fdm-s1 sampler or receiver?sdr.eladit.com/fdm-s1 sampler/presentazione_fdm_s1_011_en...fdm-s1 •...
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![Page 1: FDM-S1 Sampler or Receiver?sdr.eladit.com/FDM-S1 Sampler/presentazione_fdm_s1_011_en...FDM-S1 • Direct sampling SDR Receiver - 200 MHz font end Bandwidth • Small size and weight](https://reader030.vdocuments.site/reader030/viewer/2022041119/5f302f548580721d2f7e9e2f/html5/thumbnails/1.jpg)
FDM-S1
Sampler or Receiver?
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FDM-S1
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FDM-S1
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FDM-S1
• Direct sampling SDR Receiver - 200 MHz font end Bandwidth
• Small size and weight - 108 x 27 x 88 mm
- 180 g
• Powered by USB connection - Low power consumption < 2.2 W
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FDM-S1
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FDM-S1
L’FDM-S1 is provided with proprietary software ELAD FDM-SW1
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FDM-S1
•Tunable frequencies:
Receiver Mode: 0 ÷ 30 MHz (Direct Sampling) Sampler Mode: 30 ÷ 200 MHz (Undersampling)
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FDM-S1
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Sampling, Aliasing and Undersampling
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The sampling theorem states that if a signal s(t) contains no frequencies higher than B
fc ≥ 2B
Sampling theorem
then it can be reconstructed exactly when it is sampled at a rate that is at least twice the maximum frequency component B.
S(f)=0 per f>B
The frequency fN = fC/2 is called Nyquist frequency
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Sampling theorem
Example: FDM-S1
fc = 61.44 MHz fn = Bmax = fc/2 = 30.72 MHz
According to the sampling theorem, we are able to analyze signals that contain frequency components up to 30 MHz
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Sampling theorem
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What happens when we don’t comply with the sampling theorem?
ALIASING
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Aliasing
In the presence of Aliasing, given a sampled signal sc(nTc) (where Tc=1/fc corresponds to the sampling interval), we are not able to know univocally the original signal s(t)
Every frequency component of the original signal that has frequency greater than fN will be “confused” as a spectral component at frequency 0 ≤ f ≤ fN
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Aliasing
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Aliasing
Due to the aliasing, in the 0 ≤ f ≤ fN frequency range we will have the superposition of each frequency that falls within the bandwidth of the analog-to-digital converter
FDM-S1 front-end exhibits 200 MHz input bandwidth
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Aliasing
Aliasing
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Aliasing
Example: aliasing caused by FM broadcasting (89 MHz)
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Aliasing
Aliasing frequencies computation
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Aliasing
FDM-SW1 helps users highlighting frequencies that are multiples of the Nyquist frequency
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Be careful to correctly understand the signals that I obtain in the presence of aliasing
Aliasing
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How can we avoid aliasing errors?
Anti-Aliasing Filter
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Anti-Aliasing Filter
Filter which limits the bandwidth of the input signals cutting all the spectral components greater than the Nyquist frequency
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Anti-Aliasing Filter
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FDM-S1 has 30 MHz anti-aliasing filter
Anti-Aliasing Filter
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Is Aliasing always a bad issue?
