Now THERE'S an interesting rule of thumb I hadn't picked up on in the last 40
years. Thanks, Tom.

Jim


(Tom Bruhns)
shared these priceless pearls of wisdom:

-Also worth remembering: for well-made coax operating at HF, and
-generally well up into VHF/UHF, the attenuation in dB of a given
-length goes up as the square root of frequency, so at 450MHz, it will
-be (very close to) ten times the dB it is at 4.5MHz. That's because
-the loss is almost all in the resistance of the conductors, which
-(usually) varies as the square root of freq., because of the skin
-effect, in this freq range. (At high enough freqs, dielectric loss
-kicks in, and at low enough, the skin depth is greater than the
-conductor thickness.)
Jim Weir, VP Eng. RST Eng. WX6RST
A&P, CFI, and other good alphabet soup