CS-series SSB Transceiver Kit with Speaker Microphone Combo

Unit Price: 120 USD. Shipping and Handling: 10 USD. If you don't need speaker mic, email us and you will get refund of 23 USD.

Choose One Band


The CS-series supercedes the KN-Q7A. It inherits 6-pole crystal filter, MC1350 IF amplifier and rigid metal case. Also, it integrates Sandwich digital VFO to have wider frequency coverage and better frequency stability. A few more enhancements are also added. Speaker microphone is added to the standard configuration. Besides SOTA, consider HF digital like JT65 or FT8?

Detailed Manual with Photos  Download product photos

Arduino Sketch for CS-17/15, CS-20 (updated), CS-40

[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 ]


NP0/C0G Monolithic Capacitor Assortment

Unit Price: 35 USD for 25 each or 68 USD for 50 each. Shipping and Handling: 5 USD.



These monolithic capacitors are high quality parts manufactured by Torch. They are all NP0/C0G parts, 100V, 5%, and 5.08mm lead spacing. The assortment offering contains 25 or 50 each of these values commonly used in QRP projects (total 525 pcs or 1050 pcs):

5.1p, 10p, 15p, 18p, 22p, 27p, 33p, 39p, 47p, 68p, 82p, 100p, 120p, 150p, 220p, 270p, 330p, 390p, 470p, 560p, 820p

DIY Series IF Transformers

Unit Price: 1.5 USD. Shipping and Handling: 5 USD.

These customized DIY Series IF Transformers are high quality parts used in KN-Q7A and CS-series kits.


2 Choc Perf Boards for RF Experiments Plus 1 Metal Case Combo

Unit Price: 15 USD. Shipping and Handling: 7 USD.

If you just need the Choc Perf Boards, unit price is 2.5 USD and shipping is 5 USD each time at a small quantity order, email us to make price adjustment.


The Choc RF Perfboard is designed by BD6CR to facilitate RF experiments and prototyping. The pad pattern will provide great convenience to fit in discrete parts as well as IC and even 7x7 IF transformers, and good RF performance with modular design with grounding and shielding can holes around each unit. It is easy to break into small units. The 3 x 4 unit board fits the metal case of KN-Q7A very well. The video takes BITX-40 and VK3YE Knobless Wonder as examples to show how easy it is to use the Choc Perf Boards.

Build a SSB transceiver with Choc Perf Board


Sandwich Digital VFO Complete Kit

Unit Price: 19.9 USD. Shipping and Handling: 5 USD. If you don't need the Arduino board, unit price is 9.9 USD, and please email us to make adjustment.

IF Frequency Options


This simple yet useful si5351a and Arduino based digital VFO is a great addition to KN-Q7A and other single conversion SSB radio. The innovative one LED frequency display is amazingly easy to count and read the operating frequency. SMD part is pre-mounted. The assembled kit is as shown on the left.

Detailed manual with photos, Arduino Sketch for KN-Q7A 80m, 40m, and 20m band

Detailed manual in Spanish by Jon, EA2SN

Sandwich Digital VFO FTDI Serial Programmer

Unit Price: 9.9 USD. Shipping and Handling: Free.



This genuine FT232 based serial programmer can be used to upgrade the firmware yourself if you want to make some modifications. You will need to download Arduino IDE, setup board as "Arduino Pro or Pro Mini" and processor as "ATmega328 3.3V/8MHz", choose correct serial port (if necessary, install driver first for this serial programmer), make changes to the sketch and click Upload button.

Wiring to Sandwich digital VFO

Download Arduino Sketch for KN-Q7A 80m, 40m, and 20m band

R3500D ARDF Receiver Kit

Unit Price: 30 USD. Shipping and Handling: 6 USD.

R3500D ARDF Receiver (Assembled)

Unit Price: 39 USD. Shipping and Handling: 6 USD.


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.

R3500D English manual including part list, modification instruction to 40-meter band and photo of the PCB assembly

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

CRK-10A CW Transceiver Kit

Unit Price: 44 USD. Shipping and Handling: 5 USD.

Frequency Options


A credit card size 40m or 30m CW transceiver kit designed by BD4RG. 3 watts output for 40m band or 2 watts output for 30m band. Same built-in keyer as HB-1A or HB-1B. Multiple frequency options. The assembled kit is shown on the left.

eHam product review average rating 5.0/5.0

manual including part list


Documents Archive

How to Order


Contact Us

说明: 说明:

All rights reserved.