No question -- use a dedicated twisted pair for every circuit that you want to control. Shielding is FAR less important than twisting. Bond one of the conductors to ground at the sending end. This pr
Yes. That's exactly right. The reason is that the stub works by putting a short circuit on the line at the frequency that it's tuned to. The lower the loss, the closer the value of the short is to ze
No problems anywhere I've used them, and I've used them throughout my QTH in Chicago and here in CA. I've recommended them to a lot of others, and no reports of problems. Mine were (and still are) on
http://audiosystemsgroup.com/RFI-Ham.pdf See Chapter One -- Some Fundamentals. 73, Jim Brown K9YC _______________________________________________ _______________________________________________ Tower
I understand your dilemma, but sorry, not on 40 meters, UNLESS you used a LOT of them in a "string of beads" configuration. By a lot, I mean 20 or more of #43 or #31 that are 1" long. To understand w
BUYER BEWARE: I was at a Home Depot near San Jose last week and found a dispenser display labeled Scotch 88 and Scotch 33. The tape inside, however, was branded "Plymouth." 73, Jim Brown K9YC _______
Every time I go to Home Depot I find another reason to go somewhere else instead. :) 73, Jim K9YC _______________________________________________ _______________________________________________ Tower
You might look at Belden Mediatwist. Their construction causes it to be far more uniform in real world installs with bending, etc. It inherently resists deformation when pulled, bent, etc. When I ins
While we're discussing the path to ground for lightning, remember that the energy in lightning has a broad (several octaves wide) peak around 1 MHz, NOT at DC. Resistance to earth of a typical ground
In general, the vertical portion of the antenna provides the vertically polarized component of radiation, and is more lower angle radiation. The horizontal portion radiates horizontally polarized, an
to be brought back to the box separately from the equipment ground. NO -- unless the amp is also pulling 120 volts from the power line. A proper 240 volt circuit is two hots and an equipment ground.
Also hosted by contesting.com, the host of this list. Poke around there and you'll find it. 73, Jim K9YC _______________________________________________ ______________________________________________
It's important to understand that the function of radials is to act as a return for antenna current and increase the EFFICIENCY. They do NOT lower the angle of radiation -- that happens with actual E
EXACTLY! 73, Jim _______________________________________________ _______________________________________________ TowerTalk mailing list TowerTalk@contesting.com http://lists.contesting.com/mailman/li
me The most likely cause of the audio rectification is a pin 1 problem in the TV or in something that the TV is connected to (like their stereo system). Study the relevan sections of my RFI tutorial.
I've just posted a new version of my tutorial on RFI, Ferrite Chokes, Baluns, and audio for hams. It has the same filename as the original, but the title shows Rev 1, 25 Jul 07. The new stuff is prim
It doesn't matter -- it's RESISTANCE we want, not inductance. But 6 meters IS a challenge for a choke balun (it's also quite a challenge to measure). As Jim Lux suggested, a multi-turn choke WILL wor
Sorry. http://audiosystemsgroup.com/RFI-Ham.pdf Jim _______________________________________________ RFI mailing list RFI@contesting.com http://lists.contesting.com/mailman/listinfo/rfi
Yes. I've devised a method of winding transmitting baluns using coax the size of RG8 and RG8X that minimizes the stray capacitance and results in multi-turn chokes that have relatively high choking i
Mike, W6RMK has given you good advice, but a fair amount of what has been written on this topic is of questionable accuracy or relevance. I suggest that the FIRST thing you should do is download and