Horizontal dipoles (and Inverted Vee Dipoles also) only have a perfectly horizontal polarization directly broadside to the antenna. The polarization gradually tilts, and reaches vertical directly of
The wide filter or a wider filter works best with the 1000D and all of my other receivers. The reason a DSP system works poorly on the audio line is the DSP system looks at wave shape. Noise normall
Hi Bob I asked: Then what are you saying? Below it sounds like you are saying the coupling would be worse, and so the dipole would have added attenuation to the tune of almost 24dB compared to a vert
Bill, Pete, and others, 24dB is significant loss, and vertically polarized losses were near zero dB. That should be very easy to see, since it is a profound difference in level. Some SSB transmitters
Typically I see large repeatable differences ONLY when comparing a low dipole (around 100 feet or less high) with a high dipole or vertical over a path several hundred miles long or longer. The aver
DSP can work very well with impulse noise, just as well as a conventional blanker system, if bandwidth of the system before the DSP processing is wide and does not overload. The same is true with an
Hi Bob, Some key elements appear to be missing in all of this. Were there ever any A-B tests made to confirm the predictions? Can you point me to descriptions of those tests? Is 20dB the maximum pos
While almost anything will radiate...with a short vertical section Inverted L making the antenna longer decreases the useful low-angle radiation. It also does not necessarily decrease ground losses
I generally use a field strength meter with a built-in loop antenna. I do a skeleton proof whenever anything is changed to be sure my vertical patterns are OK. It is possible to find inexpensive sel
While "shield" may be a poor choice of words, a large yagi or yagis mounted low on a shunt-fed tower can have a detrimental effect on system efficiency if they are large enough or enough of them. I
Hi Don, The impedance of the antenna is fairly low. A metallic mast won't make any difference as long as it is more than a fraction of an inch from the wire. 73, Tom W8JI W8JI@contesting.com
Having over 30 antennas is a good test bed for proving reliability of a system. I can't afford to constantly check and replace resistors after storms. Despite being in Georgia, with frequent afterno
Use a reasonably close-spaced spark gap across the resistors (making absolutely sure you use composition resistors of course). Same at the transformer end. One simple way to do that at the resistor
I think the biggest problem for an absolute answer is a lack of reliable verification data. Very few amateurs have enough room to install a textbook perfect vertical, let alone a horizontal at a few
What is defined as a "tail-ender"? I assume you mean calling **before** the DX station has sent "TU" or whatever the final close of a contact is? I agree with UVZ George's comments. Spreading people
Hi Frank, Most people incorrectly assume the shield "filters" electric fields, and allows magnetic fields to pass to what they assume is the "antenna" inside the shield. That concept is totally wrong
Hi Robin, OK that makes sense. The moment you say "TU" or whatever you closing sequence is, then all is open. Before that, just be patient shutup and listen. 73, Tom W8JI W8JI@contesting.com
An open shield connection or water in the cable can cause reactance to appear over a wide frequency range. Additional problems are dc or low frequency AC getting into the meter input, or the unit is
Hi Don, That was a well thought-out post but I'd like to clarify one thing: That depends on how you define "enough" and what else you do at the feedpoint. With only three or four radials, there will
That is a common assumption, but almost never true. Unless out-of-band signals or noise are actually overloading the receiver front end or mixers (which would indicate a VERY poor receiver), it will