Re: Air Band Receivers
toggle quoted messageShow quoted text
Airband is what aircraft of all types - commercial, non-commercial, fixed wing, helicopter/rotor, military - use to communicate with each other and local air traffic control facilities. The VHF airband for voice is 118Mhz to 136MHz with 25KHz separation in the US/Canada and 8.33KHz in Europe. This is what is labelled airband on most radios and most commonly listened to especially if you reside below common airlanes or near airports. Although residing above the FM Broadcast band, the signals are often harder to hear as aviation band radios are much lower in power (< 100W) than FM band transmitters (xKW or xMW) and require more sensitivity to hear. This is a bit harder to do as you can then suffer overload effects from the FM band.
In the Los Angeles area, i can hear at a range of 15-20 miles when helicopters are up at about 1000 feet on 123.025. However, the local ground utility frequency of 122.950KHz is rarely heard and i am above a local municipal airport about 3 miles away. This through use of a scanner or amateur 2 meter radio tuned to the aviation band.
There is a separate set of HF SSB frequencies used by aircraft for overwater transit. These can be picked up by receivers having SWL coverage and SSB/BFO feature. These are harder to "intercept" as they are propagation dependent but have the capability of being heard worldwide.
On Sun, Jul 18, 2021 at 7:18 PM Frank Standford <dxer2k1@...> wrote: