Ramsey Electronics FZ-146 Specifications download pdf (Page 15)

FX-146 • 15

1. PRIMARY CONNECTIONS:

PWR (near L20): +12-15 volts DC from S1.

GROUND: - DC from battery or power supply.

SPEAKER: both connections near C37

MIKE: both connections (IN & GND) near notched end of U1.

SQUELCH: two connections marked CW and W near C18

VOLUME: three connections marked IN, OUT, GND.

ANTENNA: Center of SO-239 connected at "RF OUT" near C71.

CHANNEL SWITCH: Row of holes numbered 1 through 12. The switch

wiper (moving contact) is wired to +5V near "1."

EXT AUDIO: must be jumpered per options to enable pin 4 of J1.

2. TEST POINTS:

+12V, +8V, +5V, +8R, +8T permit checking for presence of those voltages.

+8R = Receive mode. +8T = Transmit.

TP1: For checking of VCO control voltage during alignment.

TP2: For checking VCO frequency with counter.

TP3: For checking U3 prescaler output with counter.

R103: +7VDC at top lead shows locked PLL. 0 volts = problem.

3. OPTIONS:

+12V, GND, +8V, +5V, +8T, +8R: provide supply voltage for accessories or

modifications designed by you. +5V is available both near L1 and near

C102. +8T and, +8R are near Q13, Q14.

Jumper Options for Packet Operation: SPKR to EXT AUDIO: Speaker level

audio for packet (J1). DISC to EXT AUDIO: FM discriminator output for

packet.

COR: "Carrier Operated Relay" output from U1.

PL: Input point for audio tones (DTMF, CTCSS, etc.)

Binary Programming Holes: The row of holes alongside the Binary

Programming labels permits installation of ribbon cable for external

programming devices designed by the innovative amateur radio community.

switches or interfaces, or a row of internal DIP switches.

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Ramsey Electronics FZ-146 Specifications Page 15