How do I make one ?
Those were abundant around 15 years ago as cell phone gadgets for about $1; lighting up when the phone was in use. Some were stubby antennas, some were just flashy headturner gadgets adhered to a cell phone.
Cannot find them now.
It is to monitor the activity of a 'hot spot' device by attaching one near/on it. 'Hot spots' are supposed to be cell phones with internet access without the phone part.
If I remember well, a couple of LEDs counterparalleled with leads cut to RF quarter wavelenghts should work. Can you confirm ?
Edited: Got it. It is working. Just an RF diode in series with a single red LED with a loop antenna, on top of the hotspot. Done.
Those were abundant around 15 years ago as cell phone gadgets for about $1; lighting up when the phone was in use. Some were stubby antennas, some were just flashy headturner gadgets adhered to a cell phone.
Cannot find them now.
It is to monitor the activity of a 'hot spot' device by attaching one near/on it. 'Hot spots' are supposed to be cell phones with internet access without the phone part.
If I remember well, a couple of LEDs counterparalleled with leads cut to RF quarter wavelenghts should work. Can you confirm ?
Edited: Got it. It is working. Just an RF diode in series with a single red LED with a loop antenna, on top of the hotspot. Done.
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