Best Selling in Meters See all. Bird Technologies 5E Wattmeter Element 4. You may also like. Vanco Radio Meters. Vanco CB Radios. Vanco Vintage Speakers. Vanco Vintage Electronics. Most instances where the antenna length is too short are caused by a lack of ground plane.
In modern antennas, there's usually a method for adding length built in to the antenna. Other options, such as adding a spring, are also legitimate. Dual antenna installations : If you're tuning dual antennas, you'll want to adjust both antennas the same amount each time. As a starting point, it's best to put the tuning screw either all the way in or out, so each antenna is the same length. AG3Y , Aug 16, There's no amplifier in that meter.
It's a diode detector connected to an external collapsible whip antenna. It works as a FS meter, but the indications don't mean much. I guess you can tell if you are transmitting, or not. That's pretty much all it will tell you. The "SWR bridge" section where you connect it in line between a transmitter and antenna should work fine on many bands, probably including two meters. There were zillions of these made, sold under various names including Midland, Calrad, et al.
They're fine. Most of us have had many of them. Based on their construction, they shouldn't have any loss at all on 2 meters; however, above that I'd be careful: They have some loss on MHz, and more loss on MHz, and above that it's not useful. Sears has sold several SWR meters over time. I found pictures of one of them, and it is identical to the Vanco SWR 3, which is rated for Mhz. So, they are not rated for 2 meters. I've actually tested a couple of these and found that they still work on 2 meters, but your mileage may vary a whole lot.
SWR meters are normally one and the same thing. Current and voltage standing waves are set up when power is reflected from a mismatch, and often their is a focus on the voltage elements.
When looking at how to use a SWR meter, most instructions are fairly vague, often just detailing which connector is to be connected to the antenna and which connector to the transmitter. The SWR meter is connected in the feeder from the transmitter to the antenna. Typically it is located at the transmitter end of the feeder for convenience, and so that the actual SWR as seen by the transmitter can be monitored. Again for convenience these are often placed near the transmitter.
It is often more convenient to place an ATU close to the transmitter as having a remote one often means getting power to it and also weather-proofing it and this adds significant cost.
When an ATU or antenna matching and tuning unit is added to the set-up, the system shown below is normally used. This is normally the most critical point to monitor the SWR because high SWR levels can damage the power amplifiers if no protection is incorporated, or it can result in the protection circuits backing off the power.
However it is found that if the coax feeder can withstand the higher voltages and current as a result of the poor antenna match, and the feeder loss is not too high, then the system will work well. When using the SWR meter to measure the performance of a new antenna or where the SWR may not be know, it is wise to use a low power and a clear channel.
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