RAM-34 RX Pre-amplifier System

  • 4 antenna inputs
  • Bandpass filters for 160M-80M-40M with over 40 dB adjacent band attenuation
  • Automatic band selection with Shacklan equipped band decoders
  • +20 dB gain amplifier
  • Step attenuator
  • Gain adjustable from -20 dB to +20 dB in 5 dB steps
  • Memorize gain settings for each antenna on each band
  • Fully remote controllable
  • 1 watt RF transistor for superior strong signal handling
  • Anodized aluminum case
  • Laser engraved panels


   The RAM-34 is a complete pre-amplifier system designed primarily for the low bands 160M thru 40M. It has inputs for four receive antennas and internal 3-pole bandpass filters for 160M, 80M and 40M. In addition to the pre-amplifier, it has a step attenuator that together with the amplifier stage provides gains from -20 dB to +20 dB in 5 dB steps. This allows equalizing the signal levels between the antenna inputs. Gain settings are memorized for each antenna on each band. Different types of receive antennas have different signal levels and the gain memories eliminate the need to adjust the receiver or pre-amplifier when switching between the antennas.

   The amplifier stage uses a 1 watt RF transistor that is capable of handling strong input signals without any overloading or clipping problems. This is crucial in a low band pre-amplifier where strong local signals may be present 

   As with all products in the Shacklan lineup, the RAM-34 may be fully remotely controlled by software. The RAM-34 is packaged in a rugged anodized aluminum case with laser engraved front and rear panels.

   Shown below are plots of the internal bandpass filters.

IMPORTANT NOTE: Your radio MUST have a separate connection for receive antennas.

Sweep of 160M bandpass filter

Sweep of 80M bandpass filter

Sweep of 40M bandpass filter