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RS-918 SSB QRP HF SDR

Specific:

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

-DC IN: 9-13V Max: 3A

-Output POWER: <= 10W

-Transmission: 160,80,60,40,30,20,17,15,12 and 10 meter amateur bands.

- Reception: 3.5-30 MHz nominal including general coverage, 0.8-32 MHz reduced specifications.

-MODES: CW, LSB, USB, AM, FM (N, W), SAM, freeDV

- Bandwidth: 300Hz-10Khz Adj

-SWR: Display 1-5

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

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

- Fence design: Removable

-Stm32f407VGT6 1M of memory

Technical specifications:

Because this is a software defined radio and due to ongoing changes / improvements to the software and hardware, the specs keep improving.

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

- Translation enabled frequency:

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

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

Translation Disabled Frequency:

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

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

The above specifications are for a receiver where the published sensitivity changes are performed.

Frequency coverage:

-Transmission: 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 reduced specifications.

Note: The Si570's ability to tune the radio below 2.5MHz is not guaranteed in its specifications, but most units have enough range to tune to just below 1.8Mhz. Maybe there are some small spaces where LO doesn't work - if it works, it works fine. Indicator is the color of

The frequency digits:

-White: fully functional

-Yellow: mostly working, maybe there are some small spaces

-Red: does not work

Spectral Display Modes:

- Spectrum Application: This is a spectrum analyzer with vertical divisions representing userdefinable amplitude variations of 5,7.5,10, 15,20,1 S-Unit (6dB), 2S-Unit (12dB) or 3S -Unit). The baseline ("reference level") of the analyzer is automatically adjusted so that signals within the displayed passband best fit the dynamic range selected by the userselected dB / division. A grating along the bottom of the display indicates the frequency of the signal being displayed over an approximate width of +/- 24 kHz. ((48 kHz total)

- Cascade Display: As with the scope spectrum, the frequency is displayed along the "x" axis, but the signal strength is implied by the displayed color. The newer signals are displayed along the bottom of the screen, but as new readings arrive, the representations of the old signals are shifted upwards giving an ephemeral record of recent activity on nearby frequencies. There are several color options for "color ranges" ranging from simple grayscale to "Cool-warm" to "rainbow" to represent weak to strong signals.

There is also a "Magnification" mode for both Spectrum Scope and Cascade Display mode which provides 2x magnification, reducing the visible spectral width to only +/- 12kHz (24kHz total.) Both Spectrum Scope and Cascade Display are very highly configurable. You can disable one or both of the spectral display modes if you wish.

Large-capacity signal handling: Continuous "Clip Warning" occurs above about -28 dBm and real A / D clipping and distortion occurs A and above about -18 dBm for signals +/- the frequency of the 'local oscillator and a larger one for signals outside this range.

Output transmitter power: <= 10 watts, typical, linear. Modification can be done to increase this: Follow the discussions in the Yahoo group.

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

Available TX / RX mode:

- CW, USB, LSB, AM (Full-carrier, dual sideband), SAM (dual sideband receiving) and FM.AM transmit and FM transmit / receive capabilities are ONLY available if the "translate frequency" is active ( highly recommended!)

- FM options: Carrier (ultrasonic) squelch, subaudible tone encoding and decoding, tone burst ("whistle up") generation, "narrow" (+/- 2.5 kHz) and "wide" (+/- 5 kHz) deviation and the selection of 7.2,10,12 or 15kHz pre-detection receive bandwidths.

FM sensitivity for 12 dB SINAD, CCITT filtering:

7.2kHz BW filter: -103.7dBm (1.46uV) with 1kHz tone at +/- 1.5kHz

10 kHz BW filter: -102.1 dBm (1.75uV) with 1 kHz tone at +/- 1.5 kHz

10 kHz BW filter: -104.0 dBm (1.41uV) with 1 kHz tone at +/- 3kHz

12 kHz BW filter: -102.7 dBm (1.63uV) with 1 kHz tone at +/- 3kHz

15kHz BW filter: -99dBm dBm (2.50uV) with 1kHz tone at +/- 3kHz

CW mode receive / transmit and frequency display details: Nine modes of CW display / shift are available to emulate various brands of radios and suit the user's taste, ranging from no shift, display-only shift, display and LO shifting and manual or automatic LSB / USB shifting.

In CW mode "CW-L" or "CW-U", It is displayed depending on whether LSB or USB is used for reception.

CW Speed ​​range: 5-48 WPM.

Available audio filter bandwidths in this firmware version: 300Hz, 500Hz, 1.8kHz, 2.3kHz, 3.6kHz, with a "wide" filter of 5,6,7.5 or 10kHz being selectable in all modes except FM, where filtering is done prior to demodulation as indicated above. All filters are softwaredefined and additional bandwidths could be made available. Filters can be used as BPF or as selectable LPF in the main menu./li>

DSP Filtering Capability: Noise Reduction and Automatic Notch Filter with adjustable parameters. Notch filtering is disabled in CW mode for (obvious reasons) OR when using a "wide" receive bandwidth. (Devel-branch: Because NR leads to instability when activating mcHF is disabled by default. If you want to use (and the risk of instability in various scenarios) You can activate NR in the "last item" setup menu. Setting the NOT TO BE STORED and must be activated after each power up. When NR problems are fixed and NR will be improved this function will be obsolete. )/li>

Calibration S-Meter: "Industry Standard" (IARU Region 1, Technical Recommendation R.1) calibration smeter where S-9 = -73dBm (50.2uV @ 50 ohm) with each "S" unit representing 6 dB. Units above S-9 are in dB units, as indicated./li>

External audio input / output connections:

- "Line In" and "Line Out" audio ports, and a "PTT" (Push-to-Talk) are provided with 3.5mm connectors to allow connection to an external device. With these connectors it is possible to interface with an external device (a computer or tablet / smart phone) and to use "Sound Card" mode with the mcHF such as SSTV, PSK31, WSPR and other analog / digital modes.

- (Devel-branch only): There is CAT function and audio-in and out also as IQ in and out via USB available. Input setting is in main menu # 60 or via long press of M3.

- Line out signal levels: Nominal 1 volt peak-to-peak, maximum when AGC is running.

- Line in signal levels: Nominal of 0.1-1.0 volts peak-to-peak, adjustable with the "Line Input Gain" settings.

- ALC transmission type: Look-ahead gain compressor with both pre-set and available "bespoke" settings.

Operating voltage range:

-16.0 volts maximum (when capacitors C27 and parallel tantalum for C106 both rf board are 25V)

- At 11.0 volts minimum for full transmit power

-A 9.5 volts for reduced transmission power

- As low as 6.5 volts, receive-only: only very low transmit power may be possible - peak audio distortion (SSB, AM) may occur.

Power Consumption:

1.Receive:

-Unmodified, approx. 410mA on 40 meters and below at 13.0 volts, approx. 440 mA on 10 meters, minimum volume, maximum display brightness.

-The selection of minimum display brightness can reduce this from 40-60mA.

2.Transmit (A 13.0 volt power supply): at full power around 3A; At 10W around 2.5A

Packing List:

1 × RS-918 HF SDR Transceiver

1 × PL-918 DC Power Cable

1 × HM-918 Hand Microphone

1 × key

1 × BNC TO SO239 Converter

1 × User Manual

1X 110-240v to 12V power supply (Without power plug)

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