EME162 Series Kits

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EME162 Description:

The EME162 PC board was updated February 2014 to include mounting pads for a SMD voltage regulator on the bottom of the PC board. The EME162 PC board was designed to construct amplifier gain blocks for various applications using the Mini-Circuits MAR, ERA, and Gali MMIC amplifiers. Is it also suitable for most other x pack and SOT-89 packages that have the same lead pin outs. A simple 10 to 30MHz multiplier Kit was also developed in mid 2010 to suit the locking of Icom IC910 transceivers to either a GPS or Rubidium reference.

One of the most popular Kits was the EME162-1200 0.5 Watt 1200MHz amplifier Kit using the Avago ATF50189 PHEMT, that can be used as a driver amplifier for the 23cm band. This Kit is no longer available due to the ATF50189 being obsolete.

Mini-Kits stock a number of Wide band Amplifier Kits using the Mini-Circuits amplifiers which can be used as receiver or transmitter driver stages for various projects. There is little difference with gain between many of the devices, with some having a lower noise figure or can produce more output power @ 1dB compression. The GALI-39 KIT, PGA-103 KIT and PHA-1 KIT are suitable as wide band Pre-amplifiers for use with scanning and communications receivers, while the GALI-74 KIT, GALI-84 KIT, MGA31189 KIT, and PHA-1 KIT make very good low distortion transmitter driver stages.

Kit Constructors Alert:

1/ There are no current alerts for any of the EME162 Kits.

GALI-39 Kit Notes:

The GALI-39 device is ideal as low level receiver or transmitter gain block amplifier from 500kHz to at least 7GHz. This Kit is supplied with components to suit 3 frequency ranges from 500kHz to 4GHz to get the maximum gain from the device. A 78M05 voltage regulator mounted under the board allows operation between +7 to +15vdc. BUY THIS PRODUCT The built version of this product has been replaced with the Mini-Kits GALI39-R2

  • GALI-39 Kit Top View
    The picture shows the basic GALI-39 Kit set up for receive applications without the optional attenuator fitted.
  • GALI-39-L1-S22
    GALI-39 KIT Low Frequency Version 0 to 3MHz
  • GALI-39-L2-S22
    GALI-39 KIT Low Frequency Version 2MHz to 1GHz
  • GALI-39-M1-S21
    GALI-39 KIT Mid Frequency Version 0 to 50MHz
  • GALI-39-M2-S22
    GALI-39 KIT Mid Frequency Version 0 to 2GHz
  • GALI-39-H1-S22
    GALI-39 KIT High Frequency Version 0 to 4.4GHz
GALI-74 Kit Notes:

The GALI-74 device is ideal as low level receiver or transmitter gain block amplifier from 500kHz to at least 2GHz. This Kit is supplied with components to suit 2 frequency ranges from 500kHz to 2GHz to get the maximum gain from the device. A 78M08 voltage regulator mounted under the board allows operation between +9 to +15vdc. Built versions can be ordered to suit 2 different frequency ranges, and the GALI-74 mounted to suit either a receive or transmit applications. BUY THIS PRODUCT

This Kit is not available as a built product.

  • GALI-74 Kit Top View
    The picture shows the basic GALI-74 Kit without the optional attenuator fitted.
  • GALI-74-L1-S22
    GALI-74 KIT Low Frequency Version 0.1 to 60MHz
  • GALI-74-L2-S21
    GALI-74 KIT Low Frequency Version 50MHz to 2GHz
  • GALI-74-M1-S21
    GALI-74 KIT Mid Frequency Version 30MHz to 2GHz
GALI-84 Kit Notes:

The GALI-84 amplifier is particularly suitable as a transmitter gain block due to the high gain requiring only around -5dBm to produce over +20dBm output. When the input is driven to produce +10dBm output, the amplifier produces very low harmonic output. This amplifier is also suitable as a post mixer amplifier for transmitters and receivers, or a frequency multiplier. This Kit is supplied with components to suit 3 frequency ranges from 500kHz to 4GHz to get the maximum gain from the device. A 78M08 voltage regulator mounted under the board allows operation between +9 to +15vdc. BUY THIS PRODUCT

The built version of this product has been replaced with the Mini-Kits GALI84-R2

  • GALI-84 Kit Top View
    The picture shows the basic GALI-84 Kit without the optional attenuator fitted.
  • GALI-84-L1-S21
    GALI-84 KIT Low Frequency Version 0 to 3MHz
  • GALI-84-L2-S21
    GALI-84 KIT Low Frequency Version 0 to 60MHz
  • GALI-84-M1-S21
    GALI-84 KIT Mid Frequency Version 0 to 50MHz
  • GALI-84-M2-S21
    GALI-84 KIT Mid Frequency Version 500MHz to 2.5GHz
  • GALI-84-H1-S21
    GALI-84 KIT High Frequency Version 0 to 4.4GHz
MGA31189 Kit Notes:

