Antennas:

  1. Trio Star antenna for 2m in PDF - trio star antenna.rar (470kb)

  2. L/2 antenna 

  3. JPOL antenna for packet radio

  4. 6/9 element VHF YAGI

  5. 9 element YAGI antenna for 2m band
  6. 75m antenna tuner
  7. 16 element YAGI for 20m and 70cm
  8. 70cm vertical antenna
  9. HF antenna tuner
  10. Duplexer filter for 2m and 70cm dual band antenna
  11. 5/8 vertical antenna for 2m
  12. JPOLE for 440 MHz
  13. Super JPOLE antenna
  14. A Feasible Full Sized 40 Meter Beam
  15. A DISCONE antenna project
  16. Logperiodic dipole array
  17. Multi Band Antenna Traps
  18. 6 Element 1255 MHz Yagi for portable ATV use: about.txt, pic1, pic2, pic3, pic4, pic5

 

 

Audio aplications:

  1. AF power amplifier with TDA 2002
  2. AF power amplifier with LM386
  3. Speech processor with elektret mike
  4. Simple audio preamplif for electret mike
  5. CM microphone preamplifier
  6. i-Fi AF Preamplifier
  7. Microphone preamplifier and filter
  8. SSB and CW filter, AF amplifier
  9. Automatic Gain Controll
  10. Mike compresser
  11. Simple audio preamplifier
  12. Audio preamplifier with LM358
  13. Low noise, high gain microphone amplifier
  14. HF Receiver Tone converter New

 

 

Fox hunting:

  1. Fox hunting trcvr control unit with Microhip PIC microcontrollers

  2. 80m fox hunting receiver

Frequency meter, digital scale:

  1. Digital scale with PIC 16F84
  2. Frequency meter with PIC 16F84
  3. Universal frequency counter & voltage meter (link)
  4. Second generation of universal frequency counter & voltage meter (link)
  5. 3.5GHz prescaler (divide by 1000)
  6. CMOS frequency meter

Generator:

  1. Marker generator with PIC 12C509
  2. Marker generator with PIC 16F84
  3. Tone generator with PIC 16F84

Keyers:

  1. Morse Code Speedometer using the PIC 16F84

Measuring:

  1. RF signal meter with LED
  2. Single chip digital voltmeter with ICL 7129ACPL
  3. Inductance meter
  4. S.W.R. meter
  5. 2400MHz signal source
  6. DVM with ICL7107 - dvm.zip
  7. Antenna analyzer 88-960MHz

Misc.:

  1. AM/FM FAX interface :  GIF1  /  GIF2  /  GIF3  /  GIF4  /  GIF5  /  GIF6

  2. Antenna changer

  3. PC DTMF decoder with M8870 IC :  GIF1  /  GIF2  /  Decoder program  /  readme.txt

  4. Antenna rotor

  5. Universal PTT for digital communications using a sound card
  6. Wide range gate DIP oscillator
  7. Collection of quartz crystal ladder filters by S56AL (link)
  8. RF Calculator for Microsoft Excel spreadsheet program
  9. RF Isolator Uses Differential Amplifiers
  10. Tiny Crystal Oscillator with NC7504M5 single-gate AC logic and LP2980 low-dropout 3.3 volt regulator
  11. Low Distortion Crystal Oscillator
  12. Battery Monitor with PIC16C71
  13. A low-cost high-performance RF-powersensor
  14. High Fidelity FM Stereo Modulator Circuit : Pictures and PostScript files
  15. Basic RF oscillator

Packet radio:

  1. "Cheap"  1k2 packet radio modem

  2. TNC2 -  version by my friend HA8FY (Zsolt) 

  3. The most simple radio modem for RTTY, CW, SSTV

  4. 1K2 packet radio modem with TCM3105

  5. 1k2 packet radio modem with TCM3105 (vers2)

  6. 1k2 packet radio modem with XR2211

  7. 1k2 packet radio modem with FX614 (MX614) - schematic

Power amplifier:

  1. 2m power amplifier by LA0BY/DF9PY
  2. 50MHz power amplifier by JH0WJF
  3. 80m hexfet power amplifier by W7ZOI
  4. High dynamic range RF amplifier
  5. 1296MHz high gain amplifier
  6. 432 MHz kilowatt amplifier by W1QWS
  7. 60W solid-state UHF linear power amplifier (for 432 MHz) by K2OVS
  8. 350W QRO with GK71 for 160-15m
  9. 100W HF linear amplifier with MRF454
  10. 100W HF linear amplifier with GU50
  11. One Watt Class-C Amplifier
  12. 10w HF amplifier with KT907
  13. 1w HF QRP
  14. 25w QRO with PL504
  15. 5w QRP with KT907
  16. 13cm power amplifier
  17. Converting a PCS Power Amplifier to 13cm Ham Radio Band
  18. 23cm 40W PA with M57762
  19. 23cm 20W PA with M57762
  20. 15W amplifier with MRF136

Power source:

