I would disagree with you there. Coax lengths that are an odd multiple of a quarter wave are the worst lengths for common mode problems in the shack as they place the shack at a voltage maximum. Prop
That, of course, is the problem. Even if the "entry window" at ground level includes a single drive ground rod, the coax may not be even qualify as poorly grounded for RF resulting in a significant
While common mode current may be a bit of a misnomer, it is accurate in that the effect of "outer shield current" is identical to that of common mode current in a balanced system because of the "pin
No, you will find the FCC's ruling on OTARD (over the air receiving device - e.g. satellite and TV antennas) applies to private contracts including HOAs, rental contracts, and builder imposed deed li
Bill, Don't pay any attention to the elevation statistics for 6 meters from HFTA. In a private e-mail exchange with Dean some time ago, he pointed out that there are no elevation statistics in the pr
I disagree - don't burden my mailbox with bloated HTML e-mail, graphics and attachments. If you need to post pictures, put them on your web site and include a link. Still, I do not believe the softwa
RCS-10 uses a "binary tree" arrangement of relays. You will probably find the input relay has been arced so that both the normally open and the normally closed contacts are connected at the same tim
The RCS-10 does not use double pole relays - at least according to the schematic in the Instruction Manual. It uses seven SPDT relays connected with four, two and one coils connected to the A. B and
Not if the overall switch is designed properly. If the switch is based on two relays per antenna and unused antennas "float" relay capacitance will cause coupling problems. However, if the switch use
1) I would run the coax and the ground/power via the same route even though they would be in separate conduits. 2) I would not bury steel conduit ... it will most likely rust in short order. Use PVC
Absolutely not ... study "crossfire phasing" (W8JI term) or look for information on frequency independent phasing. For receive operation flipping phase of alternate elements allows phasing to work ac
Jim, It's a company that BOUGHT stuff from the government and is reselling it. No, this is the government that is requiring "demilitarization" - total destruction of the trailer mounted towers. Note
running this problem through a mast calculator program shows a wind survival of 93 mph with the following assumptions: That also assumes no ice. Add even 1/4" to 1/2" of ice and the wind survival dro
You were not only lucky, you were exceptionally lucky. 73, ... Joe, W4TV Mine lasted over 30 years!!!!! running this problem through a mast calculator program shows a wind survival of 93 mph with the
The person who asked the question has a KL7 callsign and the FCC database shows an address in Anchorage! Of course, current standards for towers require that most areas calculate windload and surviv
Based on the K7LXC/N0AX tribander tests, I'd take *anything* over a Mosley antenna - even a rotary dipole. 73, ... Joe, W4TV If you had a choice between antennas which would you choose a Mosley Pro 5
near field measurements are full of problems also. besides the problems of projecting the near field pattern to something that is useful in comparing in the far field there are all the little distort
He tested several antennas against the quad, by visiting each test antenna owner's station, and reported how well each test antenna stacked up against his reference quad. The reference antenna was a
Not good practice in the US. Power supply ground (as opposed to neutral) and RF earth ground should be the same. Otherwise any lightning induced surge on one or the other will result in a voltage dif
No - areal boom for fire fighting, yes. Notice the nozzle on the front end. Even then - before integral sprinkler systems - there was a need to deal with fires on the top floors of the "sky scrapers