Other Modes; Fm Operation; Digital Modes; Advanced Receiver Operation - Apache Labs ANDROMEDA ANAN-7000DLE MKII User Manual

6.3 Other modes
6.3.1 FM Operation
Frequency Modulation is available. When FM is selected as the operating mode, It is suggested that
the VFO tune step should be set to the FM channel spacing in use in your area. The Mode Settings
form from the TX Menu has several settings for FM operation including narrow/wide deviation,
repeater offset and CTCSS tones.
6.3.2 Digital Modes
Data modes can be used with ANDROMEDA. They will require an additional PC application, to act as
the user interface and modulator / demodulator for an audio stream. There are many well‐known
programs available: for example DM780 (for PSK31, for example) and WSJT‐X (for the JT65 like
modes).
With an analogue transceiver, data modes are easy to configure. Simply connect the radio's audio in
and out to a PC sound card via a transformer connection, connect the radio to the PC serial port, and
the digital program will be able to access the radio through a sound card and control TX/RX by CAT
commands.
With THETIS the process is similar. The key difference is: the audio is already "in" the PC. We need to
connect the two programs internally to the PC. The solution is simple – use Virtual cables. These are
software programs that run on the same PC as THETIS, and create a software interface for audio and
serial. Both programs "see" a sound card and serial port connection. The Thetis manual covers how
to configure the software and set up for data modes.
Remember that most data modes are high duty cycle. You will need to reduce the peak TX power to
avoid overheating your PA.
6.4 Advanced Receiver Operation
6.4.1 Dual RX Operation
The radio has two fully independent receivers. If RX2 is enabled you can listen on a different
frequency or different band from RX1 at the same time. RX2 is wired to a separate antenna input.
6.4.2 Attenuation
RF attenuators are available on the RX path before the A‐D converters. In the presence of
exceptionally strong signals, attenuation may be needed to prevent ADC overload. ADC overload will
be indicated clearly in the display if it happens.
The attenuators for each receiver can be set using the RX Menu.
6.4.3 Filter High/Low Cut
Each receiver has fully variable receiver filter bandwidths. Whenever the mode is changed, the
receiver filter bandwidth is set to that last used for the mode. A series of filter bandwidth are
available and can be stepped through using Filter+ and Filter‐ buttons.
The filter Low Cut and High Cut encoders provide a way to "dial" the filter settings quickly. If you are
listening to a weak station and begin to hear QRM, these controls can help you to remove the QRM.

If the QRM is at a low audio frequency: use the Low Cut knob to adjust the filter to reject it

If the QRM is at a high audio frequency: use the High Cut knob to adjust the filter to reject it
The filter bandwidth is shown on the panadapter display as a grey bar.
ANDROMEDA Manual Page 29 of 56