Internal Beats; Spurious Signals On The Bandscope - Kenwood TS-890S Instruction Manual

18 TROUBLESHOOTING

Internal Beats

Internal beats may occur within some of the amateur band
frequencies. This is due to the frequency configuration of this
transceiver and is not a malfunction.
Example: 29.699 MHz, 51.957 MHz, 53.784 MHz, etc.

Spurious Signals on the Bandscope

Signals that are unrelated to the RX signals may sometimes
appear on the bandscope (waterfall). These are internal beats due
to the frequency configuration of this transceiver and is not a
malfunction. Adjusting the reference level or attenuator of the
bandscope may sometimes help to minimize the appearance of
spurious signals.
18-12