[ARC5] Receiver Sensitivity - Power Supplies

[Kenneth G. Gordon]

On 25 Apr 2018 at 23:11, Scott Robinson wrote:

> Hi Bill,
> 
> I'm curious: how did you measure the sensitivity? Wat do you mean by 'CW 
> sensitivity'?

I suspect he means with the BFO on. When I measured the sensitivity of my own restored 
receivers, there was a considerable improvement in sensitivity when the BFO was on when 
compared with it off.

For a BC-453B, AM sensitivity was 1 microvolt, and with the BFO on it was 0.3 microvolt, 
although MDS sensistivity was 0.1 microvolt.

See this youtube video:

https://www.youtube.com/watch?v=vlz83QXM66A

The main thing that low (and very low) plate voltage does is reduce the audio power output 
level very significantly.

The RF levels are not effected to the same extent.

Ken W7EKB

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