EME195 Series Receive Bias Tee

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EME195 PC Board Description:

The EME195 Series RX bias tee ( DC Power Injector ) Kits are suitable for powering Receive Preamplifiers from 0.5MHz to 2GHz via a coaxial cable. There are currently three Kits to suit frequency ranges from 0.5 to 100MHz ( EME195H ), 30 to 500MHz ( EME195V ), and 300MHz to 2GHz ( EME195U ). All have been optimized to cover each specific band, for the lowest loss and return loss.

The board is fitted with reverse polarity and PTC protection to safeguard against any short circuits on the RF/DC output connection with a maximum DC voltage and current of +25vdc @ 160mA. The design uses SMD Inductors and capacitors that have been optimized for the lowest RF return loss across the bands.

Kit Constructors Alert:

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EME195 KIT Notes:

The Kit is quite straight forward to construct, and a pre wound SMD inductor is now used compared to a Toroid on the previous EME181 bias Tee Kits. All three Kits are similar to the pictures below and only the value of the inductor and capacitors are different. The SMA connectors need to be soldered on both sides of the board for the bests grounding and return loss. BUY THIS PRODUCT

EME195U Top View
The picture shows the built EME195 board Kit U for 300MHz to 2GHz
EME195U Module Board
The picture shows the built EME195B-M Module board for 300MHz to 2GHz
EME195V Enclosure View
The picture shows the built EME195V-ENC for 30MHz to 500MHz
EME195U Enclosure View
The picture shows the built EME195U-ENC for 300MHz to 2GHz
EME195h-S11
EME195H S11 return loss with the bias tee terminated into a 50ohm load showing a wide operating frequency range of 0.5 to 100MHz.
EME195H-S21- Through Loss
EME195H S21 through loss showing that it is usable from at least 0.1 through to 100MHz.
EME195V-S11
EME195V S11 return loss with the bias tee terminated into a 50ohm load showing a wide operating frequency range.
EME195V-S21- Through Loss
EME195V S21 through loss showing that it is usable from at least 30MHz through to 1GHz.
EME195U-S11
EME195U S11 return loss with the bias tee terminated into a 50ohm load showing a wide operating frequency range.
EME195U-S21- Through Loss
EME195U S21 through loss showing that it is usable from at least 150MHz through to 2GHz.

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 requirement are a drill press, Vice, M1.5, M3, M8, and 1.4 inch drill bits, metal punch, hammer, and steel ruler.

EME195-Encl-1
EME195U-ENC Mounted in a Hammond 1590H Enclosure
EME195-Encl-2
Alignment for drilling the 1/4" holes for the SMA connectors, and the 2.1mm DC connector
EME195 In A Hammond 1590H Enclosure
Shows a completed EME195V Bias Tee

Mounting Procedure:

There can be some variations with connectors, and mounting hardware thicknesses that may require some experimentation when mounting boards into enclosures.

  • Construct the PC board as per the EME195 Kit construction notes but DO NOT fit the SMA connectors to the board. Connect a short 10cm length of Red hookup wire to the power connection on the bottom side of the board.

  • Carefully mark and drill the two 6.5mm, ( 1/4" ) and single 8mm holes in the die cast enclosure as shown in the picture above.

  • Loosely fit the two SMA49 connectors to the enclosure in a position that will allow the PC board to be slid between the guides on the rear of the connectors.

  • Turn the PC board and SMA connectors in the enclosure until the board sits in its normal horizontal position. Very lightly tighten the SMA connectors, and then align the connector pins carefully with the PC board strip lines.

  • Solder the top of the PC board to the two SMA connectors, and then loosen the nuts on the connectors and rotate the board 180 degrees in the enclosure. Solder the SMA connectors to the bottom ground plane side of the board.

  • Realign the PC board in the enclosure in its final position, and then firmly tighten both nuts on the SMA connectors.

  • Fit the 2.1mm DC socket to the enclosure. Solder the Red power from the board to the DC connection lug on the rear of the DC socket. The wire should be routed under the board so that it does not affect the RF operation of the circuit.

  • This concludes the construction of the complete boxed Kit which can now be tested.

  • Please note that when tightening up the nuts on the SMA connectors, to be careful not to twist the PC board which could crack the SMD components. When connecting cables to the sockets, only do up hand tight to avoid twisting the connectors that could place strain and twist the PC board.

Product Changes and Updates:

EME195 KIT

1/ There are currently no changes to this Kit