[Elecraft] [OT] Loss in window line [OPINION] [LONG]

[Ed Cole]

Good discussion as I was thinking to use window line in my new 630m - 
40m antenna.

Maybe revert to running parallel lines spaced 1-foot with spreaders only 
at top and bottom of 40-foot vertical run.

I did that with my previous inverted-L with no weather related issues. 
Impedance did shift between summer (unfrozen soil) and winter (frozen) 
which was easily compensated by a change in loading coil tap.

Radials were lying on ground vs in-ground or suspended above ground. 
New radial field will be planted in the soil a couple inches (so I can 
mow the lawn without rolling up the radials each time).

73, Ed - KL7UW
recent "fun" getting FL-digi to work with my K3.

Date: Fri, 14 Jan 2022 13:21:50 -0800
From: Fred Jensen <k6dgwnv at gmail.com>
To: Bob McGraw <rmcgraw at benlomand.net>
Cc: elecraft at mailman.qth.net
Subject: Re: [Elecraft] Elecraft Digest, Vol 213, Issue 6
Message-ID: <09a385cb-07b4-29f8-0c64-464705bdae2d at gmail.com>
Content-Type: text/plain; charset=utf-8; format=flowed

My experience as well.? No real change in loss but the complex impedance
at the TX end does change enough to require a re-tune.? It used to be so
much simpler when the tank circuit on the PA served as both a matching
network and harmonic filter. ?

73,

Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County