[ARC5] 10 meter BC-454 a bit more

[Geoff]

Now all you need is a 6CW4, 6GM6 or 6EH7 (or SS) preamp to find another 
layer of signals and crank the 12SG7 gain back a bit.

Im not at all surprised at the 454 performance since it is missing all the 
loss associated with a bandswitching receiver.

All you need now is a simple AM/CW TX to enjoy the coming 10M E season DX. 
Time to hack an ARC5 TX maybe? A carrier control audio stage can be built 
right in.

Carl


----- Original Message ----- 
From: "Kenneth G. Gordon" Subject: [ARC5] 10 meter BC-454 a bit more


> With the 12SG7 installed in the RF amp, I can still hear a 0.1 microvolt 
> signal in CW,
> although it is right at the noise level, even through the loudspeaker.
>
> With headphones, a 0.5 microvolt signal would be fully copyable in CW.
>
> With the 12SK7 installed, I need 0.5 microvolts to be able to hear it in 
> CW through the
> speaker. I need at least a full microvolt to copy the signal with 
> headphones. Obviously, the
> tube-generated noise is masking the signal.
>
> Ken W7EKB
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