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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 currently available only at "El Cuatro kit workshops".
The PCB, with all SMD parts is already finished, programmed and tested, is mounted into
the case, the switches, encoder, battery case and some cables are connected.
Price: EC22r (with DRA818v receiver on board): 249.-
Price is in EUR and include VAT.
Next workshop is in Graz, Austria: Sat., 18.5.2019.
Typical technical data for EC22r:
Power output on 23cm, 13cm, 9cm: 18dbm
Power output on 6cm: 10dbm
Frequency stability: better than 0.3ppm
RX noise figure: better than 7db
If you are interested, please send email to
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