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YU1LM/QRP site navigation new from last site update o Why QRP? o QRP Contests by YU1LM/QRP o Homebrew o Classification SDR projects o YU1LM SDR clasification o DC (direct conversion) receivers o DC RX-YU1LM Serbian o DC RX-YU1LM English o DC (direct conversion) transmitters o Audio phase shift networks o Filters o Tunable crystal filter o Tunable HF BP 2-30 MHz o Band pass 1.8 MHz o Band pass 50 MHz o Band pass 144 MHz o TX BP HF/6m ver1 o TX BP HF/6m ver2 o TX BP HF/6m ver3 o RX BP/LP HF/6m o AVALA TX BP/LP HF/6m o LP/BP for 100-500kHz o HF Multiplexer Filters o HF SDR receivers o DR1 o DR1A o DR2 o DR2A o DR2-2 o DR2B o DR2C o DR2D o DR2E o DR2G o DR2A+,DR2A++ o DR2F+,DR2F++ o DR2H+,DR2H++ o DR2I+,DR2I++ o DR3X o HF SDR transmitters o DT1 o DT2 o DT2A o DT2A1 o HF SDR transceivers o ADTRX1 o AVALA-0 1 o VHF/UHF receivers o AR1 o AR1B o AR1C o RF/SDR accessories o HF/VHF oscillators o CMOS SDR oscillator o Complementary designs o Synthesizer RZ6HY o Miniwhip PA0RDT o OK2CPV SMT receiver o Events, SDR workshops o HOME 10258 visitors on QSL.NET since 4. Dec . 2002 You are visitor classifiedads.com since 5.April 2006 E-mail t asa yu1lm @ gmail .com tasa@insimtel.com W elcome to Amateur Radio Site Devoted to Homebrew, QRP and Low Power Contesting YU1LM/QRP Tasić Siniša- Tasa Petefijeva 41/15 11030 Beograd SERBIA tasa yu1lm @ gmail .com tasa@insimtel.com NEWS - all new articles from the last update have new or SEPTEMBER 2010 HOMEBREW Three years passed like a moment . I kept on with designs but I stopped publishing reason was unauthorized copy of my work from some people and companies too without any obligation to me. I left all almost in the maximum of my frustration in 2008. When I started cooperation with Nick VK1AA and Genesis company www.genesisradio.com.au in 2009 I change my decision. You can see at Genesis site what I designed new for Genesis SDR transceivers.... I decided to publish some new articles written in meanwhile but not transceivers as support for the all people who had been writing to me in over 1500 E-mails which I received and who ware sending me photos of their realization of my designs. Please take care about my author rights I am publishing all for personal use only at site not for making business without my permission. Thank you to all who asked me for permission for non profit projects and work shops and for all who sent me support in IC samples... 1.SDR HF I/Q S/H receivers DR2H+ and DR2H++ have DR (dynamic range) IMD3 free close to the 100dB with SMD substitute Philips IC 74LVC4066. DR2H+ and DR2H++ are going from 30 kHz to the 75(110) MHz without input filters!! 2. SDR HF I/Q S/H receivers DR2F+ and DR2F++ have now DR (dynamic range) IMD3 free 100dB with SMD substitute Philips IC 74LVC4066. RX MDS is -137dBm. DR2F+ and DR2F++ are going from 30 kHz to the 35(55) MHz without input filters!! 3. SDR HF I/Q S/H receivers DR2I+ and DR2I++ have now DR (dynamic range) IMD3 free 100dB with SMD substitute Philips IC 74LVC4066. RX MDS is -137dBm. DR2I+ and DR2I++ are going from 30 kHz to the 75(110) MHz without input filters!! 4. AVALA-01 corrections 5. HF/6m TX/RX band pass filters with 3 equal coils ver1-ver3 6. HF/6m AVALA-**,Genesis transceivers BP/LP filters 7. HF/6m RX input filters with standard coil values 8. SDR HF receiver DR2 E PCB correction 9. SDR HF receiver DR2G PCB correction 10. SDR HF receiver DR2 A+ PCB correction and DR2A++ assembling correction 11. SDR CMOS multiple frequencies oscillator 12. LP and BP filters for low frequencies from 100-500kHz 13. HF SMT SDR Receiver Based on DR2A+ designed by OK2CPV 14. HF Multiband Multiplexer filters for transceivers 14. New SDR photo gallery OCTOBER 2007 HOMEBREW 1.SDR HF I/Q S/H receivers DR2A+ and DR2A++ has now DR (dynamic range) IMD3 free close to the 100dB with SMD substitute Philips IC 74LVC4066. DR2A+ and DR2A++ are going from 30 kHz to the 52 MHz without input filters!! 