Xiegu X5105 QRP Transceiver
11
[ ] VFO Operation:
There are two ways to tune the X5105 VFO:
1. Use the
VFO Knob
and
Step Keys
: The current tuning step is highlighted on the frequency display,
and the
Step Keys (< >)
shifts the highlight left or right. Tuning steps are:
1 Hz
>
10 Hz
>
100 Hz
>
1 kHz
>
10 kHz
>
100 kHz
>
1 MHz
>
10 MHz.
Use larger steps for out-of-band general coverage
tuning or to change band segments. Use smaller steps to tune in discrete signals. The
VFO
knob’s
encoder changes frequency by 12 increments with each revolution.
2. You may also use the up (
^
) or down (
v
) keypad buttons on the microphone to shift the VFO by one
increment per click. These buttons are located immediately above the Rx/Tx LED.
[ ] ATU (Automatic Antenna Tuner):
Press the
ATU
button once to engage the internal tuner -- the
TUNE
icon will appear at the top of the screen. Then,
press and hold
the
ATU
button while watching the S-meter
display. When the bar-graph returns to 0 or stops moving, the tuning cycle is complete and the radio
automatically switches back to receive mode. To disengage the tuner, press
ATU
once and the
TUNE
icon
will disappear.
IMPORTANT WARNING:
Always connect a load to the Antenna connector when testing the ATU or when
transmitting.
[ ] RIT (Receiver Incremental Tuning):
This function changes the receiver frequency without changing the
transmit frequency. To enter the function, press
RIT
.
The
RIT
icon will appear on the right side of the screen,
and the RIT offset in ± kHz will appear directly below it. Rotate the
VFO
knob to program set the desired
amount of offset. After 5 seconds, normal VFO operation is restored.
[ ] PRE/ATT (Preamp/Attenuator):
Press to step through three choices:
ATT
(attenuator)
>
OFF
(bypass)
>
PRE
(preamplifier). Note that the preamp is unnecessary on the lower HF-bands and may even cause
front-end overload when many strong signals are present.
[ ] Nose Blanker (NB):
Press
NB
to toggle the noise banker on and off.
NB
is highly effective for
suppressing impulse noise generated by ignition systems, electric fences, etc. When on, the
NB
logo
appears next to the
FIL
(IF bandwidth) indicator. Turn this function off when not needed -- impulse blanker
may make strong adjacent-channel signals appear to splatter or distort. Note that DNR (digital noise
reduction) is more effective for reducing generalized atmospheric static and random electrical noise.
[ ] Data MODEM:
The X5105 has a built-in receive modem for copying PSK31 (see
Function Menu
section).
[ ] VFO-A/B:
The X5105 features two independent VFOs. These may be set up for two in-band frequencies,
for frequencies on two different bands, and even for split operation using two different modes. Press the
A/B
button (above tuning knob) to toggle between
VFO-A
and
VFO-B
. The VFO in use will be displayed at the
top-left of the screen as
VFO-A
or
VFO-B
.
To operate “split” in DX pileups, set
receive frequency
with
VFO-A
and
transmit frequency
with
VFO-B
. Then,
turn on the
SPL
(split) function on menu page-1 (
M1 -> SPL
). The radio will now switch automatically from
VFO-A
to
VFO-B
when you transmit. Whenever split is on, the
SPLT
icon will appear on the screen next to
the AGC icon.
[ ] LOCK Button:
The lock feature freezes all controls, protecting them from accidental change. Press
LOCK
(small red button to the right of the display) to engage the function. A small
Padlock
icon will appear
to the left of the button on the display. Press
LOCK
again to disengage the lock.