Hi Andy, I would offer to consider the pro's & con's of converting it into a Moxon - much more useable bandwidth. Matt KM5VI Hi to all, looking for a little guidance with a 402ba 2el 40 mtr yagi. As
Hi Tony, It is not a good idea to use AL to expand your ground system. The galvanic corrosion at the CU-AL joint would be negligible compared to the rate of corrosion loss of the AL metal in direct c
Rick is correct - I have several crank-ups and the pulley bearings get dry over time. My approach is to pull them out, remove the bearings, clean the bearings up in the parts washer, drill a small ho
life as normal? With respect to the question about "go back to life as normal": GDT manufacturers product data typically rates the number of shots for a given tube based on the maximum surge current
"The exceeding of some maximum value of operating parameter by accident, which can create a catastrophic failure A failure caused by increase in temperature is usually time dependent..." "(the vario
FYI... You can also just right click on the cell(s) and choose >Format Matt KM5VI --Original Message-- From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of Dan Maguire via TowerTalk
Hi Bill, Perhaps someone out there knows the specific answer to your question, but since I did not see a response (yet) perhaps the little info I know may help you in some way. Perhaps someone knowle
Could someone help me out with some advice. How much separation between circuit board traces in an antenna switch box would be recommended to reliably handle the voltage associated with legal limit a
All comment appreciated & thanks! I tried to put together everyone's good ideas and just finished etching a prototype board about an hour ago - sure takes longer for the 3oz material. The boards are
Just want to echo John's comment about the 20m - 40m interactions. I have a pair of stacked 204's going up with a 40m Moxon. I had to move the upper 204 about 15' away from the 40m to get the 20m int
... and P40A put out a bodacious signal on both 40m & 20m! :) Matt A Moxon antenna may react differently than a loaded element 40m beam. I have never modeled a Moxon. I had very little interaction be
foundation? This can be done with a relatively small piece of equipment if you can get close enough to the foundation. I have seen underground concrete thrust blocks used on large piping systems suc
Tony, For what it's worth I bought a replacement part for a G-800 about 15 years ago. The only parts source I could find at that time was Vertex Standard. Although I expected that the price would be
Hi Lee, If your measurements are exact, then you would have what is called a "zero clearance" fit. Not impossible, but zero clearance is at best challenging to assemble. Aluminum telescoping tubing (
Hi Kelly, Assume you are referring to the 3 element versions... The Junior has a 12' boom and the element traps are only about an inch in diameter. The Senior has a 14' boom and the traps are about 2
Correction... Regarding item (3): I checked back on my notes and I did not remember it correctly. Both the 0 deg and 90 deg port of the hybrid should be operating at or near the input impedance. (It
Hi Roger, On cursory review, here are some thoughts that come to mind... middle, front and rear elements with a three way hybrid combiner (1) How are you achieving the plus and minus 90 deg phase shi
with a 40m moxon stacked below it at about the same spacing that you are looking at. When modeling the antenna combo, there was enough interaction to predict a fairly significant drop in input imped
Although mechanical engineers receive training in stress analysis, you really would want a structural engineer to weigh in. Failure theory considers different modes of failure, which, ultimately tran
Gary, Try shortening by 3% for 4" aluminum vs 12 AWG copper. Matt KM5VI I am helping a friend with an 80 meter 4 square vertical. Can someone tell me how to calculate the difference in length when 4"