2. SDR HF receiver DR2G. DR2G is my first completely SMT SDR receiver. The SDR RX DR2G goes from 30 kHz to the 70(100)MHz without input filters!!!! 3. ADTRX-2 is new version of my low power SDR transceivers ADTRX1 and ADTRX1-1. The new mono-band QRP SDR HF transceiver AVALA-01 is ADTRX-2 transceiver with added QRP power amplifier and built in band oscillator all on one single side PCB board. Transceiver is optimized for unique PC control in all software. 4. Low power SDR HF I/Q S/H (Sample and Hold) transceiver based on use 74HC4053- ADTRX1 goes from 30 kHz-35 MHz with new boards B3 and B4. Transmission is possible at 3 bands harmonically related. The boards have built in 4 channel crystal oscillator with QRP 5Wout power amplifier with LP/BP- part 3 5. I translate original articles about DC (direct conversion) receivers from Serbian language to the English and I added some photos of realizations. 6. Article with classification all YU1LM/QRP SDR designs 7. This design is good and small active antenna built by Reolof Bakker PA0RDT & Aldo Moroni. Every my SDR RX can now receive weak signals in HF range without big antennas. 8. New SDR photo gallery + links related to my design JANUARY 2007 HOMEBREW 1. Low power SDR HF I/Q S/H (Sample and Hold) transceiver based on use 74HC4053 - ADTRX1 from 30 kHz-35 MHz with external LO - control boards B1 and B2- part2 2. SDR HF I/Q S/H receiver DR2-2. The DR2-2 is DR2 modification of HF SDR receiver without any RF parts. DR2-2 has no coils only R,C and cheap ICs but it is with outstanding performances. 3.SDR HF I/Q S/H receiver DR2D. The DR2D SDR RX is DR2B, DR3X modification with possibility to work with 2 times higher LO frequency instead usual optimal 4 times higher . This receiver is working to the maximum input frequency of 50 MHz. With common used AD9850 DDS we can receive 30 MHz without problems with DDS REF frequency of 125 MHz. 4.SDR HF I/Q S/H receiver DR2E. DR2E is DR2 modification with new post detector amplifiers to improve performances of original design. 5. SDR HF receiver DR2A additional measurements - Tasa YU1LM& Norbert DG1KPN 6. Corrections in previously published my SDR designs 7. AF all pass quadrature networks - old technique effectively revised 8. 3 Band pass filters for 50 MHz ( 6 m ) band 9. Band pass filters for 144 MHz ( 2 m ) band 10. HF/VHF/UHF SDR receivers part1. I describe some theoretical problems in realization and a I describe a couple SDR receivers without image rejection. 11. Universal crystal HF/VHF oscillator with possibility switching 4 crystals. This is attempt to help SDR fans in LO realization for my SDR projects. 12. New SDR Photo gallery JULY 2006 HOMEBREW All 4 new design are based on use 74HC4053 IC as S/H (sample and hold ) element in demodulators , modulator and transceiver. 1. SDR HF I/Q S/H (Sample and Hold) Receiver-DR3X from 30 kHz-35 MHz for 3 bands harmonically related with 1(one) oscillator or 1 XTAL 2.SDR HF I/Q S/H (Sample and Hold) Receiver - DR2 B from 30 kHz- 35 MHz with external LO (local oscillator) 3.SDR HF I/Q S/H (Sample and Hold) Mono band Receiver - DR2C from 30 kHz- 50 MHz with LO (local oscillator) at receiving frequency 4. Low power SDR HF I/Q S/H (Sample and Hold) transceiver- ADTRX1 from 30 kHz-35 MHz with external LO- part1 5. New SDR Photo gallery 6. Forum devoted to my SDR design http://www.qrpforum.de/thread.php?threadid=987 APRIL 2006 HOMEBREW + QRP Contests 1. BP 160M Photo and corrected article 2 . My QRP Contest philosophy and some my results in contests MARCH 2006 HOMEBREW 1. SDR Photo gallery 2. Band pass filters for Top band -160m JANUARY 2006 HOMEBREW HAM S/H Sample and Hold SDR (Software Defined Radio) Modulator/Transmitter for DSB, SSB, CW, AM, FM, DRM.. On HF (30 kHz to 70 MHz) in Connection With PC Sound Card or Other Audio Source – Make it Simple as Possible with Outstanding performances - part2 FINAL SOLUTION – Optimized HAM S/H Sample and Hold SDR (Software Defined Radio) Receivers, Modulator/Transmitter for DSB, SSB, CW, AM, FM, DRM . HF (30 kHz to 70 MHz) in Connectio...