16:1 Baluns/Ununs

1031115103 - 16:1 Baluns/Ununs
+3

CABLE TV/Satellite RFI Coax Noise Filter, Suppresses 1-60 MHz common mode interference

CMNF-TV
$69.95
In stock
1
Product Details
MPN: CMNF-TV
Country/Region of Manufacture: United States
Filter Power Rating (PEP watts): receiver only
Choking Impedance (ohms): 1000 - 7000
Common Mode Attenuation (db): 21 - 36 db
RFI Suppression Range (MHz): 200 KHz-30 MHz
Insertion Loss (db): .02
# Ferrite Filters: 3
Enclosure Size (inches): 4" x 2" x 1.5"
Typical Use:: Noise filter at radio end of coax next to receiver

CABLE TV/Satellite RFI Noise Filter for AM broadcast & shortwave from 1-60 MHz – Receive Only - F connector I/O - 75 ohm input/output, will pass DC straight thru

Purpose. The CMNF-TV is used to suppress RFI noise and common mode interference on the coaxial input line of satellite and cable TV receivers often caused by nearby transmitters

The filter is designed to have a high RF impedance to noise and interference from common mode currents on the outside of the coax braid while passing RF signal currents on the center conductor and inside of the coax braid to the antenna.

The effectiveness of the filter is dependent upon the amount of common mode noise encountered on the feed line. If your receive system has a large amount of common mode noise current then you should experience a reduction of common mode current which usually as heard as background noise level. Typical choking impedance is shown in the gallery picture.

Got Common Mode Noise? Not Sure - Find out now by clicking link below:

Palomar Engineers Common Mode Noise on Coax User Diagnosis Test 


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.
Bill
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16:1 Baluns are useful between 750-850 ohm balanced loads where the impedance at the  end of the feed line is 800 ohms (1/2 wavelength feed line), or high impedance feeds for rhombic,  T2FD and traveling wave antennas.

16:1 Ununs are useful between coax and long wires with a load impedance near 800 ohms like a beverage antenna.  Shortwave listener antennas also can benefit with the 16:1 unun and it may provide a better match than 9:1 ununs – this means quieter noise levels and stronger signals so you can hear distance stations easier.