EME228 Series Multiplier Kits
- EME228-1.8G Description:
Updated June 2022! - EME228-2.5G Description:
- EME228-1.8G Application Block
- EME228-2.5G Application Block
- Kit Constructors Alert:
- EME228-1.8G Kit Notes:
- EME228-2.5G Kit Notes:
- EME228-1.8G Kit Performance Tests:
- EME228-2.5G Kit Performance Tests:
- Kit Changes and Updates:
- Buy A EME228-1.8G Kit:
- Buy A EME228-2.5G Kit:
The EME228-1.8G Multiplier was designed to be used with a 576MHz Local Oscillator to provide a multiplied 1152MHz output to suit the Mini-Kits EME228-23CM Transverter for the 1.2GHz 23cm band. The design uses low cost FR4 PC board material and takes around 1 hour to construct, and uses SMD components to make the design compact in size, and reproducible in performance. The maximum tuning range of the filter is from around 0.85 to 1.8GHz, but when used under 1GHz the filter response is not flat and requires increasing of the filter coupling capacitors. A 0dBm input drive @ 576MHz is required to produce up to +16dBm output at 1152MHz.
The EME228-2.5G Multiplier was designed to be used with a 564MHz or 1128MHz Local Oscillator to provide a multiplied 2256MHz output to suit the Mini-Kits EME228-13CM Transverter for the 2.4GHz band. The design uses low cost FR4 PC board material and takes around 1 hour to construct, and uses SMD components to make the design compact in size, and reproducible in performance. The maximum tuning range of the filter is from around 1.6 to 2.5GHz, but when used under 1.9GHz the filter response is not flat and requires increasing of the filter coupling capacitors. A 0dBm input drive @ 564MHz is required to produce up to +11dBm output at 2256MHz.
The pictures below show the basic constructed Multiplier, and the Kit construction notes and overlay diagrams should be carefully followed when constructing. For larger pictures to check orientation of some components click the images below. BUY THIS PRODUCT
Top view of the EME228-1.8G with optional connectors
This picture shows the 9v regulator on the bottom side of the Rev1.0 board
EME228-1.8G frequency response when tuned to 1152MHz. The Multiplier can also be used as a 25dB gain amplifier.
EME228-1.8G Wide span when the filter is tuned to 1152MHz
EME228-1.8G frequency response when tuned to 900MHz. The Multiplier can also be used as a 25dB gain amplifier.
EME228-1.8G frequency response when tuned to 1.75GHz. The Multiplier can also be used as a 25dB gain amplifier.
EME228-1.8G output from the GALI-39 Multiplier when driven with a 576MHz 0dBm input
EME228-1.8G output when driven with a 576MHz 0dBm input and the multiplier drive set for a +10dBm output @ 1152MHz.
The pictures below show the basic constructed Multiplier, and the Kit construction notes and overlay diagrams should be carefully followed when constructing. For larger pictures to check orientation of some components click the images below. BUY THIS PRODUCT
Top view of the EME228-2.5G with optional connectors
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This picture shows the 9v regulator on the bottom side of the Rev1.0 board
EME228-2.5G frequency response when tuned to 2256MHz. The Multiplier can also be used as a 30dB high gain amplifier.
EME228-2.5G frequency response when tuned to 2400MHz. The Multiplier can also be used as a 30dB high gain amplifier.
EME228-2.6G output when driven with a 492MHz -3dBm input. The output at 2460MHz is the mixing of 1968 and 492MHz and can be reduced with a Mini-Circuits LFCN-1800 low pass filter if required.
EME228-2.6G output when driven with a 492MHz -3dBm input. With a LFCN-1800 low pass filter the mixing output at 2460MHz is 10dB lower at the expense of lower output at 1968MHz.
EME228-2.6G output when driven with a 564MHz 0dBm input. The output at 2820MHz is the mixing of 2256 and 564MHz and could be reduced with a Mini-Circuits LFCN-2250 low pass filter if required.
There are no updates or changes to this Kit.
1/ When using a 70cm 430MHz IF with an 82MHz crystal with x6 to 492MHz for a 1968MHz output, a mixing product of 2460MHz ( 492+1968MHz ) occurs and is inside the passband of a 12cm 2400 to 2500MHz Transverter. This can be difficult to remove and was found to cause a problem to a high power RF amplifier with oscillation. Fitting of a 1800MHz, LFCN-1800 low pass filter on the output of the multiplier decreases the 2460MHz product from -40 to -50dBc. A better option is to use a 656MHz oscillator using a 109.333333MHz crystal to drive the multiplier which removes mixing products from the Transverters passband.