[Lowfer] 2200m dynamic load

[N1BUG]

Brian,

I have not seen that here. My resistance remains the same regardless
of power from milliwatts to 200 watts. With luck perhaps I will see
about higher power soon.

What I do see is that my loss resistance increases dramatically when
I have wet snow or ice. I believe this is due to nearby trees being
coated with the stuff.

Consider yourself lucky with the 40 ohms. You should try this with
northern New England soil! My ground loss was twice that in th dead
of winter and is slowly rising with seasonal changes.

I hope to never be without my scope match! I don't run it
continuously because the scope is old and I'm trying to keep it
alive, but I leave it all connected and turn the scope on briefly to
check from time to time. It is a great aid in retuning "on the fly"
while transmitting (my variometer is motorized and controlled from
the transmitter room). There is no guesswork about which way to tune
and I can keep it precisely resonated.

73,
Paul N1BUG


On 04/01/2018 08:39 PM, Brian, WA1ZMS wrote:
> While trying to get a bigger PA set-up today on 2200m, I ran into
> a problem which is rather odd.  It would appear that my ground
> losses are a function of RF currents flowing.
> 
> Has anyone seen such an effect with rather lossy ground at LF?
> 
> That fact that the load Z shifts and thus detunes any PA driving
> it (I have tried two different PAs) makes for more chasing one's
> own tail when measuring Z both inside and out at the antenna.  My
> ground losses on 2200m are on the order of 40 ohms so that's part
> of my root problem!  Time to build a 2200m Scope match I
> suspect.
> 
> Comments?
> 
> -Brian, WA1ZMS iPhone