21. Final adjusting the Tx-part of the filter. 

21.1 Connect a 50 ohms terminator to the Rx-port.

21.2 Connect a powermeter and dummyload directly to the Ant-port.

21.3 Connect a 10W VSWR meter DIRECTLY to the TX-port. Connect a transmitter to the VSWR-meter.

21.4 Adjust the transmitter exactly to the downlink-frequency (Tx-frequency of the repeater).

21.5 Tune the "Tx"-finetune-bolts at first for about maximum output, at the same time observing the VSWR. Begin at the "Ant"-side and work backwards to the "Tx"-side.

21.6 Then fine tune for minimum VSWR, at the same time observing the output. Begin at the "Tx"-side, work towards the "Ant"-side.

21.7 Repeat the finetuning to minimum VSWR.

21.8 VSWR should be lower then 1:1.5 (1:1.2), and insertion loss should be abt. 4 dB.

21.9 Lock all tuning-rods with thermal glue (see "cn.gif").


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