JUMA TRX2 is a high dynamic range transceiver for SSB and CW, using the quadrature sampling technique for demodulation and modulation with the low noise phasing method. JUMA TRX2 includes a DDS controlled VFO for a good frequency stability and signal purity. An internal microcontroller is controlling all functions of the transceiver.
JUMA TRX2 is available as a discrete kit with components and bare circuit boards. The enclosure is machined and printed. Only few coils need to be wound when constructing JUMA TRX2. A completely assembled transceiver and other building help is also available with the help of the JUMA community.
Additionally there are two models: The two band model TRX2 for 80m and 40m ham bands and the all ham band model TRX2A with a general coverage receiver. The two band model can be upgraded any time into the all band model by adding related modules. Several add on option modules are also available for both models.
Alternate display pages
RF power indicator
SWR indicator
Supply voltage indicator
Drain current indicator
Configurable features
AGC Slow/Fast
LPF corner frequency setting
Speech Processor ON/OFF
Mic connector, input level MIC/LINE
Keyer Dot priority/Iambic-A/Iambic-B/Straight
RS232 mode TRX2/Yaesu CAT/Test functions
Display brightness/contrast
Service/calibration mode
Reference oscillator software calibration
S-meter software scaling
FWD power meter software scaling
Acknowledge tones length setting
Reload factory settings
Features
The all band model has all ham bands, RX 100 kHz-30 MHz
The two band model frequency coverage is 2 MHz...8 MHz
Transmit modes LSB, USB, CW and tune
Output RF power 10 W
RF output, SWR, voltage and PA current displays in LCD
Built in keyer: Dot priority, Iambic A, Iambic B and straight modes
Good clickless CW keying with adaptive 'VOX' time
Three filters: Wide, Medium and Narrow with a good shape factor
The filters are user adjustable, see the diagram here.
Outstanding dynamic range and good sensitivity
Excellent AGC with slow and fast modes
Dual DDS controlled VFOs with a split TX/RX function
First-class optical VFO encoder with 480 steps per revolution
7 digit frequency display with 10Hz display resolution
Three selectable VFO tuning speeds Slow/Fast/Very Fast
VFO lock feature
RIT with it's own tuning knob
Graphical S-meter range S1...S9+40 dBm
Non volatile memory for VFOs, modes, settings and calibration
Firmware
The most recent software updates will be available and users can easily upgrade the firmware without any special tools with the build in flasher utility and a PC serial cable. The control software (firmware) is written in the C programming language. Source code will be available for experimenters.
Power supply
Nominal supply voltage 13.8 VDC (range 11 VDC...15 VDC)
Nominal supply current RX0.4 A, TX 2.5 A
Dimensions:
Width 182 mm, Height 60 mm, Depth 185 mm
Weight:
1.2 kg (all band model), 1.1 kg (two band model)
sources: http://www.nikkemedia.fi/juma-trx2/
http://9w2dya.blogspot.com/
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