# Tag Info

Accepted

### How does an SWR meter really work?

Dispelling the Myth To begin with, the typical HF SWR meter does not have the ability to separately sample the forward and reverse power, voltage, or current. Any description of the device or its ...
• 18.6k
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### What is the impedance of an end-fed half-wave antenna?

It's very difficult to predict the impedance of an end-fed wire, other than to say it's high. Usually it's determined empirically. You are looking for a theoretical formulation. Consider, the ...
• 52.1k
Accepted

### Antenna Efficiency

In theory, if you had lossless conductors in the antenna and a lossless matching network, your shortened, 1 foot dipole would have a gain of only ~0.7 dB less on 160 meters than the gain of a full ...
• 18.6k

### Impedance ratio vs. SWR

As you can see from the following equation, it is definitely not that easy. What I would do is draw a 10:1 SWR circle on a Smith Chart and assume that your tuner can match all of the infinite number ...
• 1,676
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• 11.6k

### Is this result correct ? [ impedance cavity based on emtamaterials using CST Microwave]

Antenna efficiency over 130% would mean a perpetual motion machine, so probably not.
• 52.1k

### Antenna tuner at the transceiver output confusion

Having a transmatch (antenna tuner) at the feed point of the antenna can be an excellent way to solve the problem of a mismatched antenna; an antenna system with the transmatch at the feed point of ...
• 9,262