At a former QTH where we lived in the Calif. Santa Cruz Mountains, above San Jose, our soil was analyzed -- both "silty sandstone and sandy siltstone"!!? One appeared more brown, other a bit more yel
Yes, and they were all negative! If you can find a used, but still good R7, seems to have been much better. The R7000 almost certainly will not take full power on any band in RTTY service. If you re
Aloha Roy, You wondered: Call HRO, Ham Radio Outlet. Stores all over the mainland. I called them last Winter, fournd they had the smaller F12's in stock. I had a C4 out here in Hawaii three days afte
Aloha Ian, you wrote, in part: from My C4 is about 60 feet above the ground. Here are my measurements of vswr, here in the shack at the end of my two coax runs: 40 Meter Dipole element: 7000......1.2
Bob wrote, in part: They are not dummy loads; however, electric field lines from the high RF voltage near and at the end of the dipole, very close to the ground mounting point, do couple to the groun
Of course! When raised, the Q of the antenna system went up as the ground loading resistance decreased, particularly on the low bands where the E field ground penetration depth is quite high. I pres
Why low power only, or is the Gap not able to withstand higher voltages, say up to 800 volts or so? From what has been written about the Gap, it sounds as if it uses some sort of "linear loading" wi
Well, flexing is not why my 7 year old cable broke: it was rust -- all the way through the cable strands!! And it was rust of the cable on the winch drum; a lot of a crank up tower's cable sits on t
It was asked: Nope, if feeding a single boom mounted array with a single feedline. Maybe, if feeding a stacked set. However, the pattern radiated from the stack is entirely established by the phase r
Here on the Island of Kauai they say that frost was once seen up at Koke'e, the state park on this island at about 4000 foot elevation above the sea. I heard thunder one day two years ago; and the y
My suggestion, Kirk. I had a Mosley TA-34 XL from the late Winter, 1992, until January 1999. It was on a US Tower MA-550 crank up, but spent most of that time at around 40 feet up. Operated OK. But I
My suggestion, Kirk. I had a Mosley TA-34 XL from the late Winter, 1992, until January 1999. It was on a US Tower MA-550 crank up, but spent most of that time at around 40 feet up. Operated OK. But I
Aloha, Interesting discussion occurred on yesterday's Hawaii Afternoon Net. For the most part, very few strikes of lightening occur on the HI islands. About Kauai, when large thunder storms come, whi
It was asked about LMR-600: from Go to the TM Attenuation and Power Handling site at: http://www.timesmicrowave.com/cgi-bin/calculate.5 Select the LMR cable of interest, and the frequency. You find,
Aloha, Mike, AH7R, has just completed some very nice EZnec models of vertical and low dipole comparisons. He was most interested in applications for portable use; easy to carry on plane components, e
Hans wondered: Well, I threw a rope up over the boom of my beam with the 550 cranked down. Was able to get the rope very near the center of the boom at the top of the 550. Pulled about 8 feet of rope
Because what controls the far field apparent "take off" angle is the height of the antenna above ground, and the ground conductivity out in the so called "fresnel zone". And this only works when the
Brian wondered: In case you missed this info earlier: To quote Tom, W8JI, given choke impedance of: "1150 ohms. That would be plenty of impedance for 80 meters on up, and OK even on 160." So, maybe 6
John asked: So what happens to your operation once the bead balun gets hot and experiences the "big bang" ? Does your vswr go up? Does the antenna efficiency become lousy? Maybe the driven element is
KH7M wondered: Greg replied: Then I am ok with my two Force 12 antennas and the F12 bead B-1 baluns. I have the C4 with separate lines and baluns on the boom: one for the EF140S 40 meter dipole, the