The New Mini-Kits EME221-23CM is a High Performance RX/TX masthead Pre-amplifier, and is specifically designed for the 23cm 1240-1300MHz Amateur Band. The design uses the 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 gain is adjustable so that the gain distribution can be optimized for coaxial cable loss that can be significant on the 23cm band, and also to suit the receiver gain.  The design incorporates VOX RF sensed changeover Relays for Trasnsceivers up to 25 Watts CW without using sequencing, or can handle up to 50 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 145 and 435MHz.


The Product picture shows a completed EME221-23CM KIT1 product with Optional TNC connectors.  N type connectors cannot be fitted as they are not available or manufactured in R/A PCB mounts.  For more information on cables and connectors that can be used, see the EME221 Kit webpage

This product is ideal for use with the Icom Multimode UHF transceivers including the IC-910, IC9100, IC-1275, and IC9700 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 EME168-70-23 to supply DC power up the coaxial cable. Refer to the application block diagram and the EME221 Kit Webpage for more information.

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.

EME221-23CM 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.

EME221-23CM KIT2 is the KIT1 but also includes the TNC female connectors and Nickel sprayed GME enclosure. Requires Complete construction.

EME221-23CM-MH  Is a fully constructed product in a Nickel sprayed GME enclosure with TNC female connectors.

The basic EME221-23CM KIT1 Does Not include connectors, miscellaneous hardware, or enclosure.  Do Not construct this Kit unless you are very experienced with surface mount construction, and only if you have a quality soldering iron and 60/40 Tin Lead solder.

Frequency Range:
1130 to 1430MHz ( BW 300MHz @ 1dB )
Band Rejection: Typically >68dB @ 145MHz, >47dB @ 435MHz
Gain Adjustable: Typically +22dB Max @ 1290MHz Adjustable
Noise Figure:
1.5dB ( Typically <1.2dB @ 1290MHz )
Through Loss:
0.8dB ( Typically <0.6dB @ 1290MHz ) Bypass Mode
RF Power Handling:
25W CW ( Un-Sequenced ) 50W PEP ( Sequenced )
Minimum RF Input:
+30dBm ( 1Watt ) To activate the RF sensing circuit
Operating Voltage: +11 to 15vdc ( +12vdc @ 200mA Recommended )
Board Size: 80mm L x 84mm W x 17mm H ( with TNC connectors )
Kit Webpage: For actual product Tests see the EME221 Kit Webpage

For more information please see the EME221 KIT WEBPAGE

23cm 1296MHz UHF RX/TX Preamplifier

  • Brand: Mini-Kits
  • Product Code: EME221-23CM KIT
  • Quantity In stock: 2
  • $92.95

Available Options


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