How do I test my VHF antenna?
You can also test the antenna by disconnecting it from the radio and seeing how its signal weakens or disappears. Slowly reconnecting just the tip of the coax connector should slowly increase the signal.
How do I test a VHF antenna with a multimeter?
Most aerials will look like a short circuit to a dc multimeter and so are hard to test. You can test the coax that feeds it – sort of – if you unplug it at both ends. You then should see continuity between both ends of the screen and the same for the centre conductor. You should see open circuit between them.
How do you test a VHF coaxial cable?
This is the most common test because SWR meters are widely available, inexpensive, and easy to use.
- Disconnect the antenna at the masthead.
- Connect the VHF radio to the SWR meter, and the other port of the SWR meter to end of the coax that was connected to the radio.
- Repeat with antenna connected.
What is the resistance of a VHF antenna?
VHF antenna is vertical antenna with the length of approximately 1 m. VHF antenna is placed on a position as high as possible. The connection between the VHF radio and VHF antenna is made by coaxial cable. This coaxial cable will have an impedance (resistance for alternating current AC) of 50 Ω (Ohm).
How do you test if an antenna is working?
Use one lead of the multimeter to touch the metal part of the antenna and also touch the other lead to the metal core of the cable. Note: The ohms reading should be zero. If the resistance is more than that, the antenna or cable is damaged, and prevent signal from reaching the reception device.
How do I know if my VHF radio is working?
Perform a radio check to ensure your unit is functioning properly—do not use channel 16 this. Use an “open channel” to performance the check (channels 68, 69, 71, 72 and 78A). Turn radio to one-watt power setting, and key the microphone. Call “radio check” three times, followed by your boat name and location.
Do VHF antennas go bad?
If the antenna was properly made and properly sealed, hermetically, it will never go bad.