[ARC5] BC453 on 24V - screen voltage

[J Mcvey]

 Apples and oranges, folks!  I'm doing this testing with 25 and 50 volt B+which DOES impact performance. This radio did perform as Gordon demonstrated running at normal B+ with the dynamotor supply.
Lifting the ground lug on the bottom screen voltage divider resistor helped quite a bit at 25V , but still not back to "normal".



    On Sunday, December 8, 2019, 11:36:46 PM EST, Brian Clarke <brianclarke01 at optusnet.com.au> wrote:  
 
 I'm with you on this one, Ken.

When I was teaching electrotechnology at Sydney Tech, I used Command
receivers to show what could be achieved with a little care in alignment. I
regularly got your figures, though the Command maintenance manual accepts
far worse.

Students brought up on solid state couldn't believe the performance they
could get.

Cheers es 73 de Brian, VK2GCE


On Monday, 9 December 2019 2:59 PM, Ken said to J McVey:

On 9 Dec 2019 at 0:51, J Mcvey wrote:

> At 50V plate I was losing the signal -100dbm (2.24 uv) .
> I think 2uv is the lower sensitivity spec for this radio. anyway!

It might be the "spec", but I measured mine at 1 uV for AM, and something
like 0.1 uV for 
CW. See this video:

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

Ken W7EKB


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