According to my arithmetic, 380 ft would be something on the order of 0.7 wavelength on 160M, depending on the cross section of the tower. Shouldn't be too tough to load. It's favored vertical angle
Don't reduce anything. Load both of them with phasing between them to form an array. These towers should be VERY easy to load on 160M -- they will look something like 40 + JX, so add enough series C
I will be in the NYC area during October to attend the AES (ending Oct 12) and for a grandson's Bar Mitzva (Oct 16-17). I'll have some time during the week of Oct 12, and would be happy to fill it wi
Not an easy solution, Larry. On YOUR end, you might be able to kill it by putting it in the null of a directional RX antenna, but that won't help for DX coming from the same direction. :) The root ca
That is the generic name for the motor control system that I described in my previous post. So the advice you have received from Lee and me is the same. 73, Jim K9YC _________________________________
I don't know, but my guess would be yes. If you are on good terms with your neighbor, you may get some relief with a good line filter. Corcom and Delta are good brands. They are not expensive, and sh
Correct on all counts. To understand the problem, study the section on variable frequency drives in the RFI tutorial on my website. The primary mechanism is the magnetic field generated by that curre
Something that could be useful here is an instrumentation rig that record the level of the CW signal over time. I'd bet that there's an audio application like this around somewhere. We should poke ar
Good question, Pete. Not dumb at all. The best answer I can think of is to note that 1) the common mode current is flowing on the coax shield, 2) the earth is far from an ideal conductor, so the conn
The T-section sort of thing you're describing would be more important if you were using beads rather than coils. With the relatively high impedances you can achieve on 160 with 7-10 turns through tha
Nothing wrong with it, but the common mode impedance curve is strongly influenced by the physical size of the core, the transmission line, and the winding details. If you're prepared to wind some des
I'm sure this will come as no surprise to the old timers on the list, but I'm passing this along to the newer guys. In contests, activity often goes pretty high in the band, and it's nice to be able
I can not provide a comparison, simply because my Beverages run up and down ravines, and terminate into the side of upslopes. I'd estimate the elevation change at 40-50 ft. For both beverages, both e
That's fine. I suspect that differences from ideal will be small. If you want to improve things, add some short radials in the immediate vicinity of the base. 73, Jim Brown K9YC _____________________
The story I've heard is that some dishonorable hams have submitted cards where 18 MHz QSOs were changed to 1.8 MHz. 73, Jim K9YC _______________________________________________ Topband mailing list T
As the designer of the coax chokes using clamp-ons or toroids, I'll step up to respond. They are a real "brute force" design, adding a VERY high impedance in series with the common mode circuit. As a
Yes, conditions were stinko. NR6O (N6RO) is about 100 miles from me. I spent a lot of time on 40 and 80, but only went to 160 long enough to grab Ken's mult. Didn't even tune up the amp. 40 was OK to
Ground rods are now $21 at my local hardware store, and depending on where you live, getting another one into the ground can be a challenge. The effectiveness of chokes wound on mix 73 degrades signi
I don't agree. The antenna is part of the common mode circuit. Disconnect it and you have a different circuit. 73, Jim K9YC _______________________________________________ Topband mailing list Topban
Very interesting. Thanks for contributing this. Carlos's chokes are essentially the same as mine on 160M. See measured data on pages 43-44 of http://audiosystemsgroup.com/RFI-Ham.pdf and compare to t