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244 [2007/02/28 11:50]
n5na
244 [2007/05/20 20:41] (current)
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 Plugs into the accessory socket of the Model [[540]].  Six digits show actual transmitted and received frequencies to hundreds of Hertz.  The VFO output frequency, which is 9 MHz away from the operating frequency, is counted and a 9 MHz preset is either added to or subtracted from the count by means of the front panel mode switch, thus eliminating all VFO crystal tolerance errors.  The 9 MHz oscillator tolerance error is eliminated by setting the time base gating oscillator to WWV.  A COUNT position on the mode switch permits using the 244 as a straight 50 kHz to 22 MHz frequency counter.  Includes cable.  Housed in matching enclosure. Plugs into the accessory socket of the Model [[540]].  Six digits show actual transmitted and received frequencies to hundreds of Hertz.  The VFO output frequency, which is 9 MHz away from the operating frequency, is counted and a 9 MHz preset is either added to or subtracted from the count by means of the front panel mode switch, thus eliminating all VFO crystal tolerance errors.  The 9 MHz oscillator tolerance error is eliminated by setting the time base gating oscillator to WWV.  A COUNT position on the mode switch permits using the 244 as a straight 50 kHz to 22 MHz frequency counter.  Includes cable.  Housed in matching enclosure.
  
 +===== Specifications ===== 
 +  ***Resolution:** 6 digits; least significant reads hundreds of Hertz. 
 +  ***Digit Size:** 0.4". 
 +  ***Digit Color:** MHz and kHz digits red; hundreds of Hertz digit green. 
 +  ***Input Voltage:** 75 mV min. 1 - 25 MHz, rising to 50 mV @ 50 kHz. 
 +  ***Frequency Range:** 500 kHz to 22 MHz, min. 
 +  ***Panel Controls:** 5 pos. MODE Switch (OFF, 1.8-2, 3.5-7.5, 14-30, COUNT) 
 +  ***Semiconductors:** 1 LSI, 6 ICs, 20 transistors, 9 diodes. 
 +  ***Power Required:** Provided by 540/544 transceivers (required 12-15 VDC @ 500 mA max). 
 +  ***Size:** HWD 2.5" x 10.375" x 6.5". 
 +  ***Weight:** 1 lb., 14 oz. 
 +