by Cliff Pulis, KE0CP SDR Presentation - Cliff Pulis, KE0CP 1
Basic Receiver Principles Mixing Frequencies Hetrodyn ing The IF Amplifier SDR Principles & Quadrature Phase (IQ) VHF / UHF DVB-T Dongle SDR Software The SDR Up-Converter Kit Does it Work? Cost SDR Presentation - Cliff Pulis, KE0CP 2
Antenna Ground system Tuner Detector (demodulator) Reproducer SDR Presentation - Cliff Pulis, KE0CP 3
Result is f 1 + f 2 and f 1 f 2 10,000 Hz and 9,000 Hz result in 19,000 Hz and 1,000 Hz SDR Presentation - Cliff Pulis, KE0CP 4
Hetrodyne mixing 2 frequencies Superhetrodyne mixing 2 signals when one is supersonic above our range of hearing A mixer or product detector mixes 2 frequencies SDR Presentation - Cliff Pulis, KE0CP 5
In a real radio need to amplify weak RF signal Amplifier needs good characteristics Wide bandwidth, low distortion, reject unwanted frequencies Mix RF and Local Oscillator (LO) so output is always centered on a fixed frequency Called: Intermediate Frequency (IF) Amplifier SDR Presentation - Cliff Pulis, KE0CP 6
This is a single-conversion superhetrodyne receiver. A dual-conversion would have 2 LO s & IF amplifiers. Many Ham receivers are triple-conversion superhets. SDR Presentation - Cliff Pulis, KE0CP 7
If LO frequency is near or at RF signal s frequency we can retrieve the modulation. We can demodulate the Audio signal with Analog to Digital (A/D) converter Digital Signal Processing (DSP) Need stable LO & computer for A/D & DSP SDR Presentation - Cliff Pulis, KE0CP 8
If 2 waveforms 90-degrees out-of-phase are amplitude modulated the result is called Quadrature Amplitude Modulation The In-phase component is I. The 90-degree shifted component is Q: thus I-Q. With DSP both the I and Q components can be extracted demodulated. SDR Presentation - Cliff Pulis, KE0CP 9
SOFTWARE: SDR# Zadig 7-Zip Antenna DVB-T Dongle Software PC (VHF/UHF Rcvr) SDR Presentation - Cliff Pulis, KE0CP 10
Antenna In Bandwidth: 64 MHz to 1,200 MHz USB Out to computer Also want HF: 0.5 to 30 MHz We still need demodulate the signal computer & DSP software SDR Presentation - Cliff Pulis, KE0CP 11
SDR# (SDR-sharp) software on PC (Free) Tuning Control Demodulation Digital to Analog conversion Amplification SDR Presentation - Cliff Pulis, KE0CP 12
SDR Presentation - Cliff Pulis, KE0CP 13
Need an Up-converter to: Shift incoming HF up 125 MHz 1.8 MHz 126.8 MHz (160 Meter Band low f) 29.7 MHz 154.7 MHz (10 Meter Band high f) Use Oscillator & Mixer IC s on a pc board This is the Kit you can build SDR Presentation - Cliff Pulis, KE0CP 14
DVB-T Dongle: $31.90 (includes shipping) Dongle price has dropped to about $10. SDR Up-converter kit: $36.90 (includes shipping) By Hayseed Hamfest Total without cabinet, etc. is under $50 SDR Presentation - Cliff Pulis, KE0CP 15
Newsky DVB-T Dongle -or equivalent- SDR Presentation - Cliff Pulis, KE0CP 16
Surface-mount 125 MHz Oscillator SDR Presentation - Cliff Pulis, KE0CP 17
Tin the 4 pads Solder in place SDR Presentation - Cliff Pulis, KE0CP 18
Voltage Regulator 125 MHz Oscillator Antenna Relay Mixer/LO SDR Presentation - Cliff Pulis, KE0CP 19
SDR Presentation - Cliff Pulis, KE0CP 20
SDR Presentation - Cliff Pulis, KE0CP 21
SDR Presentation - Cliff Pulis, KE0CP 22
SDR Presentation - Cliff Pulis, KE0CP 23
SDR Presentation - Cliff Pulis, KE0CP 24
SDR Presentation - Cliff Pulis, KE0CP 25
SDR Presentation - Cliff Pulis, KE0CP 26
SDR Presentation - Cliff Pulis, KE0CP 27
SDR Presentation - Cliff Pulis, KE0CP 28
Demodulator: RTL2832U Tuners: Elonics E4000 tuner (52 2,200 MHz with gap from 1,100 1,250 MHz) Raphael Micro R820T tuner (24 1,700 MHz with no gap) Dongle / Stick: RTL2832U / E4000 such as Realtec or Newsky, etc. RT-2832U / R820T Raphael Micro, DX, etc. Will need antenna adaptor TV PAL male etc. to type F female SDR Presentation - Cliff Pulis, KE0CP 29
You need 2 pieces of software both free Zagdig is a driver needed for each USB port you connect the radio to. SDR# is the UI software to run the radio Both programs are available at: http://rtlsdr.org/softwarewindows Zagdig USB driver Sdr-install.zip SDR Presentation - Cliff Pulis, KE0CP 30
SDR Presentation - Cliff Pulis, KE0CP 31
SDR Presentation - Cliff Pulis, KE0CP 32
SDR Presentation - Cliff Pulis, KE0CP 33
The Elecraft KX3 10-watt Transceiver SDR Presentation - Cliff Pulis, KE0CP 34
Part Radio Shack # Cost Dongle / Stick: Realtec or Raphael, etc. $10 - $29 RANVerter 2.0 HF Up-Converter $36.90 Radio Shack Project Box 5-1/4 x 3 x 2 270-0238 $3.49 Size M DC Power Jack 274-1563 $3.49 Size M DC Power Plug 274-1569 $3.49 Chassis Mount SO-239 Connector 278-0201 $4.19 2 ea. F Connector, 75-Ohm Chassis Mount 278-0212 $2.39 SPST Mini Toggle Switch 275-0634 $3.19 20mm PC Board Standoffs 276-195 $1.99 1 RG-6/U Coax Cable with F connectors 150-0020 $5.69 Total Radio Shack Parts $24.43 Total Up-Converter & R.S. Parts $61.33 SDR Presentation - Cliff Pulis, KE0CP 35
Send me an email and I will send you the parts list and information on downloading the software: president@kc5our.com SDR Presentation - Cliff Pulis, KE0CP 36