The Mini-Kits EME237-70CM is a High Performance RX/TX masthead Pre-amplifier, and is specifically designed for the 70cm 430-450MHz 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 70cm band, and also to suit the receiver gain.  The design incorporates VOX RF sensed changeover Relays for Trasnsceivers up to 50 Watts CW without using sequencing, or can handle up to 100 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 low pass filter provides high rejection of signals at 144 and 500MHz.

The Product picture shows a completed EME237-70CM-MH product with TNC connectors. N type connectors or adapters cannot be fitted as they are too large for the enclosure.

Refer to the application block diagram and the EME237 product Webpage for more information.

EME237-70CM-MH Is a fully constructed product in a Nickel sprayed GME masthead enclosure with TNC female connectors.  Please see the specifications TAB for more information.

N Type female connectors will not fit on this product due to the masthead enclosure internal dimensions.

Specifications
Frequency Range:
430 to 450MHz ( BW 20MHz @ 1dB )
Band Rejection:Typically >35dB @ 145MHz, >60dB @ 900MHz
Gain Adjustable:Typically +29dB Max, 20dB Min @ 1290MHz Adjustable
Noise Figure:
1dB ( Typically <0.9dB @ 1290MHz )
Through Loss:
0.7dB @ 435MHz Bypass Mode
RF Power Handling:
50W CW ( Un-Sequenced ) 100W PEP ( Sequenced )
Minimum RF Input:
+20dBm ( 100 mW ) To activate the RF sensing circuit
Operating Voltage:+11 to 15vdc ( +12vdc @ 180mA Recommended )
RF Connectors:TNC Female ( Not available in other types )
Maximum Cable Diameter:6.5mm ( CNT-240® RG-8X Recommended )
Enclosure Size:125mmL x 115mmW x 40mmD
Kit Webpage:For actual product Tests see the EME237 Kit Webpage

This Product is available to ship to Australia and New Zealand Only and is Not available for Export to other countries.

Please Note: Built products need to be constructed and can take up to 10 working days before being shipped.

For more information please see the EME237 Product Webpage

70cm 430-450MHz UHF RX/TX Masthead Preamplifier

  • Brand: Mini-Kits
  • Product Code: EME237-70CM-MH
  • Quantity In Stock: 1
  • $249.95

  • Export: $227.23

Available Options


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