Tom: Unless I am mistaken an "80 mph wind zone" will have 3 sec gusts of about 100 mph as a part of the 80 mph wind. To be totally comfortable with your installation I would think you would want to d
Gene: There was a Letter to the QEX Editor from DJ0IA [Jan-Feb 2003, p.60] commenting on the fact that the calculations did not take into account the effect of icing -- which is correct. The calculat
Rob What happens if one hits either LEFT or RIGHT while the rotator is turning under control of the RotorCard? Does it terminate the computer control and bring the rotator to a stop? If so, is that s
I have a hunch that this concept will not make it on 160m Tod, K0TO _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@co
Really good advice - Memory is the second thing to go. Tod, K0TO _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@conte
Jim and Rick: Tell me again how I can productively use the more precise information [0.6 versus 0.62 dB loss in 208 feet at 3 MHz.] in constructing my antenna feed line system. I am afraid I have bee
Having inadvertently started this very long thread by pushing SEND rather than DELETE on my email I am feeling a little guilty about all the bandwidth it generated. My summary for non-technical or ne
Rick: Isn't the time delay pluggable? There is too much snow between me and the tower base to want to check personally, but I would certainly hope it is easy to change if needed. That begs the questi
My experience with US Tower was very positive. The drawings [IBC version, not UBC version] arrived quickly via email attachment and were reviewed and wet stamped locally. The local engineer called th
Rick: I was told that they are available from other sources. For some reason I think that they may be from GE or some other major relay manufacturer. I think you have 'purchasing' connections -- mayb
Jim: I did not buy my tower with the US Tower bearing included. Instead I installed a different bearing. The top plate is welded in place. As a result I ended up fabricating a plate the bolted to the
Derivation of the tower equations as a function of telescoping tower height can be found in the July/Aug 2001 Issue of QEX Communications Quarterly. There is a spreadsheet available from ARRL that c
Depending on the height he has available consider using a C-pole. [QST April 2004] and also found in more detail in the new ARRL Antenna Designer's Handbook. Tod, K0TO _______________________________
I have placed the AIM-4170B sweep I made at this URL. Tod, K0TO www.k0to.us/HAM/21-24%20MHz%20sweep%20of%20XM240.pdf _______________________________________________ __________________________________
Dave: You are not confused -- I am. I pulled the wrong plot from the file and did not read the title, just the frequency. This is the scan that I should have put up to begin with. The scan only shows
Ken: K0LR and I made some experiments to see what would be the 'preferred' or 'neutral' direction for antenna orientation during a strong wind. We did the work back in April of 2002. What we found wa
Bill: I recall from last Autumn that not only is the requirement for #9 rebar, but it is for TWO such elements in each corner of the foundation. I do believe that the spec is set up for earthquake lo
I found that my C31XR was also resonant at 21.0 MHz or so. In the end I adjusted the length of the driven element -- made it shorter by about the amount the last tip extended from the DE. It was stil
I am organizing a large lot purchase of the Fair-Rite 2.4 inch toroid cores. If we can accumulate an order for 500+ cores we can capture a price of about $4 per core FOB the factory in New York. If y
Based upon the first day's email of commitments to buy, the price per toroid FOB New York is going to be $4.10 The datasheet for this toroid [core] is at http://www.fair-rite.com/cgibin/catalog.pgm?T