The EME215 Active receive antenna switch is ideal for use with the Mini-Kits Active whip and loop antenna amplifiers when used with a HF Transceiver that only has a single antenna socket.  This then allows automatic switching from the receive only to the main antenna when going from RX to TX mode.  The Active RX only antenna can also be switched out manually to the main antenna if required using the power on/off toggle switch.   The design incorporates a bias tee to power the RX Active amplifier via the coaxial cable, and includes protection for the RX Active by using a high isolation Relay that deactivates if no power is present.  In case the PTT connection has been disconnected but the RX Active switch is powered up, then a  further safeguard protection using a RF detector automatically switches the relay from RX to TX mode deactivating the relay protecting the RX Active.    The board is fitted with PTC protection to safeguard against any short circuits on the RX Active connection, and uses a Transorb for over voltage and reverse polarity protection. EME215 Application Block Diagram

Please select the connector types that you require for the RX Active, Radio, and Antenna connections.  

The Product image shows a fully constructed Kit product.  Please refer to the Options Tab for the descriptions of the various products available.

Please Note: Built products usually need to be constructed and can take up to 2 weeks to ship depending on work load, but are normally shipped in few days.

EME215-KIT is the complete Kit that includes the PC board, instructions, all on board components, enclosure, hardware.  Requires complete construction, and soldering of some SMD components.

EME215-B Is a fully constructed and tested Product

Connector Option RX Active is the RF connector that connects to the Active Receive antenna. This option must be selected and is not optional.

Connector Option RADIO is the RF connector that goes to the Radio Transceiver.  This option must be selected and is not optional.

Connector Option ANTENNA is the RF connector that goes to the main HF Antenna that is used for Transmitting.  This option must be selected and is not optional.

The  connectors must be selected when ordering either the Kit or built product, and are available in BNC, N, and F types.

All Kits are built Products include a 2.1mm DC power cable

Frequency Range:
500kHz to 100MHz
Insertion Loss:
<0.1dB from 1 to 100MHz
Return Loss:
>20dB from 1 to 100MHz
Relay Isolation from Radio to RX Active:
>55dB from 0.5 to 50MHz
RF Power Handling:
100Watts CW ( 200W PEP ) maximum 1.8 to 30MHz
DC Power Handling:
Up to 200mA @ 13.8vdc ( Maximum for powering Amplifiers )
Operating Voltage: +13.8vdc nominal ( +15vdc maximum )
Product Size: 110mm L x 60mm W x 46mm H ( Includes Connectors )

For more information see the EME215 KIT WEBPAGE

Please refer to the EME215 Application Block Diagram on how this Kit is used

HF Active Receive Antenna Switch

  • Brand: Mini-Kits
  • Product Code: EME215-KIT
  • Quantity In stock: 10
  • $68.95

Available Options


12vdc 500mA Linear Plugpack

12vdc 500mA Linear Plugpack

Price $14.50 ea

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