RTX109 - SM0JZT

RTX109
9 Band CW/SSB, 10 W Transceiver
The RTX-109 is an amateur band ssb/cw transceiver with a direct digital synthesis VFO/display to a 1 Hz
resolution. The VFO master uses the AD9851 DDS clocked at 180 MHz, with phase locked narrow band
voltage controlled oscillators, covering the 1.8 through 28MHz allocations. Construction is of a modular form to
allow budget building starting with a basic receiver and building up to a full power transceiver. A ring mixer RF
board, with a Level 17dBm option, insures a front end capable of dealing with even 7 MHz night time QRM. To
maintain the high IP3 there is a switched RF pre-amp using quad fets. The xtal filtered IF module features
passive audio filtering with a TDA2003 audio amplifier on receive and a SSM2166 speech processor on
transmit.
The front panel is an DRAKE-look-alike design .... On top of the rig is a wattmeter from LDG-electronics.
Modules for this project where obtained from Sheldon Hands in Wales.
Phone:
+44-1239 698427
URL:
http://www.rf-kits.demon.co.uk
Email:
hands@rf-kits.demon.co.uk
Lots of hard work has been done by to fault find and change the design together with Sheldon. Most of the
modules where in beta stage when I got them.
More information on QRP-building can be found on Club stations SK0PT:s homepage: www.qsl.net/sk0pt.
If you have any questions. Please do not hesitate to contact me for guidance around this and other projects.
SM0JZT Tilman D. Thulesius +46-8-581 71033 tilman@algonet.se
On the following pages you find pictures and schematics for the different modules used.
9 Band SSB/CW, 10 W Transceiver – SM0JZT
Page 1 of 7
Here you have a picture with the main boards of the rig. Boards top left to bottom right:
IF-board, PLL-board, Control-board and Mixer-board.
9 Band SSB/CW, 10 W Transceiver – SM0JZT
Page 2 of 7
The IF-board includes on the top right the mic-amp and speech processor SM2166 by analog devices. To the
left of the 2166 you see the MC1496 modulator.
Down left to right you see the receivers IF strip with 2 x MC1350 amplifiers. The LF amplification is done in a
TDA2003. On the board you also see the 2.2 KHz X-talfilter and the BFO-xtals.
TX-chain, IC 9 = MC1469, IC 7 = SSM2166
RX-chain, IC1,2 = MC1350, IC4=TL072, IC5=NE602, IC6=TDA2003
9 Band SSB/CW, 10 W Transceiver – SM0JZT
Page 3 of 7
The mixer contains a TUF1H ( 17 dbm ) on the mid left. The rest of the board contains bandpass filters.
MMIC:s provide amplification of VFO-signal and TX driver levels.
IC1 = TUF1H 17 dBm mixer, IC2 – 6 = MMIC-amps
9 Band SSB/CW, 10 W Transceiver – SM0JZT
Page 4 of 7
Here you have a cutout from the DDS-VFO-board. To the left you can see DDS-processor 9851 by Analog
Devices. To the right you see the control PIC-processor. All these components are soldered with a normal
soldering iron. Skills are needed though bearing in mind the DDS-IC being about 10 mm long....
9 Band SSB/CW, 10 W Transceiver – SM0JZT
Page 5 of 7
The cleanup of the DDS-VFO is done in this PLL-board. the GQPL9-board.
IC1 = NE602 Mixer, IC2 = 74HCT4046 Comparator, IC3 = TL072 Amp, filter
9 Band SSB/CW, 10 W Transceiver – SM0JZT
Page 6 of 7
Here you find the PA-board. Gives about 10 watt output. To the right you have the lowpassfilters. On the bottom
you can see the preamp consisting of 4 x J310 FETs in parallel. The IC:s are for the bandswitch control.
TR2 – 3 = VN66AF, TR5- 8 = J310
9 Band SSB/CW, 10 W Transceiver – SM0JZT
Page 7 of 7