resistors. Id guesstimate the general F/B to be over 20dB on 160. My feeling is that performance could not be duplicated by various other loading methods. If somebody wants to make real world compari
If I wanted to measure the radial and feedline AC current, not having any RF ammeters, I might just take a #47 lamp or other small pilot lamp and stick it in series with the radial and transmit into
I recently built a dipole for 40/20/15 using 300 ohm twinlead, which worked out very well, so I'm thinking of using a similar approach for this antenna, using the full length for 160, and trimming on
While some people do hear much better than they receive all the time in all directions, and are a waste of transmitter power, the issue often involves more than just power levels. Any analysis is fla
When using a Ameritron remote antenna switch with SO-239 fittings, does anyone know a supplier for female F fitting to PL-259 adaptor ? Thanks, 73 Bruce-K1FZ Bruce, IMO, you have the wrong switch. A
To expand a little on Carl's explanation, the ionosphere is not as isotropy as we commonly imagine - in that it is not a nice smooth balloon shaped surface to bounce a signal off of. Instead, there a
It is a known that the ionosphere is not a perfect sphere. It is always moving and it is lumpy and tilted. Together these occurrences can cause focusing and defocusing of the wave due to deformities
Reference to my email, I did not state I had an Ameritron. In fact I have no remotely switched receiving antennas. All receive antennas are switched in the shack. Come to my QTH and walk the field an
...and that loss of the DX window is sadly, dear readers, why you will seldom hear DX stations outside of Europe and North America CQing on 160m in the CQ contests. Bit of a shame really, but that's
Here some interesting paper about LF MF polarization http://www.ann-geophys.net/22/1705/2004/angeo-22-1705-2004.pdf This paper, High-latitude propagation studies using a meridional chain of LF/MF/HF
I had this happen many times as well but it is especially annoying near the end of the contest when seeking to find those last few contacts that I heard fellows calling CQ and only sending their call
So there is confused information about DX windows and digital windows and callig windows and useless windows. Once upon a time there was something called "gentlemen's agreements" and the "DX window"
Here's some things to think about when we think we know polarization or polarization tilt, or non-reciprocal propagation or paths: 1.) When receiving, antenna response to the desired signal compared
I stand by my suggestion and I don't see my suggestion as nonsense in the least. Go here and read section 6.1 http://www.arrl.org/160-meter - The ARRL who host this contest state plainly that this se
As Peter has responded, there are two JA windows; 1810-1825 and 1907.7-1912.5 . Until a few years ago the JA hams only had the upper 1907.7-1912.5 allocation. Because the band was segmented in much o
is disingenuous. First the contest planners have already turned their back on DX. DX was included as an after thought. Why, because 160 meter legend DX-er W0NWX-W0DX-VP2VI was ARRL President and live
My 160 meter shunt fed tower project is essentially done. However, I have an issue with the 80 meter antennas hung off that tower. In a nutshell, the current baluns (ferrite beads) feeding these ante
Right. 5K Ohms is a good rule of thumb for choking Z to prevent noise coupling from feedline to antenna, and if the antenna is reasonably close to balance, is also enough from the point of view of di
Sent: Thursday, December 06, 2012 4:59 PM TBDC comes very close to being just that. You get credit for distances and a nice boost for not being a QRO alligator. I think that this is steadily gaining
That's pretty close. It's a 110 foot tower, with a 4 element 40 (linear loaded) on top, and a KT-36XA at 75 feet. These two antennas have their feedlines isolated from the tower, and the feed methods