Oct 4, 2009 Homemade
Homebrew measuring, control devices, instruments and RF spectrum analyzers by radio amateurs.
Keywords: homebrew, homemade, amateur radio, ham radio, control, device, RF, spectrum analyzer.
Measuring and control devices
RF Signal Generator
This signal generator is intended for realignment of radio receivers. The unit is cheap and fairly basic, but perfectly adequate for its intended purpose. However, the output is not a pure sine wave, so the unit may not be suited for more exacting electronic development work.
TR1 is a high gain FET (Field Effect Transistor) and is configured as a Colpitts style oscillator. The oscillation frequency is set by the variable capacitor (C1+C2) and the five pairs of switched inductors. There is significant overlap between the ranges, due to the limited range of readily available inductors. However even by using specially would inductors, four frequency bands would have been needed to cover the range.
Tags: Ham radio
Sep 29, 2009 Homemade
Homebrew SDR transceivers by radio amateurs.
Keywords: homebrew, SDR, transceivers, homemade, hamradio, amateur radio, block diagram, circuits, schematic, receiver, digital, module, kit, project, low cost, PIC.
homebrew SDR transceivers
HF SDR (Software Defined Radio) transceivers
HF SDR transceiver – YU1LM
Low power SDR HF I/Q S/H (Sample and Hold) transceiver CW,SSB.- ADTRX1 from 30 kHz-35 MHz with external LO
HF SDR transceiver called ADTRX1 (analog + digital) is compilation of the results and previously published designs. ADTRX1 is working to the 35 MHz and it is a very simple and promising design all with classic size thru holes components. It is very good introduction in to the new SDR technique of the HF transceiver design. Most of demanding specification for HF transceivers are in software now, not in hardware like in classic HF transceiver design. Part 1 is giving description main ADTRX1 board, results and basic connections
Schematics diagram are available: read more
Tags: Ham radio
Sep 17, 2009 Homemade
Homebrew transceivers by radio amateurs. Some of these are high performance transceivers, even they are homemade.
Keywords: homebrew hf, radio transceiver, homebrew ssb, homemade hf, homebrew vfo, homemade vfo, digital DDS, transceivers, homebrew hf transceiver, DDS VFO, ssb transceiver, homemade, hamradio, amateur radio, SSB, band, Single Sideband, USB, LSB, CW, receiver, transmitter, exciter, power amplifier, bandpass filter, automatic gain control (AGC), cw 80, ssb radio, homebrewing, QRP SSB transceiver, QRP CW, transceiver qrp, build ssb transceiver, 3.5mhz transceiver, HF all band SSB-CW, transceiver schematic, homemade hamradio.
Homemade HF transceivers:
- Multiband homebrew HF transceivers
- 160m (1.8 Mhz) homebrew transceivers
- 80m (3.5 Mhz) homebrew transceivers
- 40m (7 Mhz) homebrew transceivers
- 30m (10 Mhz) homebrew transceivers
- 20m (14 Mhz) homebrew transceivers
- 15m (21 Mhz) homebrew transceivers
- 10m (28 Mhz) homebrew transceivers
- Other homebrew transceivers
- Hambrew / homebrew / homemade links
- CDG2000 Transceiver
HF multi-band transceivers (homebrew)
Visit DXZone – Technical Reference – Ham Radio homebrew and home-made
The HF all-band homebrew transceiver by jg1ead
The home made transceiver covers 3.5 to 3.6 MHz and is CW only. It has the following features:
Characteristics and composition:
- Frequency coverage : 3.5MHz-28MHz 8band
- Mode : SSB/CW
- TX-final : 2SC1947
- Power output : 1W
- RX-RF amp : 2SK125*2(Grounded Gates)
- 1stIF : 48.7265MHz
- TX/RX 1st mixer : MiniCircuit MCL-1
- RX 1st IF amp : MC1350P
- 2ndIF : 11.2735MHz
- TX/RX 2nd mixer : MiniCircuit MCL-1
- RX-2nd IF : MC1350P*2
Schematics diagram are available: homebrew transceiver
T03DSP High Performance Transceiver with DSP IF processing
The goal of this project was to build a high performance HF transceiver with DSP IF processing. I did not try to archive as high parameters as possible, I just tried to get most from the available technology (i.e. mechanical and electrical parts and assembly technology). I tried to keep the design as simple as possible. The design widely uses “software” techniques that allows easy modifications and opens new possibilities.
- Amateur radio bands (160m,80m,40m,30m,20m,17m,15m,12m,10m)
- 0.25 Hz and more (two tuning speed for each mode is available), implemented adaptive tuning step (1x..20x)
- USB, LSB, CW (Normal/Reverse), AFSK, RTTY (decode only by now), (PSK31 with decoder and coder will be implemented in software later)
- Selectivity 100Hz-3000Hz bandwidth in 50Hz steps
- Automatic memory keyer (built in)
- Automatic contest number generation, 5 different number formats available
- Digital RX:S-meter and calibrated input signal power meter
- Digital TX:Output power, SWR and compression (displayed simultaneously)
- 24h real time clock (powered from ionistor during power off periods)
- AFC and tuning indicator in RTTY mode
- Adjustable voice operated squelch for SSB mode
- CAT system compatible with Kenwood command set
- Built in dual tone generator for transmitter testing
T03DSP audio amlifier
Schematics diagram are available: High Performance Transceiver
Tags: Ham radio
Sep 13, 2009 Homemade
Homemade antenna Design
HF multiband homebrew antennas
- G5RV Multi-Band Antenna
THE G5RV ANTENNA, with its special feeder arrangement, is a multiband centre-fed antenna capable of very efficient operation on all hf bands from 3.5 to 28mhz, specifically designed with dimensions which allow it to be installed in gardens which accommodate a reasonably-straight run of about 102ft (31.1m) for the “flat-top”.
- The W3FF Portable Dipole
This is the antenna I designed for my ‘walking portable’ station. It is a dipole constructed out of the plastic plumbing pipe CPVC. There are telescoping whips at the ends of each side of the dipole, and these whips are adjusted to bring the antenna into resonance on each of five HF Bands…..10, 12, 15, 17, and 20 Meters.
- Miracle Whip portable antenna
The whip described here will tune up to a respectable SWR on 40 metres and up.
- W5DXP’s No-Tuner, All-HF-Band, Horizontal, Center-Fed Antenna
This antenna is our old friend, the 80 meter halfwave dipole dressed up a bit. By varying the length of the 450 ohm ladder-line feeding the antenna, we can achieve an SWR of less than 2:1 on all frequencies on all HF bands