The Mini-Kits EME211 M1 Series RF Attenuator and 9MHzTrap filter is part of a building block to construct the M1 Series HF Transceiver, but can also be used as a general purpose 6dB per step switchable attenuator, and 9MHz IF Trap filter. The attenuator uses two relays to provide attenuation steps of 0dB, 6dB, 12dB, and 18dB.  The 9MHz trap uses high Q tuned circuits that when carefully adjusted, provides greater than 50dB of attenuation at 9MHz while keeping loss to less than 0.4dB at 7.3MHz.

For more detailed information on how this module Kit can be used, Please refer to the EME211 KIT webpage.

This Kit is ideal for all constructors mainly due to the use of conventional leaded components.  Only a very small number of surface mount components have been used due to component availability.  The basic Kit includes the PC board and all onboard components, but excludes the SMA connectors which can be purchased separately if required.

For the highest performance and reliability, Only high quality first grade components from large suppliers in the USA, or direct from major manufacturers are used in this Kit.

EME211-KIT is the Basic Kit that only includes the PC board, Instructions, and on board components. RF Connectors are Not included. Requires complete construction, and soldering of some SMD components.

EME211-PCB is the PC board, and Instructions only, No on board components or RF Connectors are Included. ( Not recommended as many components are not readily available )

2 x SMA33 connectors are recommended to use with inter-wiring of the module board Kits.

1 x IDC16S connector is recommended to use with inter-wiring of the module board Kits.

Kits Do Not include miscellaneous hardware, enclosure, or connectors.

Bandwidth: 500kHz to 50MHz @ 0.1dB
Switchable Attenuators: 0dB, 6dB, 12dB, 18dB +/- 1dB
Trap Filter Frequency:
9MHz ( Adjustable +/- 1MHz )
Trap Filter Notch:
>50dB @ 9MHz
Operating Voltage: +10 to 15vdc ( +12vdc @ 100mA both relays activated )
Board Size: 73mm L x 42mm W x 17.5mm H

M1 Series HF Attenuator 9MHz Trap

  • Brand: Mini-Kits
  • Product Code: EME211-KIT
  • Quantity In stock: 80
  • $31.95

Available Options


IDC16S 8x2 DIL 2.54mm

IDC16S 8x2 DIL 2.54mm

Price $0.77 ea

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