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KD1JV Digital Dial
The Digital Dial is primarily intended to be used as a simple means of adding
a digital frequency read out to single band QRP radios. A programmable IF
offset feature allows the counter to measure the VFO frequency but display the
actual operating frequency. The digital dial can also be used as a general
purpose frequency counter. It also includes a special "crystal matching" mode,
which allows the matching of crystals used in IF filters to within 10 Hz of each other.
- Frequency range: 100 kHz to 45 MHz
- Resolution: 100 Hz
- Update rate: 100 ms
- Input level: 50 mv p-p min, 2 V p-p max. (sensitivity varies with freq) Input impedance: 1 Mega ohm.
- Display, four digit LED
- Supply voltage: 8 V min, 14 V max
- Supply current: 37 ma, typical
- Size: 2.1" wide, 1.1" high, 0.5" deep
Comparison of Digital Dials and Frequency Counters
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Notes:
Each kit was assembled and calibrated per the manufacturer's instructions.
The sensitivity of each assembled digital dial was measured using a calibrated HP 8640B RF Generator and verified with a HP 8660C.
The Chinese Ebay digital dial, sensitivity could not be measured with the equipment used so a pre-amp was added.
Supporting Files and Documents
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Digital Dial Assembly Manual (Current ver B)
Digital Dial Assembly Manual (older ver 1)
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