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244 [2007/02/21 23:49] n5na |
244 [2007/02/28 16:56] n5na |
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| ===== Description ===== | ===== Description ===== | ||
| - | Plugs into the accessory socket of the Model [[540]]. Six digits show transmitted and received frequencies to hundreds of Hertz. Can be checked and calibrated to WWV. COUNT switch position converts unit to straight 50 kHz to 22 MHz counter for other use. 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. |
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| + | ===== 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. | ||
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