On 6/13/2014 12:17 PM, Donald Chester wrote:
I think you're being overly picky. The 75-ohm cable would be at worst a 1.5:1
mismatch. Probably a fraction of a dB loss at most, particularly with foam type
hard line. If you have a source of good, low-loss 75-ohm coax that will safely
handle the power you intend to run, and which will hold up for an extended
period under direct burial, use it.
Yes. Assuming a suitable matching network at the transmitter, worst case
excess loss due to a 1.5:1 mismatch is 0.18 dB, no matter how long the
line. Curves showing this have been in every edition of the ARRL
Handbook since I've been a ham (59 years).
73, Jim K9YC
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