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Description

ADX-S Digital Modes (WSPR, JS8, FT4 and FT8) HF QRP Transceiver Kit with 40, 20, 15 and 10 meter LPF Band Modules

Unit Price: 69 USD including tracked air shipping. Accepting orders now and shipping in a week.

Photo: BG7IKK who built the ADX-S kit and achieved over 18,000 km DX with his EFHW antenna. Click the photo to enlarge.

The ADX-S Digital Modes HF QRP Transceiver is the Superhet modification of Barb, WB2CBA's open source Arduino Digital Xcvr inspired by the receiver design idea of JA9TTT. The receiver performance is much improved compared with the original direct conversion design at the cost of adding only two components. Several hardware and firmware bugs are fixed so you can build with better experience, thanks to the feedback from dozens of the beta testers and early domestic customers. The code is open source so you can customize the radio with your own idea. It works with WSJT-x, JTDX on PC or FT8CN on Android phones in VOX mode.

Kit Assembly Manual, 41-pages with many photos

Review by Peter Parker, VK3YE

QRPer.com: FROM IDEA TO KIT: ADAM INTRODUCES THE ARDUINO DIGITAL MODES HF QRP TRANSCEIVER (ADX-S) KIT

Track BD6CR QRPP WSPR signal at 20m

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CRK-10A CW Transceiver Kit

Unit Price: 49 USD including tracked air shipping.

Frequency

 

The classic crystal controlled CW transceiver with great performance is back!

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CRK-10A eHam product review average rating 5.0/5.0

 

CS-xxV SSB Transceiver Kit

Unit Price: 85 USD (mic is not included) including tracked air shipping. You can choose from CS-40V and CS-15V. You can use your ICOM HM-36 hand microphone for this kit. [Starting from 2023, you will get MC1350 again in the kit as free upgrade.]

Coverage

 

 

We introduced the KN-Q7A SSB transceiver kit in October 2011, and it was a big success. Now, we bring it back with a few modifications. We also newly added 15-meter called CS-15V. Here, V in CS-xxV is for VXO. There is no DDS, MCU, or anything else digital. All analog, all traditional.

The IF crystal filter is improved with a better impedance matching.

The MC1350 replacement is a tiny module of a dual gate FET.  The gain is lower, the gain control is counterclockwise [of course, you can modify it back], but it is loud enough for the speaker microphone if you are using a full sized antenna.

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[The previous generation KN-Q7A was widely introduced by CQ Amateur Radio magazine in US, CQ Ham Radio magazine in Japan, RadCom magazine in UK, Amateur Radio magazine in Australia, and some other brief introductions in other countries since 2012.

KN-Q7A eHam product review average rating 4.8/5.0

KN-Q7A manual for PCB V2.2, including schematics and partlist for 80/75/40/20m ]

 

13 Transistor Transceiver for Digital - 7074 USB

Unit Price: 59 USD including tracked air shipping. All the parts and case are included.

 

Can you build a 1-watt FT8 SSB transceiver by only 13x 2N4401 transistors? This thread contains all the information about this traditional kit of all through-hole parts.

https://groups.io/g/crkits/topic/85889614#3649

Dimensions: 103mm depth x 88mm wide x 38mm height
Weight: about 235 grams w/o internal batteries
Frequency and Mode: 7074kHz USB
Filter: 4x 7078kHz crystals covering around 7075.5-7077kHz
Audio Pass Band: around 1500~3000Hz
PTT Control: VOX
Receive Current: around 50mA
Transmit Current: around 300~350mA
Transmit RF Power: around 1-Watt
Spurious suppression: -53dBc

Schematic: Inspired by VK3YE Knobless Wonder and K1SWL Warbler with improvements

New Review by Peter Parker, VK3YE https://www.youtube.com/watch?v=pAJE7IKOuPw

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R3500D ARDF Receiver Kit

Unit Price: 39 USD including tracked air shipping. Earbuds are not included.

 

R3500D is the upgraded version of the well known PJ-80 80m direction finding direct conversion receiver kit. 3500~3600 kHz coverage. Color is random.

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Note that the LO frequency is at half of the working frequency. It is by design, no worries.

Step by step building video

PJ-80 eHam product review average rating 5.0/5.0

 

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