Optional Filter Installation - Icom IC-775 Maintenance Manual

OPTIONAL FILTER INSTALLATION
After installing optional filters, the transceiver has 3*
kinds of selectivity for 2nd and 3rd IF filters to
provide better S/N (signal-to-noise ratio), or to reject
nearby interference.
* FM mode: 2 kinds of selectivity
Following optional filters are available.
passband |
width| Used. selectivity»
FL-101|250Hz/—-6dB|CWnar.
FL-102| 6.0 kHz/—6 dB| S~8 wide.
AM med., FM nar.
FL-223 | 1.9 kHz/—6 dB
FL-53A| 250 Hz/—6 dB
FL-222 | 1.9 kHz/—6 dB
When only 1 filter is installed for selectivity, such as a
FL-101 installed but no FL-53A installed, optimum
performance cannot be obtained for the selectivity
and the twin PBT function does not operate correctly.
Both filters, such as FL-101 and FL-53A, should be
installed.
4 FILTER SELECTION
After the filter(s) are installed, activate the op-
ional filter(s) in H-set mode. (p. 47) If this is not
correctly set, the installed filter(s) cannot be
selected.
QA A AG
@ Remove the top and bottom covers as described
on the first page.
@) Insert the filter(s) to the proper position. The
locations are shown in the figures below.
- The FL-53A and FL-222 must be installed in the
proper direction.
- The FL-101, FL-102 or FL-223 work regardless of
the direction they are installed in.
@) Replace the top and bottom covers.
FL-102 (or FL-101, FL-223) installation
Space for FL-101
—
—
Ky AE eh
Space for
FL-223
FL-222 (or FL-53A) installation
Space for
FL-53A
UT-66 VOICE SYNTHESIZER UNIT INSTALLATION
The UT-66 announces the operating frequency or
selected mode in a clear, electronically-generated
voice (in English or Japanese).
@) Remove the top cover as described on the first
page.
(2) Plug the UT-66 into J1 on the MAIN unit (back-
side of the S/RF meter) as shown in the figure at
right.
@) Replace the top cover.
@ Set the language and speech speed in H-set
mode. (p. 44)