Elecraft XG50 - Manual

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E
L E C R A F T
XG50
S I G N A L S O U R C E
R e v D , N o v e m b e r 2 6 , 2 0 1 2
Copyright © 2012, Elecraft, Inc., All Rights Reserved
The Elecraft XG50 is a simple 49.380 MHz signal source specifically designed for use with the KX3 Extended
VFO Temperature Compensation Procedure. Powered from a 12VDC source, the XG50 produces a stable -36
dBm signal.
Specifications
RF Output Level 10 mv p-p (-36 dBm) into 50 ohms
Frequency 49.380 MHz, ±5 ppm
Stability Approximately ± 2 Hz
†
Current Drain Less than 25 ma @ 12 VDC
Operating Voltage 8 – 15 VDC
Size PC board: 2.5"L x 1"W; 3.3"L including BNC connector
Parts Inventory
Ref Qty Description Part #
R1 1 Res, 5.1K Ω 1% (grn, brn, brn, brn, brn) E500109
R2 1 Res, 10 Ω 5% (brn, blk, blk, gold) E500054
C1,C2 2 Cap, 0.1 uF, 50V 20% mono E530020
J1 1 2.1mm power connector E620026
J2 1 BNC Jack right angle E620020
U1 1 LM78L05 5 volt regulator E600029
U2 1 49.380 TCXO ±5 ppm E660033
PCB 1 XG50 Printed Circuit Board E100451
1 Power Cable E980171
Assembly

Orient the printed circuit board with the silk-screened side up and the title “XG50” at the top.

Install R1 and R2 at the indicated positions.

Install C1 and C2 at the indicated positions.

Install U1 at the indicated position, being careful to orient the flat on the device so it matches the silk
screen outline.

Install U2 at the indicated position. The black dot on the device denotes pin 1. When correctly inserted
into the board, this dot will be oriented closest to the square PIN 1 hole.

Install J2, the BNC connector at the position indicated on the PC board silkscreen

Install J1, the power connector at the indicated position on the PC board silkscreen.
†
After initial 8 hour aging period.