SPECIFICATIONS FOR DQ RECEIVER AND BEACON

SPECIFICATIONS FOR DQ RECEIVER, BEACON, AND LOOPS

DQ Receiver:

22" Receive Loop:

2 lbs of #28 enameled wire (512 turns) with electrostatic shield 450mH, 201 Ohms DC, ~4600pF for resonance, Rres=274,300 ohms, Q=27.75, BW=126Hz, Thermal Noise=66.8nV/1Hz BW, Electric field effective height=.245 mtrs
Loop sensitivity: External magnetic field at noise level=0.723nA/mtr in 1Hz BW and 0.91nA/mtr in the 1.6Hz noise BW of the Receiver
The 18" Loop with 1 lb of wire (350 turns) and no electrostatic shield, 159mH, ~13500pF for resonance. Sensitivity is about 6dB less than the 22" Loop, 1.82nA/mtr in 1.6Hz receiver noise BW.

Beacon:

The magnitude of the beacon’s magnetic field (Magnetic Moment) and the battery current depend on the transmit loop being used with it. Following is data on all of all the loops I have built so far:
¾" dia 12" long ferrite, u~2000, 168 turns #22, tap at 8 turns. This loop requires a minor modification to the beacon circuit.
13"x16.5" rectangular, 26 turns #10 solid, tap at 4 turns
22" dia Wakulla underwater loop, 19 turns #12 solid, tap at 3 turns
24" dia "frameless" loop, 19 turns #12 solid, tap at 3 turns
4 ft 4" dia flexible loop, folding frame, 18 turns #14, tap at 2 turns