DHADI: Digital HF Antenna - Horizontal Double Dipole

Main application of the digital horizontal double HF dipole is NVIS (Near-Vertical Incidence Skywave) reception.

DHADI HF Double Horizontal Dipole Head on 6m Mast (prototype)

The picture shows the self-calibrating double HF head preamplifier with rods, a not-shown 2-input SYDRE digital receiver is on ground. Each single dipole has its coaxial and control cables. Electronic preamplifiers and coaxial cables are compensated (equalized) after auto-calibration.
Each single dipole is channelized and equalized, the time-sampled output data are sent separately through ethernet multicast. If required, the quadrature combination (A+jB or A-jB) for omnidirectionality and/or horizontal circular polarization selection for NVIS is done numerically at user level.
In nominal configuration, channelization provides 2x 1515 consecutive channels of 8 kHz bandwidth complex signals (2x 12.12 MHz total bandwidth), each sampled at 10 kHz. Default usable band is then 1.8-13.9 MHz.
Synchronization through SyncNet enables integration in arrays, DHAMO digital monopoles or SYDRE digital receivers connected to 3rd party antennas can be merged in the array, allowing for example polarization diversity.
At least 2 fibers are required for use in array configuration (SyncNet & 10G ethernet), 2 more fibers can be used for redundancy. Of course, the antenna can be used alone, without SyncNet (internal OCXO's timebase used then).
A minimal 48VDC and maximal 60VDC (for line losses account) power supply is required. Typical power consumption is temperature-dependant, typically 80-100W.