Instruction Manual

DE
DANIELS
ELECTRONICS
MT-3 AM Transmitter Main Board Instruction Manual 7-1
7 REVISION HISTORY
ISSUE DATE REVISION
1 May 97 • First Issue.
2 March 98 • To improve performance and efficiency of the Audio Processor Board.
ECO #541.
- C18 was 82pF is now 150pF
- R20 was 8k25 is now 3k01
- R21 was 1M0 is now not installed
- R26 was 470k is now 3M30
- Moved SM jumpers to the SM side of the PCB. Moved P1, P2 & P5
to the correct positions. Added land pattern to the PCB for R21.
3 June 98 • Corrected the part number for D1 and D2 on the MT-3 AM Audio
Processor Electrical Parts List.
December 98 • The Butterworth filter stages were changed to Bessel filters to improve
the differetnial group delay of the AM Transmitter. ECO #563.
- The AM Audio Processor PCB was 50049-02 is now 50049-04.
• Updated the DE logo and added the statutary notice to the title page.
Corrected the drawing numbers on the Transmitter layout and schematic
drawing.