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· 1. Woodpecker: A high power, low
PRF radar signal consuming a bandwidth of 40 kHz or so changing frequencies
every several seconds. It operated over the range of 7-19 MHz.
· 2. Sweeper I: A high power,
sweeping carrier (about +100kHz/sec) starting from around 5 to 7 MHz and
sweeping up to 15 to 26 MHz at times.
· 3. Sweeper II: A high power,
sweeping carrier (about +125kHz/sec) starting from around 5 MHz and
sweeping up to 22+ MHz at times. There appears to be more than one
transmitter and they may be out of phase or on a different sweep range.
Operation may be 24 hours but reception times and frequencies here on the
west coast of Canada seem to correspond with a transmitter in East Asia,
perhaps China. In November it has been heard to some extent almost around
the clock but not so well form 1800 to 2200 UTC (bad for Asia to Western Canada).
If you monitor a fixed frequency say 7 MHz, the main signal passes by
about every three minutes. It is easier to detect with wide receiver IF
bandwidth and in SSB or CW position.
Another possibly related signal can be heard sometimes in the 11.9 to 12.3
MHz range sweeping at about 2 sweeps per second and only over 100 to 200
kHz with an AM buzz.
· 4. Sweepers: They are still easliy audible here on the west coast but amateur
operating activity is quite low these days so I guess this section will be gone
soon (along with amateur radio?).
Any reports or ideas on Sweeper II? Please contact me with any
information at: 
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