Re: Topband: 2 wire reversible Beverage
Hi Fred, Might be you can get some ideas from http://dxmaps.com/safontbeverage.html and http://dxmaps.com/safontbeverage2.html 73. Gabriel – EA6VQ -Mensaje original- De: Topband [mailto:topband-bounces+ea6vq_ml=dxmaps@contesting.com] En nombre de Fred Moeves Enviado el: viernes, 8 de mayo de 2020 20:04 Para: topband@contesting.com Asunto: Topband: 2 wire reversible Beverage Getting ready to put up a 2 wire reversible Beverage and I have a few questions and looking for some ideas… Sorry I’m sure this subject has been beat to death… I did some searches but didn’t find what I was looking for. My understanding is the wires need to be in the horizontal plane to keep everything balanced. Also I am assuming I can use THHN wire and twist it together and then put both wires on one insulator. Or another way would put insulators on the side of trees and separate them by a couple of inches…like ladder line. Just wondering which way would be easiest to build and give the best performance? To me it would seem to easier to put 2 wires together on just one insulator. I will be installing this on the trees in a heavily wooded area. It seems building the antenna with 2 wires and keeping them parallel and same distance from the ground will not be easy. Thanks Fred KB4QZH _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Topband: Inverted L with elevated radials for topband
I have some doubts about installing and inverted L with elevated radials for 160m. I have been searching in Google and find some contradictory information, so I would appreciate very much if you can help me with your own experience. The antenna would be supported by a 16 m (52.5 ft) high fiberglass pole placed on top of a 3m (10 ft) high small tower with the horizontal part of the L slopping down to a 5 m (16 ft) high mast about 23 m (75 ft) away. Two to four tuned elevated radials can be placed, although they will have to be bent due to space restrictions. Now the doubts: What impedance can I expect at the feed point with this configuration? How to match it in order to feed it with a 50 ohm cable? Some pages say that no match is required, only a choke. Other pages say a hairpin is necessary as the impedance can be too low. So other say that a tuner at the base is required?I am confused L What performance for DX can be achieved by this antenna? Is it really good or do you have some better suggestion for a really small lot where no ground radials are possible? Would it be worth to use a higher fiberglass pole, let's say 4 m (13 ft) higher, in order to lengthen the vertical section of the L? Would the difference be noticeable? Anyone has real experience setting up this antenna with elevated radials? Most information I can find on Internet is related to ground mounted antennas. Thanks in advance! 73. Gabriel - EA6VQ _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Topband: Beverage in a slope
I am planning to install a second 180m (590 feet) long reversible Beverage in the next months to cover the NW-SE directions, but due to terrain restrictions of my property it will have to be installed in a slope. The feed would be near the top of hill and the Beverage would slope down, being the far end about 50m (160 feet) lower than the feed point. Anyone has experience with a similar setup and how much it could affect the performance of the antenna? I assume that the vertical lobe will be affected somehow, but... 73. Gabriel - EA6VQ _ Topband Reflector Archives - http://www.contesting.com/_topband
Topband: RX / TX antenna switching
I will appreciate your advice in the best (but simple) way to switch between RX and TX antennas for a transceiver that does not have a separate RX antenna input. The system should be able to switch from RX antenna to TX antenna when PTT is applied (and vice versa) but also allow to switch between the two antennas during reception in order to compare. I have thought about using a coax relay as I do switch the VHF preamps, but I think it's switching will possibly too slow and some RF could flow to the RX antenna, causing damage. Any ideas will be welcome! 73. Gabriel – EA6VQ _ Topband Reflector Archives - http://www.contesting.com/_topband
Topband: Opinions on BevFlex-4
Hi, Anyone using the BevFlex-4 antenna (or the former version, the BevPro.1) could share his impressions? I am thinking of setting up one (possibly two in the future) for testing RX on 160m (and possibly 80, 60 and 40m too) in the Beverage configuration. Having the house in the middle of my property this antenna would make me easier the installation compared to a standard Beverage as the feed point does not need to be at the end of the antenna. 73. Gabriel - EA6VQ _ Topband Reflector Archives - http://www.contesting.com/_topband
