On 8/9/2015 4:24 PM, Wayne wrote:


"John S" wrote in message ...

On 8/9/2015 12:23 PM, Wayne wrote:
I was looking at a MFJ remote antenna tuner, and it is specified as
being able to match 12 to 1600 ohms.

What does that mean? At 12 ohms the SWR would be about 4.2:1 and at
1600 ohms a SWR of about 32:1.

I don't know what to do with a 12 to 1600 ohm spec.



If one started from 1600 ohms around a Smith chart, the circle would
intersect at the other side at about 0.64 ohms.

Likewise starting at 12 ohms and going halfway around the chart would
end up at 210 ohms, not 1600.

I was just showing that the 12 and 1600 are not on the same circle.

Now I think I understand your point. I had not considered that you are
thinking in terms of the matching capability using SWR circles on the
chart. Very interesting and quite useful if the specs can be assumed to
mean that.

I have a gut feeling that the 1600 is a bit far out and that the 12 is
more realistic, but I have never used a tuner. My stuff was always
one-band designed so just fixed matching values suited.

If I learn anything I get back to you. Sorry I couldn't help.