The MGA-31189 amplifier is ideal as high gain 0.25W driver amplifier, or a low noise high dynamic range amplifier for use between 50MHz and 2GHz. The amplifier has quite a flat gain response from 100MHz to 1300MHz. As a driver amplifier the MGA31189 produces an output between +23 to +24dBm @ 1dB compression from 100MHz to at least 2GHz. A 78M05 voltage regulator mounted under the board allows operation between +7 to +15vdc. BUY THIS PRODUCT

The built version of this product has been replaced with the Mini-Kits MGA31189-R2

  • MGA31189 Kit Top View
    The picture shows the MGA31189 Kit with optional SMA connectors. The MGA-31189 is placed near the output of the board for use as a high gain TX driver amplifier. An optional attenuator can be used on the input if required.
  • MGA31189-L1-S21
    MGA31189 KIT S21 Low Frequency Response
  • MGA31189-H1-S21
    MGA31189 KIT S21 High Frequency Response

PGA103 Kit Notes:

The PGA-103 amplifier is ideal as a very low noise high dynamic range amplifier for use between 100MHz and 1.3GHz. It has however a very steep roll off of gain between this frequency range mainly due to the PGA-103 characteristics. As a driver amplifier the PGA-103 produces an output between +20 to +23dBm @ 1dB compression over this frequency range. A 78M05 voltage regulator mounted under the board allows operation between +7 to +15vdc. BUY THIS PRODUCT

The built version of this product has been replaced with the PGA103-WB-R2

  • PGA-103 Kit Top View
    The picture shows the basic PGA-103 Kit. The PGA-103 is placed near the input of the board for a very low noise figure amplifier. An optional attenuator can be used on the output if required.
  • PGA-103-L1-S21
    PGA-103 KIT S21 Low Frequency Response
  • PGA-103-H1-S21
    PGA-103 KIT S21 High Frequency Response
PGA-103 2M Band RX Preamp:

The PGA-103 amplifier is ideal as a very low noise high dynamic range amplifier for use between 100MHz and 1.3GHz. The amplifier can be modified to cover a narrow band giving some rejection by adding a T type input filter to the input of the EME162 board. The application below is an Ultra Low noise 2M band 144-148MHz Preamplifier that has a measured 0.55dB noise figure and 24dB gain @ 144MHz. A 78M05 voltage regulator mounted under the board allows operation between +7 to +15vdc.

This Kit is not available as a built product

This built version of this product has been replaced with the PGA103-2M-R2 Amplifier.

  • PGA-103-2m Top View
    The picture shows the PGA-103 Kit modified as a Ultra low noise 2M band 144 to 148MHz Preamplifier. A low loss T input filter effectively gives some rejection of out of band signals.
  • PGA-103-2m-S21
    PGA-103-2M T Filter Frequency Response and S21 Gain
PHA-1 Kit Notes:

The PHA-1 amplifier is particularly useful as an amplifier for complex RF waveforms, or as a low noise high dynamic range gain block in a receiver. The amplifier is supplied with components to suit a frequency range of 90MHz to 1GHz, and 400MHz to 1.6GHz. The lowest frequency is limited to around 200MHz due to the internal 50ohm matching, and produces up to +22.5dBm output at 1GHz. A 78M05 voltage regulator mounted under the board allows operation between +7 to +15vdc. BUY THIS PRODUCT

This Kit is not available as a built product

  • PGA-103 Kit Top View
    The picture shows the basic PHA-1 Kit. The PHA-1 is placed near the input of the board which is then suitable as a high dynamic range receive amplifier, and an optional attenuator can be used on the output if required.
  • PHA-1-M1-S21
    PHA-1 KIT Mid Frequency Version 0 to 100MHz
  • PHA-1-M2-S21
    PHA-1 KIT Mid Frequency Version 50MHz to 2GHz
  • PHA-1-H1-S21
    PHA-1 KIT High Frequency Version 0 to 1GHz
  • PHA-1-H2-S21
    PHA-1 KIT High Frequency Version 1 to 4.4GHz
30MHz Multiplier Kit Notes:

10 to 30MHz x3 Multiplier for GPS locking the Icom IC910 and 9100 Transceivers to a 10.066667MHz GPS or rubidium reference. The Kit uses the GALIi-84 Amplifier Kit and a two section 30MHz band pass filter to produce a very clean and filtered output suitable for locking the Transceiver. Typical output is +5dBm and may require some attenuation to interface with the oscillator circuitry. A 78M08 voltage regulator mounted under the board allows operation between +9 to +15vdc. The pictures below show an earlier version that does not have the on board 8v regulator.

