Ramsey Electronics FZ-146 Specifications download pdf (Page 75)

FX-146 • 75

 A13. Install C2, .001 uf disc capacitor. It may be marked .001 or 1 nf or

102. (102 means a one, a zero and two zeros which equals: 1000 pf.

1000 pf is the same as .001 uf. This notation (102) is similar to the

resistor color code to indicate resistance values.

 A14. Install C3, .001 uf.

 A15. Install C4, .001 uf.

 A16. Install C1, .001 uf (Don't confuse with C65).

 A17. Install C65, .1 uf. It may be marked .1 or 104. (As above, 104

means a one, a zero and four zeros = 100,000 pf which is the same

as .1 uf) (On the schematic, C65 is located near J4 and U4 and couples

packet audio to the microphone input line.)

 A18a. Select D9, one of the many 1N914 or 1N4148 switching diodes

used in the circuit. Don't confuse these diodes with the smaller PIN and

varactor diodes used in later stages. Notice the dark band at one end

designating the cathode and notice how the cathode end is imprinted

right on the PC board.

 A19. Install D9 paying attention to the orientation of the banded end.

 A20. Install R42, 2.2K (red-red-red). This is an "upright" installation like

D18, previously installed.

Almost all resistors will be installed this way. Like C65, R42 and D9 are

shown near J4 on the schematic and complete the External PTT connection

between U4 and J1.

No testing of the Packet components is required, but make sure all parts

values are correct and that D9 is oriented correctly.

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Ramsey Electronics FZ-146 Specifications Page 75