For whatever it's worth, I measured the loss in my main run of CATV hardline right after it was installed, as well as the SWRS of the various antennas connected to it with pigtails of flexible coax.
More than likely the hit to your mast caused induced voltages of a few hundred volts on your nearby AC service, particularly if it is above ground. Most power companies can now provide a whole-house
I am using a single half-wave of CATV at 1750 KHz (about 210 feet), measured at 28000 KHz, and find that it gives me acceptable SWRs (2:1 or less) at the shack end on all bands, including on 10M. I m
Strikes me that the Force 12 low profile towers are another possibility. I believe they make one that is no more than about 8 feet tall when nested. 73, Pete N4ZR
A point I don't think anyone has yet made this time is that there may be circumstances in a given configuration of antennas on the tower where either a shorted or an open configuration may be desirab
Yes, but this also has the effect of concentrating any loads contributed by the fixed yagi on one leg of the tower, which doesn't strike me as a very good idea. I can't do the math to analyze how muc
Not picking on Rich (I don't know whether he is "pro" or "con" on this), but I hope this idea won't make any headway. Fragmentation of this list into separate special interest groups would lose the p
I'm not familiar with the Create clamps, but in the case of the Yaesu rotators a lot of the problem arose from people's not understanding how to tighten them properly. If you tighten the clamps on a
I just installed a Butternut HF9V on the galvanized steel roof of my garage, using the roof in place of radials. Just a couple of things I thought people might find worth knowing: -- I could not use
Do you really mean "HF?" I think it will prove unsatisfactory, being that close to a grounded tower. When you say you were "told", do you mean that you got this information from the Rohn catalogue? I
I used a pressure washer, professional (rental) power. Worked fine, but I'm still finding big flakes of orange paint in my gravel driveway 5 years later! 73, Pete N4ZR Sometimes a tower is just a tow
That was certainly my experience. Anything the pressure washer wouldn't remove, I just painted over. Where it went down to the bare galvanizing, I used a primer specifically formulated for galvanized
Not to mention the ~6 dB of ground reflection gain, though I grant you it is apt to be at a pretty high takeoff angle unless the dipole is quite high. Still, the lower half of the first lobe can exte
I believe that most models - certainly prop models like VOACAP -- specify that they are not accurate below 2 MHz. I suspect the same is true for NEC-2 and 4. Does anyone know for sure? 73, Pete N4ZR
This is certainly true, but there is another good reason, and that is that the sheer magnitude of the task required to accurately measure a phenomenon is impractical. I remember that back in the 60's
For some reason, the reflector strips out the mathematical symbols for plus or minus. That's what I meant, "plus or minus 1 dB." 73, Pete N4ZR _______________________________________________ Self Sup
In some instances, such monitoring involves medium-wave signals that are below the accurate frequency range of VOACAP, but the majority of monitoring appears to be in the SW range. The International
Tom, I don't disagree with your point at all. The ONLY thing I was trying to point out is that modeling is one useful tool, among many, that learning how to do it better is worthwhile, and that knowi
At 12:23 PM 7/14/02 -0400, Tom Rauch wrote on the Amps reflector: Conversely, would I be safe in assuming that the EIA Class 2 3000V-rated disk ceramics in, for example, Mouser's catalogue (10% Y5P t