Sorry to semi-hijack this thread
- but I just have to share this.
I put the Imax back up this morning in a hurry because I was having breakfast with a friend, so I haven't yet measured the exact lengths of mast & guy wire.
OK, with one 23 foot guy wire attached to the top Imax U-bolt, and about 8 feet of mast down to 3 @ 9 foot guy wires going to insulators, a total of about 34 feet of Rohn telescoping mast atop an 11 foot high, grounded galvanized vent pipe, with ~89 feet of RG-213...
- The Imax with 100 watts shows 2:1 at 23.150 & 29.550.
...or, 6.4 MHz wide at 2:1 swr. 
I'm using three meters, an Heathkit 2040, Drake W7 and the internal meter, all of which were within .1 of the others.
It's got to be something in the various lengths of guy wire and mast / coax length that's causing some sort of an active resonance tuning circuit, but I've never before seen anything this wide and I'd love it if someone else tried this same combination of variables then posted their findings, especially if they attained similar results.
How about <1.5:1 from 24.650 to 29.050MHz!!!
MHz ...... SWR
23.0 ...... 2.5:1
23.150 .. 2:1
23.5 ...... 1.75:1
24.0 ...... 1.7:1
24.5 ...... 1.6:1
25.0 ...... 1.3:1
25.5 ...... 1.25:1
26.0 ...... 1.5:1 (back up a bit)
26.5 ...... 1.4:1
27.0 ...... 1.2:1
27.5 ...... 1.2:1
28.0 ...... 1.3:1
28.5 ...... 1.35:1
29.0 ...... 1.45:1
29.550 .. 2:1
...and it seems to radiate the same signal strength from 23mHz to 29.5mHz in testing with a local buddy @ 10miles, iCOM ProIII, who followed me with his broadband vertical & tuner.
I only put it up to have something to use while I moved the Penetrator(or Saliut...?) to the 70' pine tree, but now with such a broad band spread I hate to touch it. :blink:
