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*** U N D E R     C O N S T R U C T I O N ***

5Watter QRP VCXO Organic Transceiver
scheduled for early July 2019


This document describes the building of the
20 Meter 5Watter Organic Transceiver Kit

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See who is QRV on the QRV webpage

Last Updated Tue, 11 Jun 2019 07:52:03 -0400
Always check the Addendum Section for updates

Build this 5Watter QRP VCXO Tranceiver for $49.00

The 5Watter is a high quality inexpensive transceiver designed for the QRP enthusiast
Guaranteed 5 Watts output using 12 VDC
Designed for home and portable operation.
Small Size PCB, only 3.5 inches (89 mm) square.
Full QSK, dual conversion design with great selectivity
Very low noise measured at -137 dBm MDS
The 20m VCXO covers from below 14.000 MHz up to about 14.066 MHz
Includes multifunction keyer chip with "natural" sidetone


Full Size Schematic


Building Instructions:


1. Be careful when you inventory the parts; they are small and easy to lose.
    There are four (4) plasic bags that hold all the parts for the 5Watter Kit.
    Keep all parts in their respective bags; do not mix them up.
    There are black toroids in the bags that look identical but are NOT.
    There are also Red Diodes that look identical but are NOT.

Parts List and Inventory Sheet for 20 Meters Kit

    If you are missing any parts, contact me immediately.  I will ship the parts the same day.
    If you find extra parts in the kit, check the Addendum else throw them in your junk box.

    This kit includes all parts to create a fully functioning transceiver.
    Included parts are: 2 phone jacks, a bnc jack, a push-button, Tune & volume & gain control pots, magnet wire and heat sinks.
    This kit uses five (5) all black ferrite toroids. Two (2) FT37-43 and three (3) FT37-61 toroids.
    The two (2) FT37-43's are included in the bag with the green 100n capacitors.
    Mark the bag with the green caps as "-43" and the bag with the resistors as "-61"
    This will help with identification later on when installing inductors and transformers.
    Install the parts in the order per this document to prevent mechanical installation problems later.

    Each 5Watter is provided with a Serial Number, which is attached to the bag holding the PCB and magnet wire
    Attach the label to the rear of your 5Watter enclosure or wherever suitable
    The Serial Number may later be used for tracking 5Watter QSO contests.

    This kit requires the following items to complete the kit:
    No. 22 or 24 gauge hook-up wire to connect the PCB to the controls and enclosure.
    Rosin Solder 60/40 (OK) or 63/37 (Best) and a fine tip solder pencil.
    Tool for adjusting trimmer capacitors - suggest search for GC-8608
    optional freq counter - search ebay for PLJ-0802
        Manual for the Frequency Counter
    optional keyer speed adjust potentiometer - recommend 10K linear.
    optional power on/off switch.
    optional case - Suggested 5Watter Cases

17. The Keyer v.4 Instructions

   This is a very basic Iambic-Mode-B Keyer using an ATmel AVR Microprocessor
   On power-Up, the keyer defaults to 15 WPM and a sidetone of 625 Hz and annunciates "5W" [ ..... .-- ] via Int'L Morse Code.
   Connecting a straight key with a Mono Plug automatically places the keyer into straight key mode.
   Moving the "Speed Pot" changes the speed from 5 WPM up to 36 WPM (version 3 and higher only)

   The internal timing oscillator in the Keyer Chip is an RC oscillator that runs at 9.6 MHz +/- 10 pct Factory Calibration.
   Typical accuracy is +/- 5 percent; The accuracy can be impoved to +/- 2 percent if one takes the time to calibrate
   the oscillator and reprogram the keyer chip. This procedure is too time consuming for 200 chips but may be OK for you.
   The accuracy is typically +/- 5 pct so your sidetone may be off by +/- 5 pct and your keying WPM may also be off.
   That means if you set the WPM speed to 20 WPM, you may actually have it set at 19 or 21 WPM; should not be a problem.

