This is the effort of several retired guys, John Fisher K5JHF, Milt Cram W8NUE, Ben Bibb N05K, and I, (and other AQRP members) to make some useful kits available for you at reasonable prices to encourage kit building and homebrewing. As you can quickly determine, these kits are all based around readily available, low cost Microcontrollers with flash (program) memory and most use a certain LCD display that was very, very, inexpensive. The criteria for us, as "low buck" designers, was that firmware development tools have to be free, hardware interface tools have to be inexpensive, and PC board design tools have to be free.

As we run out of parts we'll just order more if there is interest in the kit. Some kits may be retired as the number of kits grow or demand falls off. Should be fun and educational and that's what this is all about. I'll make improvements to the web site as time allows and hope to make it convenient to use. We are all ready to answer your questions and help out.

I just got back from the post office and the rates went up again Jan 17th, 2016, especially for DX, so I had to adjust the postage charged.

I realize there are some Hams out there who think they will have difficulty with the small surface mount parts placement and soldering and "think" they can't do it. I highly encourage you to try. If you "ping" a small part across the room and it's lost forever, contact me and I'll send you another at no cost. Some may have vision problems, steadiness problems, etc, again I encourage you to try.

To order kits please contact me directly at K5BCQ followed by an @ sign followed by ARRL.net with no spaces. Or via mail (OK in QRZ).

There have been some problems with the email forwarding through the ARRL Website so let me try this as an alternative; hopefully to also cut down on the robospam. You can also contact me through windy10605 followed by an @ sign followed by Juno.com with no spaces. Let me also do the same for the other email IDs.

This is Inspector #5 who is my computer consultant. She checks to make sure I answer all emails in a timely fashion. In her efforts to educate me she periodically walks across the keyboard, usually puting the system in "Caps Lock" or causing "strange happenings". As a tough teacher, she refuses to tell me what she did and wants me to find out for myself.

The Hi/Lo Temperature Kit #1


An assembled Hi/Lo Temperature Kit #1.

Closeup of the small microcontroller board with the temperature sensor (8 pin SOIC). The microcontroller is on the back of the board.

This is one of the easier to build kits. It simultaneously shows the Low, Actual, and High Temperature readings in degrees F or degrees C (so it's educational too). You reset it by momentarily turning the power OFF and back ON. There are two versions of the code which you need to specify when ordering ....."T" (Toggle) which will automatically toggle between degrees F and degrees C every 5 seconds ("T" is the default if you do not specify "T" or "F") and "F" (Fixed) which will read degrees F without the jumper "J1" installed and degrees C with the jumper "J1" instsalled. The battery consists of 2-AA Alkaline cells and should last about one year. Use Alkaline cells because of the 1.5V rating. Rechargeable NiCad cells at 1.2V are really too low for proper LCD contrast. The temperature sensor is a MicroChip MCP9801 which is spec'ed at +/-1 degree C from -10C to +85C and +/-3 degrees C from -55C to +125C.

So what comes in today's Hi/Lo Temperature kit ? .....Bill of Material:

The price for of this Kit is $10 plus $4 postage in the USA and $13.25 postage for DX.

This is Inspector #2 who is in charge of parts counting for all the kits. It's a very tiring job and sometimes the parts count is off. Just send me a note if you find any parts missing. I'll have a discussion with him.

The Si Controller and Frequency Generator Kit #2

THIS KIT WILL BE BACK AS THE "Si CONTROLLER" supporting BOTH Si5351 and Si570 chips, has a small OLED Display, and much added function like scanning. It uses a LPC824 Microcontroller. WATCH THIS SPACE

This standalone unit (no attached PC required) has a frequency range of 8KHz to 1417.5Mhz (yes, 1.4GHz) depending on the Si570 part used. I have tested it up to 1200Mhz which is as high as my scope will go. Really an amazing, low jitter, and very low spur levels chip. You can go to the SiLabs website and look at the specifications. All setup and control is via the rotary encoders and it's push button. Power is battery (3V) or external power (5V-12V).


The price for of this Kit TBD...... plus $4 postage in the USA and $13.85 postage for DX.


Mini Circuits TC1-1TG2+ RF Transformer is $2 plus $2 postage in the USA and $2 postage for DX. No postage if ordered with a kit. You only need this part if you want complete DC isolation.

FIN-1002 LVDS to LVTTL Converter $1 plus $1 postage in the USA and $2 postage for DX. No postage if ordered with a kit. You only need this part if you are using a LVDS Si570 and you want to have an LVTTL single ended output vs the differential LVDS output.

The Morse Code Trainer MCT-I, MCT-II, and MCT-III Kits #4

These kits are in stock

"I'm Samuel Morse and I approve all these kits"

Example of a MCT-II in a Hammond RL6215 enclosure, showing qty 13 of the 7mm tactile switches with overlay "domed" over the pushbuttons.

Inside of above MCT-II in a Hammond RL6215 enclosure.

This is the smaller MCT-I with qty 5 tactile switches for memory selection. (no enclosure)

MCT-I showing the 5 "Parameter Selection" switches on the side (UP, DN, Home, Plus, Minus).

Example of a MCT-III in a SERPAC A31 enclosure, showing qty 13 of the 13mm tactile switches with overlay "domed" over the pushbuttons.

Inside of above MCT-III in a SERPAC A31 enclosure.

No more excuses for not learning Morse code and not enjoying the mode that gives you the most DX and satisfaction in operating!

It’s finally here, a box that anyone can build that does it all for CW, and an opportunity to jump into building a kit that’s simple for the beginner to learn about Surface Mount Technology (SMT). When finished it will be something to be proud of that’s functional, and a tool to use every day which will enhance everyone’s CW operating skills forever!


AQRP Morse Code Trainer Manual Rev A00


AQRP MCT-I Schematic

AQRP MCT-II Schematic

AQRP MCT-III Schematic

Hammond Enclosure RL6215 Template for MCT-II

SERPAC A31 Enclosure Template for MCT-III

The secrets of easy Morse Code Sending


All the units use the same LPC824 microcontroller, the same firmware, and the same OLED display. Since PTT output for CW with it's lead and tail times are not required for today's Transceivers, the firmware to support PTT is NOT provided.