Steve, Over the last week, I've been collecting articles and data on various S11 versus S21 methodologies for use with RF choke CM measurements. In your S21 measurements, are you still using a resist
For me, the answer is in understanding the measurement limitations in order to determine what's "good enough." Without understanding the limitation, then we are in a guessing game with ourselves. I
Owners of the VNA2180 vector network analyzer may have an interest in a simple CM test jig I created using DipTrace PCB software. I recently ordered a set of boards from Bay Circuits and if it works
Jim, RG-400 is excellent and easy to use with both crimped and solder connectors. I use it exclusively for all inside RF cabling. New and surplus-spool prices have been driven up during the last two
various lengths of jumpers using RG400 with Amphenol 83-1SP UHF male connectors..." Tim, Since RG-400 requires a UG reducer with a male PL-259 UHF connector, DXE may want to consider this ultra-supe
Unless there's been a recent design change, Balun Designs (BD) doesn't seal in and around the stainless hardware. The gasketed cover seals are not the issue. I've experienced water leakage getting in
The VNA2180 CM Test Jig boards arrived. Qty. 5 available, I am supplying these FREE to VNA 2180 owners while the supply lasts. There will not be another production run. CONUS shipping via USPS Priori
I agree with N1BUG. I recently placed two separate Arrow orders. In December, I ordered two Fair-Rite #31 0431177081 "Big Clamp" ferrites. Small quantity price is $8.27 ea. Mouser and Newark is $17.1
P.S. It appears Arrow's current pricing on the big clamps is $15.62, still less expensive than others. They must have had a deep-discounted sale back in December. Paul, W9AC I agree with N1BUG. I rec
When over-resonating with a long T-top on 160m, the maximum current point moves away from the ground and up toward the center of the vertical radiator -- another benefit. Unless there's a deliberate
That's right. Radiation resistance closely follows vertical length although the base resistance component changes with vertical length and T-top size. I took the lazy approach and purchased a bag of
Ufer ground. I guess they had done some reading about tower Ufer grounds. I had already planned one -- three 50' runs of 1/0 tied to the rebar cage and bottom section (pier pin), exothermically weld
And, assuming the tower is fully assembled on the ground and a crane (or two) is rented, that's another large amount in addition to the base mat or pad & pier base. Two cranes with 190 ft. extension
For those wanting to crimp connectors on RG400, I've been using these two types from RF Industries: PL-259: RFU-505-C1 Male N: RFN-1005-3C1 For soldering RG400 with a male PL-259, a UG reducer is nee
indeed, he does make a new and improved version of the oem F12 5BA When someone has the JK model number, please pass along the info. I don't see it listed on their website. Like the Optibeam OB16-5,
mast with rotator, bonded to the tower, with the topmost antenna down, say, 5ft from the mast top so the mast forms a sorta lightning rod" I think that's mostly a "feel good" exercise. Focus on the
It comes in sticks about 18" long and 1/8" wide; the alloy is 15% silver, lead free. You need something hotter than an ordinary propane torch; I use MAPP gas, which works just like a propane torch."
foot or foot and a half tall? In a little caddy which you can carry around? Yes, that's the one. The Lincoln Electric kit came with a standard torch and a cutting torch. I've only used the standard
dropped to 1:1 in the middle of the 80 meter band. The SWR decreased on 40 through 10 as well so I can now use my limited range auto-tuner on all bands. The short 110 foot dipole doesn't seem to be
In the '70s, I repacked my CDE rotators every few years using common axle grease. I'm not sure there was a better quality of grease available for the DIY crowd although much more expense industrial