This Product has been confirmed many times as being a successful modification on the IC910. BUY THIS PRODUCT

This Kit is not available as a built product

  • Gali-84-Multiplier-Top View
    Pictures showing the Mini-Kits 10MHz to 30MHz frequency multiplier using the GALI-84 KIT4. The multiplier was designed for locking either the ICOM IC910 or IC9100 to either a Rubidium or GPS reference.
  • Gali-84-Multiplier-Bottom View
    Bottom view showing the toroids mounted onto TO3 insulators for the 30MHz filter. This is an early version of the Kit that does not have the 78M08 regulator on the board.

Tests on the Multiplier showed +9dBm output at 30.2MHz with +10dBm input on 10MHz. Harmonics are -50dBc which is excellent due to the coupled 30MHz band pass filter. A FE-5680A with +7dBm output, produced around +7dBm output at 30MHz. It is expected that only around +5dBm output may be required to lock the ICOM IC910. Mini-Kits has not tested this on an Icom IC910, so it will be up to the constructor to work out how to adapt it to work. We are unable to supply any fitting instructions, or how to program either a Rubidium, or a GPS locked source for the required 10.066667MHz output.

Thanks to Rob VK2GOM for helping with the comments below.

I must admit, I ended up buying two Rubidium's on Ebay before I found one that could be programmed. I have found that those Rubidium units that require a +5vdc input on the DB9 in order to enable the output are not programmable. Those that need only +13.8vdc (spec +15vdc) and ground to get an output are programmable.

The multiplier output is fed into connector pin2 on the PLL board where the CR-293 option would fit. A simple Pi attenuator was used to reduce the multiplier output to around 400mV +5dBm so that it allows the radio PLL to lock. It is not recommended that the trim pot R570 be adjusted as it would affect the radio when not using the Rubidium.

I have fitted a toggle switch on the rear of the Radio that turns off the +5vdc to the TCXO oscillator, ( CR-452 ) on the PLL unit PCB when using the Rubidium, as it was the easiest way to disconnect the TCXO.

EME162-1200-R2 Kit Notes:

The amplifier uses an Avago ATF50189 PHEMT which provides a gain of over 18dB, and an output power of +27dBm ( 500mW ) @ 1dB compression. The PHEMT requires minimal input and output matching to 50 ohms, and is particularly suitable as a driver amplifier for the Mitsubishi RA18H1213G module when used for modes including FM,. SSB and digital. The product requires a regulated +5vdc 500mA power supply for operation. This Product is no longer available due to the ATF50189 being obsolete. Please email Mini-Kits if you need a spare part replacement.

Please Note: that the output power has been amended as recent tests on this amplifier have shown lower output power compared to the prototypes back in 2008. Original prototypes produced up to +29.5dBm @ 1dB compression which has not been able to be reproduced with tests made after December 2014. This could be due to manufacturing changes to the ATF50189, another component, or possibly the PC board material. This amplifier will however consistently produce over +27dBm @ 1dB compression.

This Kit has been discontinued and is not available

  • EME162-1200-R2 Top View
    The EME162-1200 Rev2 showing the optional SMA connectors fitted. Gain is typically +18dB, and power output is +27dBm @ the 1dB compression point.
  • EME162-1200-R2 Bottom View
    EME162-1200 Rev2 showing how the SMA connectors are soldered and also how the heatsink is fitted.
  • EME162-1200-S21
    EME162-1200 Rev2 S21 Frequency Response showing the gain peak in the 1200MHz band and the attenuation of the output filter to 2.6GHz
Mounting into a Die cast Enclosure:

This is for advanced constructors that have experience and access to a workshop with metal working tools. The basic tool requirements are a drill press, Vice, M1.5, M3, M6, and 1.4 inch drill bits, scriber, metal punch, and a hammer.

  • EME162 78M0x Regulator
    Picture shows how the regulator is soldered on the Ver2 board
  • EME162-ENC-1
    Drilling guide for the 1550Q enclosure. Later versions use a 2.1mm DC socket
  • EME162-ENC-2
    M6 shake proof washer washers have been used between SMA connectors and enclosure walls
  • EME162-ENC-4
    Some SMA connectors with a thinner flange will require thicker washers for a tight fit, so this build used flat M6 washers.
  • EME162-ENC-3
    Alignment of the board should be checked very carefully before the connectors are fully soldered to the board
  • EME162-ENC-5
    How to solder the1N4007 Diode from the DC connector to the board.
Mounting Procedure:

There can be some variations with connectors, and mounting hardware thicknesses that may require some experimentation when mounting boards into enclosures. Recently some SMA panel mount connectors may require additional washers due to the female thread not going all the way to the mounting flange. Many of the shake proof washers that are being supplied with SMA connectors are very flimsy and easily deform when tightening, so the use of a M6 shake proof washer can be used to securely hold the SMA connector to the enclosure.

