MODE SELECTION
Each mode is described briefly below. Later sections cover each mode in detail. Tap
D
one or more times to select USB (LSB), CW (CWR), DIG, AM or FM mode. Long push
selects alternate modes, such as CW reverse (CWR). Also, long push returns normal mode.
•
SSB modes:
Mode is a narrow-banded voice mode that conserves space in crowded
band segments. It’s the most popular mode overall. LSB (lower sideband) is usually used
on 160, 80, and 40 meters, while other bands use USB (upper sideband).
•
CW mode
requires very little bandwidth, providing a high signal-to-noise ratio that’s ideal
for low-power use. It’s also a popular mode for DXing and contests.
•
CWR mode
reversing the received sideband in CW mode. This may reduce the level
of interference (QRM).
•
AM mode
is characterized by its good fidelity. It is much less power-efficient than SSB.
•
AM amateur
operation is often found on 160, 80, 40, and 10 meters.
•
FM mode
is most often used for local communications, and can be found on 10m and up.
•
DIG mode
typically use a computer connected to the transceiver to send/receive text.
Although SSB modes can also be used for this purpose, the TX-500’s audio-based data
modes (
E
) optimize settings for data rather than voice.
VFOs A and B
The TX-500 provides two VFOs. Use of VFO B is optional. Each VFO has independent
frequency, mode, and filter settings:
•
VFO A
normally controls both the receive and transmit frequency. Most contacts occur
between stations tuned to about the same frequency.
•
VFO B
can serve as a holding register for a second frequency of interest, then swapped
with VFO A as needed (see A<>B).
•
+ - Tuning rates:
Tapping
K
or
L
selects VFO tuning rate LSB, USB, DIG (10Hz, 100Hz,
1kHz, 2.5kHz, 5kHz), CW, CWR (1Hz, 10Hz, 100Hz, 1kHz, 2.5kHz), AM, FM (100Hz, 500Hz,
1kHz, 2.5kHz, 5kHz). SSB stations often align on 0.5 or 1.0kHz boundaries.
•
A->B
To copy VFO A’s frequency to VFO B: Tap
N>
A->B
. Tapping also copies VFO
A’s mode and filter settings to VFO B as well.
•
B->A
To copy VFO B’s frequency to VFO A: Tap
N>
B->A
. Tapping also copies VFO
B’s mode and filter settings to VFO A as well.
•
A<>B
VFO A and B swap: Tap
N>
A<>B
to exchange VFO frequencies, modes, and
all other settings.
RIT
Incremental Tuning, or receive incremental tuning, provides a means of adjusting the
receive frequency without affecting your transmit frequency. This control is sometimes
called a clarifier since it can be used to tune in SSB voice signals. But RIT can also be used
in all modes, in the event that a station calls you slightly off-frequency. RIT and XIT use the
tuning rate (1/10/100/200/300 Hz), taping
K
or
L
.
Adjust the level using the
F>
16 > CMR Level
or long push
N>
CMR
. High CMR
settings may result in distortion. Start with 1 to 30.
• ECH Echo:
The radio also has a built in reverberator that enables enhancing the transmitted
audio slightly. A very small amount of reverberation can enhance the signal but too much
makes it difficult to copy. Default is “DISABLE”.
Press
F>
17 ECH > Delay (times)
to toggle to delay times , depth, and level.
Before using this feature on the air, you should experiment with the adjustments while
transmitting into a dummy load and having a friend listen to your signal on a nearby
receiver.
• POWER
Set the power level (10-100%): tap
POWER
in the top line and rotate the knob
M
TUNE/MULTI
.
Do not use MIC gain to set power level.
Set mic gain to a fixed level as
described above.
• VOX
Selects push-to-talk (PTT) or voice-operated (VOX) transmit (
G
icon on). VOX
hold time is set with
F>
14 VOX > MIC
(time, ms).
F>
13 VOX L
(VOX level)
should be set to trigger at normal speech level, but not in response to incidental noise.
Start with low settings (10-20).
• VOX
Transmitter keying method: The VOX switch selects either VOX or PTT keying for
CW mode. Most operators use VOX, allowing the transmitter to be keyed immediately
whenever a hand key or keyer paddle is used. Tap
N>
VOX_D
in top line and rotate
TUNE/MULTI
or tap
F>
14 > VOX > CW
(time ms).
• METR
You can switch the transmit bar graph from MIC, ALC, PWR, SWR, PWR Num,
SWR Num, by tapping
N>
METR
in the top line. Rotate
M
TUNE/MULTI
knob.
• CW modes (CW,CWR)
To swith modes tap
D
to select
C
(CW normal). In some
cases an interfering received signal can be eliminated by switching to
D
(CW reverse)
using long push
D
.
