Comments interspersed in the text below: far get Stacking LP's is a problem because the spacing is only going to be optimal on one band. It can be done with decent results, but not like stacking a pa
Together with Jim, SM2EKM I have recently done some testing of f/b on my stack of TH7DX's. The f/b on the single TH7DX tribander over a wide frequency range is essentially the same. The difference ov
Gentlemen, Measuring the F/B of any HF antenna in the E-Plane only, is at best a guess. The only true way to know the real F/B is measuring it in the H-Plane, and there is the problem. Not many can p
E-Plane only, is measuring it I'll second that comment. The worse possible way to measure horizontally polarized HF or lower frequency antennas is at large distances over earth. The longer the dista
E-Plane only, is measuring it I'll second that comment. The worse possible way to measure horizontally polarized HF or lower frequency antennas is at large distances over earth. The longer the distan
evaluate a more generally, as you rotate Ground effects are attenuating or nulling ANY horizontal signal following the earth. The worse possible way to measure anything is in the null, because small
I have done some measurements of skywave patterns with some success by integrating a number of readings over time for each azimuth setting. I have a little software utility I wrote that facilitates t
The thing that I was trying to convey with the measurements we made was that the TH7DX tribanders are not critical in f/b vs frequency in contrast to what someone suggested. What the precise f/b numb
At 03:44 AM 6/26/2004, Peter Sundberg wrote: So f/b on groundwave is important and so far, from what I have seen the results are pretty close to what the software model tells you. But again, in preci
have seen the you. > affect groundwave were the pointing a pretty good Something either is a good method, or it isn't. Not being good doesn't mean every case won't work nor does it mean most cases w
Good points Tom, thanks. Just one comment regarding paragraph 2 where you say that there is a 'filter' that often has more attenuation of horizontally polarized signals than vertically polarized. I h
Perhaps an inexpensive approach (instead of something like SRI's RELEDOP), albeit time consuming, would be to hook up something that monitors the NCDXF beacons around the world. Monitor for quite som
I posted a message a couple of days ago in this thread regarding a similar thing I did using a software utility I wrote to automatically rotate and integrate multiple passes of S-Meter readings and p
I see that our posts crossed in the mail, as it were. I was at FD for the last couple days so I was working of the 200 or so emails. the 20 minute averaging interval could be done with the beacons, i
Jim, I'm not that familiar with the beacons, but since your post I did a little research. There are a couple of major problems. First, the transmissions are very short... there wouldn't be time for m
At 02:08 AM 6/28/2004, Larry Phipps wrote: Jim, I'm not that familiar with the beacons, but since your post I did a little research. There are a couple of major problems. First, the transmissions are
Why not leave the power constant and use a switchable attenuator to keep the s-meter constant? That would seem to give more accurate and more repeatable readings. N2TK, Tony Frankly, I think these ar
At 07:27 AM 6/28/2004, N2TK wrote: Why not leave the power constant and use a switchable attenuator to keep the s-meter constant? That would seem to give more accurate and more repeatable readings. S
If you use the TRX-Meter utility to do your automatic plotting, it allows for precise calibration of the S-Meter against a standard. You just need a signal source and step attenuator to do the relati
Hi Peter, there is a polarized signals of EME and on both for 144 and a switch polarization Soil absorption is so bad at VHF that the earth looks pretty poor for any polarization. As frequency is dec