QRP Transceiver Projects. Jim Spikes, N4KH
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1 QRP Transceiver Projects Jim Spikes, N4KH 21 April 2012
2 Evolution of 40 Meter CW Transceiver R1 high performance direct conversion receiver Rockmite 40 performance left something to be desired Goal: Build a real homebrew transceiver for 40 CW, consisting of: R1 DC receiver and a proven VFO circuit 3 stage MKII 5W+ transmitter Universal VFO Suitable for R1 and its successor, the Mini-R2 Norcal Keyer Upgrade to Mini-R2 receiver
3 Good performance Very low distortion audio amp Built with 3Khz filter No provision for removing audio image/opposite sideband No AGC Receiver (R1) High-Performance Direct-Conversion Receivers by Rick Campbell, KK7B, QST, August 1992
4 Rockmite 40 Meter Transceiver Crystal controlled DC Receiver 8-pin PIC microcontroller, built in keyer Pushbutton reverses offset to yield a second oper. frequency. Introduced in 2002 by K1SWL
5 Some Desired Features 40 meter CW band 5+ watts output Smooth T/R switching/semi break-in keying Built-in keyer Receiver incremental tuning (RIT) Good performance (not too worried about parts count or DC power consumption) Enough audio output for small speaker Portable
6 MKII Transmitter 3 stage design, up to ~7.5 watts output if desired (or a bit more?), depending on supply voltage and drive setting Automatic T/R switching for use with a receiver Side tone oscillator Spot circuit 2N3904 crystal oscillator/vxo, inexpensive 2SC5739* driver and power amp Common parts for T/R switching and side-tone oscillator See Wes website for notes on MKII transmitter An Updated Universal QRP Transmitter by Wes Hayward, W7ZOI, QST, April 2006 *Obsolete, check with Bill Kelsey, N8ET at
7 Transmitter An Updated Universal QRP Transmitter by Wes Hayward, W7ZOI, QST, April 2006
8 Ugly Construction Ugly Construction involves building circuits on top of a double or single-sided copper clad board The copper ground-plane provides a low impedance ground and mechanically supports the parts Stand-offs: high value resistors (10 Megohm or greater), terminal strips/posts, or small copper islands glued onto the copper.
9 Variable Frequency Oscillator (VFO) Universal VFO (UVFO) design (KK7B) ~60Khz tuning range (bottom end of 40M) I and Q outputs for a receiver Single output provided to drive a transmitter. RIT built in. Variable capacitor with reduction drive
10 Variable Frequency Oscillator (VFO)
11 Norcal Memory Keyer PIC12F6293 microcontroller (pre-programmed) Three 40-character memories Iambic, straight key and bug mode; beacon modes Variable speed control via paddles (option for potentiometer control if desired). 7-to-18 volt input power range with 5V regulator built in Side-tone from keyer is injected into the audio circuit FB sent by the keyer at power up through the sidetone if functioning correctly. (now retired)
12 5V Reg. Keyer Chip Output Transistor (to key rig)
13 Keys Used PAR (press and release) PAH (press and hold) Mem switch Send memory 3 Record memory 3, O? Beacons: BE and BA Mem + dit Send speed Paddle set of speed, pot options, main menu Mem + dah Send memory 2 Record memory 2: M? Mem + both Send memory 1 Record memory 1: T? CW Menu Item Pressing a dit Pressing a dah Memory + Dit Menu (PAR mem to advance to the next menu) S Speed set from paddle Increase speed 1 wpm Decrease speed 1 wpm P Pot / paddle speed control Selects pot speed control Selects paddle speed control C Calibrate pot speed control Enters the calibration routine Restores default pot calibration B Bug / straight key mode Enables bug mode (dah = key) Disables bug mode (default) A Iambic mode A or B Enables iambic mode A Enables mode B (default) R Reverse paddle mode Reverse dit and dah switches Returns dit and dah to normal AU Autospace on / off Turns on character autospace Turns off autospace (default) Memory + Dah Menu (PAR mem to exit) M? Record memory 2 Records a dit Records a dah Memory Switch Menu (PAR mem to advance to next menu) O? Record memory 3 Records a dit Records a dah BE Beacon mode - sends mem 1 Starts the beacon going Exits the menu BA Beacon alternate mode Selects alternate beacon sends of mem 1 and mem 2 Selects send of mem 1 only (default) ST Side tone on/off Turns off the side tone Turns the side tone on Memory + Both Menu (PAR mem to exit) T? Record memory 1 Records a dit Records a dah
14 Transceiver Enclosure
15 SONAR FR-104 VHF Monitor
16 Enclosure Re-Purposed SONAR Case Unwanted holes filled with J. B. Weld Front Panel Overlay
17 Construction
18 Transmitter Internal Layout Keyer VFO R1 Receiver
19 Front Panel
20 Receiver Mini-R2 DC Phasing Receiver (single signal) Based on R1, successor to original R2 Audio sufficient for headphones or small speaker Slightly better performance than R2 and R1 A Small High Performance CW Transceiver by Rick Campbell, QST, November 1995
21 On The Air Contacts V31WA Belize SC8N Sweden CS95A Madeira Is. P40ADI Aruba OK5W Czech Rep. OM2VL Slovak Rep. HB9LCW Switzerland Numerous states (incl. FL, CA, WA, CA )
22 Possible Improvements Adjustable T-R delay Selectable bandwidth audio filter (Wide/Narrow) Switch for second tuning range Internal speaker Louder spot signal 30, 20 or 15 Meter version??
23 Build Something! Not as difficult as you think! Many excellent published designs (QST, CQ, ARRL Handbook, Web) Bag kits avoid gathering of parts Larger projects (e.g. receiver, transceiver) can usually be broken down into modules Learn by doing Loads of fun to put it to work in your station
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