On 7/24/2017 8:58 AM, StellarCAT wrote: Now that stated I'd say this really is for a 2 stack ... with a 3 stack you see more of a difference between 3IP and TOP... and with a 4 stack as well ... so a
If you intend to model a Moxon, particularly the Leeson Moxon, you will need software that uses the NEC4 engine. NEC2, commonly used in amateur software because it is free, does not handle right angl
Note: I presently have an inverted "L" which comes off the 115 ft tower and the horizontal component goes East to the 92 ft tower. It is a cloud warmer to EU, but fantastic to the west coast and the
should the beta tubes running on top of the boom be level and straight all the way across the boom, or does it take a bit of a bend when going past the balun point and the boom to mast mounting plate
So there is no propagation such that Antenna 2 picks up the noise In practice, it is not *radiated* noise that is of concern. The noise on antenna 1 is actually *conducted* into antenna 2 by the bond
As I've tried to emphasize, the most important reason for using a choke is to suppress RX noise, but by suppressing common mode current during TX, we minimize crosstalk to other antennas. By suppress
Ideally (and this may be too many wires to be practical) I would like to construct an 80/60/40/30 meter fan dipole requiring only a single rope at each end. Major project is OK if the end result is v
You really need to bite that bullet. Shales have a wide range of strength and you need to know exactly both the compressive and tensile strength of your particular shale. this stuff is a step down fr
Or computer networking/terminals with old coax based ethernet, twinax (shielded, twisted pair "coax"), etc. There are simply too many systems that use shielded cables to ignore their impact when loo
It's effective a "halo" or "squalo" on each band. It will generally be down a dB or so compared to a dipole but without the significant nulls off the end like a dipole. Feed point impedance will be
Doesn't work - at least for me. The 80 meter element is too short but close enough to being resonant on 30 meters that I was never able to tune the 30 meter element so that it yielded a low SWR (show
Dan, The "diamond" option is interesting ... are the feedlines connected from feed point to feed point or are they all connected in parallel at the "balun box"? Have you tried modelling a 40/30 meter
You lose the "ground gain" ... it becomes a vertical dipole but with nulls "broadside". Most of the Cobweb style antennas I have seen stop at 20m yet they would seem an ideal way to get reasonable s
On 11/1/2017 1:09 AM, Don W7WLL wrote: Have any changes ever been suggested in the ham community that might lead to improvement in structure or operation) If either of the latter are available, I bet
I want to be able to switch a piece of #14 house wire onto the far end of a sloper wire I have for 75 M phone so I can operate lower in the band. I'm thinking of adding a relay in a weather-resistant
If I use a DPDT center-off switch on the DC supply in the shack and steering diodes in the relay box at the tower top, I can use two relays to short out part or all of the loading coil at the feedpoi
CDE (HAM-II/III/IV) manuals/schematics are available from Hy-Gain online or the Boat Anchor Manual Archive (bama.edebris.com): <http://bama.edebris.com/manuals/cde/>. If have a copy of the RotorEZ ki
Jim is correct here ... 72' is a half wave on 40 meters. Stacking a second antenna at half that height would put the lower antenna at *one* *quarter wave* above ground. The lower antenna would have i
microHAM make 10x2. One can cascade 6x2 and 10x2 to get 14x2 or cascade 10x2 and 10x2 to get 18x2. 73, ... Joe, W4TV David Robbins K1TTT e-mail: mailto:k1ttt@arrl.net web: http://wiki.k1ttt.net AR-Cl
The microHAM iLINK to Ultrabeam cable is an active device (TTL to RS232 converter). The schematic is not published but the pin designations for both ends are available by reading (studying) the micro