I think folks like N4HY and SM5BSZ have been working on the rudiminents of what you describe, Jim. I recall N4HY describing a DSP noise blanker whereby you would look at the time samples and then ess
realist, This is where the ARRL could help. The have a very nice lab that all past and present members have helped to pay for. They could easily test stuff like this a publish the data in short produ
time I be 100-200 Yes, that is where forum's like this can come in. Why pay an engineer or test lab to do destructive testing when your customers will pay you full price for the priviledge of doing i
Cable Xperts advertises that they will build custom coax jumpers to order. It wouldn't surprise me if you could arrange to send them the beads and let them do the assembly. Might be a good thing for
RG8X jumpers will run noticeably warm at 1.5KW key down at 30 MHz. Power loss is still pretty negligible, however, for short runs (.11dB for a 6' jumper at 28.5 MHz -> 38 watts distributed across 6 f
I was under the impression that soil conductivity mattered a great deal when using vertical polarization. With respect to horizontal polarization, however, I would agree that it doesn't matter all th
Dave, Junk antennas are not a recent invention. Telrex made some pretty shaky antennas too. Back in the 80's KS8S had two of their 3 element 40 meter yagis stacked on a 180' tower. The stainless stee
Dean had a pair of the 29 foot boom model - one at 90', and the other at 180'. When I went up there, my expectation was that I would be the loudest guy on the band (there weren't many 40 meter stacks
This is a pretty interesting discussion. I don't quite have my head wrapped around a few of the issues, but I would like to make the following comments: 1). The concept Jim describes is used at highe
There's have seems Some interesting class E designs have been demonstrated by Dave Rutledge at Caltech using really cheap MOSFETs. These are narrowband, however, and also require somekind of envelope
Wayne, This guy had a display at the DX Convention in Visalia, Ca last year: http://www.hamation.com/ Looks like a nice concept for remote control of antenna switches and the like, but I am not aware
Steve, For the "optimized" yagi's in the ARRL antenna book what were the optimization criteria? There is a tradespace between forward gain, pattern and VSWR bandwidth, and F/B. With a SteppIR you mig
I have been thinking the same thing, Kelly. I think a 3 element SteppIR with 13.9 MHz parastitic elements and a the 6.9 MHz MonsterIR driven element would be a big hit. Rotary dipole performance on 4
In terms of RF performance, I don't think you would notice the difference between insulated and un-insulated wire. If the wire is going to be on the surface of the ground or buried just below it (you
Yes, good suggestion, Raj. I just made some measurements on a 2.4 inch O.D. type 31 Fair-Rite Products core that K9YC sent me. 7 turns on this core will give you >1000 ohms choking impedance from 1.8
TV, or a phone in your house or in your a neighbors? What bands where you TX'ing on and how much power. Dave, I am not sure who you addressed this question to, but here are some examples of what I us
You could also put a shunt arm (20 to 30 ft long) near the base of the 175' tower and then adjust it for parallel resonance at the operating frequency of the 4 square using a variable capacitor in se
I was talking to a friend of mine recently about the frustrations of low-band DXing from a small city lot and the possibility of purchasing some land in the boonies for purposes of building up a remo
One element of this debate is whether or not you can generally say that for any free standing tower structure there exists a specific guy wire configuration that will result in an increase in the ove
It occurred to me that my 45' tall tilt-up vertical made from 2" O.D. thin wall tubing may be germane to this discussion: http://www.dellroy.com/W4EF's-Ham-Radio-Page/Stew-Perry_El-Mirage/El-Mirage.h