HF QRP Transceiver ,put battery 12v and ANT can qso.

DC IN:9-13V Max:3A

Output POWER:<=10W (44dbm)

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.

MODE:CW,LSB,USB,AM,FM(N,W),SAM,FreeDV

bandwidth:300Hz-10Khz Adj

SWR:Display 1-5

Better than -108 dBm (0.89uV) in a 2.3 kHz bandwidth

Better than -120 dBm (0.22uV) in a 300 Hz bandwidth

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Technical Specifications

Because this is a software-defined radio and due to ongoing modifications/improvements of the software and hardware, the specifications continue to improve!

Receiver sensitivity for 10dB S/N, CCITT filtering, taken at 28.3 MHz:

Frequency Translation enabled:

Better than -111 dBm (0.6uV) in a 2.3 kHz bandwidth

Better than -126 dBm (0.11uV) in a 300 Hz bandwidth

Frequency Translation Disabled:

Better than -108 dBm (0.89uV) in a 2.3 kHz bandwidth

Better than -120 dBm (0.22uV) in a 300 Hz bandwidth

The above specifications are for a receiver on which the published sensitivity modifications are performed.

Frequency coverage:

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 that 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 userdefinable 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 userselected 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 signals +/- 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.

Frequency stability: +/- 30 Hz at 14 MHz over the range of 10 to 35 C, ambient with the transceiver in the case or better with the TCXO active. (It can be much better than this.)

Available TX/RX modes:

CW, USB, LSB, AM (full-carrier, double-sideband),...

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