EME227 Series Transverter Kits

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EME227-12CM KIT Description:

The EME227-12CM is a High performance Transverter for the 2.4GHz 12cm band. The design uses low cost FR4 PC board material and takes around 3 hours to construct. The Transverter is designed as a transmit up, and receive down converter with a fixed frequency range of 2400 to 2483.5MHz, and is suitable for either a 147 or 435MHz Transceiver. A large number of SMD components are used to make the design compact in size, and reproducible in performance. Modern PHEMT devices along with SAW filters, a +7dBm Mixer and Gali amplifiers are used, and an onboard 5 watt dummy load and RF sensing is used to allow the direct connection of a 5Watt 147 or 435MHz Transceiver. The receiver uses an Broadcom / Avago MGA86563 PHEMT amplifier with a measured 2.5dB noise figure that is very good for terrestrial use, and a suitable mast mounted low noise preamplifier could be used if required. The transmit output uses a Gali-84 amplifier to provide a clean RF output of up to +19dBm at 2403MHz. Local oscillator rejection at either 1968 or 2256MHz is close to -50dBc

EME227-13CM KIT Description:

The EME227-13CM is a High performance Transverter for the 2.3GHz 13cm band. The design uses low cost FR4 PC board material and takes around 3 hours to construct. The Transverter is designed as a transmit up, and receive down converter with a fixed frequency range of 2300 to 2390MHz, and is suitable for either a 147 or 435MHz Transceiver. A large number of SMD components are used to make the design compact in size, and reproducible in performance. Modern PHEMT devices along with SAW filters, a +7dBm Mixer and Gali amplifiers are used, and an onboard 5 watt dummy load and RF sensing is used to allow the direct connection of a 5Watt 147 or 435MHz Transceiver. The receiver uses an Broadcom / Avago MGA86563 PHEMT amplifier with a measured 2.5dB noise figure that is very good for terrestrial use, and a suitable mast mounted low noise preamplifier could be used if required. The transmit output uses a Gali-84 amplifier to provide a clean RF output of up to +19dBm at 2320MHz. Local oscillator rejection at either 1885 or 2173MHz is close to -50dBc

EME227-23CM KIT Description:

The EME227-23CM is a High performance Transverter for the 1.2GHz 23cm band. The design uses low cost FR4 PC board material and takes around 3 hours to construct. The Transverter is designed as a transmit up, and receive down converter with a fixed frequency range of 1285 to 1340MHz,, and is suitable for a 144MHz Transceiver. The frequency range cannot be changed for use under 1285MHz due to the use of SAW filters. A large number of SMD components are used to make the design compact in size, and reproducible in performance. Modern PHEMT devices along with SAW filters, a +7dBm Mixer and Gali amplifiers are used, and an onboard 5 watt dummy load and RF sensing is used to allow the direct connection of a 5Watt 144MHz Transceiver. The receiver uses an Broadcom / Avago MGA86563 PHEMT amplifier with a measured 2.5dB noise figure that is very good for terrestrial use, and a suitable mast mounted low noise preamplifier could be used if required. The transmit output uses a Gali-84 amplifier to provide a clean RF output of up to +20dBm at 1296MHz. Local oscillator rejection at either 1152MHz is better than -50dBc.

EME227-23CM-Rev2 KIT Description:

The EME227-23CM-Rev2 is an updated Kit that uses SAW filters to cover the entire 23cm 1240 to 1300MHz band. The design is similar to the original EME227-23CM Kit description above, but uses a BGU8051 as a receive amplifier. The receive gain is now reduced to around 25dB maximum, but the noise figure has been reduced to around 0.7dB. There are also minor changes to the RX / TX powersupply switching circuit.

Kit Constructors Alert:

EME227-12CM

1/ There are no alerts for this Kit

EME227-13CM

1/ There are no alerts for this Kit

EME227-23CM

1/ There are no alerts for this Kit

EME227-12CM Kit Notes:

The pictures below show the basic constructed Transverer 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. Construction is quite straight forward with no tuning required due to the use of SAW filters. The only adjustment required is the RX gain trim pot to suit the receiver being used, and the TX gain to set the required RF output on 2403MHz BUY THIS PRODUCT

EME227-13cm Top View
Top view of the EME227-12cm

The picture shows the basic EME227-12cm Kit with SMA connectors that have been used for low loss.

EME227-13cm Bottom View
Bottom view of the EME227-12cm

The picture shows the 5 Watt 51ohm resistor that is part of the attenuator when using up to 5 watts on either 147 or 435MHz.

EME227-12CM Performance Tests:

EME227-13cm-RXGAIN-S21
EME227-12cm S21 RX amplifier frequency response of the SAW filters and amplifier gain from the RX input to the mixer input. Add 10dB to the gain figures.
EME227-13cm-TXMIX-S21
EME227-12cm Plot showing the TX output from the mixer when using a 147MHz transceiver and 2256MHz L/O
EME227-12CM-TXOUT2-S21
EME227-12cm TX output from the Gali-39 after a single SAW filter showing the requirement for more filtering before the Gali-84 output when using a 1128MHz EME193 PLL and EME228 multiplier
EME227-12CM-TXOUT1-S21
EME227-12cm TX output from the Gali-84 showing the very good L/O rejection due to the second SAW filter and lower harmonic output due to the high 1dB compression of the Gali-84.

EME227-23CM Kit Notes:

The pictures below show the basic constructed Transverer 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. Construction is quite straight forward with no tuning required due to the use of SAW filters. The only adjustment required is the RX gain trim pot to suit the receiver being used, and the TX gain to set the required RF output on 1296MHz BUY THIS PRODUCT

EME227-23cm Top View
Top view of the EME227-23cm

The picture shows the basic EME227-23CM Kit with SMA connectors that have been used for low loss.

EME227-23cm Bottom View
Bottom view of the EME227-23cm

The picture shows the 5 Watt 51ohm resistor that is part of the attenuator when using up to 5 watts on 144MHz.

EME227-23CM Performance Tests:
EME227-23cm-RXGAIN-S21
EME227-23cm S21 RX amplifier frequency response of the SAW filters and amplifier gain from the RX input to the mixer input.
EME227-23cm-TXMIX-S21
EME227-23cm Plot showing the TX output after the first SAW filter from the mixer when using a 144MHz transceiver and shows the 1008MHz image and 1152MHz L/O that requires further filtering out
EME227-23CM-TXOUT1-S21
EME227-23cm TX output from the Gali-84 showing the very good L/O and image rejection, but is a bit marginal with the second harmonic only being 33dBc. Most Antennas and Power amplifiers are quite narrow band so should reduce the harmonic further so this is not an issue.

Kit Changes and Repairs:

PC Board Changes

Kits have been supplied with 3 different types of PC boards that have the following changes etc.

EME227-Rev1.1 Board was supplied with a high quantity of 12 and 13cm band kits and a low number of 23cm Kits. This board supports the MGA86563 MMIC for IC1 and has a BCX54 for T2.

EME227-Rev2.0 Board was supplied with a low number of 23cm Kits. This board supports the BGU8051 MMIC for IC1 and has a BCX54 for T2.

EME227-Rev2.1 A New PC Board has been developed which supports the BGU805x MMIC for IC1 and has a FDN338P for T2.

EME227-12CM

1/ For issues with not being able to adjust the TX or RX gain make sure that trim pots VR1 and or VR2 are correctly soldered especially the ground connection.

EME227-13CM

1/ For issues with not being able to adjust the TX or RX gain make sure that trim pots VR1 and or VR2 are correctly soldered especially the ground connection.

EME227-23CM

1/ This Kit has been updated in June 2020 with a new PC board design EME227-Rev2.1, that now uses a BGU8051 amplifier for IC1.

2/ This Kit was updated in July 2019 and is now supplied with SAW filters that cover the entire 1240 to 1300MHz band.

3/ For issues with not being able to adjust the TX or RX gain make sure that trim pots VR1 and or VR2 are correctly soldered especially the ground connection.