Undesired power levels are **generally** worse from a higher frequency element to a lower frequency element, rather than the other way around. The wider the spread the greater the difference. My 15M
Sometimes things get useful when the information is wider. <<snip>> I disagree with that, Jukka. Traditional filters neither route things to a ground nor dissipate a significant portion of unwanted
No, not if you want to know the true amount of available power. :-) See my long post. _______________________________________________ CQ-Contest mailing list CQ-Contest@contesting.com http://lists.c
It could be much more than that, actually. Maximum power transfer would occur when the optimum impedance on 15 meters for the 20 meter element is presented. The simple cheap test would be installing
It's pretty simple to do. I have a 8 position switch box in my radio room that has stubs on ports. This is the same box that selects antenna trunks to different areas. I use steering diodes to activ
I was considering band splitters to allow single feeders to be used on multiple bands to save cable, not necessarily for feeding one antenna. I would split bands at both ends. The only worry I had,
Here is the problem, although appearently it is difficult to get across. :-) Filters do not dissipate out-of-band power, they reflect it. Stress on the filter will vary with filter placement on the
Hi Guy, The reason why I find this interesting really centers around two things: 1.) making things work as well as possible for the investment appeals to me 2.) it's interesting to learn how stubs a
Keith, I added a SPICE model of two low pass 3.6 MHz filters to my webpage. You'll see the stress on parts there for a 100 volt peak source through a 50 ohm resistor, which is about like a 50 watt t
6.4. The use of non-amateur radio means of communications (e.g. telephone or the Internet) for the purpose of soliciting a contact (or contacts) during the contest period is inconsistent with the spi
Snubber micas are good capacitors, generally they work out better than conventional micas in RF systems, but they are not really characterized for high power RF applications. Over the years the data
Dave, Thanks for the great examples of how things really work!! None of the silly nonsense that 1 dB = 100 QSO's or other junk science. The result of this, is anyone will see, is a little bit of gain
The stub operates at near infinite SWR, so it does not need to be a 50 ohm stub. You'll do OK on the pass frequency because the higher impedance offsets the extra cable loss, but the notch won't be
The correct combination of series lumped component and 1/4 wave 15M stub could make an open on 15 and short on 40. RG6 it would take a ~500 pF cap in series with the center conductor on a 15 meter s
Thinking about that logically, it appears it would still pass 40 meters to me. The reactance of a 30 degree shorted stub is the same but opposite sign as a 60 degree open stub. The result would be a
Real stubs in real systems can have over 15 dB variation in attenuation, depending on electrical spacing from the antenna, and a lesser extent spacing from the amplifier or radio (which usually is d
I sure agree with that. We have deadlines at the front to get ready, and weekend restrictions. With new close deadlines added to the end, it just extends the weekend even more. For people who have n
My bet is on an increase in non-submitted logs, not that those logs matter all that much. _______________________________________________ CQ-Contest mailing list CQ-Contest@contesting.com http://lis
Sarcasm does not come off well in written text. I was being sarcastic. My guess or assumption (which is all most of this is, lacking full statistics) is those who are accustomed to creating files an
I would measure it, which is easy to do accurately with a dummy load, radio, and a movable power meter. I have 20-30 year old cables that are well within new cable loss specs. The primary cause of e