Ramsey Electronics FZ-146 Specifications download pdf (Page 137)

FX-146 • 137

This completes the assembly of the low pass filter PC board. Inspect the

board to be sure all leads on the bare side of the board are trimmed neatly

and that the coils do not short against the PC board ground plane.

 TX45. Exactly when to install the SO-239 antenna RF connector is left to

your discretion. If you are using your own case, you must now "wing it"

on your own, observing the way we are mounting the connector to our

case. If you are using the Ramsey CFX case set, mount the SO-239 to

the rear panel as part of this assembly operation. Use the two screws

and four nuts supplied and consult the illustration as needed. The flange

of the connector sits on the outside of the rear panel. Mount the

connector with one set of nuts, then mount the low pass filter PC board

using the other two nuts. Solder the connector center pin to the board.

 TX46. Line up the two ground wires and C63, the .01 uf coupling

capacitor, on the low pass filter board with the mating holes on the main

FX PC board. Allow the low pass board to stand about 1/8" above the

main FX board and at a neat right angle. Solder the leads to the main

FX board, be careful so as to not loosen the solder joints on the little

board from too much heat when soldering - if you do, just retouch the

solder joints again, it's no big deal!

TRANSMITTER COMPLETION AND TUNEUP

Do not proceed with the following until all of the previous steps have been

completed successfully. You now have a somewhat fragile assembly, the

rear panel being held to the main PC board with only three wires, please be

careful during the next few steps.

 TX47. Install L10, an orange wire coil that appears to have 5 turns when

viewed from the top.

 TX48. Install R32, the remaining 1/2-watt 82 ohm resistor. (Larger body:

gray-red-black).

 TX49. Install RF choke L9, reviewing Section "TC" and Step TX15, if

necessary.

 TX50. Connect the following to your transceiver:

• 50-ohm dummy load

• VHF RF wattmeter or voltmeter connected to R115, the stand up

resistor test point on the low pass filter board.

• DC 12 volts power

 TX51. Press (key) the transmit button and alternately adjust C84 and

C74 with a non-metallic alignment tool for maximum RF output indicated

on the meter. If you are using a voltmeter connected to the resistor test

point, you will typically see about 12 to 15 volts when connected to a

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Ramsey Electronics FZ-146 Specifications Page 137