Differences
This shows you the differences between two versions of the page.
|
244 [2007/02/28 16:56] n5na |
244 [2007/05/21 00:41] |
||
|---|---|---|---|
| Line 1: | Line 1: | ||
| - | ====== Digital Readout Model 244 ====== | ||
| - | {{244.jpg?150|}} | ||
| - | ===== Description ===== | ||
| - | 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. | ||
| - | | ||
