Actually the very old rules for Citizens Band did have a "20 feet above the structure" limit. If I recall correctly - this comes from 40 years ago - the rule applied to the highest point of the ante
Will-Burt's pneumatic masts are used extensively in broadcast news and government "mobile command center" applications. They are solid, well performing products and a premium price point. I used them
The tribander should not be effected by the Moxon since its elements are only about 1/4 wave on 10 meters. The real question is how close can you get the tribander without effecting the 6 meter anten
Like Pete, I am (was) very familiar with that ridge ... with all of the stations converted to digital the only possible issue will be channel 13 but it's not likely to effect anything on HF, six or t
Correct. Also correct. Absolutely not. Your interpretation is incorrect. The vertically polarized radiation is proportional to the integral of the current from the feedpoint to the junction of the "
Failing to bond the power line entrance ground (safety ground), tower grounds, "entry window", and telephone/satellite/cable grounds together is a prescription for equipment damage. USB interface ch
But only on a single band (or at best 80/30, 40/15 meters). Unlike the "normal" dipole/doublet the folded dipole presents a zero Ohm (very low impedance) load to the feedline at all 2n harmonics. As
Maximum NVIS signal occurs when the antenna is 1/4 wave above ground (33 -35' on 40 meters) - not at 1/8 wave (16'). Any analysis that recommends heights at or below 1/8 wave is flawed in that ground
Sorry, Pete - elongation/stretch makes a big difference. Please review the tower studies by K7NV on his web site ... http://k7nv.com/notebook/towerstudy/towerstudy1.html Pay particular attention to "
The easiest way to control a Tailtwister or HAM series rotor from two locations is simply to parallel two control boxes with a couple minor modifications. 1) In one control box remove the 1/8 A fuse
Check the dielectric in the 20 and 30 meter traps capacitors - http://www.telusplanet.net/public/telwest/R7/cushcraft_trap.htm http://www.iol.ie/~bravo/r7_vertical.htm If SWR is correct on 20 meters
The wind zone map in that document contains no legend. Exactly what are the numbers/contours intended to represent? 73, ... Joe, W4TV _______________________________________________ _________________
Both modeling and theory strongly disagree with this ... The active portion of an 8 element 13-32 MHz LP on an 180 foot boom is a small portion of the total boom length. Here are model data of an 8
Dennis, It won't matter since this list now defaults to "Reply to the list" instead of "Reply to sender." Most readers are too lazy to copy a reply address from the body of the message (or header). 7
Unfortunately, if one wants a log that will hold up to any kind of wind for more than a couple years, it is not going to be cheap or light. The logs with light weight (small diameter) elements are n
Except when we get to 36 foot booms a yagi is capable of 10 dBi on 20 meters (4 element) and 11.5-12 dBi on 10 meters (6 elements). Not to bang the SteppIR drum too loudly but the 4 element antenna
Absolutely correct. However, it was compared element length and spacing data for both the Cushcraft ASL-2010 and the then current Tennadyne T8. The Cushcraft and Tennadyne designs each had only mino
I don't think that anyone is ... although I think the four element SteppIR has to be about the best single antenna 20-6 meter solution available. I'd like to try something similar to the 80 meter di
Which is why W2VJN's stub cookbook shows some interesting behavior with 1/8 wave connecting lines <G>. Without getting the book off the shelf, I believe he was using 1/8 wave between the amplifier a
Heath SB-1000 and Ameritron AL-80 are pi-L on 160 & 80, pi above that. SB-200/SB201/SB-220/SB-221, Drake L4 and L7 are pi-network. Ameritron ALS-600 is a solid state amp with lowpass filter outputs (