| Parameter | Value | |-----------|-------| | Power | 2x AA alkaline (1.5V each) | | Radio frequency | 60 kHz WWVB (USA) / 77.5 kHz DCF (EU) | | Operating temp | 14°F to 122°F (-10°C to 50°C) | | Accuracy (atomic) | ±1 second per 1 million years | | Accuracy (quartz backup) | ±0.5 sec/day at 25°C | | Dial diameter | 12.6 inches (32 cm) | | Weight (without batteries) | 1.8 lbs (0.82 kg) |
Shows time (hour/minute/second), calendar, day of the week, indoor temperature, outdoor temperature, and signal strength.
The signal is strongest at night. The clock will automatically attempt to scan for the signal, often succeeding overnight. sharp atomic clock spc373 user manual
| Pros | Cons | |------|------| | ✅ Truly set-and-forget once synced | ❌ No manual time setting – useless if atomic signal fails | | ✅ Large, easy-to-read digits | ❌ 12-hour only – no 24-hour mode | | ✅ Auto DST adjustment | ❌ No backlight always-on option | | ✅ Affordable (~$20–$25 USD) | ❌ Flimsy plastic stand (manual advises “gentle handling”) |
Before you begin, place the clock near a window facing Colorado for the best signal reception during the initial sync. | Parameter | Value | |-----------|-------| | Power
Once you’ve set the minutes, press SET one last time to return to the main display. 3. Selecting Your Time Zone
Keep the clock away from electronics like televisions, computers, or microwaves that can cause interference. | Pros | Cons | |------|------| | ✅
Based on user feedback and expert Q&As, here are the most frequent problems with the SPC373 and how to solve them.
(exact labels may vary slightly – typical for Sharp):
A: The sensor takes time to stabilize after battery change (24 hours). Also, ensure the clock is not near a humidifier or bathroom.