Anyone know how much power they are running and what antenna? Rick N6RK _______________________________________________ Topband mailing list Topband@contesting.com http://lists.contesting.com/mailman
When a top hat becomes a "middle hat", it just makes the center of the antenna look fatter, which is bad for the current distribution. If you add the whip, lose the hat. Rick N6RK __________________
Yes, you don't need to worry about coupling. Also, I have shared ground systems with 3 beverages on a single end post without apparent degradation. Beverages are in general fairly non critical. I ca
I do this on my vertical. I have modeled it, and the disadvantage of sloping down is that the radiation resistance of the vertical is decreased somewhat, resulting in higher ground losses. However, y
I've done a lot of modeling related to this issue and my conclusions are that (1) you want maximum radiation resistance to minimize ground loss (2) this is maximized by making the antenna tall and s
The recent discussion about fat and skinny verticals, etc suggests that there is a need for a tutorial on EZNEC modeling of verticals. Here's what works for me: Build the vertical to be modeled (VTBM
No it won't. You need to use the horizontal antenna as a receive antenna and the inverted L as a transmit antenna. If your rig doesn't have an RX antenna input, add an external relay. Rick N6RK ____
If anyone is interested in how to measure in calibrated volts per meter in NEC (it will work the same in EZNEC) just post here. Dave WX7G -- Isn't that just a 2 meter monopole with a high impedance l
Dave, I have measured field strength of antennas and found cases where it does not correlate with feedpoint impedance. Both the impedance measurement and the field strength measurement were done ver
Yes, I have tried that. I used some transformers from Mini-Circuits that acted as baluns and impedance transformers. This is extremely important, or else the feedline will act as a vertical antenna.
OTOH, my vertical is 1000 ft from the nearest power line and I can put a radio out at the bottom of the antenna running on a battery and pickup plenty of power line noise. Rick N6RK _________________
When I first built my 230 ft diameter ground screen (3 ft by 3 ft wire grid, all junctions soldered) I put a 40 meter vertical at the center and drove it against the center junction of the grid and m
I also have one of these oscillators. It works well for many purposes, but since you asked the question: there are two reasons why you would want to transmit on the antenna under test instead of rece
Sorry you are having this problem. My MFJ-259B is similarly useless. I just bought an AIM-4170 network analyzer from Array Solutions. It uses a narrow band receiver and should be immune from this pro
True for most analyzers, however, the AIM-4170 allows you to calibrate out any transmission line or filter in front of the unit. Rick N6RK _______________________________________________ Topband mai
I am wondering which telnet "packet cluster" servers people are using for 160 meter spots. I am on the west coast, and often the west coast nodes will show little or nothing on 160 meters. OTOH, I do
I spent most of the last 4 hours of the contest CQ'ing in the JA window (1810-1825). Greg came back to my CQ and I worked him. It was just as he described, hearing something, then ??, etc. My situati
Maybe long beverages work at your QTH. I have tried installing a relay at the 400 ft point of a longer beverage. I have listened on the beverage and toggled the relay. I get no benefit out of more t
That is very interesting, and certainly something to watch out for. I will keep this in mind if I manage to set up beverages in a low conductivity location. The skew issue has discouraged me from try