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K9ZUT

Joined: Thu, Dec 31st 2015, 19:32 Roles: N/A Moderates: N/A

Latest Topics

Topic Created Posts Views Last Activity
Vertical Antenna Feed Jul 16th 2016, 22:34 1 426 on 16/7/16
DX Jul 7th 2016, 08:38 1 413 on 7/7/16
6 Meter Full Wave Horizontal Loop Antenna Jul 6th 2016, 23:55 2 416 on 9/7/16
(Stealth) Downspout Antenna Fed with 450 Ohm Ladder Line and a MFJ 901b Antenna Tuner Jul 6th 2016, 00:25 1 322 on 6/7/16
(Stealth) Downspout Antenna Fed with 450 Ohm Ladder Line and a MFJ 901b Antenna Tuner Jul 5th 2016, 23:58 1 370 on 5/7/16
Feeding a Vertical Antenna With Ladder Line Jul 3rd 2016, 22:30 1 428 on 3/7/16

Latest Posts

Topic Author Posted On
Vertical Antenna Feed K9ZUT on 16/7/16
I recommend feeding all vertical antennas with 450 Ohm ladder line because it eliminates the need for radials. I am currently using a MFJ-901B antenna tuner and MFJ-931 artificial ground. Radiation angle Is very low evidenced by DX worked.
John Brocker, K9ZUT
6 Meter Full Wave Horizontal Loop Antenna K9ZUT on 9/7/16
The loop was about 2' from the bed spring which affected the feed point impedance.
DX K9ZUT on 7/7/16
Worked PJ2/W3HNK on 20 Meters last night! His QTH is Isle of Carousal in the UK. (Stealth downspout bottom fed with 450 Ohm ladder line) continues to out perform with a low angle of radiation.
The downspout is 36' in height and the tuner is a MFJ-901b; the ground is a MFJ-931 artificial ground with a long and short counterpoise rolled up in the corner.
The radio is a Yaesu FT 950 running 100W. Signal reports were "contest 59's".
6 Meter Full Wave Horizontal Loop Antenna K9ZUT on 6/7/16
The Z is supposed to be 100 Ohms; with a 1/4 wave 72 Ohm matching transformer, 50 Ohms. But, VSWR is about 3:1 implying that Z is much higher or much lower.

Can anyone please explain what is actually happening?
(Stealth) Downspout Antenna Fed with 450 Ohm Ladder Line and a MFJ 901b Antenna Tuner K9ZUT on 6/7/16
First contact was VE7SO on 20 meters, British Columbia with a "contest 5X9" He was 5X5. Also worked a W2 in New Hamoshire on 40 meters. Believe radiation angle to be very low. John Brocker, K9ZUT

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