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

BION- I have a 1994 Ford factory service manual which says they
intentionally made the speedometers read a little high, apparently to
encourage drivers not to speed. When the speedometer reads '65', the car
is going about '62'. However it also makes the gas mileage look better
too because the odometer shows more miles driven for the amount of gas
used. I suspect that's the real reason they did it.
I confirmed the speedometer error by installing the next larger size
tires than the OEM ones. It made my speedometer very accurate, less than
1/10-mile error in 40-miles, compared to about 1/2-mile with the factory
tires. I measured the mileage on an Interstate highway which had newly
installed mileage markers.


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