Topband: 50 ohm direct burial coax cable

[Jim Brown]

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