[ARC5] Selectivity ratings of ARC-5 receivers.

[Dennis Monticelli]

They may only be talking dB voltage, not dB power.  So 2X is 6dB and 1000X
is 60dB (vs 3dB and 30dB respectively in the power domain).   A 6 to 60dB
shape factor of 26/7.3 seems about right for that IF strip.

Dennis AE6C


On Mon, Oct 28, 2013 at 8:31 PM, Kenneth G. Gordon <kgordon2006 at frontier.com
> wrote:

> Reading the ARC-5 maintenance manual, I see that the selectivity for, say,
> the R-26 (3 - 6 MHz) receiver is listed at 7.3 Kc at 2X, and 26 Kc at
> 1000X.
>
> Now 1000X is 60 db, but isn't 2X 3db and not 6db?
>
> Color me confused at this point.
>
> My thinking is that in order to achieve a 3db increase in signal level at
> the
> receiver, the transmitter must be doubled in output power, given identical
> conditions.
>
> Or am I all wet here?
>
> Ken W7EKB
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