From your description, I suspect that IC5 is toast. The oscilloscope is the best check, as with the BS170s installed, the gate capacitance can distort the signal out of IC5. You should get close to sq

#troubleshooting #qdx

Marc, I would run the RF and Audio sweeps in the Terminal program. See if you are getting the upper and lower sideband separation in the audio sweep and what the RF sweep looks like on 40meters. There

#troubleshooting #qdx

I have a similar issue and getting about 1.5v on the gates of the BS170s. I'll check with a scope as well, but I guess this points to IC5? I have one on order, but before attempting my first 14 pin SM

#troubleshooting #qdx

Evan, I just tried 40M on the antenna and only getting 11db on the meter and no decode. My KX3 was getting contacts on same antenna. What is next?

#troubleshooting #qdx

Thanks, Rob. That makes sense. 73, Mike KK7ER

#qdx #bluetooth

Marc, Good news. You do not need to put the BS170s in to test the receiver. I would test the receive first in case of an issue with IC5. The steps are to verify the receiver, test IC5, then install th

#troubleshooting #qdx

Evan The link you posted is the page I used (great minds think alike). I used 5V, the resistor from Gate to Source was 1K, the other resistor from + to LED was 2.2K. The LED was a solid light when I f

#troubleshooting #qdx

Roger, I thought I needed to put the meter in series, but it didn’t work for me. I will have to test again, I may have had a bad connection. Thank you for confirming my initial thoughts, that I quickl

#troubleshooting #qdx

A lossy line (e.g. old coaxial cable) "improves" SWR :-) Miloš OK1FMY

#qdx #antenna

But it’s not Ethernet, it’s TIA 568, and while Ethernet WiFi adapters are a dime a dozen, there’s no such thing as TIA568 to WiFi for any arbitrary physical layer that might be on the wire. 73, Willie

#qdx #bluetooth

As I read the information on this device ( https://www.amazon.com/AV-Access-Extender-Operating-Synchronously/dp/B01EV33R8S/ref=sr_1_4 ), I don't think plugging a USB WiFi dongle into it alone would do

#qdx #bluetooth

Hi Willie, You missed my point about adding a WiFi adapter at each end. 73, Mike KK7ER

#qdx #bluetooth

For a theoretical no loss transmission line, SWR does not vary along the line. For a lossy line, the SWR will increase somewhat (depending upon the loss) from source to load (transmitter to antenna).

#qdx #antenna

Hi I would just like to add my two penny worth. A swr meter only measures SWR at the point where it is added in the transmission line. I ideal place is at the aerial, if you have 1:1 here at 50 ohms a

#qdx #antenna

Hello Alan It may be a mix-up of terminology and perhaps I am using incorrect terms or explaining poorly, my apologies if so. It's best understood by analogy to a conventional superheterodyne receiver

#qdx

Hans, I came across your comment and wondered what it meant. I was under the impression IQ balance was responsible for reducing, if not eliminating image responses. The unwanted sideband is an image.

#qdx

I do the same with my FT-818 instead of QDX. It works great. PI 4 headless controlled by the smartphone through VNC over wifi is a wonderful solution. Moreover, if the PI is connected to the internet

#qdx #bluetooth

Got my QDX kit on July 25 and got to find the artwork error on my own before the new build instructions were posted. It seems to be working OK except there is a weirdness. IC-9 likes to live around 2.

#qdx

Hi Colin, You are correct. To get the drive needed to overcome the capacitance in the gates of the BS170, you need the two gates of the 74ACT08 in parallel. If one of the two gates has failed, it will

#troubleshooting #qdx

“ If any fail this test, you will need to replace IC5, the 74ACT08 transmitter driver.” It is notable that this chip has 4 and gates and they are used in parallel. Two gates in parallel are linked to

#troubleshooting #qdx