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fr4 [2007/05/20 20:44] (current)
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 +====== CW Filter Model FR4 ======
 +{{fr-4.jpg?​150|}}
  
 +===== Description =====
 +The FR4 filter is for use between receivers or transceivers,​ and high impedance headphones. ​ It is a passive audio filter centered around 850 Hz.  A switch is included to completely remove the filter from the headphone line for phone reception.
 +
 +===== Specifications =====
 +  ***Center Frequency:​** 850 Hz
 +  ***Bandwidth at 6 dB Down:** 400 Hz
 +  ***Bandwidth at 60 dB Down:** 2.4 KHz
 +  ***Input Impedance:​** 2000 ohms
 +  ***Output Impedance:​** 2000 ohms
 +  ***Insertion Loss:** Less than 3 dB
 +  ***Size:** HWD 2-1/2" x 4-3/4" x 6"
 +  ***Shipping Weight:** 1 lb 12 oz
 +  ***Finish:​** Baked enamel case, molded plastic side panels with wood grain inserts

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