Discussion in 'Amateur Radio Equipment Reviews' started by PU1VZP, Oct 18, 2019.
Wow. Looks great.
A log-periodic antenna is a good choice IF it covers the bands you want to use, AND if you can have only one antenna. It's basically a 2 or 3 element beam for multiple bands. Unless it's REALLY big, most of them only cover above 30 meters to maybe 10 meters.
You don't even need a tuner so you're not wasting power there
Most all l will give you about 6 DB of gain,
Front to back is not as good as other beams however sometimes that works to your advantage.
And did I say low SWR, 1 feed line, that's why the military and the government use them.
That one is pretty lightweight also compared to a big Beam with a ton of traps.
I'm honestly surprised more amateurs don't use logs.
I have a big Collins log which has a 48 foot Boom at 90 foot on my remote station in Belize, V31KW. It works from 6 mhz and up has survived numerous hurricanes over the years.
TAKE A LOOK AT THE QRZ PAGE OF W1EBM.
HE HEARS DX AT 5NN - - WHERE I AM JUST ABOUT ABLE TO HEAR THE DX .
IF YOU HAVE MONEY GO FOR THE GUSTO LIKE W1EBM.
This was was at the KS station
It is a M2 skiplog with 40 meters
I currently have one at 195 feet
Yep, closer to "not quite a 2 element", and not likely to have a low enough vswr that you won't want a transmitter without an adjustable output impedance.
We had 3 rotatable log periodics at about 100 feet at the navy hf relay site on Diego Garcia.
The 4 element 20m monobander at 40 feet at VQ9AA beat it by a s unit.
Every. Single. Time.
My personal create systems 50-1300 log periodic at ai3v Pittsburgh was a very mediocre antenna. Both in gain and vswr.
But that 4 element 20 meter beam only worked on 20 M, the log works on a wide frequency range, that is an advantage of some people.
That all well and good, but let's be honest about the serious tradeoffs needed to get that "wide frequency range"
Another way to say "not quite a 2 element " is hardly better than a dipole.
Single band log's have a nice back lob that is very easy to control with downtilt. Bandwidth is nice. Very good antenna at VHF and above. Very very good antenna for wide band commercial HF use. AT&T used 100's of them in the 50's and 60's.