- Transmit: 160,80,60,40,30,20,17,15,12 and 10-meter amateur bands.
- Receive: 3.5-30 MHz nominal including general coverage, 0.8-32 MHz at reduced specifications.
Note: The ability of the Si570 to tune the radio below 2.5 MHz is not guaranteed in its specifications, but
most units have enough range to tune just below 1.8 Mhz. Maybe there are some small gaps where LO
does not work - if it works, it works fine.
Indicator is the color of the frequency digits:
- White: fully working
- Yellow: mostly working, maybe there are some small gaps
- Red: not working
Spectral Display Modes:
- Spectrum Scope: This is a spectrum analyzer with the vertical divisions representing user definable
amplitude variations of 5,7.5,10,15, 20,1 S-Unit (6dB),2 S-Units (12dB) or 3 S-Units). The baseline
("reference level") of the analyzer is automatically adjusted so that the signals within the displayed
passband best-fit the dynamic range selected by the user selected dB/division. A graticule along the
bottom of the display indicates the approximate frequency of the signal being displayed over a width of
+/- 24 kHz. (48 kHz total.)
- Waterfall Display: As with the spectrum scope, the frequency is displayed along the "x" axis but the
signal strength is implied by the displayed color. The newest signals are displayed along the bottom of
the screen, but as new readings arrive, the representations of the older signals are shifted upwards
giving an ephemeral time record of recent activity on nearby frequencies. There are several options for
color "palettes" that range from simple grayscale to "cold-hot" to "rainbow" to represent weak to strong
signals.
- There is also a "Magnify" mode for both the Spectrum Scope and Waterfall Display mode that provides
2x magnification, reducing the visible spectral width to just +/-12 kHz (24 kHz total). Both the Spectrum
Scope and Waterfall Display are very highly configurable. It is possible to disable one or both spectral
display modes if desired.
- Large-
signal handling capability: Continuous "Clip Warning “occurs above approximately
-28 dBm and
actual A/D clipping and distortion occurs at and above approximately -18 dBm for s/- the local
oscillator frequency and higher for signals outside this range.
Transmitter power output: <=10 Watts, typical, linear. Modifications may be made to increase this:
Follow the discussions in the Yahoo group.
