Radioamatorism - István Ványi

Posts Tagged ‘Radioamatorism’

Transceivere Homemade

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:

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

Circuit schematic of the local oscillator unit
80m transceiver site panel

Schematics diagram are available: homebrew transceiver

T03DSP High Performance Transceiver with DSP IF processing

T03DSP transceiver

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.

Features

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