Welcome to Tropical band

To most people the phrase "tropical bands" bring a pretty clear picture to mind - a bunch of shirtless guys playing calypso music. But to experienced shortwave DXers those two little words express the most challenging and enjoyable part of the radio hobby. The phrase kindles memories of a DXer's best catches and favorite QSLs, of exotic stations, music and of early morning listening sessions. (Don Moore)
I like the "Tropical band" name for new 60m allocation. (OK1RP)

Effective from 1st Jan 2017 please paper QSL via OM-bureau only.

Sunday, July 31, 2011

60m RSBEV vertical by Lou, KE4UYP

60m band RSBEV vertical antenna

(Orig. design and article by Lou, KE4UYP)

A 60m full-size elevated ground radial vertical would be 52 feet high with the ground radials at 8ft. above ground. It would require a square piece of land 104 feet by 104 feet on the ground. It also would have a limited range of take off angles. This greatly reduces its performance under 1000 miles.

Here is a radical new design for a wire vertical antenna it is a true self-contained vertical that is reduced size but still has high performance. At a top height of 29ft. 2"3/4 . A horizontal space at the top of 24ft. 9"1/2 and 20ft 2"1/2 by 26ft 2"1/2 at the bottom. My RSBEV's (Reduced Size Broad Elevation Verticals) have an unusually broad elevation pattern this improves short range communication quite dramatically. The elevation pattern covers from 9.8 degrees to 69.6 degrees minus 3 dB that is a total range of 59.8 degrees.

Compare that to the 60m full-size elevated ground radial vertical that only covers from 8.3 degrees to 47.3 degrees for a total range of 39.0 degrees.

But what about the gain difference well the elevated ground radial vertical
over average ground has 0.19 DBi at 25 degrees at 10 degrees it is -1.63 DBi. The RSBEV has -0.75 DBi at 30 degrees that is only 0.94 DB less than the elevated ground radial vertical. At 10 degrees it is -3.75 DBi just 2.12 DBi less.

Now for the icing on the cake the RSBEV is a direct 50 ohm coax fed antenna, with a usable band width of more than 200khz.

There is always room for improvement wire verticals have been around for decades but I believe my new design is a improvement over traditional monopole verticals.

29ft. 2"3/4 High at top
Wire 1 This Wire go's from 29ft.2"3/4 down to 5ft.1" above ground
Wire 2=20ft 2"1/2 This Wire go's from 5ft.1" down to 3ft. above ground
Wire 3&5=26ft 2"1/2 Stays at 3ft. above ground
Wire 4=24ft. 9"1/2


As it is very interesting design I am posting it over here with permission of Lou, KE4UYP. It will be very useful to know if somebody tried it and with which results...

More information You can find here:

73 - Petr, OK1RP

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