|Unit assembly - second batch.....|
The converter was designed to fit within an Eddystone 29830-P die-cast housing, which is 120x95x30mm. This is available through RadioSpares (343899), Maplin (N90BQ) or Farnell (301530).
A drilling template, in pdf format is available here.
(click on either drawing for full size image)
Standard build does not include Ref I/P
up the dc leads to the
supply socket and fit to the box (two red leads, one 100mm long, the
other145mm and a black lead 65mm long). Solder the negative lead to the
MHz multiplier pcb as shown in the opening picture (rh side) just use
one of the ground holes provided for the 450 MHz O/P connector (which
is never fitted).
The two positive leads can be pushed into the +ve supply holes on the two pcbs.
not already fitted,screw the aluminium bracket, shown opposite,
to the pcb using 2 M2.5 x 6 pan head
If making this bracket yourself, use a 40mm length of 1/4 inch square section stock, drilled 2.3mm as
shown and tap M2.5 mm. The shorter spacing is 20mm, whilst the longer is 30mm.
pipe cap cavities have already been pre-tuned, and should only require
a final tweak at this stage.
Simply apply 12v to the power socket and feed the x23 multiplier output into a spectrum analyser, however, you may need to use the analyser on its most sensitive setting, and with the bandwidth reduced down to the minimum practical value.
Peak the output by making small adjustments of a fraction of a turn on both cavity screws. With both cavities peaked, the output should be about -40 dBm.
Once aligned (and the lock nuts tightened), the board assemby can be screwed into the main housing.
If making your own pipe cap assemblies, try to pre-tune them also prior to soldering. It is easy to make a jig with two pobes projecting through by 1mm or so Tune for a peak with the cavity held down to the jig by hand.
|LNB fixing screws
If an LNB is going to be fitted as part of the unit assembly, fit the two M2.5 x 10 provided through the two non countersunk holes. Note that one nut per screw is used to secure the screw to the box the 40mm mounting clip is a snug fit over this nut. The clip is secured using the second nut and the M3 washer