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 output low pass filter provides high rejection of signals at 144 and over 500MHz.
THIS KIT IS NOT FOR BEGINNERS AND REQUIRES VERY EXPERIENCED SMD SOLDERING SKILLS
The Product picture shows a completed EME237-70CM KIT product with the recommended Optional TNC03 connectors. For more information on cables and connectors that can be used, see the EME237 Kit webpage.
This product is ideal for use with the Icom Multimode UHF transceivers including the IC-910, IC9100, IC-475, 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 EME237 Kit Webpage for more information.
EME237-70CM KIT: is a Basic Kit that includes the PC board, Instructions, and all on board components. No connectors or enclosure are included. Requires Complete construction.
Skill Level: These Kits are designed for very advanced constructors with skills to fit SMD components. Don't Buy the Kit unless you have the skills to construct it.
Connector Options: It is highly recommended that TNC03 connectors are used if you are using the GME Mashead enclosure. BNS11 can be used with both enclosure options, and TNS03C is only for the 1590S Enclosure Kit.
Enclosure Options: The GME Masthead enclosure is internally coated with MG Super Shield Nickel paint. The 1590S enclosure Kit includes a Hammond 1590S diecast enclosure, all nuts and bolts hardware, and 2.1mm DC socket and power cable.
Requires Complete construction. 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.| Specifications | |
|---|---|
| Frequency Range: | 430 to 450MHz ( BW 20MHz @ 1dB ) |
| Band Rejection: | Typically >35dB @ 145MHz, >60dB @ 900MHz |
| Gain Adjustable: | Typically +29dB Max, 20dB Min @ 435MHz |
| Noise Figure: | 1dB ( Typically <0.9dB @ 435MHz ) |
| Through Loss: | <0.7dB @ 435MHz ( Bypass Mode ) |
| RF Power Handling: | 50W CW ( Un-Sequenced ) 100W PEP ( Sequenced ) |
| Minimum RF Input: | +20dBm ( 100mW ) To activate the RF sensing circuit |
| Operating Voltage: | +11 to 15vdc ( +12vdc @ 180mA Recommended ) |
| Board Size: | 80mm L x 84mm W x 17mm H ( with TNC connectors ) |
| Kit Webpage: | For actual product Tests see the EME237 Kit Webpage |
For a built product for Australia and New Zealand Only see the Product webpages for
EME237-70CM-MH ( Masthead enclosure version ) Product webpage
EME237-70CM-1590S ( Hammond 1590S Enclosure version ) Product webpage
Built Products are not available for Export to other countries
For more information please see the EME237 KIT WEBPAGE
70cm 430-450MHz UHF RX/TX Preamplifier Kit
- Brand: Mini-Kits
- Product Code: EME237-70CM KIT
- Quantity In Stock: 4
-
$81.50
- Export: $74.09
Available Options
Related Products
