Amateur radio station since 1993
RA3WDK `s Homepage , Technique & Proects
Power supply "POWER ICE 30A" v.3
Easy 12v Battery Charger with Power supply "POWER ICE 30A"
Power supply "POWER ICE 30A" v.2
My Old Power supply , Transistor IRFP 048 , IRFP 054 , IRFP 064
Low Pass Filter for 35 MHz (tested with 1kW)
My transverter 144/28 with high dynamic range
Transverter with high THREE-SIGNAL DYNAMIC RANGE :
- Local oscillator (with temperature-compensated) 116 MHz. Phase noise LO is better -150 dBc/Hz at shift of 10 kHz and better -145 dBc/Hz at shift of 1 kHz !
LO for all my XVTR (144,432,1296,6cm and 3 cm) by UA3AOH !
- High IP3 Level frequency mixer SYM-18H (Mini-Circuits, LO +17dbm)
- High IP3 level in the receiver low noise stage with 2xBF981 and BFG591
High selectivity with 4-stage helical band pass filter (from FM-301 Hungary FM stations) - more 70 db rejections outband 144-146 MHz. Also final low pass filter rejection spurious and harmonic of more than 60 db (filter LPF also from FM-301 with modifications).
Different between PRO Version and Light Version - in "Pro" use second unit for only TX-stage : second filter , TX stage and second high level mixer. In "Light" single filter and mixer use for RX and TX.
The TX power of the transverter can be adjusted with the potentiometer on the front panel - adjusted high level balanced stage 2xBF961(981) .
PA: use RA13H1317M
about output 20 W , Circuits level control : 2...20W
The output power, input IF power and SWR is indicated on a meter in front panel.
Modifications 2011 :
- new design TCXO for LO unit
You can see fabrication stages similar to mine XVTR for RA4SD
PA module RA13H1317M power out 30W
PA for 1296 MHz 2xRA18H1213G and 4xRA18H1213G
You can see Circuit this PA 1296
PA mounted in dish 1296 MHz (FieldDay 2009)
In 2008 year i started project with 4 module RA18H1213G (power supply SE-600-12), this project for RK3WWA
My new LNA for 1296 MHz, Nf < 0,4 db, ATF54143
To take one choice configuration sistem for 1296 MHz
Modification russian ferrite isolators for better isolation and min insertions loss with good VSWR
I add second magnet up top regular magnete - see in photo :
Best perfomance in 1296 MHz insertions loss<0,2 db , isolation>30db , VSWR < 1,1
More info about Isolators & Circulators (datasheets for Russian isolators & circulators)
Touch Paddle CW Key