Posted: 10/19/2015 8:43:09 PM EDT
| I just received a czech morse key and the seller threw in a vacuum relay. Not to sound ignorant, but what do you do with a vacuum relay with morse code? |
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Please post a picture. He might have used it as an interposing relay between the key and his older radio. Some old radios have high switching voltage and an interpose relay is used for safety.
Many high power RF amplifiers use vacuum relays to switch its output TX / RX. The reason is that they don't arc and make very little noise when switched. The low noise is important for full QSK CW operation. There are many more applications for vacuum relays. I used small ones for switching high voltage loads in my home brew projects. I have used vacuum capacitors in antenna tuners and amplifiers as well. |