My piece of advice a little bit late but anyway. I strongly recommend to create such Balun (and add to each transceiver, if possible) . The most important thin 20k Ohms 2W resistor and Surge

I have just received a bundle of paperwork from FedEx demanding payment of £548.54 for the May package I received from Hans. The package was shown by Hans as having a value of 3.630 USD. From the

As a former metrology engineer in the federal metrologic research institute, I assume you will not need any matching circuits for measuring your LPF using NanoVNA. Just calibrate it as usual and

Hard to tell just from symptoms. If just the receiver was deaf, I would suspect either Q5 (BS170) OR IC4 (FST3253). I've replaced the FST3253 on someone's softrock receiver when a nearby lightening

Thanks Julian, sounds great. I've sent you a pm email. Thanks, Tim From: QRPLabs@groups.io <QRPLabs@groups.io> on behalf of Julian N4JO <n4jo@...> Sent: Thursday, June 24, 2021 1:35 AM To:

Mont, I can't thank you enough for your help. It helped me isolate the problem to the main board and I learned a lot about the QCX. On the first power it up, it was emitting a loud tone through the

Rod, Yes, you are right. I did the same but a little backwards. I tuned L4 for PA output for max amplitude using dummy load soldered to PA output. Than just add L1-L3 and got about ~5.3W from 12V

I agree. In 1973 when things were hot I built a Heathkit HW7 and used a wire tied around a tree branch 25’ from my shack window for a test antenna. Worked the world on 15 meters. Never did build

Hi Yury. I think that once the LPF is good at 50 ohms we can tune L4 or C30(from memory) for max output and all is then sorted. Best wishes Rod G0VKX

Hi Alan, Many thanks. I also can hear audio clicks for VFO tune with connected antenna and noise level about S5-S6. The clicks level increases with gain and always stronger than noise floor.Agree,

Hello Jerry, - "Why does my interest in Amateur Radio always peak at the bottom of the sunspot cycle?" Because it is too easy at the peak of the sunpsot cycle! 73, Roelof, pa0rdt

There is a lot of audio gain. There are also the SCL and SDA control lines to the Si5351. Not so easy to isolate those. 73 Alan G4ZFQ

This is all very interesting but I would like to return topic to the original stream. Probably it would be better created separated thread for such discussion for avoiding mess. My yesterday

Chris, Read these Abt building QCX and tuning LPF before doing the rest https://on7dq.blogspot.com/2020/12/some-notes-on-qcx-mini.html And for NanoVna, study my

I am one of those who will repair at cost of parts and shipping. -- Julian, N4JO.

On Wed, Jun 23, 2021 at 02:09 PM, Timothy Freeze wrote: I just received a complete 80 M kit, built the display, and put the header pin in upside down. I'm so dumb. I had to remove the 10 pin header

Thank you for wishing me well. I was not too worried about it because thunderstorms are rare hear, but just my luck one hit today. KQ6UP On 6/23/21 8:31 PM, VK5EEE wrote:

The formula for a PP amp whether CT type or phasing transformer type is Z drain to drain = 2 * ( Vcc- Vmin) squared / Power out. all in consistent units. Vmin is sometimes taken to be 2

I'm not able to help, but I'm wondering if the solution to a mystery here is the thunderstorm? In my case, the TX was already not working, but the RX was fine. That afternoon, there was a thunderstorm

Did you try swapping out the IC2 for one where the display is good? I did that and the display worked again as it also got the row of blocks on the top, but, the RX has also gone. Both RX and display