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Informations about: the 4-band UHF/SHF handheld QRP FM/CW transceiver are much simpler than you ever imagined:
El Cuatro 22, El Cuatro EC24 (24Ghz) and Hydra
(1) The EC20/EC22 transceivers
Only 2 Switches one Encoder, Antenna and Earphone connector
But you get 4 bands in one handheld FM transceiver:
a QRP FM/CW transceiver for 23cm, (1296-1300 Mhz)
a QRP FM/CW transceiver for 13cm, (2320-2322 Mhz and more)
a QRP FM/CW transceiver for 9cm, (3400-3402 Mhz)
a QRP FM/CW transceiver for 6cm. (5760-5762 Mhz)
(2) Hydra, 10 Ghz X-band SSB/FM/CW doubler/LNB SHF frontend
for ADALM-Pluto (tm by Analog Devices)
(3) EC24 the QRP FM transceiver PCB for 24Ghz -1.2cm Band).
Recently Published Articles:
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, 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). This device is no longer available due to too
much effort in time and constuction. If you are seriously interested in the 3cm band
please consider using a transverter (e.g. DB6NT).
The El Cuatro 24 (EC24) 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. Sorry, I have no other updates available, diagrams
got lost during an OS update.)
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)
* EC20/EC22: a few items are available to to active participants in
the Austrian Activity or Italien Activity Contest, I.A.C.
* Hydra V1 Prototype (PCB only) is currently in the making, please
send email if you are interested.
* EC24 (24Ghz FM QRP transceiver PCB) will be availabe soon via croundfunding.
Please send email to keep you informed.
NEW: The EC22/EC22r is the newer Version of the 4-band EC20/EC20r.
With an additional Power amplifier the QO-100 uplink can be used (CW only).
23cm repeater band (1298 Mhz -28Mhz) is included.
13cm repeater band (2400 Mhz +48Mhz) is included.
El Cuatro EC22 QRP UHF/SHF FM handheld transceiver, shown here with the
OE8WOZ ultra-wideband Vivaldi antenna.
Typical technical data for EC22r:
Power output on 23cm: 6dbm
Power output on 13cm+9cm: 18dbm
Power output on 6cm: 6dbm
Frequency stability: better than 0.2ppm
RX noise figure: better than 7db
NEW: Hydra V1 is a extension for the ADALM-PLUTO (tm by Analog Devices) also known as PlutoSDR.
learning Module, and enables the use of the 10Ghz Band (10368-10370 and 10400-10450)
Hydra V0 shown here attached to SMA to WR90 Adapter. The WR90 waveguide filters
the half frequency (5184Mhz) very well.
Typical power output is 1mW, Noise-Figure is around 10db. Mode is SSB/CW/FM.
Pluto must be set to (e.g.) 5184Mhz for TX and receiver must be set to (e.g.) 618Mhz.
There is now a seperate website for Hydra V1, V2 and other PlutoSDR modules, click
NEW: El Cuatro EC24, 2020 Edition. is a simple PCB with the BGT24LTR11 radar chip, which includes
the PLL needed for a stabilty. Microphone is included, and a simpler PTT-Jumper for
switching between RX and TX. Frequency for TX is always on 24049,500 Mhz,
EC24: 24Ghz FM Transceiver.
receive LO is on 24194 Mhz, which gives a IF Frequency of 144,5 Mhz.
A seperate receiver or SDR set to FM mode is needed for receive operation.
Typical power output is 1mW, the output is coupled into a corner-reflector arrangement
and can be mounted in a small satellite dish. Alternate versions (available on request)
have RX and TX on seperate SMA female connectors, where a external SHF-relay can be
connected. Noise-Figure is around 10db. Mode is FM only.
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