Ramsey Electronics FZ-146 Specifications download pdf (Page 90)

FX 146 • 90

STAGE DR ASSEMBLY:

Be very attentive to capacitor values (in picofarads) and to coil descriptions

throughout this section.

 DR1. Correctly identify and install PIN diode D6. It is the only BA479

used in the circuit, and its number is stamped plainly on the diode body.

Be sure to orient the cathode end correctly!

 DR2. Install L17, 2.2 uH in upright position with the inductor's body in the

designated hole. This is a molded inductor, resembling a resistor but is

larger. Look for 2 red bands on its body.

 DR3. Because it must dissipate slightly more power, resistor R54 is

larger than most of the resistors used in this circuit. Its value may be 200

or 220 ohms (red-black-brown, or red-red-brown). Install R54 in upright

style.

 DR4. Install C47, 100 pf (marked 100 or 101).

 DR5. Install R28, 470 ohms (yellow-violet-brown).

 DR6. Install C25, 100 pf (marked 100 or 101).

 DR7. Install C27, 8.2 pf disc (marked 8.2).

 DR8. Install D4, type 1N914 or 1N4148. Orient the cathode band

correctly.

 DR9. Install C53, .01 uf disc capacitor (marked .01 or 103).

 DR10. If you think that transistor Q3, type NE021,

is tiny, wait until you install C75, the SMT

(Surface Mount Technology) or "chip" capacitor

at Q8, the Transmit Final Amp! Study the drawing

and Q3 itself before removing the device from its

protective paper.

 DR11. The longest of the three leads is the

collector, which points to R12, as pictured.

Remove Q3 from its adhesive paper, bend all three leads down 90

degrees, and insert as illustrated.

 DR12. After making sure that the body of Q3 is snugly against the PC

board and correctly oriented as shown above, solder and trim all three

wires. That's all there is to it!

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Ramsey Electronics FZ-146 Specifications Page 90