Hey Jim, It would be interesting to look at near field plot from the Cobb vs. a regular dipole. On his website, the inventor claims that it doesn't couple very strongly to nearby objects and is there
Hi Jim, I just plugged a quick model into MultiNec and got results similar to yours in terms of feedpoint impedance and pattern. The 2:1 VSWR bandwidth (12.5 ohm reference) is about 175 KHz with ante
I don't know. He seems to shift at random between measurement references. First he compares his antenna measured over ground to an isotropic reference, then he compares a straight dipole over ground
Well, it goes to his overall credibility. He claims that the E-field off the ends of his antenna is lower than for a straight dipole. As to whether that matters or not to anything performance wise, I
Fortunately, we have very good computer modeling tools these days, Con, so it is much harder to fool the consumer if he is doing his homework (at least when it comes to antennas that lend themselves
I was particulary impressed by the 18dB Front-to-Back ratio :):) That is almost as bad as those "Jo-Gunn" CB Antennas that have "Audio Gain" :) Mike, W4EF............................... _____________
Good points, Rick. That is probably why the ARRL came up with contests and the DXCC program. Both programs motivate vast numbers of hams to maintain top notch HF communications capability. DXers and
If your hobbies don't include outdoor things like ham radio, living in an HOA controlled community is probably not a big encumberence. If your passions are listening to music (well not loud anyway),
It's interesting where I live here in Tujunga, Ca - Rob. We are right in the foothills of the San Gabriel mountains just a stones throw from the Angeles National Forest, but only 15 minutes from down
I was thinking of getting a screwdriver antenna for my pickup truck and was wondering if anyone out there has any experience with the various models of the N9JMX Predator or the Tarheel line of screw
What I was thinking about for my small suburban lot was a big IR driven element attached to a mast pipe in concert with a single regular IR parasitic element cantilevered on a short boom off the mast
Yes, for an 80/75 meter design you are probably correct that a set of variable lumped elements would be just a flexible in terms of adjusting the center frequency and pattern of the antenna. It would
I think what everybody is trying to say is that for a fixed 40 ft boom length, you don't gain much by increasing the number of elements beyond 4. That doesn't mean that 5 can't or won't work as well
Joe, Here is a commercial solution made by K5RC http://www.consultpr.com/SNMain.htm Looks like it would work, but I haven't tried one myself. 73 de Mike, W4EF.........................................
Another way to look at it is to think about what length of run would represent 3dB difference between the good feedline and the cheap feedline: LMR-400 vs RG-8X 1.8 MHz 1300 ft Delta $ 390 3.5 MHz 87
If you guys are talking about Michael Copps, he has been the lone dissenting voice on BPL since the beginning. While I think his main concern has been that electric rate payers might end up cross-sub
I have heard people who seem to know about this stuff saying that BPL is just a political tool that the commissioners are using to light a fire under the DSL and CATV people to extend coverage to und
During his talk at Visalia, I asked Dean, N6BV why his TOA statistics showed that takeoff angles would be higher on 10 meters than 15 (he was showing a case study comparing TOAs at W6NL and N6RO). Th
Maybe we should ask this guy what his position is: http://www.vote-smart.org/bio.php?can_id=BZZ91748 :):) Mike, W4EF....................... _______________________________________________ See: http:/
Tony, is the A3's Front-to-Back on 10 meters about the same as it was before the change in 20 meter VSWR (it is probably worth checking front-to-back on 15 and 20 as well)? If the F/B is unchanged, t