Connecting the RG174 cable to the PCB
The connection point is the 455kHz FL901 filter. This provides
bidirectional (RX and TX) connectivity of the IF. If the transceiver is in RX
mode the 455kHz IF can be extracted from this port and if it is in TX mode
and a 455kHz signal is inserted, the radio will up-convert it and send it to
the TX PA.
A 10n ceramic capacitor is connected to the left top pin of the FL901 filter.
This capacitor is connected to the center conductor of the RG174 coaxial
cable. The ground for the shield is connected to the lower (in center)
ground connection of the filter. When the DSP is placed back on the PCB,
this capacitor has to clear the rim of the DSP shield. Replace the two
screws that hold the DSP assembly and tighten them.
Routing the cable and reassembling of the transceiver
The RG174 routes on the left side underneath the DSP assembly. If the
coaxial cable is routed outside where the antenna tuner plug used to be, a
tie wrap is needed to secure the cable to prevent pulling.
If the SMA connector is mounted on the enclosure, the cable shield has to
be soldered to the shield for the RG45 (rear mic.) connector.
Before the lid is placed back, the speaker needs to be plugged in.
Connection of the LIF converter (RX-only)
The LIF RX output of the transceiver connects to the IN port (TB1) of the
LIF assembly and the audio Line out (TB3) connects to the tip line-in of
the sound card. TB2 provides power (+12V). TB5 is not used for the RX-
only version. A jumper has to be placed on TB4 between 3-4 to by pass
the 7kHz high pass filter or between 4-5 to enable it.
