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KC3LMV

Joined: Sun, Sep 9th 2018, 15:46 Roles: N/A Moderates: N/A

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2 meter slot-cube antenna KC5EZC on 31/3/19
I have built the 2M Slot Cube with the revised pipe lengths. I made it in 3 assemblies. The top loop, the bottom loop and the feed point loop. I did all my work on a capped block wall as it is relatively flat. Then after the assemblies were relative parallel and square I combined them together. I had to do a bit of fussing and adjusting with the finished assembly to get everything relative parallel. I have only tested the antenna attached to a 1.5 " x 4' piece of PVC on top of a 6' ladder. The antenna was cocked downward about 30 deg. It worked marvelously. I hit a 2 repeaters 18 miles away on 20 watts. As far as I can tell from my MFJ SWR meter the SWR is quite good maybe as high as 1.5 : 1 on 50 watts. Ill be doing more testing with it the end of April when I meet up with a friend with a High end Analyzer
2 meter slot-cube antenna KC5EZC on 31/3/19
I was able to find the information on Scaling antennas from and article by W5ALT " Antenna Notes For A Dummy" From that artical and with some math help from my Niece Amy Sefcheck I came up with the following.

NOTE I have NOT built or tested it yet

6 Meter Slot Cube Calculation
WL = Wave Length, Freq Old = 146.5 MZH Freq New= 52 MHZ
WL old =984/ Freq old = 984/146.5mhz = 6.7167
WL new =984/Freq new = 984/52mhz = 18.9230
SF =WL new/WLold = 18.9230/6.7161 = 2.8173
If we round the SF to 2.75 what is the corresponding Freq New
984 / (WL old * New SF) = New SF freq
984/ ( 6.7167 * 2.75) = 53.2729
2 Meter 6 Meter Amount of ½ “ pipe
8.5 * 2.75 = 23.375 23.375 * 6 = 140.25 L in
8 * 2.75 = 22 22 * 2 = 44 Lin
6 * 2.75 = 16.5 16.5 *2 = 33 Lin
4.25 * 2.75 = 11.6875 11.6875 * 2 = 23.375 Lin
1 * 2.75 = 2.75 2.75 * 2 = 5.5 Lin
Total 246.5 Lin = 20.55 LF = 2 and a fraction of 10’ pipes

2 meter slot-cube antenna KC5EZC on 14/3/19
Can this Slot-Cube antenna for 2M be scaled up to a 6M antenna. Is there a conversion factor to go to 6m?

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