Hey Gang, Last night I tried out the JT9A digital mode using my CS-40 (40M band). The farthest QSO achieved using about 7 to 8 watts TX power was 4049 km (2516 miles). My CS-40 has a FT50-43 final

Thanks for the advice. I traced back and found an old fix that I did about 2 months ago (when I last worked on the kit.) One of the leads for the crystal in the single pole IF amp filter had broken

John, Unless I'm mis-reading the schematic, there definitely shouldn't be 8v DC on pin 1. 8v DC on pin 8 is normal. I think now I'd carefully work back from pin 1 along the affected circuit to try

I'm afraid I don't have a second mixer IC, but I pulled off the one giving weird readings and measured the voltage on the pins. All pins are 0 volts except 1 and 8, which were 8 volts. John VA7JBE

Since many of those measurements you're getting on the NE602AN mixer IC are indeed abnormal (and seemingly impossible unless internal or external components are damaged), I think next I'd try removing

Hi John, I've observed this behavior while using both the microphone and shorting pins 5 and 8 of the connector without the microphone attached. Cheers, John VA7JBE

Hey John, Have you ruled out if the PTT switch inside the microphone could be the cause of the problem by manually grounding the PTT line at the microphone connector? It's pin number 5 of the 8-pin

Hi Folks, Some funny things have been happening with my new CS-40 kit. 1) Intermittent relay flip on PTT. Sometimes the relays go, sometimes they don't. I have no idea what the issue might be here

Tonight I made my farthest confirmed QSO yet using the CS-17 and FT8 on 17M with only 5 watts TX power... 4593 miles (7392 km) from the USA to Japan! I received a good strong signal report

Adam, Thank you for the reply. OK, let me see if I have everything correct... Please let me know if anything is wrong with the above. I'm finding out that trying to properly evaluate DIY7 filters

John, Although I haven't tested the BPF for CS-Series due to impedance mismatch, I can try to answer your questions: 1. The resonating frequency will be a bit lower (so

Adam, This is great information! I have some additional questions about using DIY7 transformers and hope you might know the answers. 1. In a twin DIY7 filter setup such as used in the KN-Q7A and

Gang, I buit a test fixture for DG8SAQ VNWA 3 (bought from http://sdr-kits.net) yesterday and did some measurements. I finally found the reason why my recent BITX receiver didn't sound loud

Your chocolate perf board projects are inspiring Adam! Thank you for sharing them with us. 73, John AA7US ---In CHINA_QRP@..., <rongxh@...> wrote : This video showed my recent two projects based on

When I talked about the magnetic loop antenna, I meant VK3YE's brilliant idea of tuning. See this video: https://youtu.be/Cv_RnLpZ9gw Thanks, Adam 在 2017年8月31日，上午1:41，Adam Rong

Nice job. If you keep it 5 watt for 50% duty, I think the original FT37-43 toroid should be fine. FT8 is really hot these days. I think probably it is a good idea to get a magnetic loop antenna (even

Gang, This video showed my recent two projects based on Choc Perfboard. You can see many details, although it is in portrait mode. https://youtu.be/Qm6i10krRgA Thanks, Adam

In less than 2 hours this afternoon I made 20 confirmed QSO's all across North America with a new the new FT8 digital mode and a CS-17 transceiver (17M band). Operating was done on 12.7v battery

Thanks so much, actually the schematic and assembly instructions were downloaded from your website before I put it together and I bought new toroids and rewound those to no avail. I don't know what I

Not sure if it will help but I worked on one with a bad transformer (t1) and also had another with bad toroids, don't remember if I saw anything on the collector of Q3 at the time with either issue.