Start
by fitting the input probe.
This is a short length of semi-rigid coax inner, and is supplied cut to
length. It fits through a plated-through hole (the plating-through
providing the outer conductor as it passes through the board).
The
ptfe sleeve is an interference fit, but if for some reason it has been
pushed out of the hole, beware that it may be harder to fit with the
inner probe wire fitted, so in this case, remove this and insert the
ptfe first – then push the probe wire back through the sleeve.
Once the probe is fitted, ensure that its ptfe shoulder is flush with
the non-cavity side of the board, and then solder the shotkky diode
pair (D70) into place, soldering the common lead to the probe first,
before soldering the two ground pins
Fit the sma bulkhead socket to the 70mm length of output coax, and
prepare the other end so that, say 5mm, of inner is exposed. Likewise
expose 5mm of inner at each end of the cavity-to-cavity coax lead, and
bend into a 'U' shape with 10mm spacing between centres. Push the coax
cables through the board holes as below, and ensure that the coax outer
extends 1mm through the board. Solder the coax outers to rhe board.
Ensure that the 'U' shaped coax ends are vertical to the board when
fitting - this will enable the outer of the coax to push easily through
the pcb hole without snagging, which tends to thicken it and cause it
not to fit.
Finally, cut back the 5mm exposed inner core to 1mm, as per the rest of
the pic above. Where
supplied, the coax's have already been trimmed to length, both in
overall length and exposed probe length.
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