Re: Topband: Twin Sloper
I have a modified Alpha Delta sloper..well it started out as an Alpha Delta mounted at 70 feet on my 86 foot tower. I jumpered the loading coil and lengthened the 40/160m wire to 130 feet or so. I now have 5 sloper wires. Two are for 160, two are for 80m and one is for 60m. I run it without a tuner on 1.8 - 1.92 with an swr of 1:1.8 over that range. It covers 3.5 to 3.85 with under 1.8:1. It will also load easily with a tuner on 30m. No tuner is needed on 60m It did work on 40m until I added the second 160m wire and then I just increased the 40m wire to cover 60m instead. There is some interaction going on which I never really investigated To get it to work on 160 without a tuner, I had to add a 140 foot counterpoise wire which is connected to the tower leg at 70 feet where the feed coax is attached. This wire then slopes out in the opposite direction of the two 160m wires. This sloper has worked very well for me. Give it a try. It worked Amsterdam Island on 160 73 Mark N1UK On 08-Jul-21 4:39 PM, Edward via Topband wrote: I have a 30' roof tower on my 25' roof. Have considered the Alpha Delta DX-A which constitutes two sloping wires: one is 67' and the other is 60' fed with coax at the top of the tower with top loading derived from yagis. Rather than to buy one, was thinking of having the same two lengths of wires, fed through a remote tuner at the same feed point (top of tower). The tower is 55' above ground and is grounded via a downlead to a stake. Will this perform roughly the same as the Alpha Delta? Thx and 73, Ed 7Z1ES _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: Beverage directivity
Hi Karl, yes CMCs are easy and should be installed regardless. Even if they dont help with 40/80, they will likely help on 160. Thanks for describing your experience. Regards , Kenny K2KW > On Jul 14, 2021, at 4:24 PM, Richard Karlquist wrote: > > > When I had beverages up (all 400 feet long), they have moderate directivity > on 160, but worked better on 80, and were outstanding on 40 meters, such as > long path to Europe. This would tend to confirm that your 40 and 80 meter > wires are killing the 160 meter directivity. BTW, it is entirely possible > that what is doing the damage is the *feedlines* for said antennas, not > necessarily the antennas themselves. Time for K9YC common mode chokes? > > --- > Rick Karlquist > N6RK > > >> On 2021-07-14 10:10, Kenny Silverman wrote: >> >> Most if not all replies were off line, and thanks to all who wrote in. 2 key >> ideas came out: >> 1) try and reduce the height of the leads at each end of the beverage. But >> they are not exceptionally high so I don't think that's it >> 2) the other is the beverages go under the 80m wire yagi and the 40m >> inverted V. Those antennas are almost certainly killing the beverage >> patterns on 40/80 and the only solution is to detune the 40/80 antennas when >> not transmitting. That may be an issue when I finally get around to >> porting the Rx antennas to both of the SO2R radios. Luckily they work on >> 160 which is the real need. I will have to see about getting another 80m Rx >> antenna for domestic summer contesting >> >> A map of my antennas is now on the bottom of my www.qrz.com/dB/K2KW page. >> >> Regards , Kenny K2KW >> >>> On Jul 12, 2021, at 11:16 AM, Kenny Silverman wrote: >>> >>> Last winter I installed 3 single-wire beverages: >>> 625' to EU >>> 625' to Carib/SA >>> 450' to west coast >>> >>> On 160 the directivity is great, but it's poor on 80/40. Any thoughts on >>> why? I don't have CMC's on them, could that be the issue? >>> >>> Regards , Kenny K2KW >> _ >> Searchable Archives: http://www.contesting.com/_topband - Topband Reflector >> _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: Beverage directivity
When I had beverages up (all 400 feet long), they have moderate directivity on 160, but worked better on 80, and were outstanding on 40 meters, such as long path to Europe. This would tend to confirm that your 40 and 80 meter wires are killing the 160 meter directivity. BTW, it is entirely possible that what is doing the damage is the *feedlines* for said antennas, not necessarily the antennas themselves. Time for K9YC common mode chokes? --- Rick Karlquist N6RK On 2021-07-14 10:10, Kenny Silverman wrote: > Most if not all replies were off line, and thanks to all who wrote in. 2 key > ideas came out: > 1) try and reduce the height of the leads at each end of the beverage. But > they are not exceptionally high so I don't think that's it > 2) the other is the beverages go under the 80m wire yagi and the 40m inverted > V. Those antennas are almost certainly killing the beverage patterns on > 40/80 and the only solution is to detune the 40/80 antennas when not > transmitting. That may be an issue when I finally get around to porting the > Rx antennas to both of the SO2R radios. Luckily they work on 160 which is > the real need. I will have to see about getting another 80m Rx antenna for > domestic summer contesting > > A map of my antennas is now on the bottom of my www.qrz.com/dB/K2KW [1] page. > > Regards , Kenny K2KW > >> On Jul 12, 2021, at 11:16 AM, Kenny Silverman wrote: >> >> Last winter I installed 3 single-wire beverages: >> 625' to EU >> 625' to Carib/SA >> 450' to west coast >> >> On 160 the directivity is great, but it's poor on 80/40. Any thoughts on >> why? I don't have CMC's on them, could that be the issue? >> >> Regards , Kenny K2KW > _ > Searchable Archives: http://www.contesting.com/_topband - Topband Reflector Links: -- [1] http://www.qrz.com/dB/K2KW _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
Re: Topband: Beverage directivity
Most if not all replies were off line, and thanks to all who wrote in. 2 key ideas came out: 1) try and reduce the height of the leads at each end of the beverage. But they are not exceptionally high so I don’t think that’s it 2) the other is the beverages go under the 80m wire yagi and the 40m inverted V. Those antennas are almost certainly killing the beverage patterns on 40/80 and the only solution is to detune the 40/80 antennas when not transmitting. That may be an issue when I finally get around to porting the Rx antennas to both of the SO2R radios. Luckily they work on 160 which is the real need. I will have to see about getting another 80m Rx antenna for domestic summer contesting A map of my antennas is now on the bottom of my www.qrz.com/dB/K2KW page. Regards , Kenny K2KW > On Jul 12, 2021, at 11:16 AM, Kenny Silverman wrote: > > Last winter I installed 3 single-wire beverages: > 625’ to EU > 625’ to Carib/SA > 450’ to west coast > > On 160 the directivity is great, but it’s poor on 80/40. Any thoughts on why? > I don’t have CMC’s on them, could that be the issue? > > Regards , Kenny K2KW _ Searchable Archives: http://www.contesting.com/_topband - Topband Reflector
