Antenna type:                          Terminated loop

Pattern:                                   Cardioid, switched in four directions

Peak front-to-back:                 Greater than 20 dB, typically 30 dB

Feedpoint impedance:             50 ohms nominal; low-loss transformer matching to the antenna

Frequency range:                    Very low frequencies to  8 MHz, using published dimensions. With preamp on, bandpass is limited to 1.8-5 MHz

Direction change:                   Feedpoint/termination switching relays

Direction control:                    Connected with a 6-conductor control cable

RF connection (antenna):       SO-239 (UHF) connectors at control box and outdoor relay box

RF connection (radio):            Phono connector output to receiver external antenna input

Termination Adjustment:         Eight resistances from 340 to 680 ohms, selected by front-panel rotary switch

Power requirements:               +12 to 15 VDC, 400 mA max., (provided by customer, to be fused at 0.5 A)

Preamplifier:                           15 dB gain, feedback type, using a silicon NPN transistor

Filter passband:                      ±2 dB from 1.80 to 4.5 MHz

Filter stopband:                       –55 dB at 7 MHz, –50 dB below 1450 kHz (typical)