Ramsey Electronics FZ-146 Specifications download pdf (Page 134)

FX 146 • 134

 TX26: C58, the last .1 uf capacitor.

 TX27: C59, .001 uf.

 TX28: L13, 1.5 turn hand-wound coil. Review "TC" and TX16.

 TX29 C73, 18 pf.

 TX30: C55, .01 uf.

 TX31: C74, 35 pf trimmer.

 TX32: C84, 35 pf trimmer.

 TX33: C64, .001 uf.

 TX34: L8, 2.2 uH molded inductor (2 red, 1 gold and 1 black stripe).

At this point, every single main PC board component has been installed

except for L10, R32 and L9, which apply power to the RF output transistors

(driver Q9, final Q8). DO NOT INSTALL these parts until instructed to do so

during the Transmitter Completion and Tuneup procedure.

Stage TX: FINAL PROGRESS CHECK:

1. Double check component selection for Steps TX.

2. Use bright light and magnifier to go over entire board to check for

missed connections or solder bridges. If you suspect a solder bridge,

simple review the X-ray illustrations to see whether the points in

question are indeed tied together.

3. Carefully check entire board for:

A. Loose bits of wire lodged among connections or components on

either side of board.

B. Excess wire lengths which may not have been nipped and are now

bent flat, probably against another connection.

BUILDING THE LOW PASS FILTER PC BOARD:

The assembly of the low pass filter PC board is quite different from the way in

which you have assembled the main FX transceiver board. Component parts

are mounted on the circuit trace/solder side of the board! The reason for this is

that the board mounts against the output connector - and it would be very

difficult to solder the connector center pin after the board is mounted to it.

You'll see why as you finish building your rig.

When installing parts, insert the component on to the PC board from the

solder side, the leads will extend out through the bare side of the board with

no traces. The part is then soldered on the solder side and the leads trimmed

away flush on the other side. When soldering the disc caps, be sure that their

leads are properly soldered, sometimes the body insulating material will coat

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Ramsey Electronics FZ-146 Specifications Page 134