The following files have been uploaded to the Files area of the crkits@groups.io group. /CS-xxV Documents/Pitfalls of Building CSxxV.pdf By: Adam Rong Description: Here I list the pitfalls of building

Adam has discontinued selling the original Sandwich. I have found that there is still a small demand for the product. I am now introducing the "Sandwich 2". It is still a Digital VFO but is now on a s

The following files have been updated in the Files area of the crkits@groups.io group. //SDR-40a Documents/SDR-40a user manual.pdf By: Adam Rong Description: In case someone is interested in this tiny

The following files have been uploaded to the Files area of the crkits@groups.io group. /SDR-40a Documents/SDR-40a user manual.pdf By: Adam Rong Description: In case someone is interested in this tiny

Hello, This email message is a notification to let you know that the following files have been uploaded to the Files area of the crkits@groups.io group. /R3500D Documents/R3500DYOTAAssemblyManualPurdu

The following files have been uploaded to the Files area of the crkits@groups.io group. /KN990A Documents/KN990A HF All Mode Transceiver Operating Manual.pdf By: Adam Rong Description: New KN990A oper

All, It is a 40-m Knobless Wonder I made a few months ago. About 2 months ago, I successfully made first two QSO's thanks to the NVIS propogation, as they are both 150km away. Tonight I heard a very s

I just finished building my D4D for 20 Meters. When I power it up, it immediately starts switching between transmit and receive (I can hear the relay clicking). I started a search here and stumbled ac

Hello HT-1A users. I don’t see a single thread showing the battery board with amp installed. Anyone have some photos? If so, please post. I want to build the amp and install the board but I don’t know

hello Adam and the group. My nifty little HT-1 arrived today, about a week after I ordered it. scanned through 20 meters and worked N7WR-- 1019 miles away. RX is better than I expected. overall the ra

All, Finally I took time to shoot a few photos to show the building process of the mini wire antenna in EFHW form. The price is 10 USD each kit and freight can be as low as 5 USD for regular air shipp

All, My stock of HT-1A is sold out. If you still have interest, you can consider my Japan distributor. After a period of free upgrade to FedEx, EMS shipping is almost back to normal now. I will resume

The subject of Linear amps came up recently. Many of the kits on the internet , generally from PRC are rubbish. They use overdriven switching Mosfets and the ferrites are unknown and there is no LPF o

Folks, I tested the spurious products of KN-990 with my spectrum analyzer and this is the test report. Overall it is a good radio. https://mp.weixin.qq.com/s/RYjlLbZbzXExG6h0PODfOQ Thanks, Adam

Hi, I misplaced the golden toroid wire and have no idea what wire I now have to buy to replace it. Can you please help me with this? 73 Michael

this is to do with reworking an existing known good PP RF amp to work at a higher frequency. I am looking for a competent PCB draftsman who can use Protel or his own software or at least some directio

Can anyone recommend a Linear HF Power Amplifier that works with the D4D DSB Transceiver Kit. I see a few kits on ebay but not sure what will work with 1w input

Folks, Besides WSJT-x or JTDX, you can consider HDSDR or other SDR software. You can receive a mirrored spectrum but you still can decode something. Just plug into the Mic in jack and set LO to 7.074

All, Please check out Nakajima-san's pages regarding HT-1A and CS-xxV. He has maintained rich information, great detail and history. Thanks! HT-1A http://jl1kra.sakura.ne.jp/ht1a.html CS-xxV http://jl

Folks, You just burn the image and you get many popular amateur radio applications pre-installed in your Pi. https://mp.weixin.qq.com/s/OFVRczi7igv-RDLpfe9MTw RadioPi 20200801 Pre-installs: WSJT-X，2.2