RadioBanter - View Single Post - Length of Coax Affecting Incident Power to Meter?

August 12th 03, 10:06 PM

(Tom Bruhns) wrote in message om...
(Dr. Slick) wrote in message . com...

But can you make a 50 Ohm dummy load with those specs that can
handle
300 Watts? The stays at 50 Ohms out to at least 200 Megs or so?

50 +/- what? What return loss are you shooting for in this 300W dummy
load? Do you really need 40dB, or is 30dB good enough? I believe
it's possible to bootstrap yourself into measurements that are far
more accurate than you'll need for what you are doing, and do it quite
economically if you don't count your time. But you ought to first ask
yourself just what accuracy you really need, and understand why.

+/- 5 ohms or so. Something that doesn't swing up to 65-70 ohms or
40 ohms.

And i'm still not sure what you mean by "calibrate your SWR meter
to the line". All the SWR meters i have seen are all for 50 Ohms.

Could you tell us the exact procedure?

Of course not; I know nothing about YOUR SWR meter. If you understand
how yours works, you should be able to see how to adjust it, though it
may not be worthwhile.

I didn't think you could tell us. I've never seen an SWR meter
that you could "calibrate" to 50 or 75 ohms, or less.

Slick