the filters go to their highest Q (determined by factory-selected resistors), which yields the
100
bandwidth.
Bandwidths from 30
to 3
(BW7 =
These bandwidths are produced in the 21.4 MHz IF by five crystal filters (two in
and
three in
Their Q (which determines bandwidth) is controlled by PIN diodes, the same
as for the wider bandwidths. Refer to the preceding discussion of the wider bandwidths.
is the current sink for bandwidths from 30
to 3
The amount of current it sinks is
selected by U2 and adjusted by potentiometers R65 and R66 (10
and 3
depending
on which bandwidth is selected. If no current is sunk by
the filters go to their lowest Q
(determined by factory-selected resistors), which yields the 30
bandwidth. should be
off except for the 3 MHz to 100
bandwidths.
Bandwidths from 1
to 10 Hz (SWITCH =
These bandwidths are produced in the 3 MHz IF
by five crystal filters. The Q of
these filters is controlled by resistors which are switched in by diodes. These, in turn, are
controlled by Q25, Q26, Q28, and Q29. The transistors switch lines which are named after the
bandwidths they produce. Q27 is on (saturated) only for bandwidths 1
through 10 Hz.
Option 462 3
Содержание 85662A
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Страница 409: ...Table 4 Video Bandwidth Truth Table 6 A4A9 ...
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Страница 452: ...A4A6A2 Output Driver Component Locations 85662 60170 Option 067 Tab ...
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Страница 473: ...Table 4 Video Bandwidth Truth Table Option H96 3 ...
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Страница 504: ...Table 4 Video Bandwidth Truth Table 100 Hz H 30 Hz H H 10 Hz H 3 Hz H 1 Hz 6 Option 462 ...
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Страница 594: ...HEWLETT PACKARD HP Part No 85662 90085 Printed in USA ...