I believe that K3NA did some nice work on this subject that was published a few years back in NCJ. I don't remember the details, but I remember concluding that you don't want your 40M beam and your 1
Very sad to hear. I didn't know Milt but those that did sure describe a great person. A 70+ year old free climber that has been doing it for decades and as solid a person as Milt is described, had fu
I agree completely. So then the commercial owner should be paying for a pro and at pro rates, right? Obviously, if this is a repeater site shared on a commercial tower, then the commercial operator s
I have seen probably 50 different ham tower installations representing well over 100 towers and worked on probably a dozen of them (in addition to my own). I have never seen a ham tower with a full l
I have never done a crane install so I will let others speak to that. For Tram of a 70 ft tower, you have 2 choices from my experience. Tram to the point on the mast above the tower (say 73') and hav
If I had one of those huge X brace HD80 towers, I might consider having a safety line as well. Not quite the same as Rohn 25 - 55 style towers boys. Anyway, the point was not that their a bad investm
I have a 22 ft .25in wall steel molly mast. It is very strong. I think you are asking the wrong question. With only 4 ft in the tower and 12 ft above, with the torque translated by this very strong b
"Really? I never heard this rule of thumb before." John KK9A It was always what I learned. And seems to make sense from a moment arm standpoint. I would be interested in what others do in their desig
I used AES many, many times over the years but they never had a local store where I lived. I think that it's a case of the Internet killing a brick and mortar store that didn't adapt well. HRO and DX
As a pilot (no longer active), I went to the regs for a quote: "Over other than congested areas. An altitude of 500 feet above the surface, except over open water or sparsely populated areas. In thos
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 that you can stack 2 yagis at the same po
I think it's a mistake to run the same cable for 270ft for this application. I would run the lowest loss you can afford for the main run - LDF4 or LMR600 and then shift to a more flexible cable at th
The Quad vs Yagi debate is timeless. I always thought there were a number of things contributing to it: - Back in the day before computer optimized gain yagis, the quad was a simpler way to get more
Wilson Lamb (call unknown) stated "I have been ordering 400 equiv from Shireen. Half the cost, or less. I get it for club members and no complaints so far, after several Kft. They are pleasant and sh
At 55 ft, the performance is as much about terrain as it is antenna. You do have some capability with that tower which is rated at 21 sq ft. If you are looking for all bands on one antenna, the Stepp
I think that the modeling is to actually answer the question. Model the elements shorted to a simple ground connection (I assume 4 ¼ wave radials) vs floating. See how the spacing of the 40M array vs
Hi Jeff. I have 4 els on 20M on a 34 ft boom and its significantly more effective than a 3 el tribander. The difference between my antenna and a C19XR (3 el on 20) or 4 el STEPP IR might be less noti
Interesting. 80 of those is pretty much a market saturating number. I bet number 80 goes for a very small number compared to lot 1. Wish I could be there. I'd take one for a couple thousand. Ed N1UR
Clearly, this is "settled science". Power is measured at the final of the radio or amplifier, whichever is last. 1500W max PEP from the transmitter is clearly in the rules - as its quite clear how th