Installation Of Optional Accessories; Optional Filters (Yf-112S-02/Yf-115C) - Yaesu FT-847 Operating Manual

Installation of Optional Accessories

I
NSTALLATION OF
•
Remove the carrying handle and bottom case of
the transceiver (see Figure 1). Be sure to remove
the screw affixed to the rear panel.
‚
Refer to Figure 2, and locate the mounting posi-
tions for the CW (YF-115C) and/or SSB (YF-
112S-02) filters on the M
ƒ
Push the optional filter board(s) onto the pins cor-
responding to the assigned mounting location on
the radio. Gently press the board(s) down until the
pins are firmly seated in the connectors.
Figure 1
Because the FT-847is required to transmit and receive simultaneously during Satellite operation, two op-
tional filter slots are provided for the installation of optional Collins® Mechanical Filters for SSB.
Whether or not you are operating in the Satellite (full duplex) mode, the "RX" filter is always used on
Receive, and the "TX" filter is always used on Transmit. As shipped from the factory, compact Ceramic
filters are installed in both SSB filter locations.
The information below will describe the benefits gained by optional filter installation in each location:
Installation in "TX"Location
Utilization of a Collins® Mechanical Filter on the Transmit side provides a very flat, natural-sounding
frequency response which has negligible ripple. The Collins® Filter will yield very faithful reproduction of
your voice's tonal response. For sending of PSK and other data, the low group delay characteristics provide
very high through-put.
Installation in "RX" Location
Compared to the stock Ceramic Filter, the Collins® Mechanical Filter provides deeper suppression of an-
noying interference to the side of your current frequency, although the bandwidths of the two filters (at -6
dB) are approximately the same.
FT-847 O
PERATING
O F
PTIONAL
Unit.
AIN
Notes Regarding SSB Filters
M
ANUAL
YF-112S-02/YF-115C
ILTERS
„
Replace the bottom case of the transceiver.
...
Turn the transceiver on, and enter the Menu mode.
Per the details on page 88, change the setting of
Menu #33 to "ON" if installing the YF-115C CW
filter.
Figure 2
95