RX Antenna Flag FO0AAA (Update 29 Mar 2018)

RX Antenna "Flag" FO0AAA (1.8-10 MHz)

Техническое описание

You can buy it here

It is a delta loop-shaped antenna with a 28-foot (8.537m) bottom horizontal wire and the apex 17 feet (5.183m) above the bottom wire. That means there is a total of about 72 feet (21.951m) of wire in the triangular loop. 

The primary reason this design was chosen by the FO0AAA team was that it was an easily-erected and easily-rotated directional receiving antenna. Only one support at the apex is needed (which must be non-metallic). The bottom corners of the antenna can be attached and pulled taut with rope to tent stakes driven into the ground. To change directions, it is a simple matter to relocate the tent stakes to the desired direction and re-attach the corners of the antenna. But this antenna has very small gain, about -30dB on 160m and 80m. I use special preamplifier by DL2KQ [1] on AD8129

PreAmp has
- CMRR > 80 dB
- Input impedance 4 MOhm
- Gain 30 dB
- Output impedance 50 Ohm

UPDATE March 2018

Modification for Double Flag (Like DHDL and TX3A antennas) by DL2KQ. Preamplifier AD8129 with BPF for 160/80 m. Works like Beverage 180m.

Band pass filter (1-4MHz) for 160/80 by RA3WDK.

Here some photos and videos about this antenna

UPDATE 12 August 2016

New PCB design!

NEW! Power feed unit has TX/RX switching for protect preamp during transmitting!

Отзыв UN7ECA:

"На дня установил приемную антенну.

До этого не было времени,то морозы,то еще чего-нибудь.Работает изумительно.Пробовал ее разворачивать,реально есть кардиоида.F/B присутствует,особенно видно на дальних трассах.На 160 метров только не пробовал послушать.80 и 40 метров хорошо.На 30-ти метрах дажечувствуется излишнее усиление,приходиться загрублять прием."

NEW Video Jan 2017

UPDATE Oct.2016

1. AD8129 by DL2KQ  http://dl2kq.de/ant/3-96.htm

2. Double Flag DL2KQ http://dl2kq.de/ant/3-55.htm

3. BPF RA3WDK http://ra3wdk.qrz.ru/LowBandDX.htm