GENERAL INFORMATION
1-7
Revised July 1999
Part No. 001-7500-002
REVISION SUMMARY
1.15 REVISION SUMMARY
1.15.1 GENERAL
This service manual covers revisions made to the
Falcon™ 751x/754x transceivers through July 1999.
The following information summarizes these
revisions.
1.15.2 SOFTWARE REVISIONS
New Operating Software
Beginning later in 1999, transceivers containing a
new release of operating software will begin shipping.
Transceivers with this new software can be identified
as follows:
•
The revision letter in the identification number is
“C” or later (see Section 1.4).
•
The operating software is Rev 3.1 or higher. This
number can be determined by selecting Program >
Information using the programming software as
described in Section 3.4.4.
New Programming Software
New programming software is required to
program transceivers with the new operating soft-
ware. This new release is Rev 3.1 or later, and the revi-
sion number is indicated in the upper left part of the
programming screens. Refer to Section 3.1.4 for more
information.
This new software is backward compatible which
means it can also be used to program earlier “A” and
“B” model transceivers.
New Features
•
Additional banks can now be programmed. In addi-
tion to 2 banks x 16 channels, 4 banks x 8 channels
or 2 banks of 20 ch 12 channels can be
programmed.
•
The operation of several features has been changed
to improve performance.
•
Support has been added for an optional scrambler
and output port. However, those particular options
are not available, so references to them in the
programming software can be ignored. If scram-
bling is desired, use the Transcrypt® scrambler
listed in Table 1-1 instead.
1.15.3
VHF (7510)
HARDWARE REVISIONS
C44 (on input of Q32) - With high band (146-174
MHz) models only, changed to 0.0033 µF.
C284 (near output of IC3D) - With high band (146-
174 MHz) models only, changed to 0.001 µF.
R248 (near output of IC3D) - Changed to R119, a
300k-ohm potentiometer. This control is factory preset
and should not require readjustment in the field. Devi-
ation continues to be set electronically as described in
Section 5.4.3
R225 (on output of Q38) - Changed to C292,
0.1 µF.
R258 (100 ohm) - Added in series with pin 22
(AFOUT) of 30-pin output port.
1.15.4
UHF (7540)
HARDWARE REVISIONS
R225 (on output of Q38) - Changed to C500, 0.22 µF.
R471 (100 ohm) - Added in series with pin 22
(AFOUT) of 30-pin output port.