m II wrote:

Dave Holford wrote:

WWV on 15MHz is currently S5, S7, S2 and S9 on four receivers here.
CHU on 3330kHz is currently S9+10dB, S1, S7, S4 on the same four
receivers.
All receivers are similar performance in terms of sensitivy and
bandwidth, but the HF antennas are all different.

So as a measure of signal strength, antenna and receiver performance S
units are largely irellevant. They are only useful as a measure of
relative strength of different signals on a specific antenna/receiver
combination.

We're lucky speedometers aren't designed with the same philosophy.

mike


There was an intriguing short story written some years ago whose premise
was precisely that. Wish I could remember the title

Dave