>
> I found similar effects are regular and reproducable on VHF.
> 2 or 3 time the week I schedule with a friend about 350km from
> my qth on 144Mc.
> When we start signal strength is around S9.
> After about 20 minutes signals are up to 9+20 and stay that high.
> ERP on both sites is around 120KW.
>
> More then 30 years I serviced a forward scatter station near cologne
> running at 70Mc.
> ERP was enormous with the 45m dish and a klystron amp, but the 800km path
> was
> reliable with 99,99% ( 0,1% due to service ) to Verona, Italy.
> Information transmitted were 120 RTTY channels.
>
> On HF so far I did notice similar effects only on backscatter, but might
be
> worth to run some tests with overseas stations point to point.
>
> 73 de Peter, DF3KV
Very interesting Peter,
I wonder if more work was done to see how selective in frequency the effect
is? Would it be just on that particular frequency, or more broadband (so
others can take "free" ride)?
Was there any threshold to the power used, or was it fairly "linear" - amount
of "conditioning" proportional to the ERP used?
Was there indication (tied to propagation, sunspot cycle) if overall
conditions, absorption had significant effect on the quality of propagation.
Vielen dank Peter, 73!
Yuri, K3BU, VE3BMV
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