Amateur radio
Fumei DG-503 3.5" Digital SWR/Watt Meter — HF/VHF/UHF 1–200W
Product description
The DG-503 is built around a 3.5-inch LCD that displays forward power, reflected power and VSWR with a single button press to toggle measurement modes. Its front-panel layout groups inputs, outputs and controls so switching between bands and reading measurements is straightforward.
Electrical coverage is split into HF (1.6–60 MHz) and VHF/UHF (125–525 MHz) bands. Calibration checkpoints are provided at 14, 50, 145 and 435 MHz. The meter accepts up to 200 watts peak, expects a 50-ohm system impedance, and uses SO-239 coax connectors for antenna and radio connections. Claimed average accuracy is ±5% and insertion loss is under 0.3 dB.
External power is required: the package includes a 12V DC cable but no separate AC adapter or internal batteries. Physical dimensions are approximately 140 × 84 × 122 mm (W×H×D) and the unit weighs about 750 g.
What's in the box: one DG-503 digital SWR/watt meter, an instruction manual, and a 12V DC lead. If different connector adapters are needed for your radio or antenna, the seller can supply and ship them together on request.
Typical use is in-line between a transceiver and feedline to verify transmit power and antenna matching, or as a semi-permanent monitor serving two transmitters by switching inputs. It’s suitable for home stations and field checks where a clear digital readout and quick reaction are helpful.
Pros
- Large, high-contrast 3.5" LCD for easy reading
- Covers HF through UHF with quick band switching
- Low insertion loss and reasonable accuracy
Cons
- SO-239 connectors feel lightweight and can be stressed
- Requires external 12V power; no internal battery
- Build quality varies between units
VerdictA straightforward inline meter with a large, easy-to-read display and quick response. It supports HF, VHF and UHF ranges, offers acceptable accuracy for casual and bench use, and is handy for stations with separate transmitters. Connector durability and the lack of an internal power source are the main drawbacks, but overall it delivers solid functionality for the price and application.
Reviews
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luger 5/5
Works fine
All good, thanks.
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David P 5/5
Big, clear display and fast response
The screen is very readable and the meter reacts quickly. Readings matched two other meters I own. It doesn’t include a separate AC supply but the 12V lead is provided. I have it connected to two radios and switching bands is effortless with the center toggle. Not the cheapest option but good value.
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James Carollo 5/5
Excellent display; bought a second unit
Arrived in perfect condition. I liked it enough to order another: one for HF and one for VHF/UHF to suit my layout. The amber backlight is easy on the eyes and accuracy checked well against other meters on HF. Important: test the power cable polarity with a meter — the tip/center is positive. Works fine on GMRS and similar bands.
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Donny O'Shield 5/5
Solid little meter
Performs well and has been dependable in regular use.
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Jack E. Biederman 5/5
Large screen makes readings effortless
The big digital display removes parallax and calculation hassles. Everything you need is shown plainly.
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PK 4/5
Readable but connectors feel fragile
The display is large and seems accurate. The coax/SO-239 fittings are on the light side and can be damaged when wrestling heavier RG-8 style cables during installation.
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Josh 2/5
Unreliable HF readings for some units
Mine bought in 2021 showed stable VHF/UHF results but erratic HF SWR compared to my rig’s internal reading. I paid a premium during supply shortages and can’t return it now. Consider alternative brands if consistency is critical.
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Gavan M Vigar 5/5
Power readout seems low out of the box
New unit reported about 3 watts when the radio should have been near 12 watts — worth verifying on arrival.
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J. Smith 5/5
Accurate and easy to read — highly recommended
Clear display and accuracy are as advertised, even around 100W. The low-power ranges are reliable, and I prefer it to my old analog meter. Requires 12V DC; no battery inside but that’s fine for a typical station setup.
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cavalierdog 5/5
Good match for dual-output radios
My transceiver has separate HF and 2m/70cm outputs so this meter pairs nicely. Power and SWR readings are accurate. The display refreshes a couple times per second and holds the last reading briefly. You can only monitor one side at a time and it needs 12V external power to operate.
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