This is a special version of the 807 antenna, specifically designed for traveling hams requiring a medium power all-band antenna "as lightweight as possible."
This first unit was built specifically for the
February 2018 DX-pedition to Gambia (C5DX).
See QRZ.com for more details.
This version is identical to the Model 807-L, except it has no plastic enclosure for the balun, sparing not only the weight of the case but also the weight of the epoxy potting inside of the case.
Instead, the balun is built onto a piece of 2mm thick epoxy board (FR4) with all of the excess fat removed. (see picture)
NOTE: THERE ARE NO PLANS TO SELL THIS VERSION.
The balun is unique and critical to the performance of this antenna. It is a hybrid design, created by DJ0IP after 2 years of intensive research into the 80m OCFD antenna.
The two Ferroxcube Toroids are coated with a thin layer of Epoxy, making them weather-proof. The coax as well as Teflon-Insulated Twisted Pair wire of the top Balun are also weather-proof.
The solder connections are coated with RED fingernail polish. The color of red was chosen instead of clear polish, to enable seeing how well it covers the connections. Fingernail polish was used because it can be easily removed with nail polish remover...in case a repair is ever necessary.
The RMU is also unique in that it enables field swapping for RMU's with more or less capacitance to lower or raise the frequency of minimum SWR.
The entire antenna is unique in that it is actually two antennas in one.
By removing the RMU and the wire beyond it, the remaining antenna becomes a 40m OCFD and is usable on 7 bands (40/20/17/15/12/10/6m).