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On the left is an M-2 6M8GJ with an old HDR-300 AZ rotator. The little white box is a Solar Powered, wireless, Wind speed and direction sensor which sends data back to the shack.

 

On the right is my small EME array for 2m and 70cm. The antennas are InnovAntennas G0KSC LFA's. There are currently 4 18 element 432 LFA's on the left of the H-Frame and 2 15 element LFA's on the right. Justin, G0KSC designed both the antennas as well as the H-Frame for the two bands. Thus, there are two 'Splitter Bars" which you might see in the picture. They are located attached to the horizontal H-Frame bar and mounted between the vertical mast and the respective vertical H-Frame leg. The splitter-bars allow mounting the phasing harness coax as close to the LFA feed-point as possible. This obviously reduces phasing harness feedline losses. The EME pre-amps mount on the splitter bars, at the splitter for each band. Thus they too are closer to the actual driven elements than found in other methods of feeding the yagis.

The AZ/EL rotator is a Polish SPID-RAS 1.0 degree accuracy. Sometimes you see them called AlphaSPID. The control box for them to work with the computer is their "Rot 2 Prog". The tower on the right side of the picture is a Glen Martin 40 foot "Hazer", (A tram-like cage carries all of the antennas up and down the tower with an easy geared winch-crank. So I needed a Az/EL rotator which would be able to fit between the edge of the tower while still allowing the "Mast" to ride in the center of the "Hazer". The SPID-RAS fits the bill. I have lowered this assembly in high winds with no trouble. The tower has three guy-wires which I unclip, at ground level, when I am going to "possibly" need "Elevation" greater than some high number. I just walk the circle around the tower and reach over and let the end of the guy wire drop from my hand to the ground. Might take 3 minutes to grasp and drop. I have had them dropped, so far, for 38 MPH gusts and there were no structural problems. The tower is an 18 inch base version.

Rig: K3 from Elecraft with 3 transverters: XV50, XV144, XV432 ; Xref board which allows my Trimble GPS to keep the K3 on a nearly exact frequency; TCXO's and matched 8-pole filters in all.


The view is similar to the one shown from circa 060 degrees around to 280 degrees and in the Southerly direction. This is what rural Appalachia looks like to us. There are no dwellings seen, or hidden in valleys, in this picture. Behind this picture is a 300 foot long dipole which is 80 feet off the ground and stretched between some oak trees. Cinder-Blocks are on a line which goes from each end of the actual antenna and through a pulley up in the trees and towards the ground. In high winds I have seen the center feed of the long dipole raise up and down about 30 feet due to the random swaying of the tree tops.

 

 

Here's how I work on any of the cables; adjust VSWR on the LFA driven element loops, and so forth: Crank down the Hazer-tram, do work, use the double-geared hand winch and raise the Hazer-Tram to the top again. If I go back in the shack and decode I didn't like the previous changes, I can have it back on the lowest point in about 5 minutes. The tarp coves dirt removed from the tower base the test cables will be removed and the regukar stuff buried below the ground.

 

This was the view of the 450-ohm feed line as it arrives at the 300 foot dipole. We had just had a pretty strong amount of ice form on trees. The height is about 80 feet off the ground.


 

My idea of "Mobile Operations" and how I would rather get around. This is one of my wild mustangs, Shaanav. My son is following.

238804 Last modified: 2013-03-11 15:52:36, 4348 bytes

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