The Mini-Kits High Performance VHF 1.25m band RX/TX masthead Pre-amplifier has been designed to be easy to construct, and is suitable for the 222-225MHz Amateur Band. The design uses a Mini-Circuits PGA-103 E-PHEMT amplifier that has a very high dynamic range and ultra low noise figure, and provides superior performance to Mos or GaAs FETs. The design incorporates VOX RF sensed changeover Relays for Trasnsceivers up to 100 Watts CW without using sequencing, or can handle up to 500 Watts PEP if sequencing is used. An on board bias tee ( DC power injector ), allows the pre-amplifier to be antenna mounted and powered via the coaxial cable. A Tuned input T type filter and output low pass filter provides high rejection of signals at 50 and 430MHz.


The Product picture shows a completed EME220-1.25M KIT1 product with Optional BNC connectors

This product is ideal for use with the Icom IC-375 Multimode VHF transceiver and Transverters that have a PREAMP switch to supply +12vdc out of the antenna connector on RX mode. Transceivers without this function will require an external bias tee like the Mini-Kits EME168-2-70 to supply DC power up the coaxial cable.  When using a high power RF amplifier up to 500 Watts, additional sequencing will be required to protect the pre-amplifier from damage.  The Mini-Kits EME166 Sequencer can be adapted to be used for correct sequence timing of the Rx to TX changeover.

For more information see the EME220 Kit Webpage

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.

EME220-1.25M KIT1 is a Basic Kit that includes the PC board, Instructions, and all on board components.  No connectors or enclosure are included. Requires Complete construction.

EME220-1.25M KIT2 is the KIT1 but also includes the BNC connectors and Nickel sprayed GME enclosure. Requires Complete construction.

EME220-1.25M KIT3 is the KIT1 but also includes a Hammond 1590S enclosure, BNC connectors and all hardware. Requires Complete construction.

EME220-1.25M-MH  Is a fully constructed product in a Nickel sprayed GME Masthead enclosure with female BNC connectors.

EME220-1.25M-MOD  Is a fully constructed Module board with female BNC connectors.

EME220-1.25M-BNC-S  Is a fully constructed product in a Hammond 1590S Die cast enclosure with female BNC connectors, 2.1mm DC socket.

The basic EME220-1.25M KIT1 Does Not include connectors, miscellaneous hardware, or enclosure. The KIT2 and KIT3 includes the enclosure, connectors and all required hardware. These Kits are Ideal for experienced constructors that have had experience with SMD construction.  The EME220-1.25M-KIT3 requires metalworking tools to drill the enclosure.

Frequency Range:
210 to 230MHz ( BW 10MHz @ 1dB )
Band Rejection: Typically 40dB @ 50MHz, 18dB @ 144MHz, 60dB @ 430MHz
Gain Adjustable: Typically +17dB Max, 8dB Min @ 223MHz
Noise Figure:
0.8dB ( Typically <0.7dB @ 223MHz )
Through Loss:
0.3dB @ 223MHz ( Bypass Mode )
RF Power Handling:
100W CW ( Un-Sequenced ) 500W PEP ( Sequenced )
Minimum RF Input:
+20dBm ( 100mW ) To activate the RF sensing circuit
Operating Voltage: +11 to 15vdc ( +12vdc @ 150mA Recommended )
Board Size: 80mm L x 84mm W x 25mm H ( with BNC connectors )
Kit Webpage: For actual product Tests see the EME220 Kit Webpage

For more information please see the EME220 KIT WEBPAGE

1.25m 220MHz VHF RX/TX Preamplifier

  • Brand: Mini-Kits
  • Product Code: EME220-1.25M KIT
  • Quantity In Stock: 10
  • $59.95

  • Export: $54.50

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2M / 1.25M / 70CM RX/TX Bias Tee

2M / 1.25M / 70CM RX/TX Bias Tee

$54.95 Export: $49.95

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