This is the kind of meter I was talking about. Cheap and easy to build.

Yes? - I've been there and done that and got it entirely wrong. Last Christmas Eve, I came by an unbuilt QCX kit from about 2017. I built it up on Christmas Eve evening and had it working by midnight. Then, listening on my Kiwi SDR , and transmitting on a dummy load, I could see sprogies all over the place at harmonic intervals and elsewhere too. I was simply overwhelming the receiver and creating mirages.? I'm sure that if you built the LPF to the specs provided and have been able to tune it for good power output, you have done it right and your transmitter will be fine.

If you really do think something is amiss, get someone to check the harmonics? a couple of miles away when you are transmitting on an aerial. Or you could use one of those old fashioned wave meter things we used to build in the 1980s. They were a sort of crystal set with a variable capacitor, a suitable coil and a small meter. You could scan for the fundamental, adjust the meter sensitivity for full scale and then slowly open the vanes of the variable cap and look for peaks at the harmonics.?

开云体育

George,

As to the voltage input, the connector is a different size. The 12 v kit connector will not plug into the 5 v kits. I suppose you could fuss around and briefly apply 12v.?

I plug and play Windows 10 and Kali hard disks provided they have the same word widths ie 32bits or 64bits? (32 works in a 64 bit machine)

at the very beginning they seach for missing drivers, then they work

Dean,

Glad to hear you got it fixed!!

Even Happier Holidays, now!!

--Al

On Wed, Dec 22, 2021 at 09:57 AM, William Smith wrote:

We should ideally first briefly reproduce the latest relevant quote to be responded to,
then respond *below* it.

Naw, I prefer responding above it. #TopPostingRules

If you see what I did there.

Yes, Willie, I saw what you did...

I prefer bottom posting too, but it takes a bit more effort.
In contrast, though, I sort my mailbox "most recent first", which makes the threaded view "interesting".

Speaking of which... my big issue is thread hijacking, were people respond to a message in a thread then talk about something completely different. It messes up thread-based indentation in email clients "something terrible", even when the perps rewrite the subject line.
I think it must be that it isn't obvious how to start a new thread.


?
--
Julian, N4JO.

Hi Muhsin,

It seems very unlikely that RF-in-the-shack is causing this (ERP of the dummy load must be pretty low).
If that were the case, I should see it with WSJTX too.
It seems more likely that JTDX is aborting for some reason.
I guess enabling CAT logging in the QDX would tell for sure.

73, Mike KK7ER

Steve G4EDG:? Practice mode sounds perfect.?

Al WD4AH:? I replaced C21 and C22.? No improvement.?

But... Al's suggestion got me thinking.? What about C24?? I recall reading that later QCX versions replaced this 10 uF cap with a 470 uF cap to reduce "thump".? So I replaced C24 with a 470 uF cap from the parts bin, and that did the trick!? My sidetone is fixed!? I can only assume the original C24 was leaky.?

Thanks for all of the help, guys!? This group is very helpful!? I hope I can somehow return the favor someday.?

Merry Christmas and Happy New Year from The Republic of Texas!?

--
73/72,
Dean K5DH

?? The VFO signal generator kit comes with a switching LPF? kit and the assembly instructions with it set up a default set of 6 jumpers that need to be installed.? I assume that this is the setup one wants to use if it is going to be installed in the signal generator and not the other device that this document refers to.? Then all one has to do is setup the frequency limits in the setup menu and one is good to go! I just need to verify that this is the correct procedure to making this thing.
??? Also, from looking at the schematic of this signal generator I see that this whole thing is powered by 5Vdc according to the diagram.? I find it kind of strange that this kit uses this supply voltage and all the others, including the ProgRoc, use 12 - 15Vdc. This makes it quite susceptible to using the wrong input power and blowing the whole thing up if one is not careful.
73
wt1v

here's a shot receiving 20M USB.

Mark,

If anyone want to use it like that then really it could be modified.
The peak in noise around the centre (more gain) spoils it but, yes, you get a ~48KHz view.
C39-43 are far too big and probably the feedback around IC7, C44,45 could be reduced.
I'm not sure how that would affect normal QDX operation.

Although I have not tried, is it less sensitive to signals away from the centre? Are weak signals better near the centre? Check on 20m, any difference is more likely to be seen there.

73 Alan G4ZFQ

Thank you Steve. The finish on this #28 wire is?
perfect, without the rough finish tinning by iron
can leave. A blob that works!?

I host an informal digital play group Monday night at 9:00pm ET on 7.073? We are typically east cost of USA, but our signal can go anyplace. You never know. hahah.

If we know someone wants to try out their QDX's ability to decode, this might be a opportunity?? ?

We start with Olivia, then quickly switch to different digital modes (dominoEX, Thor, Throb, RTTY, Contestia, etc. etc.).? If your RxID is on, you can follow along and mode switches will happen automatically, more or less. Most of us use Fldigi, or HRD, etc.

We use zoom to (1) try to stay in sync? during mode changes (2) sometimes get short (20-30 min) presentations, (3) make up for poor propagation, and (4) and to have fun as a group as we try different modes.? At times, we watch presenters on digital radio topics (e.g., DMR/Fusion/etc., SSTV, Field Hell, PSK, FreeDV, JS8Call, Gridtracker, etc. etc.).? If we are watching something on zoom, we may not have much radio signal going on, until we get back playing actual radio. hahah. Just FYI.?

This is not a directed net. We just want to have fun with different non-FT8 digital modes.??

If you want to use our digital modes to try out decoding on your QDX, that would be fantastic!!!? If you can zoom while you do that, and share your screen, we would all learn something, and we all like to learn and see new things. And the QDX in operation would be a hoot to see and watch.? And we can use any digital modes you would like to test on.? Just join us on zoom and we will work together.

So there is an option for seeing and testing multiple non-FT8 digital modes.

Here is the zoom link.



If you want a calendar invite, just ask me. No problem!

Don
km4udx

Scott

Wow nicely integrated, as long as operator arm doesn't get tangled in the wires. I don't see 80m so we can't qso with my 80m qcx plus. Yeah a small garden vertical g7sed? Can get you on 80m.?

What are those nice power supplies?

Thanks for showing us your station. CW still rocks.?

Curt