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
Oct 3, 2009 Ham radio
Ham radio electronic kits
Ham radio links related to kit building projects. Many ham radio operators enjoy building transceivers, tuners, keyers, and other kits and homebrew projects.
- K12 Keyer IC and Kit – The K12 replaces the very popular K10 and K10+ keyers which have been shipping for almost ten years now.
- K10+ Keyer IC – The K10+ is a Morse keyer I.C. with lots of built in features only found in high end keyer I.C.s.
- K-ID and K-ID2 – This chip is designed expressly for dedicated beacon or CW identifier applications. It is very flexible and has the advantage of a very large message storage bank (512 bytes) which is non-volatile.
Tags: Ham radio
Oct 1, 2009 Ham radio
HamSphere 2.0 beta should be release today.
Kelly Lindman announced on his website that we’ve to wait some more days to get the latest HamSphere 2.0
Hamsphere virtual transceiver features going to be:
- Brand new appealing Radio skin with true VFO.
- Multiple skin options. Currently two skins available. (See Bill Walch HS 2.0 version here)
- Improved DX cluster
- Simulation on/off switch
- Improved warning system / Ban / Kick
- Dual filters
- Memory channel / VFO operation
- Fast direct frequency to band setting.
- Realistic VFO with 10 hz resolution.
- Progressive VFO for fast and reliable tuning.
- Fully implemented jitter buffer to minimize audio latency. Can be switched off for fully reliable audio stream.
- TCP protocol transport. Will work through most firewalls (unless it’s blocking outbound traffic)
- Single channel NAT-friendly TCP/IP operation.
- All HAM bands included: 10, 15, 20, 40, 80, 160, WARC bands + BC band.
- Better audio compressor.
- Better audio bandwidth (up to 4 kHz).
- 32kbit audio codecs (Application will require 32kbit up and down stream).
- Fully realistic analogue S-meter with dB scale.
- Instant band shifting
- Improved bandscope.
- Improved Ionospheric simulation.
- Same modulation technique as before. Hamsphere uses Digital Local Oscillators and true DSB modulation.
- Limited tranceiver for guests (Limited band, power and filters)
- Subscribers enjoy; DxCluster, Full power, unlimited bands, audio codecs, noise free bands if needed.
- Subscriptions only for real hams and serious “11 meter DX ers” that have to pass a test and a user agreement.
- Broadcast band for broadcast people. Will not interfere with QSO bands.
- Robots will be on demo and DX bands only. No QRM on rag chew bands.
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