4) The major issue with SWR at the transmitter is giving the transmitter a load that it is "happy" with. "Happy" means that it supplies full rated power, AND is CLEAN. Distortion rises when an amp is
I think a tuner only fools people to think things are working right (unless you use a Matchbox type tuner and twinlead). Depends on the entire transmission system, not whether a Matchbox or twinlead
"The round trip matched and mismatch loss here is much too high and in this case -- we can truly say that the tuner is "just making the transmitter happy," or nearly so. We have a whopping 12 dB of s
" If I recall my radio teacher, 50 ohms were decided sometimes during WW2 or even earlier. There were some switch from (I may be wrong here) from 50 to 52 ohms at one point. Lots of folklore ranging
"I'm looking for a recommendation for a PE in the Gainesville, FL area to advise me on a tower install." In the past, I've worked with Kessler & Gehman Assoc. They're located at 507 NW 60th St. in Ga
Like NF4L, I'll be installing a pair of self-supporting Pirod towers north of Jacksonville. Tower #1 is 140 ft and will support a full-size 4 el M2 40m Yagi. Tower #2 is 100 ft and will support a Ten
The philosophical objection I have is that you can't build an effective choke for the ladder line to prevent it from being a radiator. Nor prevent it from being a noise receptor. Ladder/open feeders
It's a multidimensional problem that requires more than just AC circuit analysis when a transmission line is involved. The tuner, coupler, matchbox, ATU are generally all performing the same function
"But the antenna tuner does not change the feedpoint impedance of the antenna which in my view would be actually "tuning" the antenna." All goods points and it's helpful to set definitions before eng
Roger, Wrong quote. I believe that was from KA5M. Paul, W9AC _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contestin
I've never run Heliax and its variants in the ground. Are they rated this way by the manufacturers? I'm looking at running either 1/2" or 5/8" foam lines in the ground. I'm fine with direct burial as
I do vaguely recall an older Rohn catalog (if memory serves, it was spiral bound and thick as a phone book) that showed guy anchor foundations that did prevent soil contact with the guy anchor. Do an
I'm trying to locate land in south GA for a remote Internet station. Two self-supporting towers are ready for installation. Tower #1 is 140 ft and Tower #2 is 100 ft. A full-size, 4L 40m monoband Yag
"Even here in fairly flat FL, where my dropoff to the NE is about 95 feet over a 1000 ft distance, the difference in takeoff angle compared to flat ground is significant." Thanks to all for the great
Been trying to model the legendary W3CRA site using HFTA. I downloaded the SRTM 1 arc-second data in a .TIF format from the NASA website. All is working well except that a few north bearings from the
Just discovered a data-filled version of the SRTM data: http://earthexplorer.usgs.gov/ After the coordinates are entered into the "Search Criteria" tab, go to the "Data Set" tab and instead of select
Good info. Thanks, Mike. Paul, W9AC Paul, This document has a pretty good explanation of how the non-SRTM data was blended to fill in voids: https://lpdaac.usgs.gov/sites/default/files/public/measure
Bill, Saw your excellent material from a few years ago. Last night, I ran the numbers for 17m and 15m using a hypothetical 3L monoband Yagi on the same Wincharger tower. Between 1-3 degrees elevation
I have made available my W3CRA terrain profile. These use 1 arc-degree SRTM files with data filling. A big thanks goes to Steve, W3AHL for directing me to these files. I zoomed in on Google Earth, fo
"I'm sure 60' of 20 with a couple bays of reasonable guys will hold a tribander. Cone on....this is ham radio." We didn't know any better in my high school years. Several friends had triband installa