Yes Alan.
I just compute the loop antenna using
the new EZNEC Pro V 6.0
As you predicted the front to side is
sharp and deep only at very low angles, that means for ground waves on day
light.
About the DK7FC night reports : his
location is at 45° azimuth outside my loop plane, and 390 km of distance means a
site wave of about 55/60° for an usual F1 + F2 layer at a night altitude of 350
km. In that case, the signal is only 0.8 dB lower than a signal coming at same
distance and in the plane of the loop.
For long distance, as 2° site angle
for 3500 km, the front to side is not 0.8 dB but 20 dB….
On the way, I just made very
accurates measurements on this transmitting loop antenna. In accordance with the
EZNEC, I found for 1 Watt TX, 6 milli watt EIRP. This is an average value for
20° to 80° site waves. With 6 mW EIRP, a night report of -16 dB at 390 km is
normal when the MF band is very quiet as last night.
Andy.
Sent: Tuesday, July 28, 2015 12:29 AM
Subject: Re: LF: F6CNI to night testing a tuned loop TX on
MF
I think there is quite a lot of high angle off the
side......the "null"is only at zero degrees elevation.??
Alan
G3NYK
----- Original Message -----
Sent: Monday, July 27, 2015 11:03
PM
Subject: Re: LF: F6CNI to night testing a
tuned loop TX on MF
Hello Andy,
How is this possible? Your Loop points to
SE, my loop also points to SE. But we are not in one line. Actually it would
be best for us if our loops would point to NE.
But i can receive you at -16
dB SNR in WSPR with 1 mW ERP ??
73, Stefan
