Elecraft KTCXO3-1 - Manual

Elecraft
 www.elecraft.com P.O. Box 69  Aptos, CA 95001-0069 (831) 763-4211  Fax: (831) 763-4218
E LECRAFT

K3
I n s t a l l i n g t h e K T C X O 3 - 1 T C X O
Revision F1 – December 16, 2013
Copyright © 2013, Elecraft, Inc; All Rights Reserved
The KTCX03-1 is an optional ±1 ppm (± 0.5 ppm typical) temperature-compensated crystal oscillator that
replaces the standard crystal oscillator on the K3 Reference Oscillator board.
Contents
The kit components are as follows:
1. KREF3 TCXO Oscillator Module, 49.380 MHz.
2. Insulator (rectangular, fits bottom of TCXO module)
3. Tie wrap.
Tools Needed
You will need a Phillips screwdriver and cutters to trim the tie wrap. Long nose pliers are handy for installing the
tie wrap. A wrist strap grounded through a 1-megohm resistor is strongly recommended to protect your K3 from
ESD damage.
Installation Procedure
Disconnect power and all cables from your K3.
Remove the top cover as shown in Figure 1. After the cover is open, lift it gently to reach the speaker wire
connector. Unplug the speaker then set the top cover aside in a safe place.
1 2 REMOVE
9 SCREWS
HOLDING TOP
COVER.
TO OPEN COVER,
PRESS HERE TO
TILT FRONT EDGE UP
DO NOT
REMOVE THE
FOUR SCREWS
AT THE CORNERS
OF THE SPEAKER
OPENING.
1
2
3
4 6
7
8
9
OR
PLACE UNIT
ON ITS SIDE FEET,
THEN TIP FARTHER
SO THE TOP COVER
SWINGS OPEN.
Figure 1. Removing the Top Cover
CAUTION:
Touch an unpainted metal ground or wear a grounded wrist strap before
touching components or circuit boards inside the K3.
Locate the KREF3 circuit board. It is mounted against the metal shield running across the width of the K3
near the front panel (see Figure 2).
Cut and remove the tie wrap holding the oscillator module in place. Notice how the tie wrap runs under the
socket to hold the module. In a later step you’ll need to install the new tie wrap in the same manner.