[South Florida DX Association] JPS ANC-4 Antenna Noise Canceller and Diversity Combiner

[Michael Raskin]

JPS ANC-4 Antenna Noise Canceller and Diversity Combiner
The ANC-4 was originally developed by JPS, but is now being manufactured 
exclusively by Timewave. It is an RF device designed to provide cancellation 
of locally generated noise from signals received by a primary antenna. 
Check it out at http://www.timewave.com/

The unit is employed right at the antenna connector of the receiver to 
cancel noise from power lines, computers, TVs or nearby equipment. This 
device cancels locally generated noise before it reaches the receiver or 
transceiver. Front panel controls are provided to allow adjustment of both 
phase and magnitude of the local interference, providing extremely deep 
cancellation of the offending noise.

The ANC-4 is an rf device that eliminates or reduces power line noise, BPL 
noise, computer noise, TV-generated interference, and other types of 
electrical noise. The ANC-4 unit connects right to the antenna connector of 
the receiver or transceiver to cancel locally generated noise before it gets 
into the receiver and affects the receiver AGC circuits. Reception of 
signals well below the noise level of the local interference is possible. To 
cancel locally generated interference, the ANC-4 detects the interfering 
signal and adjusts its phase and magnitude so that it matches the offending 
interference at the receiver input, but is 180 degrees out of phase, 
effectively cancelling the interference. This scheme is particularly 
effective at reducing local power line noise or other locally generated 
noise types.Front panel controls allow adjustment of both the phase and 
magnitude of the local interference, providing extremely deep cancellation 
of the offending interference.The ANC-4 connects between the main station 
antenna and the receiver antenna connector. A second antenna connects to the 
ANC-4 to act as a noise pickup antenna. A short wire antenna or a short 
collapsible whip is generally satisfactory for eliminating noises generated 
around the operating position or in the house, but an external antenna 
usually works better to eliminate noises generated outside the home. Any 
noise antenna that works, including combinations of horizontal and 
vertically polarized antennas, is satisfactory.The ANC-4 operates as an 
active antenna by using the noise antenna and the NOISE GAIN control to 
amplify the antenna output. The unit can also be used as a diversity 
combiner to peak weak signals or null interfering signals.

In excellent condition with original manual.   $145 plus shipping.

Mike, W4UM (ex-K4KUZ)
South Florida DX Association - www.qsl.net/k4fk
Mid Florida DX Association - www.w4fdx.com
Florida Contest Group - www.floridacontestgroup.org