   The keyer is placed into the "Command" mode by pressing and releasing the Cmd Button.
   The keyer has the following commands available after pressing the Cmd Button:

"A" (.-) Toggles transmit sidetone audio
   The sidetone mode setting is saved on power-down.
   If transmit sidetone flag was set, then clear flag and announce "Y"; Y=yes, we turn on transmit sidetone audio
   If transmit sidetone flag was clear, then set flag and announce "N"; N=no, we turn off transmit sidetone audio
   CMD Sidetone Audio is always active when a CMD is issued.
   Enable this Mode when using the "natural" transmit sidetone.

"B" (-...) Enter Beacon Mode
   Hit CMD button and enter "B" to start Beacon Mode
   Listen for a DIT to acknowledge ready to select message number
   Enter message number...1, 2 or 3
   Message repeats over and over
   Hit paddles, dit or dah or straight key to turn off beacon mode

"E" (.) or "T" (-) Toggles between normal keyer and straight key mode, acknowleged by annunciating
   "S" (for Straight Key Mode) in code. The keyer mode is NOT saved on power-down.
   Connecting a straight key with a Mono Plug automatically places the keyer into straight key mode.

"M" (--) Enter Beacon Message(s)
   Hit CMD button and enter "M" to enter message
   Listen for a DIT to acknowledge ready to select message number
   Enter message number...1, 2 or 3
   Listen for a DIT to acknowledge ready to enter a character
   Enter one character at a time, then wait for another "dit"
   To enter a word space, do not enter anything in between annunciated "dits"
   At the end of the message, do not forget to add empty character time.
   This allows you to pause and listen between CQ calls. Recommend 25 or more word spaces.
   Terminate message entry mode by send "AR" or ".-.-."

"R" (.-.) Toggles between normal and reverse paddles keys, acknowleged by annunciating "P" (for normal paddles)
    or "X" (for reversed paddles) in code. The paddles (normal or reverse) are saved on power-down.

"S" (...) Set keyer speed in WPM. Speed is entered as two numerical digits.
   After sending the "S" command, the keyer sends a DIT (e) as a prompt for the first speed character (0-4)
   After sending the first speed number, wait for another DIT (e) prompt and send the 2nd number (0-9)
   Depending upon what you enter, you will hear a "?" for ERROR or an "R" for a "Roger" acknowlegement.
   Valid keyer speeds are 1 to 45 WPM (good luck trying to send/use 1 WPM)
   The keyer speed setting is saved on power-down.

"F" (..-.) Sets the sidetone frequency.
   After sending the "F" command, the keyer sends a DIT (e) as a prompt for the tone character (0-9)
   Depending upon what you enter, you will hear a "?" for ERROR or an "R" for a "Roger" acknowlegement.
   The sidetone frequency setting is saved on power-down.

   The following table equates the sidetone number with the sidetone frequency:

   0 = 1000 Hz
   1 = 833 Hz
   2 = 714 Hz
   3 = 625 Hz
   4 = 555 Hz
   5 = 500 Hz
   6 = 455 Hz
   7 = 417 Hz
   8 = 385 Hz
   9 = 357 hz

"V" (...-) Announces the keyer version number

"X" (-..-) Puts the keyer into transmit or tune mode
   Hit paddles dit or dah or straight key to turn off tune mode

Disable the keyer sidetone for the "natural" transmit sidetone.

The keyer has Deadman Insurance. In the event that the keyer issues 64 successive DITs or
64 successive DAHs, the keyer will shut down and cease to operate.
You must power down the keyer chip to restart normal operation.

To Reset the Keyer to the Default mode, hold the Cmd button active until you hear "1W"
Then immediately release the Command Button, else you will send another Command request.

Source code and hex files for the keyer are available at


Variable capacitor settings:

Maximum CapacitanceMidway CapacitanceMinimum Capacitance

If you need an alignment tool for the trimmers, look up "GC 8608" - available at and

We recommend the purchase of the optional Universal Interconnect Kit #2. The kit includes
   30 female pins, 40 male pins and 10 3-pin (1x3) header housings.
   A crimping tool is available from for creating cables.
   Search Ebay for SN-28B Pin Crimping Tool
   or visit
   A How-To video

Addendum Section:

July 1 2016 2359 - nothing yet

End of Addendum Section:   top