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USB
AGC AUTO SPLIT
RIT
6 COMMUNICATING
TF-SET (TRANSMIT FREQUENCY SET)
[TF-SET] allows you to quickly check or adjust your
transmit frequency without changing your receive
frequency.
1 Press and hold [TF-SET].
•Without changing your receive frequency, you are
now receiving on your transmit frequency.
2 To select the transmit frequency that you want, turn
the Tuning control, the M.CH/VFO.CH control, or
press Mic [UP] or [DWN].
3 Release [TF-SET].
•You are now receiving again on your original
receive frequency.
Note:
Switching ON Menu No. 10 (
FREQ) allows you to see the
frequency difference between your transmit and receive frequencies
when
[TF-SET]
is pressed.
Successfully contacting a DX station in a pileup often
depends on making a well-timed call on a clear
frequency. The best way to know if your intended
transmit frequency is clear is to use [TF-SET]. Press
[TF-SET] and listen. Had you transmitted at that
moment, would you have transmitted simultaneously
with other stations or the station that you are calling?
After using [TF-SET] a couple of times in this manner,
you will learn the rhythm of the DX station and the
pileup. Use the information to select a relatively clear
transmit frequency and to transmit at the exact instant
when the DX station is listening but the majority of the
group aren’t transmitting. The more proficient you
become at using this function, the more DX you will
contact.
Note:
If you press
[F.LOCK]
before using
[TF-SET]
, you will eliminate
the risk of changing your receive frequency accidentally.
[TF-SET]
is disabled while transmitting.
If you recalled a memory channel (excluding CH 99) for the
transmit frequency, you must set Menu No. 49 (CH.SHIFT) to ON
to use
[TF-SET]
to change the frequency of the memory channel.
Furthermore, you can turn the
M.CH/VFO.CH
control, or press
Mic
[UP]
or
[DWN]
, to switch to a different memory channel.
An RIT frequency shift is not added; however, an XIT frequency
shift is added to the transmit frequency.
[TF-SET]
is also enabled while operating with the same TX/RX
frequency (non-split).
SATELLITE OPERATION
Though not as common as VHF/UHF satellite operation,
HF satellite operation is possible depending on which
satellites are currently in orbit around the Earth. When
HF propagation is poor, satellite operation can provide
an incentive to get back on the air. Since this
communications mode is so reliable, you may discover
you actually prefer satellite operation over the
hunt-and-miss method of communicating via the
ionosphere.
An example of a Mode K satellite that has uplink and
downlink frequencies that are both on HF is the Radio
Sputnik 12 (RS-12). Launched in the early 1990s, this
satellite is in a low Earth orbit and provides brief
windows of opportunity for use as it passes quickly over
your location. This satellite accepts SSB or CW signals
on the 15 meter band and outputs them on 10 meters.
Contacts are possible on bands that might otherwise be
vacant during low periods of the solar cycle. Your
TS-870S can also be used with Mode A satellites, those
that use a VHF uplink and an HF downlink, if you also
have an SSB/CW VHF transceiver.
If you’re interested in pursuing Mode K operation,
contact AMSAT (Radio Amateur Satellite Corporation).
This group of satellite operators, located all over the
world, support the construction and operation of
satellites. AMSAT can provide you with the latest
information regarding Mode K and Mode A satellites that
are currently in orbit.
49


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