SWL Magnetic Longwire Balun

Magnetic Longwire Transformers

SWL Receiver Noise Reduction

Do you have high noise levels on your shortwave receiver?  Much of this noise is common mode noise picked up on your coaxial feed line from electronic devices in your home or from the neighborhood.  Much of this “noise” can be suppressed with a common mode noise filter for coax lines.  For SWL’s the most popular is the CMNF-6 available with SO-239, F or BNC connectors and simply plugs in line with your coax next to your receiver.

See picture below for product examples or click on COMMON MODE NOISE FILTERS for more info.

CMNF-6 Graph and product

Typical user comment:

The filter was quite effective. Was surprised that it actually reduced the noise level
more than the signal so S+N/N improved by 1.9 S units.