Phasing Rx front-end construction notes
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Drill all 0.6 mm holes (wire links and ground through-hole links. 

Drill all 0.8 mm holes (all holes apart from power and I/O pads). 

Drill all 1 mm holes (power and I/O pads). 

Drill four 3 mm mounting holes. 

Identify all the ground connections (pink) between the bottom layer
and the ground plane on a printout of the PCB layout (0.6 mm dia. holes).
Mark them with a cross on the printout. There are 16 of them. 

Using 0.375 mm (28 swg) tinned copper wire insert and solder links
(like microwave 'Z' wires) in each position. As you solder each one,
circle it on the layout. 

Check carefully that you have inserted all 16 links, and that they
are in the correct positions. 

Countersink all the remaining holes on the ground-plane (top layer)
of the PCB. 

Insert and solder the six wire links (red) on top of the board.
Use insulated 0.375 mm tinned copper wire. Check each link to make sure
that it isn't shorted to the ground plane.

Install terminal pins.

Install Q2, ensure orientation is correct.

Install R4, R5, R6 and R7.

Install C3, ensure orientation is correct.

Apply +12V to the supply input

Check voltages round Q2 are correct.

Remove +12V supply

Install Q1, ensure orientation is correct.

Install R2 and R3.

Install C4, ensure orientation is correct.

Apply +12V to the supply input

Check voltages round Q1 are correct.

Remove +12V supply

Install Q3, ensure orientation is correct.

Install R8, R9 and R10

Install C6, ensure orientation is correct.

Apply +12V to the supply input

Check voltages round Q3 are correct.

Remove +12V supply

The amplifier may now be tested. Apply 12 V to the amplifier with a
couple of temporary connections, and check that it works, with a
suitable AF source, connected temporarily, also. If there is a problem,
find the fault and rectify it. 

Install IC1, the TUF-1 mixer. Ensure its orientation is correct. 

Install C1 and C2, the large metallised poly capacitors. 

Install L1 and L2. 

Check carefully with a magnifier for solder bridges and shorts.

The unit may now be tested. Connect a suitable audio amplifier to
the output, with a signal generator (ideally +7 dBm) connected to the
oscillator input, and a short antenna connected to the RF input. Some
transmissions should be audible when tuning the signal generator around
the various bands. 7 MHz after dark should produce plenty of signals.


