3AIS
> 
>