I wanted to thank everyone who has chipped in with helpful suggestions
and advice with the modeling of this 630m short inv-v antenna. I have
finished the modeling aspects, built up the prototype, installed it,
trimmed it, and have been QRV for 2 nights now. What is amazing to me is
that a pair of 146 uH inductors are needed to resonate the antenna and
that after building them up over a 3' length of 4" PVC pipe the antenna
was only 50 kHz off frequency when initially tested. EZNEC was amazingly
accurate in my opinion.
In the end all I had to do is trim the antenna length twice to bring it
to resonance right where I needed it to be. The antenna has a 2:1 BW of
very close to 7-8 kHz which is what modeling suggests.
On the air reports have been very exciting to gather, esp for an antenna
that should not be used by conventional wisdom (and opinions) for this
frequency. Running about 20W in the shack, through 300' of RG8-X coax,
my estimated EIRP of about 1/2W has been enough to make QSO's all over
the country.
Here is a snap shot of the stations who copied my WSPR transmissions
last night. I have also decoded transmissions from VK land on night one
of testing.
https://www.dropbox.com/s/daguxwn4e1a57vr/W8BYA-WSPR-2.jpg?dl=0
Gedas, W8BYA
Gallery at http://w8bya.com
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
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