Broadcast FM Whistling
 | |
|---|---|
| Frequencies | 102 MHz |
| Frequency Range | 102 MHz - 102 MHz |
| Mode | DSB |
| Modulation | — |
| ACF | — |
| Location | |
| Short Description |
I was scanning FM radios when suddenly I found this. Possible solution: Hobbyist single-transistor tracking transmitter. |
| I/Q Raw Recording | — |
| Audio Sample | |
Additional Images[edit]
Solution: Probably single-transistor SAW oscillated TXTransmit, probably hobbyist. Data input and/or Vcc of TXTransmit seems to be discharging a capacitor which is periodically fed a charge pulse; doing that to a single transistor TXTransmit results in exactly this, a signal that gradually drifts it's frequency while lowering it's amplitude. This can be used as a tracking transmitter, compatible with USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) mode; it could be for a lost RC plane finder for example. The lower/higher pitch tone audible at the fadeout-spot, and the louder the general volume, the closer it is.
