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Vertical antenna for DX
Peter,
I have heard that vertical antennas are more susceptible to noise! I live in a residential area with a moderate amount of man-made QRN. My antenna "farm" (which is more of a small garden ;-) includes horizontal dipoles for 80 and 160 meters, and verticals on 40, 80 and 160. Using a remote antenna switch, I can quickly select antenna orientation and easily compare signal strength and QRN levels. For signal strength, the horizontals are superior under 500 miles, but after that the verticals kick in and are almost-always better at DX distances. In fact, even IF the signal strength of DX stations were equal on both, the fact that the verticals attenuate the local stations by over 20db is enough of a selling point. For QRN, I think the answer is like real estate: location, location, location. My verticals are at the rear of the property and farthest away from power lines and AC service to the house. The dipoles extend into the front yard and are more susceptible to AC line noise. Although I also expected the verticals to be "noisier", due to locations the dipoles are a little - but barely - noisier than the verticals. Hope this explanation helps, -- -larry K8UT "Peter" wrote in message . au... I'm proposing to build a new multi-band HF antenna. Previously I used simple relatively low (8mtr) dipole (28mtr total length) feed with ladder line and matched with a Z-Match tuner. Worked ok, but was useless for DX. My proposed antenna is to be vertical (7mtr radiator) to be used on bands from 10mtr to 30mtr. I have heard that vertical antennas are more susceptible to noise! I'm keen to hear this groups view on the noise issue and generally how verticals are regarded as a DX antenna. Also keen to hear of personal experiences with vertical antennas on HF. Regards Peter http://members.optushome.com.au/vk6ysf/vk6ysf/main.htm |
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