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W3NQN AC Line Filters

 

 

 

 

 

 

 

 

 

 

 

                                                               

The NQN 7-amp AC line filter was developed for high-level RF interference environments, where computer and monitor power-line noise causes a problem with sensitive receivers, as well as with critical listening and recording environments such as high-end audio studios, home theaters, and audiophile stereo systems.

The NQN AC line filter is especially effective in eliminating the high-level AC line noise generated by the six or more computer/monitor systems used by amateur radio operators during multi-multi contesting. Also noise sources such as wall-wart generated RFI is a serious station problem.  To address this issue the AC-7 can be supplied with an optional IEC-to-NEMA adapter so wall-warts and other equipment may be plugged into it.  See Price list to purchase this option.

The NQN AC line filter features the following:

  1. Line cord radiation is minimized by using a three-wire power line cord having a foil shield and a drain wire.
  2. Nine (9) capacitors are used  and are all AC-rated Class Y2 or Class X2.
  3. Four 52 uH Powdered iron toroidal cores (two per line) provide optimum power-line differential-mode filtering and are rated for a maximum line current of 7 amperes.
  4. The foil shields and third-wire ground are maintained via the filter's aluminum case from the IEC female receptacle to the NEMA three-prong male AC plug.
  5. The 115-VAC leakage current measured through a 1,500 ohm resistor from the filter case to ground is less than 1.4 milli-ampere.
  6. The voltage drop between the filter input and output at a load current of seven amperes is about 1 volt which is less than a 1% drop in the 115-VAC input line voltage.
  7. A three-prong female-to-two-prong-male adapter "cheater" is included if you need to break the shield ground at your 115 VAC power receptacle to eliminate a ground loop via the shield.
  8. The cover is secured to the aluminum case with four 4-40 machine screws into four 4-40 captive nuts that are press fit into the case body.  This eliminates the possibility of stripping of the threads if sheet metal screws had been used.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

                                                             
                                 W3NQN AC Line filter - inside view.

Compare this with a Brand "C" filter which only handles common-mode interference problems.  The NQN AC power-line filters are optimized for common-mode and differential-mode filtering and have about 3 times the components of brand "C".  Plus they are all rated for this type of duty.  If you compare the size of cores and windings of other filters we think you will agree the NQN AC-7 power-line filters are of the highest quality.  

Engineering that makes a difference in the station.  

Several progressive contest stations have already converted to the NQN AC power-line filters to eliminate the computer generated noise.  Shouldn't you?  If you have my SixPak which can isolate down to 85 db between stations, you will benefit from getting rid of the PC and monitor trash.  The next thing you need to do is replace all your RF cables with double shielded RG142 to achieve that next level of receiver "quietness".

 

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