Welcome on DL4UNY's Radio-Page!


...DL4UNY on 2m/70cm...


I didn't focus much on bands higher than 50MHz because I never had an outstanding QTH for VHF operation and the bit of 2m contest activity I did was just for fun, to work some friends. Therefore, I never used any special equipment to make QSOs on 2m, just used what was available.
I'm an RF engineer, working at Rohde&Schwarz, developing RF frontends and synthesizer for high class spectrum analyzers. Therefore of course I'm quite familiar with frequencies beyond 50MHz ;) and after some time I felt the strong need to design my own VHF/UHF Radio equipment. From the engineering point of view, a simple 28-144 transverter is very easy, but I didn't want anything thats already available on the market. I wanted to build my own high class bidirectional converters.
First, I wanted to design and build a stable low phase noise 116MHz source with high power output (> 17dBm output power) to work as LO for the following converter. It took me a while to find the right crystalls to do the job and eventually ordered customized 116MHz quartz crystalls from Axtal.
I designed a oscillator circuit for low phase noise and made a PCB which can be used as a submount or separate module for the next stage (converter, in my case)


Oscillator, heater and crystall are enclosed in a thick alloy enclosure:



By now, I have completed about 25 116MHz oscillator units and the plot below shows the typical phase noise of them:
1 Hz: > -50dBc
10 Hz: > -85dBc
100 Hz: > -115dBc
residual noise: > -165 dBc






Just message me in case you are interesed in purchasing an oscillator or parts.