Correct ... that's what I get for writing that "late" last night. 73, ... Joe, W4TV According to the A3WS manual, the turning radius of the base antenna is 14' 4". The 30 meter extension (A103) manua
A3WS manual: <http://www.cushcraftamateur.com/Downloads/index.php?productid=A-3WS&filename=A-3WS.pdf&company=cushcraft> 30 Meter add on (A103): <http://www.cushcraftamateur.com/Downloads/index.php?pr
It was just un-satisfactory so i pulled it down and replaced it with the 160 antenna I still use today. A full wave loop fed at a lower corner, top at the same 110 ft point. I did have to tilt it 15
true vert radiation, then feed it part way up on one side. I believe it had to be fed 1/3 the way up one side of the loop. Then route the coax straight across from the elevated feedpoint....to the to
All of this applies to a "delta" (triangular, apex up) loop. Other formats of vertical loops have different rules for feeding to maximize vertical polarization ... for example a diamond (square) loo
in our universe, it is not only rare but exceptionally rare, to see a safety line running the length of a tower. While it may be rare to see a safety line, it should not be so. I can recall several u
The 402BA/402BA-S insulators are not at the center point. The "center" is connected to the inner end of the linear loading which then connects to the elements at the insulator. That places the insula
Unfortunately, there is little value in "good will" for small businesses these days. The truth is that the liquidation value of inventory, receivables and physical assets (real estate, plant, equipme
I would like feedback on the pros and cons of running cables elevated versus underground. Thanks in advance. The only time I would consider elevated cables is if they were covered by a metallic "ice
I located the website _www.gpxantennas.com_ (http://www.gpxantennas.com/) . owner SP7GPX. The correct website is <http://www.gxp_antennas.com>. Owner's callsign is SP7GXP 73, ... Joe, W4TV Hi Guys, I
Erecting a Spiderbeam on an AB-577 is not easy. The antenna would need to be built from a 6' - 10' step ladder or work platform/scaffold - the "spider" sets three to four feet above the rotator and
Yes, the Spiderbeam has something like six "boom trusses" on top, four on the bottom and four going spreader to spreader to hold the "booms" square. When you add something like 10 (for the 20/15/10
The guy wire assemblies are a military design (used on the AB-577 and AB-621 that I'm aware of). I suspect the tower is military surplus based on the use of the SM-D-423650/423651 guy assemblies and
My QTH is looking into a ridge to the N, E, and SE that rises 200 - 600 ft from my ground level, so higher is better. That SteppIR at 120 ft gives me a horizon between about 12 and 15 degrees to all
HFTA does not include propagation values for 6 meters. If you look at the *.PRN files you will see values for 80/40/30/20/17/12/10 but not 160 or 6. When using HFTA on 6 meters (or anywhere on VHF/UH
It has to do with the coupling between the center conductor and the shield of coax -- when current flows in the center, an equal current flows in the shield, and we're stuck with the loss of both of
On 8/9/2016 12:48 PM, Ed Sawyer wrote: I could be wrong, but I believe that HFTA adds 3dB for stacked antennas and uses the center point of the stack to do its calculation. I base that on the fact th
30/60/90 looks good in HFTA based on "no nulls" in key directions for most areas over flat ground - particularly on 10 and 15 meters. However, it is not really good on 20 meters. Similarly 50/100/150
EZNEC using "real ground" says such a phasing system is not worth the time/effort. Remember, the ground reflection is always out of phase with the "real" antenna so any phase difference one applies t
Does anyone have a Rohn SDB25G "single drive base" that is surplus to their needs? I'm not installing anything high or large (a WX station - that I need to get above some obstructions around 30'). 73