A properly designed reflector will give the user the CHOICE of "Reply to sender" and "Reply to All" or "Reply to List." This software is so crippled by the moderator's configuration that it is nearly
The ARRL Antenna book is wrong in that regard. The whole design of the original antenna that Loren Windom reported on was to solve the RF in the shack issue by matching the impedance of the single wi
Mike, I moderated several fairly busy groups for a few years - I've walked more than a few miles in those moccasins. Although English may be the current global language it is no excuse to treat those
Jim, It's been 30+ years since I last read the original work but the test plan involved current metering on either side of the attachment point. The thesis was that when the currents on either side o
I don't see them on the RadioWorks web site. Do you have a link? 73, ... Joe, W4TV _______________________________________________ _______________________________________________ TowerTalk mailing l
Todd, Your conclusions are accurate for small yagis - two meters and above - where the boom represents a larger surface area than the elements. However, with HF yagis the elements generally represent
I'm also concerned with equipment/software that would display SWR of less than 1:1. Either the equipment/software designer does not understand SWR (in which case I would not trust the results shown b
AIM 2170 - for example: http://www.balundesigns.com/catalog/1-1%205kw%20Scan.jpg Note the SWR scale on the left vertical axis ... all the way down to 0:1. 73, ... Joe, W4TV On 5/22/2010 9:49 AM, Ian
No, I do not have one ... I am critical of an incorrect display as shown in that data. As I said, either the designer does not understand enough to produce a product that displays (operates) correct
Correct if one is interested in keeping the omnidirectional noise from coupling to the antenna. There may be ... if the omnidirectional noise can couple to the antenna in one direction, it should al
Be careful with the bifilar parallel wire chokes. The Zo of the "transmission line" in the choke is higher than 50 Ohms (generally in the 70 Ohm range). If the length of the transmission line is mor
Instead of mounting the toriod stack flat in a 4x4x2 box, why not mount it "on end" in a deeper (e.g. 4x4x4 or 4x4x6) box? It might take a little creativity to build a mounting baffle but standing t
If the braid is bonded to the top of the tower (it should be bonded both top and bottom for lightning protection), one particularly needs and effective balun. Without it, current in the "shield" sid
The DX Engineering switch is a single radio switch. The microHAM switch being referenced is a dual radio switch. Port to port isolation in single radio switches will depend on whether unused ports ar
For monoband stacks I like the N4TZ "Invisible Stub" design from NCJ a few years back. You will need to add an extra box/relay with half-wave coax for the out of phase condition. The N4TZ design avoi
Jamie, Depends on your conditions. If you're on the beach one of the 20' fiberglass poles with three vertical wires may be as easy as anything. If you're away from the beach and have a good high supp
This is theoretically possible if the connectors are installed in such a way as to separate the shields. If the connectors are installed UNDER the inner shield, LMR cables should be no different than
Jim, In theory it would depend on the thickness of the inner shield vs. frequency (skin depth) and whether the inner shield was insulated (aluminum oxide is an insulator) and the electrical length be
Their supply is either 120/208 (e.g. wye or star) with neutral being the center of the wye or they need to install their own 480 to 240/120 transformer on premesis. 73, ... Joe, W4TV _______________
I'd like to have 3-phase power for any linear DC supply. The higher ripple frequency and tighter regulation are significant advantages while the distribution is no more difficult than traditional 12