Pete Bates GM4BYF gave a very interesting talk, with audio examples, of the technique of communication by signal scatter from the underside of an aircraft flying between the two stations. He also showed a number of items of test equipment to enable this technique - frequency standard, frequency meter and spectrum analyser, which are now available at remarkably affordable prices.
Airscout dynamic display showing the aircraft, identified by size and therefore usefulness for this technique.
Pete played audio recordings, with signal strength displays of two aircraft scatter QSOs on 23cm.
Click for the recording of the G7LRQ QSO.
QSOs with other stations located at distances up to 500km and screened by mountains, would not normally be possible without this technique.
An aircraft Scatter QSO is scheduled in advance with the exact frequency specified.
CW can be used but Pete chose SSB as a more practical mode.
Pete's test equipment to enable aircraft scatter communication: frequency standard, frequency meter and spectrum analyzer.
Many thanks to Pete for a very well-prepared and presented talk.