The original X-hat elements were solid rod 3/16" in diameter with a 1.25" long by 3/8" OD sleeve crimped over the center of he rod before drilling for the #8-32 x 1.75" mounting bolt. Newer antennas
Dick, When you inspected your rods, how "tight" was the sleeve - what was the wall thickness? If the center of the sleeve is too large, there will be no support in spite of the crimp. On the old ante
With two HAM-4/HAM-5/T2X controllers, remove the meter fuse from one unit (this is the "slave"). Connect the unmodified ("master") controller to the rotor as usual. Connect the "slave" in parallel w
The master needs to be powered up to read direction (for the meter to operate) on the slave. 73, ... Joe, W4TV _______________________________________________ _______________________________________
Having designed and built those trucks for a few years, there are two issues here: 1) mast height is accommodated by the many turns of the "nycoil" which stretches like a slinky as the mast is raise
Generally not. The feedline tends to be a high quality foam .405" cable for the 2 GHz band. The transmitter (2W) was in the rack below with power amplifier (ca. 10W) mounted at the top. The loss pro
The commercially available nycoils are on the order of 36 inches in diameter when not extended. If one assumes three turns with 8" diameter at maximum clockwise rotation and a clockwise coil, rotati
Beware! The colors are not all the same. Trace the circuit and never trust the colors. The circuit is not that complex and is relatively easy to trace since you're really looking at: two wires for th
Barry, The schematic for one antenna of the microHAM Double Six and Double Ten switches is shown right on the web page with both RF and control. Here is the principle of operation: <http://www.microh
Pete, Although it will "work," daisy chaining outlet strips (or extension cords) - including connecting extension cords to an outlet strip - is against code (NEC). The warning on your new strip is pr
Gene, Unless the Skyhawk is significantly discounted, it is much more expensive than the TH7DXX. Skyhawk lists for $1295 (www.bencher.com/ham) vs. $870 for the TH7DXX (http://www.hy-gain.com/Product.
The driven elements in the TH-7 are not in phase. There is a phase reversal (cross-over) in the middle of the tubes (feedline) that connects the driven elements. The dual driven element system on the
The information is in NCJ (National Contest Journal), November 2004, page 8. "Improved Stack Switching with Invisible Stubs" buy, N4TZ. Remember, this system in a monoband system and does not work wi
The information is in NCJ (National Contest Journal), November 2004, page 8. "Improved Stack Switching with Invisible Stubs" by N4TZ. Remember, the N4TZ system is for monoband antennas and does does
The information is in NCJ (National Contest Journal), November 2004, page 8. "Improved Stack Switching with Invisible Stubs" by N4TZ. Has information on two, three and four antenna stacks. __________
Billy, Dean Straw recommended the SRTM (Space Shuttle Topography Mission) 90 meter data. He has a draft of the HFTA operating directions that reference an updated microDEM that will work with the SRT
This is one of the reasons the TV news vans don't use masts bigger than 52/56' on a Ford F-350 or Mercedes van chassis and generally include "stabilizing jacks" at the rear corners for the big masts
Straighten the "radials" into a single wire and the AV-620/640, or R5/R7/R8 certainly resemble an off center fed antenna - what it often called a "Windom." No, the high impedance is because of the o
Dan, Amateurs have been calling off-center fed dipoles a "Windom" for more than 40 years. The oldest ARRL Antenna Book I have owned includes that same discussion. Whether you insist on calling only t
1) If this list hadn't take the backward step of making the only way one can reply to a message "reply to list," the private and non-English postings would not have to go to the entire list. 2) it is