This cable is 50 ohm and short 6 inch pigtail double shielded with foil and braid and PL-259 connectors on each end. All the connections inside are soldered and the cable is made of copper conductors with coax having PVC jacket. RG400 is generally useful up to 5000 watts PEP at HF frequencies below 30 MHz. Greater power capability and frequency range than RG-8X, yet similar physical size.
Use for short jumper for Palomar Engineers Noise Filters like CMNF-500-50 or SWR meter, etc.
** Our Customers also used this RG400 Coax in longer sizes to make ham radio common mode chokes up to 5KW PEP
Physical Specifications:
• Inner conductor: Silver Plated Copper, Diameter: 19x0.203mm
• Dielectric/Insulation: PTFE, Diameter: 2.95mm
• Outer Conductor/Double-Shield: silver plated copper double braid , Diameter: 3.95mm
• Jacket: FEP, Diameter: 4.95mm
Electrical Specifications:
• Nom. Capacitance Conductor to Shield: 105 pF/m
• Nom. Characteristic Impedance: 50 Ω(ohm)
• Nom. Velocity of Propagation: 70%
• Min. Bend Radius(Install): 25mm
• Voltage Rating: 1900 VMS
• Max. Operating Frequency: 12400 MHz
• Operating Temperature Rating: -55℃ ～ +200℃
Attenuation:
• 100 MHz : 0.144 dB/m
• 400 MHz : 0.295 dB/m
• 1,000 MHz : 0.482 dB/m
• 5,000 MHz : 1.184 dB/m
• 11,000 MHz : 1.899 dB/m
A simple ferrite ring filter on the DC power line can help suppress the RFI noise affecting the victim device or keep the DC power cord from acting as an antenna and radiating RFI into other victim devices. This kit is also useful on laptop computer supplies, routers, cable modems, wireless phone charges, etc.
Installation is quick and easy: Just wrap the DC power cord through the center of the ring filter as many times as you can and reinstall. For best results with long DC power lines, use one at the ring filter at the wall wart end (to prevent the wall wart power supply from using the DC line as an antenna) and another at the DC plug end (to prevent the electronics in the powered device from using the DC power cord as an antenna). Typical installation is shown below:
The filter suppresses RFI in from .1-100 MHz. Inside diameter is 3/4 inch/19 mm.
Since most households and office environments have multiple wall warts we offer the Wall Wart RFI Filter kit in bulk quantity packages.
Known RFI Generators include Roku/Sling-TV power adapter - Interference heard in the AM broadcast band and harmonics. Also many ethernet Cable/DSL modems, cell phone chargers, computer power adapters have the same issue: using the AC or DC side of the power supply as a radiating antenna. RFI solution is to use a linear power supply, change adapters or wall wart ferrite filters