• CWPITH
Set sidetone pitch using
CWPITCH
. The ideal pitch for most operators falls in
the range of 400-600 Hz. The receiver’s passband will be centered at the pitch you select.
Tap
N>
CWPITCH
and rotate
TUNE/MULTI
or
F>
02 > CW Pitc
h (Hz). Set sidetone
volume using
AF GAIN
in TX mode,
F
ON.
RECEIVE SETTINGS
• RF gain
is normally left at SSB, AM, FM, DIG(-0) and CW(+3). Reducing RF gain may be
useful in some strong-signal conditions.
• SQL
Squelch is used to mute the receiver until a signal appears. The control adjusts the
signal threshold required for squelch to “open,” unmuting the receiver.
• IF DSP
Virtual Intermediate Frequency: Specifies the Mode of the Receiver.
ENABLE:
This is the operating mode, utilizing all DSP features of the radio. This mode
uses a virtual Intermediate Frequency, which is offset from the operating frequency by a
few kHz. This is similar to ‘homodyne’ technology.
DISABLE:
When IF is disabled, the radio operates in simple Direct Digital Conversion
mode, and has soft reduced performances.
• FILTER
DSP filter tuning functions (LF/HF) The (LF/HF) control is used to shape the
Basic Operations
13
XIT
XIT or transmit incremental tuning, adjusts the transmit frequency without affecting the receive
frequency. RIT and XIT use the tuning rate (1/10/100/200/300 Hz), taping
K
or
L
.
•
To use RIT or XIT:
First, tap
G
RIT (RX mode) or tap
G
XIT (TX mode).
This turns on the "+0" on the display. Then adjust the offset using
RIT/XIT
knob.
•
To zero the RIT/XIT offset
tap
H
.
J
VFO lock/unlock
When the mode is activated, the inscription appears in the upper line of the display "LOCK",
frequency tuning is not possible. To deactivate the mode, press the button
J
again.
TRANSMIT SETTINGS
•
Voice Modes (SSB, AM, FM)
Choose a mode: Tap
D
to select
A
/
B
,
F
or
G
mode.
•
MON, Monitor
Push
N>
MON
in the bottom line for MON on. Hold PTT to set the voice
monitor level, rotate
M
AF GAIN
knob. High MON settings may result in audio clipping or
distortion. Start with 3 to 5.
Do not use the hand speaker-mic at the same time as monitor
F
function
in voice modes:
A
B
F
G
•
Adjust mic gain level
Push
METR
and select MIC, rotating
M
TUNE/MULTI.
While speaking into the mic, adjust
F>
09 > Gain > MIC
(mic gain).
While speaking, adjust mic gain for maximum 10 bars on a scale. Mic gain for the
TX-500 mic is typically 10-20.
•
CMR
Speech compression: To use speech compression, tap
N>
CMR
in the top line.
TX-500’s receive filter passband. In general, a narrow passband reduces interference
(QRM) and noise (QRN), while a wider passband improves fidelity. In voice modes, CW
and DIG modes long push
E
selects low-cut (LF) and high-cut (HF) frequency.
Pushing
E
select number of filter (1-4)RX, (1-2)TX. These functions remove low- or
high-pitched interfering signals. Reducing the width or shifting the passband may attenuate
an interfering signal above or below the desired one.
• PRE/ATT
Preamp
L
and Attenuator
D
turns on the RF preamp. It should be used
only when signals are very weak. Preamp gain can be set on a per-band basis.
D
turns
on the 20-dB RF attenuator, which can protect the receiver from strong interfering signals.
• NR
Noise reduction removes random background noise (hiss or static). It has a
characteristic “hollow” sound. Higher settings may attenuate weak signals. Tap
N>
NR
turns on noise reduction, holding
N>
NR
and displays its setting, which can be adjusted
using the knob
M
TUNE/MULTI
. Tap return to exit the setting display. Tap
N>
NR
again
to turn noise reduction off.
• NB
Noise blanking
C
can eliminate repetitive noise such as that from power lines,
appliances, and vehicle ignitions systems. The NB setting is adjusted in the same way as
NR (see above).
• NF
in SSB and AM modes,
B
turns on auto-notch, which locates and suppresses one
or more carriers automatically, Push
N>
NF
to enable or disable the Notch Filter.
• TONE
(Transmission tone). The transceiver will transmit a single tone. Pressing “Tone”
N>
TONE
again puts the transceiver in RX mode. A long press of
TONE
displays the
selection mode
NORMAL
(1000 Hz) or
DUAL
(two tones of 1000 Hz and 2000 Hz).
The transmission power is approximately 50%.