SDR interface for the TS-450S and the TS-690S

These are the instructions to install the IFace interface inside of the Kenwood TS-450S/690S. The installation is very easy.

IFace 2

The TS-450S/690S, like other radios, has a fairly complex configuration and uses different intermediate frequencies. We are interested in the first, the “wide band” one, the one before the main band pass filter (the roofing filter so to speak). The sequence of operations to be performed in order to obtain a sufficient bandwidth to realize a panoramic receiver around the chosen IF frequency is shown below. The signal path for TX and RX are fairly separated, so to use the PTT command to disable the IFace during transmission is not required. The following images show the point where the IF signal will be taken.

Block diagram of the TS.-450S
Bloc diagram of the 1° mixer

Let’s start by analyzing the wiring diagram. We have to find the first mixer and where to take the power supply. From the following image everything will appear clear.

Electric diagram of the 1° mixer

At this point we have to locate the points where we connect the electric cables to the IFace. The following image shows where to take the various signals.

Layout of the RF UNIT

This last image shows the RF UNIT and where the IFace interface is to be connected.

Picture of the RF UNIT

If you like the idea and the goodness of the proposal buy an IFace using the button below.


ATTENTION: Though installing the IFace is not difficult, you do this at your own risk. TSP S.r.l. is not responsible for any damage, unwanted side-effects or whatever.

For more information do not hesitate to write us.
Have fun!

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