NO!!! We can take
advantage of it
UNDERSAMPLING
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Undersampling
Undersampling technique uses the Aliasing phenomenon to realize a digital mixer Undersampling is commonly implemented in several types of digital receiver, e.g. mobile phones Using undersampling technique, we are able to convert within the analysis band (0 ≤ f ≤ fN) portions of the spectrum that are located at higher frequencies
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Undersampling
To avoid the superposition we must use preselection filters (band pass)
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Undersampling
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Undersampling with Preselector
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N.B.: preselection filter’s bandwidth must satisfy the following rule
Undersampling
N*fN ≤ B ≤ (N+1)*fN
otherwise we will obtain aliasing again
Example: filter for the FM 88 ÷ 108 MHz band
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Undersampling
No problem with the 144 ÷ 146 MHz band
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Undersampling
Elad will commercialize a partially mounted developing board (controlled by SW) to help users to develop custom preselection filters
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FDM-SW1 Features
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FDM-SW1 Features
• Innovative multi-level tuning bars - Fast tuning on the whole spectrum - Configurable span for “Middle” e “Band” bars - Patent Pending
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FDM-SW1 Features
• 20 dB attenuator • Anti-aliasing filter (30 MHz Low-Pass)
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FDM-SW1 Features
• Demodulation modes: - CW, CW SH+, CW SH-, USB, LSB, DSB - AM, SAM,FM, WB FM (Stereo + RDS) - DRM
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FDM-SW1 Features
• Two Notch filters at IF stage
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FDM-SW1 Features
• Adaptive De-Noiser (Audio) • Adaptive Auto-Notch (Audio) • Automatic Gain Control (Audio)
- Slow, Medium, Fast and Manual
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FDM-SW1 Features
• Advanced file recording/playback: - Fast file positioning using scrolling bar - Programmable recording - Settings memorization in the file’s header
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FDM-SW1 Features
• User station memory (file .xml) • EIBI database support • Memories visualization on the spectrum
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FDM-SW1 Features
• 3 types of memories visualization
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FDM-SW1 Features
•DX-Cluster connection and visualization of the connected users on the spectrum • 3 types of visualization (same ways as memories)
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FDM-SW1 Features
• Panadapter function - Configurable IF freq. and amplitude offset - Spectrum flip - CAT protocol (SW master or slave)
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FDM-SW1 Features • Possibility of using different USB sample rate (192, 384, 768, 1536 e 3072 kHz, canali I/Q, 32 bit/sample) •Possibility of using two soundcards • Configurable presets
- Frequency Step - Filter Bandwidth
• Possibility of using configurable default settings (mode, bandwidth, Att, LP30, etc) within user-defined frequency ranges • Tmate and Tmate2 interface
- Configurable function buttons
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FDM-SW1 Features •Apple virtual machine compatible (tested on VMware Fusion environment)
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FDM-S1 Alternative Software
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Alternative Software Thanks to a dll interface, FDM-S1 can be used with third party software
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FDM-S1 Homebrew Radio Support
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Homebrew Radio Support
Users could improve the performances of FDM-S1 realizing custom filters on a developing board controlled by software (FDM-SW1 or third party)
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Homebrew Radio Support • SFE 1.0 board
-DB9 interface between FDM-S1 and SFE board - 2 antenna input (SMA) - Possibility of switching 7 relays - 7 Led monitor for the 7 External I/O - 2 Led monitor for 5V from FDM-S1 and 12V Ext - Possibility of switching 1 bypass relay
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Homebrew Radio Support SFE 1.0 schematic
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Homebrew Radio Support SFE 1.0 setting using FDM-SW1
![Page 54: FDM-S1 Sampler or Receiver?sdr.eladit.com/FDM-S1 Sampler/presentazione_fdm_s1_011_en...FDM-S1 • Direct sampling SDR Receiver - 200 MHz font end Bandwidth • Small size and weight](https://reader030.vdocuments.site/reader030/viewer/2022041119/5f302f548580721d2f7e9e2f/html5/thumbnails/54.jpg)
Homebrew Radio Support SFE 1.0 setting using third party software
![Page 55: FDM-S1 Sampler or Receiver?sdr.eladit.com/FDM-S1 Sampler/presentazione_fdm_s1_011_en...FDM-S1 • Direct sampling SDR Receiver - 200 MHz font end Bandwidth • Small size and weight](https://reader030.vdocuments.site/reader030/viewer/2022041119/5f302f548580721d2f7e9e2f/html5/thumbnails/55.jpg)
ELAD Sales Network • Sales of FDM-S1 are assigned only to EQP (Elad Qualified Partner)
Woodbox Radio is EQP for Europe www.woodboxradio.com
• For professional uses and customizations, please contact directly ELAD company
www.eladit.com
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Thanks
Elad Team