  1. Finesse Voltage Regulator Noise
  2. 13.8V/65A power supply
  3. 1.25-25V/2.5A power supply
  4. 13.6V / 10A power supply
  5. ±0-28V power supply
  6. 13.8 V / 15 A from a PC Power Supply
  7. Car NiCd Charger
  8. 1.2-30V/1.5A variable regulated power supply
  9. 12V/6A power source
  10. The smart switch

RF Preampliers:

  1. 2 Meter GaAs FET Preamp by KD9JQ

  2. U310 FET preamplifier

  3. 23 cm GaAs FET Preamplifier

  4. Generic High Gain 3 Stage IF amplifier
  5. Front end
  6. TS711A 1st IF amplifier ~ 16dB gain
  7. Wide Band High OIP, low noise amplifier
  8. 6m preamplifier by W1FB
  9. RF preamplifier by VE7GC
  10. 1296MHz GaAs FET Premplifiers
  11. 70cm Preamplifier
  12. Fet preamplifiers for 2m and 70cm
  13. Low noise preamplifier for 23cm
  14. Low noise preamplifier for 50 and 144 MHz
  15. Bandpass Filters

 

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RX:

  1. VHF FM receiver with TDA7000
  2. 80m direct conversion receiver by VK1PK
  3. Superhet receiver for 80m band by VK3YE
  4. 3-30 MHz AM receiver
  5. Ramsey 40m receiver
  6. 80m one chip receiver with NE602
  7. Simple 80 or 40m receiver
  8. TDA7000 FM receiver aplication notes and examples: page1, page2, page3, page4, page5, page6, page7, page8, page9, page10, page11

Synthesizers/VFOs:

  1. CMOS RF synthesizer
  2. DDS synthesizer kit
  3. DDS VFO
  4. 10.1MHz VFO
  5. DDS / PLL based universal synthesizer by S56AL (link)
  6. 144 MHz DDS
  7. HT220 frequency synthesizer by WA4DSY
  8. 3 band VFO (160-80-40m)

 

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Transceivers:

  1. 2m FM transceiver  in PDF - 2m.rar (880kb)

  2. 70cm WBFM transceiver for packet radio by YO5CRI in PDF - 70cm.rar (510kb)

  3. (SUPER!) T7F - 70cm FM/FSK transceiver by Holger Eckardt, DF2FQ
  4. Voice Operation with the T7F
  5. User interface for T7F
  6. 19200Bps with the T7F
  7. Schematics and PCB's for T7F
  8. Terminal for programming the T7F
  9. 20m 10W SSB transceiver by JF1OZL
  10. 160m 6W CW transceiver by JF1OZL
  11. 80m 5W CW transceiver by JF1OZL
  12. 80m 10W SSB transceiver by JF1OZL
  13. 70cm QRP SSB transceiver by JF1OZL
  14. Simple 70cm QRP FM transceiver by JF1OZL
  15. Simple 6m CW transceiver by VE7GC
  16. 40m transceiver by K8IQY: GIF1 , GIF2 , GIF3
  17. Pocket sized 20m (or 30m) single band 4W CW transceiver by S56AL (link)
  18. 80m 5W SSB/CW transceiver by S56AL (link)
  19. 6m SSB/CW transceiver by S56AL (link)
  20. 3W FM transmitter
  21. 3 band HF transceiver:
  22. 14 MHz SSB 10mW transceiver by JF1OZL
  23. 3.5MHz SSB 10w transceiver by JF1OZL
  24. 50MHz 10mW handy transceiver by JF1OZL
  25. 430MHz SSB transceiver by JF1OZL
  26. 7MHz CW transceiver with MC3362 by JG1EAD
  27. HF all band SSB-CW transceiver by JG1EAD
  28. HF 5 bands SSB-CW transceiver by EI9GQ
  29. 13cm 50mW ATV TRCVR
  30. 23cm 1.5W ATV TRCVR
  31. Low-cost ATV 23cm preamp with CF300
  32. Wideband FM 10GHz transceiver with 30MHz IF
  33. 2.3GHz ATV transceiver
  34. 23cm FM ATV transceiver by S51KQ: pic1, pic2, pic3, pic4
  35. 13cm FM ATV transceiver by ON7IZ: pic1, pic2, pic3, pic4
  36. VHF NBFM Single Channel Transmitter using MC2833
  37. 88-108MHz FM exciter
  38. Simplest RF transmitter (wireless microfone)
  39. Simple tracking transmitter with transistor
  40. Simple tracking transmitter with LM3909 IC
  41. Miniature FM transmitter (wireless microfone)
  42. Miniature FM transmitter (wireless microfone)
  43. Miniature FM transmitter (wireless microfone)
  44. VHF NBFM Single Channel Transmitter using MC2833
  45. 144MHZ tranceiver by IK3OIL, Francesco Morgantini
  46. “Grid Dip Oscillator” (GDO), by Giuseppe I3FNG
  47. A PIC16F876 based, automatic 1.8 – 60 MHz SWR/WATTmeter

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