The Hy-Gain "clamshell" element mounting is very difficult to use on six meters as the feedpoint connection fans out by at least 4". I agree with Hector ... scrap the Hy-Gain boom to element mounts a
Actually to get useful information search for KB7GF ... and you will see the QEX and QST articles, plus a couple other publications detailing the Shared Apex Loop. One can also check October 2012 QST
Given the junctions between sections of the AB-577, I would not extend the mast above the top support point (bracket or buys) with any antenna load more than a small (VHF yagi or vertical). AB-577 an
The newer beta rods have a sliding short and does not make use of a hole tapped in the boom at a fixed point in order to permits adjustment of the beta match when using the "174BA Option" (page 11 o
On 9/3/2013 1:54 PM, Jim Brown wrote: Now, getting to the original question -- how to calculate the needed length of delay lines for stacked antennas when those antennas are different from each other
The issue would be matching on 30 meters since that is relatively close to 1/2 wave there and lobe structure above 30 meters. Now you're talking about something similar to the "Hy-Tower Jr." http://
I have heard that these type of antennas are not quite ready for prime time, I suspect you're hearing that from companies who don't make OWL or LFA type antennas. it has been said to me that they are
... and just *how* is a copy of CW skimmer running on a computer connected to a receiver in an operator's own shack, not connected to the outside world 'using a second person for assistance'? Once yo
Only a small portion of the LP elements carry significant current on a given frequency - only a "few" elements are "active". This means that the gain of an LP is generally equivalent to a non-optimum
I did the same study almost 10 years ago using AO (the results should be in the archives) comparing the Cushcraft 20-10 meter LP, the Force 12 C3e and original three element SteppIR. The 18 foot Cush
You've got too may variables to compare them directly. What band, different heights, etc.? Put them on an antenna range under controlled conditions and see what happens. The additional height of your
The spec for the "single pallet" HF board (1000 W) shows the 1 dB compression point at 500 W! That means the "1000 W" unit will have significant IMD above 500 W PEP and the "1500 W" amplifier will ha
Yes I have seem frequent times when my 50 ft high 10m yagi outperforms my 110 ft yagi. 50 vs. 110 feet on 10 meters is really a special case. At 50' you're already 1.5 waves above ground - a level th
I suspect your insurance agent is misinformed ... *any* structure (and a tower is a "structure") on a property is generally covered to 10% of the policy limit as as "accessory structure". This is sim
I think as a practical matter, whatever transient suppression you do at the entrance to the shack is going to be the same whether the cables are laying on the ground, suspended 10 feet off the ground
Consider a direct strike to the tower? The cables being above or below ground don't materially change the voltage waveform, at least as selection of the suppression devices are concerned: it's kilovo
There is a 10 antenna by eight radio matrix shown on pages 125 and 126 of the microHAM Station Master Deluxe Users Manual: http://www.microham.com/Downloads/SMD_English_Manual.pdf While that switch i
Increasing the wall size does not "increase the strength" of the material - it reduces the stress on the mast for a given load. Put another way it increases the load handling capacity of the mast. I
Herb, Read the RCS-12 manual. The answer you need will be found on pages 4 and 5. See the 1 of 8 configuration for the "Relay Connection Jack" and the appropriate setting for JMP 1. RTFM OM! 73, ...
Not having an RCS-12 in front of me, if you have voltage on multiple pins I can only assume one of two things: the jumper is in the wrong position (e.g. BCD 4 instead of 1 of 8) or there is a failure