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The El Cuatro is a 4 band QRP FM transceiver that covers all bands from 1-6 Ghz (23cm,13cm,9cm,6cm)
and can be programmed to any legal frequency band. A cover story about the El Cuatro is featured in the DUBUS magazine 3/2018, article is here:
El Cuatro, El Cuatro 2.0 and El Cuatro 24Ghz
El Cuatro, FM Transceiver for 23,13,9 & 6cm - Article in DUBUS (German+English)
The El Cuatro 2.0 is a 5 band QRP FM transceiver that covers all bands from 1-6 Ghz AND the 3cm band (10.368Ghz).
The El Cuatro 24 is a 1 band QRP FM transceiver that covers only the 24Ghz band, but
can also be used as signal generator from 21 to 25,7 Ghz.
El Cuatro, the 4-Band Version - 23,13,9,6cm - Article in QSP (German)
El Cuatro 2.0 the 5-Band Version - 23,13,9,6,3cm - Article in QSP (German)
Circuit diagram of El Cuatro - early 4-Band Version
(This is a snapshot of one of the early 4-band versions (EC3) with seperate RX and TX antenna connectors)
El Cuatro 24 GHz Version 1 mW - Article in QSP July 2018 (German)
Why is there so much UHF/SHF activity in carinthia (OE8)? (English)
The EC22/EC22r is the newer Version of the 4-band EC20/EC20r, with a new antenna pin diode switch
for better performance at 9cm and 6cm.
The EC22/EC22r Kit is available for shipping starting at November 15, 2018.
Kit content looks like picture below, DRA818V and LCD might be already installed.
The PCB with all SMD parts is already finished, programmed and tested, you have
to connect the switches, battery case and some cables, possibly drill some holes.
Please choose EC22 or EC22r (with or without onboard DRA818v receiver).
* EC22r (with DRA818v receiver on board): 249.-
* Shipping to EU countries: 15.-
Prices are in EUR and include VAT.
Shipping is now (2018) only available to EU member countries.
In Austria the EC22r kit is also available through a workshop:
Next workshop is Dec. 8, 2018 in Vienna.
The 5-band version will be significantly updated and will be published in Feb. 2019.
If you are interested, please send email to
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