Yaesu FT-847 Operating Manual page 105

H -S
IGH PEED
S C
ETTING THE ONTROLS AND
S HSCW
WITCHES FOR
Set the front panel controls and switches as follows. It
is assumed, in this example, that you are injecting a
2000 Hz AFSK keying tone for transmission, and that
the "standard" for defining a frequency is the zero beat
frequency of your transmitter.
MODE: USB
CLAR (Switch): Off
PROC/KEYER: Off
AGC:
Fast
NB: Off
NR:
Off
DIG. FIL:
On
DSP:
Controls fully open at maximum
bandwidth
D. NOTCH:
Off
SHIFT: 12 O'clock
SQL:
Fully Counter-clockwise
SPLIT:
On
Set the Main and Sub VFOs to the same frequency, which
should be 2000 Hz (2.00 kHz) lower than the "sched-
ule" or "operating" frequency. This will make the zero
beat frequency of your 2000 Hz transmitted CW corre-
spond to the "schedule" frequency. If you are sending a
1500 Hz tone, instead, set the VFOs to a frequency 1500
Hz below the "schedule" frequency, etc.
During your first transmission, adjust the MIC (G
control to the position just before the point where the
power output no longer increases. Then adjust the RF
PWR control for about 25 Watts output on 144 or 432
MHz (50 Watts on 50 MHz). The duty cycle during
HSCW is much higher than with slower-speed CW or
SSB, and reducing the power output from the FT-847
to about 50% of its rated maximum is therefore rec-
ommended.
You may wish to experiment with the use of the DSP
bandpass filter to optimize the signal-to-noise ratio.
Most improvement will be realized by rotating the
LOW CUT control clockwise to some degree, as
counter-clockwise rotation of the HIGH CUT control
will attenuate the incoming audio tones. The use of
the DSP NR feature and the IF Noise Blanker gener-
ally is not recommended, because at high sending
speeds these circuits may interpret the (desired) CW
signal as being "noise," leading to the elimination of
the incoming signal from the receiver section! How-
ever, you may wish to experiment with the use of the
NB and NR features, as you may find them to be us-
able at your sending speed.
FT-847 O
PERATING
CW M S
ETEOR
)
AIN
M
ANUAL
( HSCW MS ) O
CATTER
O T
PERATING UTORIAL
Because operating practices for HSCW meteor scat-
ter are somewhat different throughout the world, only
general guidelines will be presented here. Consult with
your local VHF/UHF weak-signal society for specific
operating information; your Dealer may also have an
extensive selection of books on this subject, and a wide
variety of resources are available on the Internet.
Calling CQ
During non-meteor-shower conditions, you may wish
to call CQ on an established calling frequency such as
144.100 MHz (remember, if you use a 2000 Hz audio
tone, set your VFOs to 144.098.0 MHz). When listen-
ing for replies, use the SUB-TUNE knob, which tunes
your receive frequency.
If there is a lot of activity on the calling frequency,
you may wish to specify a listening frequency, and
operate in a truly "split" environment. The conven-
tion is to add a letter (A, B, C, . . .) following the "CQ"
call, indicating how many kHz up from the TX fre-
quency you are listening. According to this system,
"CQA" means you will listen "Up 1 kHz" while "CQB"
means "Up 2 kHz," "CQE" means "Up 5 kHz," and
"CQZ" means "Up 26 kHz." If you are calling "CQE"
and hear a response to your call 5 kHz up, you then
press the [AuB] key to QSY to the "E" frequency,
where the QSO is completed.
Completing a QSO
As with EME operation, there are commonly-accepted
standards for operating procedures.
Usually, one-minute sending and receiving sequences
are used. In North America, it is customary for the
westernmost station to transmit during the "even" min-
utes of the hour, (e.g. 1900~1901, 1902~1903, etc.),
while the easterly station transmits on the "odd" min-
utes (e.g. 1901~1902, 1903~1904, etc.). In Europe, the
opposite convention applies (the easternmost station
transmits on the "even" minutes). If both stations are
approximately at the same longitude, then the more
southerly station transmits on the "even" minutes, as
above. Be certain to clarify the sending sequencing
with the other station, so that you both are not trans-
mitting at the same time!
As with EME, when you have received both your call
and the other station's call, you send calls and a report
(see below). If you get both calls and a report, you
send a report and "R." If you get a report and "R," you
send "R" in reply, and if you get just an "R" you send
73" to signify completion of the contact.
Appendix
PERATION
103