  • Carefully mark the holes that have to be drilled into the Hammond 1550Q enclosure. Drill the 2x SMA39 connector holes to 1/4 inch, 6.35mm, and drill a 8mm hole to suit a 2.1mm DC socket.

  • Fit the 2x SMA39 connector using the 2x M6 flat or shake proof washers as shown in the picture above. The washers are used as shims to space the SMA39 connectors to suit the length of the PC board. Lightly tighten the buts still allowing the connectors to be able to be rotated. This can then place too much strain on the board damaging it by twisting.

  • Cut the SMA centre pins to a length of 3mm so that when the board is fitted, the pins are a reasonable distance from the SMD capacitors on the board strip lines.

  • Any mistakes in this next stage could make damage the board or make it very difficult to recover if it is incorrectly fitted. Fit the PC board to the enclosure carefully sliding it into the connectors at an angle, and then rotate the board until its close to its final position. Slowly tighten the SMA connectors making sure that the rear of the connectors are straight. If these are over tightened, then it will be very difficult to rotate the board in the enclosure after it has been soldered. Align the PC board to line up with the SMA pins, and then tack solder one of the pins making sure that the SMA connector is rotated parallel to the end of the board. Next tack solder the other SMA connectors pin and make sure that the board sits square in the enclosure. Solder the outer flange of the SMA connectors to the top ground plane of the board.

  • Undo the SMA nuts and very carefully rotate the board so that the SMA connectors can then be soldered to the ground plane side of the board for grounding and to increase strength.

  • Solder a length of red hookup wire onto the regulators input connection and route it along the side of the enclosure near the SMA input connector. This will allow the board to then be rotated into its final position without fouling on the wire.

  • Rotate the board to its final position and carefully tighten the SMA nuts making sure to not twist the board. Over tightening could either twist the board, or crack a chip capacitor. It might be worth considering only fitting the capacitor and resistor components at the ends of the board after the board is in its final position.

  • Next fit the 2.1mm DC socket to the enclosure as shown in the picture above.

    Cut the red wire to a suitable length and solder the 1N4007 diode to the wire and fit the heat shrink tubing over the connection. Finally solder the Diode and the 10nF capacitor to the DC socket.

Changes and Updates:

All Kits using the EME162 PCB

1/ Low gain can be cracked chip capacitors on the input or output strip lines that connect to the SMA connectors. There is no easy way to check the capacitors other than replacing them. Also check that the inductor that supplies power to the amplifier device has been fully soldered on both ends to the board.

PGA-103-WB KIT

1/ There have been reports of failure of the PGA-103 when used as a pre-amplifier on an antenna. This is normally always caused by lightning or static damage as this simple design has no input protection, so it is advisable to disconnect antennas during storms to prevent damage. Input protection in the form of either back to back schottky diodes or a limiter diode, could provide some protection but is not guaranteed.

EME162-1200 PA KIT

1/ June 2020 This Kit is now no longer available due to the ATF50189 being obsolete. Please contact Mini-Kits if you need a spare part to repair an Amplifier Kit.

2/ There have been reports of not being able to set the bias current, or the amplifier oscillating when first powered up. This can be due to having a higher gain ATF50189 and the trimmer capacitor being in its initial factory position which tunes the amplifier to very high gain. Turn the power off and turn the trimmer capacitor around a 1/4 of a turn and then reapply power to set the current, then trim the capacitor as per the Kit instructions.

3/ Updated Kit October 2013. / The output trimmer capacitor has been replaced with a fixed 10pF NPO SMD capacitor. It was found that the output trimmer was not required and made it more difficult to tune the amplifier.

4/ Most problems are directly related to low gain are associated with cracked chip capacitors on the input and output of the EME162 PC board.

5/ There have been some reports of the 500ohm trimmer being faulty, but it is suspected that constructors have damaged it by repeatedly adjusting. Mini-Kits has changed the brand of trimmer late 2012 to a better quality type.

6/ There have been reports of the small 4.7nH and 2.7nH being damaged by heat when soldering. Please be careful to not melt the small inductors with large soldering iron tips.

7/ The 15ohm resistor in the bias circuit has been changed to 13 ohms to give the bias trim pot a better range. With the 15ohm, it was difficult to adjust the bias as the trim pot was nearly fully anti-clockwise

8/ Pre October 2013 Kits, Low output power, cannot peak output power, Bad combination of the settings of both trimmer capacitors. Try turning each trimmer 180 degrees, and then try peaking the gain.

9/ Kits after December 2017 have been changed to improve the stability of the amplifier. For some reason that I cannot remember, a 10pF capacitor was used on the output of the ATF50189 to ground. Recent tests show that a 5.6pF is a more suitable as the original Kits had a 6pF trimmer capacitor. So all Kits are now supplied with a 5p6.