[Premium-Rx] Wellbrook Loop antennas

[Nicholas Hall-Patch]

Hello Mac,

The earlier Wellbrook loop interfaces did indeed use negative polarity
center pin power supplies.   The later ones use positive pin polarity.

If you have an earlier loop interface,, and it has worked with negative pin
polarity in the past, then all is well.  If you need to replace the supply,
Jameco Electronics can sell you a linear regulated negative polarity supply.

best wishes,

Nick

****************

Question about using my Wellbrook antenna,  does anyone know the DC input
polarity for the amplifier box, This is the box that takes the input signal
directly from the actual loop does the amplifier magic then sends the
signal on to the receiver's typically 50 ohm antenna input.

For reasons that shall not be explained I have noticed the power supply
[wall wart] and i doubt it is the original supplied unit Wellbrook sent or
included, has reverse polarity wherein the center pin is - Negative and the
body is + positive.

While Wellbrook is British made I am just unsure if the amplifier box is
indeed reverse input from what is now the more industry standard of center
pin positive and body negative and I can find no documentation detailing
the desired input, so I am asking the group for experience or factual
schematic..

Thank you in advance.

mac/mc  w5mc