StayAtHome QRP
Transceiver

Single-Band CW
Minimal design

video

On The Air

Between November 2020 and February 2021, I reached 85 DXCC. For DX I used a 2xIRF510 power amplifier with 30 Watts output.
First time I had a simple dipole but I felt that need a better dx antenna.
This vertically polarized 40m loop is a really amazing antenna for Rx and Tx also.

First DXCC QSO
TNX FOR CONTACT 73 & DX!

Date Callsign
2020-11-05 18:34
EA6NB
2020-11-06 17:26 T6AA
2020-11-13 15:04 4X0ARF
2020-11-17 19:14 4O4T
2020-11-18 19:04 RV30DX
2020-11-19 17:02 A450XR
2020-11-19 20:00 TA7I
2020-11-22 18:05 SV9MBH
2020-11-24 15:58 MX0SNB
2020-11-28 05:45 MM9I
2020-11-28 05:48 OH0Z
2020-11-28 06:10 EA8RM
2020-11-28 06:12 OZ5E
2020-11-28 06:14 UX5N
2020-11-28 06:19 WP3C
2020-11-28 06:40 E73AA
2020-11-28 06:45 MU2K
2020-11-28 06:49 EA7A
2020-11-28 07:39 LX8M
2020-11-28 07:40 SJ0X
2020-11-28 07:41 YL7X
2020-11-28 07:42 DK5XG
2020-11-28 07:43 S53F
2020-11-28 07:44 HB9CA
2020-11-28 07:47 ON4CT
2020-11-28 11:25 OH2XX
2020-11-28 12:24 YT5A
2020-11-28 12:26 SN3A
2020-11-28 12:34 UN9L
2020-11-28 12:38 HG8K
2020-11-28 12:41 IT9EJV
2020-11-28 12:44 OK1CZ
2020-11-28 12:51 LZ9W
2020-11-28 12:59 LA2AB
2020-11-28 13:06 RM9A
2020-11-28 13:17 TF3SG
2020-11-28 13:35 EU8U
2020-11-28 13:39 YO6FGZ
2020-11-28 13:40 OM5WW
2020-11-28 13:41 9A5X
2020-11-28 13:43 PA5DX
2020-11-28 13:48 LY2ZO
2020-11-28 13:57 F6IIT
2020-11-28 14:04 Z32TO
2020-11-28 14:27 A60A
2020-11-28 15:22 J42I
2020-11-28 19:25 SV5DKL
2020-11-28 19:47 C4W
2020-11-28 19:49 CR3W
2020-11-28 20:00 9H1PI
2020-11-28 20:02 CR5O
2020-11-28 20:13 JR4OZR
2020-11-28 20:27 IS0HQJ
2020-11-28 20:47 EI7M
2020-11-28 20:51 VE3JM
2020-11-28 21:24 K1TTT
2020-11-29 05:01 FM5BH
2020-11-29 05:07 KP2M
2020-11-29 05:17 ZF1A
2020-11-29 05:30 TI7W
2020-11-29 05:56 P40W
2020-11-29 13:18 RG2A
2020-11-29 14:11 ES1BH
2020-11-29 15:36 B7C
2020-12-01 18:07 7X3YOTA
2020-12-06 21:02 JT1CO
2020-12-08 07:41 OE25XKJ
2020-12-17 19:37 9K2HS
2020-12-20 19:02 4L5P
2020-12-24 16:05 JD1BMH
2021-01-02 13:36 MW2I
2021-01-02 14:10 ZA1F
2021-01-04 19:40 4J0SFR
2021-01-06 19:38 VK2GR
2021-01-13 20:07 DS3EXX
2021-01-15 19:20 JX2US
2021-01-29 06:53 CN8KD
2021-01-31 15:16 TK5MH
2021-02-02 16:07 T77C
2021-02-02 18:36 MI0VKO
2021-02-06 19:13 GJ0KYZ
2021-02-06 21:03 PY1VOY
2021-02-18 17:44 GD0OUD
2021-02-24 20:57 HZ1SK

Highlights

Experimental transceiver with MAX4218 video op-amps

During the first lockdown in 2020 I decided to build a small trx to 40m and try to complete 100 DXCC in the winter season.
It almost succeeded:)

KEY SPECIFICATION

Frequency

7000..7200 KHz

Output Power

4W

Input supply Voltage

10..15V

Filter

4.915 MHz

200..1600Hz

Functions

Iambic keyer

bandscope

Schematic

My goal was to develop a minimal single band CW transceiver with as few parts or modules as possible.
Download schematic

Source code

Arduino source code & fonts
DOWNLOAD

LIBRARIES
PDQ GFX TFT
SI5351 N7TS
Encoder
Timerone
DOWNLOAD

Construction

This radio has two double shielded pcb. I tried to separate the digital and analogue components. All noise sensitive wires are thin shielded AF cable.

PCB is made with cnc milling machine.

I used 
Autodesk fusion 360
for the design. Thanks for supporting personal use for hobbyists.

STL files
DOWNLOAD