User's Guide

Enhanced AM/FM Synthesizer Instruction Manual OS(R/T)-3(A/H) 29 - 470 MHz 7-1
6. REVISION HISTORY
ISSUE DATE REVISION
1 May 97 • Issue 1
2 Mar 98 • Changes to the AM Analog board (OST-3A128) to improve performance
ECO #547.
C37 was XXX nF is now XXX nF and C40 was XXX pF is now not installed
C45 was XXX nF is now XXX nF and C49 was XXX nF is now XXX nF
R32 was XXX kΩ is now XXX kΩand R36 was XXX Ω is now XXX Ω
3 Mar 00 • Changes to the AM Analog board to improve performance at -40˚C.
ECO #565.
L4 was XXX µH is now XXX µH
• Changes to the FM Analog boards to improve manufacturing. ECO #572
C32 & C33 were XXX µF through hole tantalums are now XXX µF surface mount
tantalums
• Changes to the OS-3A/H Digital board for compatibility with the new AM
wideband Synthesizers. ECO #579.
Added C15 (XXX µF) and R41 (XXX kΩ).
JU1 was added and is installed for AM modules only.
PCB, DIGITAL, OS-3H/P SYNTH was version 2 now version 3.
• Added the new component layouts, schematic diagram and parts lists for the new
AM wideband synthesizer. Wideband referring to only having to be tune
once and working over the whol e AM band (118-138 MHz).
4 May 00 • Changes to the OS-3H 128-174 MHz Analog board. ECO #603.
R29 was XXX is now XXX, U10 was XXXXX is now XXXXX.
• Changes to the OSR-3H 128-174 MHz Analog board. ECO #609.
R22 was XXX R is now XXX R.
• Changes to the OS-3A 118-159.4 Analog board. ECO #601.
R42 & R53 were XXX kΩ are now XXX kΩ.
Jul 00 • Corrected the SELECT table on the OS(R/T)-3H 128-174 MHz Schematic
diagram (section 4.3.3).