|
|
Cricket
Text size too large or small? Use your Ctrl key and scroll wheel to adjust it.
.
Kitted and Offered For Sale By The Four State QRP Group
The Cricket is a low cost entry level minimalist CW transceiver for the 80 meter band. Chosen as the build session kit for OzarkCon 2017, it bears
a family resemblance to the well known but much lower performing Pixie. However it is very different and vastly improved over the Pixie.
This is NOT a Pixie, it is far superior! It features low parts count, better components including MOSFETs for better sensitivity and switching,
and a modern NJM2113D audio amp.
A TX/RX offset is also incuded so that you can work other stations that have zero beat you, or are using a
crystal on the same frequncy. Full QSK and a sidetone complete the essential operating features. Dave's famous etched spiral coils are included
on the pc board, so there are NO TOROIDS to wind. Additionally a straight key is included on the pc board, just snap it off, mount it on the board,
and the whole rig is then self contained. Also included is an electronic keyer adapter - you can use your favorite keyer with the Cricket!
These are many features for such a low parts count and inexpensive transceiver.
ALL THROUGH HOLE parts make this kit very easy to assemble. It will make a fine, fully functional, and educational first rig for a
new builder, the new ham, or seasoned veterans wishing to just have fun with a new rig at minimal expense and effort. Note that Novices and Technicians have 80M CW
privileges from 3.525 to 3.600, same as everyone else - so they also can build and use the Cricket.
This simple rig is fun and functional, and made many contacts at OzarkCon after the build session. A proven design and a great choice for your
next rig, it is perfect for a group build with nets and contacts after the build. This is an excellent club project.
Clubs and Groups Please Note! Group discounts are available, 5 kit minimum order required. Contact the kitter at the
email address below.
Join the Cricket Society! Earn Awards! Experience the comaraderie of the Cricket! More info here.
Specifications and Design Features
General
Transceiver: Fully functional transceiver.
QSK Yes! Full QSK with fast, high speed switching.
TR/RX Offest: Yes! Can hear a zero beat station, with no offset they wouldn't be heard.
Sidetone: Yes! Great keying aide, unusual in such a low parts count rig.
Low Part Count: Only 36 total electrical components (the Pixie has 34).
NO Toroids: NO toroids to wind, all inductors are etched on board spiral coils..
Reverse Voltage Protection: Battery clips prevent reverse connection.
Self Contained: Both the battery and a straight key are board mounted.
Keyer Adapter: An electronic keyer adapter is included - use your favorite keyer.
Single Bander: 80M only.
Crystal Controlled: A 3579 KHz color burst crystal is included in the kit.
Fast Assembly: Approx. 1 hour for an experienced builder.
No Alignment: None needed, put it on the air immediatly after assembly.
Size: The board is 6" x 3.5" including a 1/2" snap off piece that becomes the board mounted key.
Power Supply: 9 volt on board battery.
Current requrements Receive: less than 10ma, Transmit: less than 80ma.
Receiver
Direct Conversion: No 60 cycle hum or AM BCB interference at most locations.
Sensitivity: Minimum Discernible Signal (MDS) -110 dBm (~S3) well below the normal 80M noise level.
MOSFET Mixer: Far superior to the Pixie's NPN mixer - better immunity to AM broadcast interference and 60 Hz hum.
Current Requirement: Less than 10ma (!).
QSK: Full QSK.
Audio: Modern audio IC amplifier. Sounds good, and plenty of volume for headphones/earbuds.
Transmitter
Chirps NOT Included Most Crickets chirp :o) this one doesnt.
Power Output: ~1/2 Watt
Final Amp: 2N7000 in Class E for cool efficiency. No heat sink needed.
Spectral Purity: All harmonics and spurs are 50dB or more below the carrier.
Current Requirement: Less than 80ma.
Robust: Will transmit into an open antenna jack with no damage.
Documentation
Assembly Manual
Schematic
Board Layout Part location.
Part List BOM
Photo Page Rig pix, part ID, and building tips.
Introduction to the Cricket by NMØS
Become a Cricketeer! Click here to join the Four State Cricket Society.
Elecraft's Excellent Capacitor Identification Page Posted with permission.
Electronics 2000's Excellent Resistor Code Graphic Calculator Posted with permission.
The Cricket is carefully kitted and shipped by Gary Lyons, WØGX
Please direct shipping, kit, and part related questions to Gary
All proceeds are applied toward funding OzarkCon. Thank you for supporting The Four State QRP Group.
|
