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jimvw57

Joined: Sat, Dec 16th 2017, 15:23 Roles: N/A Moderates: N/A

Latest Posts

Topic Author Posted On
2 Meter Slot-Cube Antenna (QST Jan 2019) K1AWC 4 days, 7 hours ago
did some more playing around today and found that by moving the feed point to 4 inches back from the vertical l, I get resonance at 148 Mhz with SWR at 1.3. I attached wire directly to the horizontal tube without using the short stubs with the tee connectors

UPDATE
I took it outside and stuck it in a tree about 6 1/2 ft off the ground, reports from other stations say it is much better than my od J-Pole and lots less background noise, I noticed it also doesn't feedback into my computer speakers.
2 Meter Slot-Cube Antenna (QST Jan 2019) K1AWC 1 week, 1 day ago
I believe different brands of the copper connectors are not all the same length.

kmikemoo did that change the gap between the vertical tubes?
2 Meter Slot-Cube Antenna (QST Jan 2019) K1AWC 2 weeks, 4 days ago
UPDATE

I took this guy to the local club meeting, we were also participating in the Minnesota QSO party, and talked to some extremely knowledgeable hams. I learned a lot! I found that the construction i did was not as square as it needed to be and after a bit of tweaking, I am able to get SWR to 1.1 at 139Khz, and at 1.6 at 149Khz which is pretty darn good! Next will be mounting the antenna to stabilize dimensions and getting it above the ground. Right now it is sitting on a wooden desk with a bunch of tools and equipment nearby.
2 Meter Slot-Cube Antenna (QST Jan 2019) K1AWC 3 weeks, 2 days ago
I extended the antenna (all corners) by sliding the tube so it only is about 1/2 way into the corner elbows, and I got resonance at 137 MHZ with 1.4 SWR
2 Meter Slot-Cube Antenna (QST Jan 2019) K1AWC on 22/1/19
This was driving me crazy so I did a little playing and found that by rotating the orientation of the cube, It would affect the readings..I then found the coax connection ground was touching one of the vertical uprights depending on how it was sitting on the bench. A little electrical tape (temporarily) and now it is reading 1.2 at 139.02 if I lay it on one side, flipping it 180, I get a 1.2 at 141.74..I think I need to take this outside away from everything and check it again. Of course it is only 10 degrees outside right now...

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