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Rock
Mite
CW
transceiver kit
R
ock-Mite
is a crystal-controlled
direct-conversion transceiver available for 80M, 40M, 30M or
20M. It features an on-board 8-pin PIC
microcontroller which controls a T-R offset on key-down. A brief tap of
a pushbutton control switch reverses the offset to yield a second
operating frequency. Pushing and holding on the pushbutton activates
the speed adjustment routine for the built-in Iambic keyer. If you'd
rather use an external keyer or straight key, there's a 'drop-through'
mode which allows use of an external keying source. You'll note in
the image above that the
Rock-Mite uses two crystals. The first is used in the local oscillator
for transmitter and receiver. The second is used as a receiver
front-end filter. This crystal significantly reduces the SWBC energy
present at the receiver mixer; as a result, unwanted SWBC reception is
dramatically reduced. The Rock-mite
uses one surface-mount part with
fairly large spacing. There are no toroids to wind, so assembly should
be a snap! The Rock-Mite uses subminiature epoxy-encapsulated RF chokes
instead of toroids. SPECIFICATIONS:
- Double-sided PCB 2.0" x 2.5",
plated-thru-holes, solder masked & silkscreened for easy
assembly - 0.5W power output at 12V supply. - Supply voltage range 8-15V AVAILABLE FREQUENCIES: 3560 kHz 3579 kHz 7015 kHz 7030 kHz (QRP calling frequency) 7040 kHz 7122 kHz (US Novice/Tech+) 10106 kHz 14060 kHz -automatic T/R offset, reversible -Built-in Iambic keyer, 5-40 WPM -Built in sidetone, 700 Hz - Includes assembly instructions and operating
tips - All on-board
parts supplied in kit (as pictured
above) For more information
visit : Small wonder labs This is my Rock Mite built on May 2004. I chose
the band of 14.060 MHz because I think that twenty meters are a good
band for QRP. I usually go on air with the 9V battery that allows to
have about 0.2 or 0.3 Watt of power! I suggest
to all OM to build Rock Mite because
it’s simply to do and it gives satisfaction.
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