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darrylalvarezAug 3, 2025
Why does my Nissei Measuring Instruments SWR show “99.99“?
- LLawrence CoxAug 3, 2025
If the SWR reading on your Nissei Measuring Instruments displays “99.99“, it indicates that the antenna cable may have a short.
Why does my Nissei Measuring Instruments SWR show “99.99“?
If the SWR reading on your Nissei Measuring Instruments displays “99.99“, it indicates that the antenna cable may have a short.
How to fix FWD Power less than 25 Watts on Nissei RS-50M Measuring Instruments?
To address FWD Power being less than 25 Watts on your Nissei Measuring Instruments: * Make sure you are testing on Channel 72, a 25 Watt Channel, as some channels are limited to 1 Watt. * Check the battery voltage on the radio. Most VHF radios will only transmit full power (25 Watts) with 13.8 volts DC power.
What to do if Nissei Measuring Instruments RS50M has no display?
If your Nissei RS50M Measuring Instruments device shows no display, first check the batteries. Replace them with 2 x AAA Alkaline (1.5v), NiCad, or NiMH (1.2v) rechargeable batteries. Alternatively, you can use the Micro USB cable supplied with the device.
What to do if Nissei Measuring Instruments REF shows “--.--“?
If the REF on your Nissei Measuring Instruments shows “--.--“, take the following steps: 1. Ensure you are testing on channel 72 (25 watt) instead of a 1 watt channel. 2. Verify that the radio and antenna connections are not reversed. 3. Confirm that the wiring and connections from the radio to the antenna are in good condition.
General| Input/Output Impedance | 50Ω |
|---|---|
| Weight | 500 g |
| Accuracy | ±10% of full scale |
| SWR Detection Sensitivity | 1W |
| Connector | M (SO-239) |
| Resolution | 0.1 W |
| Display | Analog meter |
| Power Supply | None required (passive device) |
| Frequency Range | 1.6 to 60 MHz |
Defines FWD (Forward Power), REF (Reflected Power), and SWR (Standing Wave Ratio) for accurate interpretation.
Explains the meter's function: detecting PTT and measuring Forward Power, Reflected Power, and SWR.
Provides a guide to SWR readings (1.00 to 3.00+) and their implications for radio performance.
Warns that high SWR values or testing without an antenna can damage the radio transceiver.
Instructions for installing AAA batteries and using the USB port for continuous power.
Details on connecting the transceiver to the 'TX' and antenna to the 'ANT' connectors.
Guides on tuning the transceiver, monitoring the channel, and taking readings via PTT.
Advises turning off power and light switches after use to conserve battery life.
Highlights the critical need for strong radio signals for MAYDAY calls and marine rescue.
Lists common issues like antenna height, battery voltage, obstructions, and cable problems.
Illustrates power loss due to low voltage and cable issues, and the benefits of replacement.
Solutions for low FWD power, incorrect REF readings, and channel selection.
Guides for SWR readings like '99.99' or '---.--' and checking connections.
Steps to take when the meter shows no display, focusing on batteries and power.
Lists key technical details including frequency range, RF power, impedance, and connectors.
Provides company details, contact numbers, website, email, and copyright notice.
