In 1992 I built a 23cm transverter consisting of two units:
1. UEK3 clone (we had the PCB layouts then ; -), i.e. 1152 MHz LO with 1296 –> 144 MHz RX converter
using a MGF1302 GaAs fet preamp and CF300 mixer.
2. DJ9HO (sk) ‘UHF Unterlage’ or DD9DU style 144 –> 1296 MHz TX converter (output 500 mW @23cm).
Below pictures of my homebrew units are depicted (click on images to enlarge in new tabs)
This transverter served and worked well for some years with a Mitsubishi M57762 module, delivering ca. 17W out on 23cm.
However, when I moved to Groningen in 1997 the transverter landed in a box and remained there for almost 20 years.
Recently I was philosophizing about a long term project: building a 23cm EME station.
I held the transverter in my hands and thought . . . isn’t there something more state of the art, after ca. 25 years passed by?
Let’s face it . . . over the past 20 years the world changed. GSM, DCS1800, UMTS and now LTE/4G is common practice.
These applications introduced new lines of RF technologies ‘around 1 GHz’, and here I’m standing with old skool gear in my hands?
In December 2014 Arie PAoEZ (sk) told me he bought a ‘Bulgarian 23cm transverter’.
When he told me I didn’t took much notice because I was more concerned about his health.
Around two months ago my friend Hans PE1CKK confessed he bought the same Bulgarian 23cm transverter and told me:
“Remco, quit the old stuff we used to build long times ago. It’s a nuisance, just buy this Bulgarian transverter and focus your
efforts and attention on other stuff.” <– period.
Google led me to the 23cm transverter from LZ5HP. Just one box with everything in it!
RF output on 23cm is around 2W. LO is generated by a PLL locked oscillatorwith several LO frequencies
and . . . repeater TX shift (-28 or -6 MHz) !
After pleasant emails with Hristiyan LZ5HP I payed 164€ via Paypal and
received the 23cm transverter after three days by mail (with track & trace).
Below a close up picture of the transverter is depicted (click on image to enlarge in a new tab <- worthwhile! ; -)
The transverter is versatile and works fine. After five (5) minutes you’re QRV on 23 !
At this moment of writing the current transverter version is v2.3.
It has the possibility of injecting an external 10 MHz reference signal instead of the internal 26 MHz TCXO.
I have tested this with my 10 MHz Rubidium standard and it works flawlessly.