It's a mistake to lump all ladder and window line together as "ladder
line" and draw conclusions about its loss characteristics. There's a
vast difference between punched polyethylene window line and real 600
ohm ladder line made with large diameter conductors and low loss
spacers. Even more so when the line is wet.

Roy Lewallen, W7EL

Roy Lewallen wrote in news:mLadnZ7-05DkY6
:

It's a mistake to lump all ladder and window line together as "ladder
line" and draw conclusions about its loss characteristics. There's a
vast difference between punched polyethylene window line and real 600
ohm ladder line made with large diameter conductors and low loss
spacers. Even more so when the line is wet.

Yes Roy.

I was talking about the commercial "ladder line", and used the example of
Wireman 551 which is of the punched polyethylene window line type you
mention.

The other comparison I made was the ARRL "Generic ladder line" whatever
that means with ideal copper conductors of same dimensions in a vacuum. I
cannot see how adding insulation can possibly halve its dB loss, can you?

Owen