VK7HH > 21-03-2018, 09:37 PM
VK2KRR > 22-03-2018, 06:04 AM
VK4ADC > 22-03-2018, 07:28 AM
VK7HH > 22-03-2018, 08:01 AM
(22-03-2018, 06:04 AM)VK2KRR Wrote: How about a magnetic loop
http://www.wimo.com/magnetic-loop-antennas_e.html
(22-03-2018, 07:28 AM)VK4ADC Wrote: http://www.vk4adc.com/web/index.php/hf-p...d-v-dipole
with maybe a couple of extra traps at 7.0MHz to make the inside segment tune to 20 metres.
Don't forget 30 metres either if you are interested in HF digital.. by adding yet another pair of traps at 10.1MHz.
The dipole antenna arrangement I took for my VK9NU outing 2 years ago comprised enough traps such that it covered 6, 10, 12, 15, 17, 20, 30, 40 and 80m in two separate legs off each side of the common balun. The WARC bands were on one wire leg, the standard bands on the second wire leg, the whole thing mirrored. The individual bands were tuned by adjustable droopy tails, with the separation between each trap fixed distances.
Don't forget that the legs of the dipole or V can be other than straight...
There are a few other trapped antenna articles on my web site, plus one about tuning and making traps, if you do a search on it. http://www.vk4adc.com
VK2KRR > 22-03-2018, 04:01 PM
VK4AQJ > 23-03-2018, 09:40 AM
VK2WP > 23-03-2018, 02:09 PM
VK4WDM > 23-03-2018, 05:22 PM
(23-03-2018, 02:09 PM)VK2WP Wrote: In my restricted area yard about 15 mtrs across by 12 mtrs set up a horizontal loop for 40 metres. The loop consists of 41.84 mtrs of wire suspended from poles at each corner of the yard.I was going to mention the horizontal loop. I used one in a previous QTH and found it would work on all bands 80-10m with a tuner and and if I joined both sides of the feed line together it would load on 160m like a Marconi T, albeit with rather poor efficiency. I worked into the Americas and Sth Africa on 80m using JT65 and plenty of DX on the other bands. Unfortunately I don't have the room to erect it here and have opted for a vertical, which was going to be my next comment.
The poles raise the loop about 7 metres high. The loop is fed by 450 ohm ladder line with a 1:1 balun.
A short length of RG213 about 500mm comes in through an opening from the balun to an aerial tuner. Its important to keep this length of coax as short as possible.
The loop will tune 80M, 40M, 30M and 20M, have not really tried any higher bands as have a hex beam for those.
Get very good performance for local VK and plenty of dx on 30M and 40M, not really tried the loop on 20 or 80M for dx as yet.
One great attribute of the loop in a suburban location is it is very quiet as compared to a dipole or a vertical.
VK2WP > 23-03-2018, 07:02 PM