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Author Topic: transmission, no antenna  (Read 380 times)

Cliff Fuller

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transmission, no antenna
« on: October 18, 2018, 02:41:56 pm »

I've got a Telex ST300 Transmitter (hearing impaired system) that seems to transmit just fine with or without an antenna. The channel used is "A", 72.1 MHz. Can someone explain this to me?


Brian Jojade

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Re: transmission, no antenna
« Reply #1 on: October 19, 2018, 03:01:46 am »

Think of it like a garden hose.  If you don't put a nozzle on the end, you'll still get water coming out.  It may not go where you want it to, and won't go as far, but it's still coming out.

RF is doing the same thing.  Without an antenna, the little end of the connector is acting as the antenna.  The response is going to be unpredictable, but may be plenty strong if you are nearby.
Brian Jojade
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