The SA602 only requires a 50 mV p-p signal to fully unbalance it. Larger signals create all kinds of unwanted mixer products. Since the VOX requires a 1200 mV p-p signal to trigger it, there needs to

Folks, Recently I received a few inquiries about club projects. I have two kits for your consideration, both at reasonable price under 40 USD. R3500D ARDF receiver kit Although I am not offering kit a

Folks, What a Chinese new year holiday! We stayed at home for 2 weeks and now the shipping forwarder resumes shipping. Thanks, Adam

Here are some pictures of my mini FT8 station I built for Field Day. It is built around a Sunfounder 7" hi-res screen and Raspberry Pi 3B. It uses a wireless keyboard/mouse combo, $15 GPS module and $

Folks, Happy new year! 2020 is the 9th year of CRKits.COM and I am glad I am still active with this side business, although I travel 95% for my professional work. In 2020, my US distributor Larry will

I am in need of the schematic and parts list for the D4D . I can only find the 30 pages manual but without the part values it can not been built. Can anyone pass along how to find what needed? Thanks

Hi Has anyone experimented with replacing the BD139 output transistor with a 2SC1969 or other transistor to increase the power output? It seems technically possible... Thanks Nicholas 2E0GKG

Folks, Designed by BG1REN and kitted by BD4KG, the new enhanced pixie board kit features keyer, side tone and TX/RX frequency offset. 40m and 20m versions are now available. https://mp.weixin.qq.com/s

In D4D Kit Assembly Manual, Rev.D, pages 21-22, there is text: "In setting windows Radio tab, choose Rig to none and PTT to VOX". What is the application where this configuration is to be performed, a

I was wondering if any of the HT-1 user had added the RF control while leaving the AF control connected. If so where on the back panel did you drill the hole for the control. Thank you. John K2JHU...

Thanks for all your support. Happy thanksgiving to USA and the rest of the world. Thanks, Adam, BD6CR CRKITS.COM

Hi I have completed my DSB 40m build but cannot get any audio out of it have tried connection to usb sound card, pc, external Speaker and headphones Vox triggers tx but I dont see any signal being sen

Hi there... Had my first FT8 contact tonight using my just completed D4D DSB. This was also the first two way contact using the magloop prototype you see in the pic. Thanks for the kit! 73 de AE6UJ

Hello All, I have a 20M D4D, and I think I may have a problem with it. I have been a bit mystified that I have so far only had 1 contact on this thing even though I've been on the air with in for many

Hi all. Hoping someone can advise me what causes the pulling of the 14.070.0 crystal to 14.074.0 In step 3 of the manual it states by adding a wire to the antenna termanual of your transceiver and pla

Folks, K7QO closed his qrp-tech group a few days ago. I am sorry to know that. Is QRP Tech obsolete? Thanks, Adam

I have sent 2 e-mails to the USA site asking if they have any assembled radios with no response. I would really like one of these radios and thought shipping from US location would result in a faster

Folks, It will be great time to try 80m. Remember, we have the 80m version of D4D. Thanks, Adam

Hi All. I'm curious if there's a point in the D4D circuit that would allow for an easy check of the input audio level using just an oscilloscope. Can one look for clipping (or some other symptom) that

Will the D4D work with Fox / Hound Dxpeditions?