Our buffer interface named IFace can be used to add an SDR panadapter to the Kenwood TS-870S.
The operations to be carried out are really very simple, it is sufficient to obtain from its wiring diagram the information on the points where to take the RF signals. In this case, in fact, we will not pick up the IF signal because this radio has such an architecture that the IF frequency is not constant but varies as the working conditions vary. So what we will get is a replica of the signal arriving from the antenna, suitably filtered by the band filters. The frequency that we will tune with our SDR receiver will be the same as that of the radio and not that of the IF. The following image shows the block diagram of the radio and where to take the IF signal.
The following images show the exact points in the wiring diagram where to take the RF signal, power supply and PTT. This is required to limit the RF signal entering the SDR panadapter during transmission.
The points on the PCB where to connect the IFace board are shown below: the RF signal, the power supply and the PTT are required: do not forget the return to GND of the power supply (which can also be obtained from the coaxial connector if in contact with the radio chassis).
The use of the PTT signal is required in order to disable the buffer as the SDR receiver will be tuned to the same transmission frequency and it is therefore necessary to protect it from signal excesses.
In order to buy an IFace use the buttons 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.
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