R1.1
Copyright © 2016 SDRplay Limited
16
SDRuno User Manual
4.6 Temporary LO Lock
Changing the hardware LO has the effect of changing the tuning frequency of all the active VRX. This
happens when you change the tuning frequency of VRX #0 (the master RX). If you wish to change the
frequency of VRX #0 without changing the hardware LO you can use the LO LOCK button in the Main
window. But if you need only a temporary lock simply press the SHIFT key while tuning.
4.7 Quick recording
SDRuno includes a feature to put a SDRuno
instance in recording mode “on the fly”, without opening the
Recorder window. When you wish to start recording simply press ‘*’ on the keyboard (the relative SDRuno
instance must have the focus).
4.8 CW pitch (CW shift)
In CW receiving mode a VRX uses a frequency offset in order to obtain a CW note. This offset can be set
as follows:
-
Make sure you have the DSP engine running (so to have the spectrum windows updated).
-
Select CW receiving mode.
-
Place the cursor in the spectrum part of the Aux Spectrum window (SP2); a green vertical line will
be shown at cursor position.
-
Choose your new CW pitch moving the above line to the corresponding mark on the frequency
scale; a positive value will set a “lower than carrier” offset (USB-CW) while a negative value will
set a “higher than carrier” offset (LSB-CW).
-
Assign the new offset by Left-Click while pressing the CTRL key.
4.9 Quick notch frequency setting and the notch-lock function
Each VRX offers four notch filters to suppress unwanted signals, placed before the AGC. Each notch filter
can be enabled/disabled by the relative button in the RX Control window. The notch filters BW e
Frequency settings are available in the RX EX Control window. For notch filters 1 & 2 the frequenci es can
be quickly set “on the fly” as follows:
-
Place the cursor in the spectrum part of the Aux Spectrum window (SP2); press and hold the
SHIFT key: a yellow vertical line will be shown at cursor position.
-
Move the above line next to the signal you wish to suppress.
-
Assign that frequency to Notch 1 by Left-Click or Notch 2 by Right-Click.
-
Release the SHIFT key.
-
For each enabled notch the relative frequency is marked in the spectrum by a dotted vertical line,
light-blue for Notch 1 and light-pink for Notch 2.
The
NCHL
button in the RX Control window enable/disable the notch-lock feature. When notch-lock is
active, the notch filters frequencies are updated when the receiving frequency is changed.
Let’s see the purpose of the Notch Lock function in a typical usage scenario: you are following a SSB
QSO where some operators are each other slightly off frequency, requiring retuning for good audio. At the
same time you are using a notch filter to kill a heterodyne tone caused by a nearby emission. Without
notch-lock you should re-adjust the notch filter(s) frequency every time you retune; notch-lock does this for
you automatically.
