April 2, 2023
Using an external Automatic Noise Canceller on your HF radio.
The unit we are going to be covering tonight is the Timewave ANC-4, which has been in my station for about 12 years.
This Antenna Noise Canceller is made by Timewave Technology , Inc.
What this unit can do:
* Cancels S9 line noise floor
* Reduces BPL noise
* Nulls out strong interfering signals
* Eliminates noise before it reaches your receiver
* Up to 40db reduction of interference generated by power lines, electric motors, TV’s and other sources.
* Wipes out noise before it gets to your receiver front end
SPECIFICATIONS
Operating frequency range – 500Khz to 80Mhz
Maximum transmit power thru unit – 250 watts
Average time to switch to Bypass when Transmit RF detected – 7 ms, typical
Typical insertion loss – approximately 6db
Noise cancellation – 40db or greater
Operating voltages – +11 Vdc to +16 Vdc @ 150 ma.
Dimensions – 1.7″H x 6″W x 4.3″D
How it works:
The interfering signal needs to be received by the external sensing antenna.
It’s phase and magnitude are then adjusted so that it matches the offending interference, but is 180 degrees out of phase, effectively cancelling out the interference, allowing the weaker radio signals to be heard.
This is particularly effective at reducing local power line noise or other locally generated noises.
A short telescoping antenna on the sensing port will be effective on any noise being generated inside the house, like a nearby computer.
If the noise is coming from a source outside the house, then the external noise antenna port should be connected to an outside antenna.
What else can it do?
The ANC-4 can also be used as an ACTIVE ANTENNA.
Connect a long wire to the Noise antenna port and adjust the NOISE GAIN control to provide amplification of received signals.
To use it as an Active Antenna, no antenna should be connected to the Main antenna jack.
