New for Autumn 2020
At last we have a 4m masthead preamp available from SSB!
With similar base specifications to the SP200 the new SP400 covers 70-71MHz with a nice low noise figure (nf) and decent bandpass filtering to give good out of band strong signal rejection.
Power can be fed either directly yo the unit or Bias T fed up the coax. The SP400 has rf-sensed switching so can be used without a sequencer at up to 100W rf power level. Above that a sequencer is recommended to avoid hot switching. Fully sequenced the SP400 will handle 400W CW/FM/DATA modes or 750W pep SSB (more than enough for the UK 22dBW power limit for sure!)