Expert Electronics SunSDR2 DX

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SunSDR2 DX User Manual

ExpertSDR2 SOFTWARE DESCRIPTION

Deviation – FM deviation. The width of the FM signal on air will be twice the deviation width.

High - frequency of the high filter slope of the LF signal before FM demodulator. Set the

required LF signal width from zero up to high filter edge.

Voice Recorder - settings of the playback level.

Volume for TX – additional gain volume in TX for the voice record. Set this parameter so that

the signal on MIC-meter would reach -10...-5 dBW values.

Note:

If a recorded signal, which was received from the air, wasn't compressed by the transmitter, it

has low RMS power - lower, than compressed signal. Voice recorder has its own AGC, it

doesn't allow TX signal level to surpass the maximum threshold, to avoid clipping. This AGC

has maximum amplitude limit for audio signal output +3 dB, it allows an operator to hear slight

clipping with a high gain level of voice recorder signal and adjust correct Volume for TX

coefficient, keeping a good quality of TX signal. The Peak level set in ExpertSDR2 is 0 dB. The

RMS signal level is 3 times weaker by amplitude than peak level. TX signal, recorded by the

Voice Recorder, is transmitted on the air without processing e.g. TX processing module does

not influence signal transmitted via the Voice Recorder.

PA control - external PA control settings.

Enable PA in Tone mode - checkbox to enable the TX mode of the external PA in the Tone

mode (transmission of the carrier frequency). Set the Enable PA in Tone mode checkbox to

enable the TX mode for the external PA while transmitting the carrier frequency. This mode

might be useful to tune PA's tuner unit.

TX Filter Taps - transmit Filter Taps settings.

SSB - Filter Taps in SSB mode.

AM/NFM - Filter Taps in AM mode and narrowband FM.

DIGL/DIGU - Filter Taps in DIGL and DIGU modes.

PTT switching delay – set the delay time between switching the transceiver to RX/TX and the

first relay closure.

Rx to Tx – delay time to generate HF signal after turning from RX to TX.

Tx to Rx – when you stop transmitting, the transceiver waits for the certain “delay time” then

switches from TX to RX.

Warning!

Expert Electronics SunSDR2 DX - Page 60