IZ1DFF  ITALIAN HAM RADIO STATION                                       > HOME

English Italiano


Rock Mite

CW transceiver kit


Rock Mite


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.





- 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


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 itís simply to do and it gives satisfaction.


Rock Mite Rock Mite


Frequently asked question....

How to use the Rock Mite with a vertical key ?

The right way to setup the Rock Mite for the vertical key use is as follows :

  • Switch off the Rock Mite power
  • Plug in the vertical key's  jack
  • Keep the vertical key down (closed contact) and turn on the Rock Mite.

Have fun  with your Rock Mite!


More links: