Specifications

PSK31
Can the CW filter be used in the PSK31 modes? If so, when should it be used?
YES. The CW filter can be used as an effective tool in mitigating undesired signals when
operating in the PSK31 modes. When you have NAR set ON, you will see the signals
displayed on the waterfall display be limited to about 500 Hz (filter bandwidth) and all
others signal are essentially eliminated. However, the spectral position of the CW filter
passband is determined initially by the CW setup in Menu. Consequently, you may have to
move the CW filter passband center frequency to the desired signal by using the IF shift
control. See manual for control operation.
17/02/01
QRM SUPPRESION ON CW
How can QRM be reduced when working CW?
Effective QRM suppression when working CW can be often achieved by using a
combination of the IF Shift, CW/CWR mode selection, NAR, AGC recovery time constant
selection, and the Clarifier. The CW/CWR mode selection switches between USB and LSB
carrier injection and is frequently an overlooked but powerful tool to move the QRM source
out of the passband.
18/04/01-R
RTTY
I have a TNC that I have used for RTTY with my other rig. Do I have to lug that
around to operate RTTY when portable?
NO. If you have a computer with a soundcard (see comments under PSK31), you can use
one of several software realizations of RTTY operation. For example, TrueTTY works well
and also includes a PSK31 mode (see www.dxsoft.com).
S-METER
My S-meter just quit working. What's wrong?
Most likely, you have turned your AGC to OFF. In this mode, the S-meter will not work
since it monitors the AGC voltage. You can reset it by pressing the Function Key and going
to Operating Function Row 8 and toggling key B to select auto, fast, or slow.
S-METER
Is the calibration of the S-meter accurate?
Based upon the evaluation of one unit, the S-meter appears to provide a reasonably good
representation of signal strength. Over all bands, it was within a S-unit except on 2 m. It
should be noted that the difference in S-units dramatically decreases for lower S-unit
values. The signal difference between S-2 and S-3 is less than 2 dB (1/3 of a S-unit).
Consequently, use care when interpreting low signal levels with the S-meter.
31/05/01
S-METER
What is a S-unit?
The S-unit is defined to be a 6-dB change in the signal strength. S-9 is typically defined to
be 50 microvolts at the antenna input.