Discussion in 'Antennas, Feedlines, Towers & Rotors' started by RW4HFN, Oct 11, 2020.
Hello! Welcome to my page on QRZ.RU!
Ready to answer for any question about my antennas.
Thank you for posting the link Igor. I see some interesting things in there - one that looks like a variation of a "fan vertical", and one that looks like an asymmetrical off center fed bowtie antenna for HF!
Google translate struggles hilariously with some of the Russian - I doubt that any of your antennas have "hemorrhoids" for example
Is this one (the Pyridon?) basically a fan vertical with a set of radials with loading coils? Interesting
Apologies - my mistake - this is the Pyramidon
I have definitely not seen this before! (For viewers: here is the link )
Correct! "Piramidon"! Related - "Pyranha" \ "Pyramix". Here.
The first one is "AsDip" - most repeatable of my antennas. Simplest multiband vertical... IMHO
And the AsDip looks like it is what we would refer to as an elevated "fan vertical", with three resonant vertical elements, but this antenna has a single tuned radial for every band, maybe with loading coils in the radials to shorten them? And we attach a choke (also called a "current balun") between the vertical and the coax to mainly stop common mode currents. Is this about right?
Absolutely. The coil shorts radial and adjusts it in the first approximation. Fine adjustment - by telescopic radial .
We use simple cable choke about 1000 Ohm \ lowest working frequency. For example its 6-7 m of cable for 40m. Routine or exotic. )
Interesting. Do you find that shortening the radials using a loading coil decreases the bandwidth of the antenna, for example as measured by the distance in frequency between 2:1 SWR points?
Also on the Pyramidon, it is difficult to see exactly how the feedpoint works, as there are 4 wires going into that red circle. Can you give us some more info on the feedpoint connection please? Maybe a “zoomed in” view so we can see what connections are made?
Of course, decreases... But bandwidth of "standart" AsDip enough
for HAMs (350 kHz \ SWR=2 on 20m). "Special" AsDip 2-3 times wider.