A ham in another club had a similar issue. They had wound T1 incorrectly. So maybe start there.?

I've only built 2 20m QCX but both required taking two turns off L3.

73, Mike KK7ER

开云体育

Anybody, anybody, please... :-)

On Sun, Feb 5, 2023 at 07:18 PM, Mitch Matteau N0DIM wrote:

Moonraker Whizz Whip

Hi Mitch

try this one

73 Muhsin TA1MHS

Why not use adjustable inductors?

Or add a pad-footprint for a suitable adjustable inductor and let builders install such parts if they want?

I find that I enjoy winding toroidal coils (since the crochet-hook thread a couple months ago!), but I don't like adjusting them when tweaking up a circuit.? Spreading/compressing/adding/removing turns.? I would gladly pay a buck or two per coil to have the easy adjustability and avoid desoldering rework.

Do adjustable inductors have too-low of power handling capability?? Too-high of Q, so insufficient bandwidth once tuned?

Ignorant minds want to know.? We aren't all RF designers!

Rich
-- who took turns off of almost every toroid on a couple of truSDX radios last summer!

Wanting to go pedestrian (digital) mobile and wondered if anyone has experience with the Moonraker Whizz Whip working with the QDX, or any other small, portable antenna that could work with the QDX?

I looked at the SuperAntenna but figured that it might be overkill.

I normally use an NY4G End Fed wire antenna with great success but need an antenna that will work when there is nothing around to support it.

TIA,
--

73

?

Mitch N0DIM ()

There's a little-known secret about ferrites. Almost all
frequency-dependent ferrite devices are adjustable, because ferrite
devices are made from a material that varies from day to day ... and
nowadays it really IS because of the mud that the Chinese scooped up
from the side of the river that morning. I used to say that as a
joke, but today it's true....

If you'd care to test, and if your junk box is deep enough that you
have several "identical" ferrites, all from different batches and from
as many vendors as possible, try winding up as many inductors as you
can, as look-alike the same as you can, and measure inductance.

You may be surprised at the variance. Then, look at the specified
tolerances on modern electrolytic capacitors and vintage carbon
resistors. So you'll understand why we tolerate these intolerances
;) But it's annoying when we can't adjust our toroids with a golden
screwdriver.

I can't think of anything in my hobbyist electronics experience that
matches tuning toroids, but I am aware of what was still in modern
memory when I started my electronics tinkering in the 4th grade
(1966). Who has a grid dip meter? Who still has their FIRST grid dip
meter? If you are unsure about what the microVNA and antenna meters
like the MFJ-259 replaced, then you need to get an ARRL (or Bill Orr,
or RSGB) handbook from about 1957 to see how marvelous our new stuff
truly is. I should probably do that today, even though I remember our
modern marvels every time I look at my radios.

73
Jim N6OTQ

On Sun, Feb 5, 2023 at 10:13 AM, Stefan wrote:

Hallo zusammen,
Leider wird mein QDX-Transceiver zur Zeit nicht von Windows 11 und Windows 10 erkannt, obwohl dies früher funktionierte.
Ich gehe mal davon aus, dass es wohl im Ger?t irgendwas gehimmelt hat.
Was k?nnte hier die meiste Fehlerursache sein?
Ich habe auch schon verschiedenste USB-Kabel ausprobiert, auch solche welche sicher funktionieren, leider aber ohne Erfolg. Was kann ich hier noch unternehmen?
Also kann es kein Treiberproblem sein oder ?
Danke schon mal im Voraus.
Da ich nicht immer am PC bin, kann es auch mit den Antworten dauern. Werde aber auf alle F?lle Rückmeldung geben.

Hello Together,
Windows 11 Home and Windows 10 doesn't recognize my QDX. I've tested any USB-Cables, but no one has a effect. It isn't a Driverproblem or not? So I come to the thougt, that anything in the QDX is gone to heaven :-). What can I do or repair on the QDX?
Thanks in forward.
Im not always on the PC, but I will read the answers in the forum.

Vy 73 de DC4KJS (Stefan)

The Powerled on the QDX is always on. It seems that the QDX is still working, but my PC can not recognize my QDX.

开云体育

I like GridTracker, a litle fiddly to set up, but it's been running flawlessly for over a year.

Hallo zusammen,
Leider wird mein QDX-Transceiver zur Zeit nicht von Windows 11 und Windows 10 erkannt, obwohl dies früher funktionierte.
Ich gehe mal davon aus, dass es wohl im Ger?t irgendwas gehimmelt hat.
Was k?nnte hier die meiste Fehlerursache sein?
Ich habe auch schon verschiedenste USB-Kabel ausprobiert, auch solche welche sicher funktionieren, leider aber ohne Erfolg. Was kann ich hier noch unternehmen?
Also kann es kein Treiberproblem sein oder ?
Danke schon mal im Voraus.
Da ich nicht immer am PC bin, kann es auch mit den Antworten dauern. Werde aber auf alle F?lle Rückmeldung geben.

Hello Together,
Windows 11 Home and Windows 10 doesn't recognize my QDX. I've tested any USB-Cables, but no one has a effect. It isn't a Driverproblem or not? So I come to the thougt, that anything in the QDX is gone to heaven :-). What can I do or repair on the QDX?
Thanks in forward.
Im not always on the PC, but I will read the answers in the forum.

Vy 73 de DC4KJS (Stefan)

I just installed cqrlog.. I really like it. At the moment I'm trying to get it to log ft4/ ft8 contacts.

Wes?
--
wes377@...

I know that finals can be destroyed in milliseconds, that's is exactly why a PTT input is needed.
The first thing the AH-4 does at the start of the tuning process is connect the transmitter output to a resistive bridge, presenting a load close to 50+j0 to it, then it activates the PTT signal to the tx and uses small part of the RF energy to run the tuning process. At the end of it, the AT removes the PTT signal, bypasses the bridge and informs the result of the tuning process. Having a PTT input will protect the finals during the tuning, allowing us to use the AH-4 with the QDX safely.
73's Sergio.

Thanks G4ZFQ. I found AC0Cs common base High Dynamic Range RF Amp. This is very broadly similar to a common gate FET circuit I was considering (http://www.ham-radio.com/n6ca/50MHz/50appnotes/U310.html).
I am thinking will give the MAR-6 monolithic a go but may try a prototype common gate/base circuit as a lash up in RX only just to see how much gain might fix the sensitivity issue.

I have the AGC module fitted which limits space a little. Trying to maintain the nice break-in feature is a good point. It would be desireable to have the pre- amp inside withing the RX chain. It's not like I need the pre-amp for the QCX's I have for 40/20/17m. Therefore, will give G0FTDs monolithic amp a try and see if it can be shoehorned in somewhere.

Thanks, this looks good. I just ordered some MAR-6 monolithic amps. Around 20dB gain with 3dB noise sounds good. Also, the circuit may be small enough to fit inside the case in the RX chain only?

On Sun, Feb 5, 2023 at 12:58 AM, GM0HUU Steve wrote:
Has anyone got any suggestions for a pre-amp circuit?

Steve,

If it has to fit inside then Andy's suggestion is probably the easiest.
I am intending a larger version of a QDX, I favour Nortons. Look here down to High Dynamic Range RF Amp.
I've built quite few of these, they seem to work well. In my high power VHF signal area a LPF may help - but the QDX has one..

73 Alan G4ZFQ

On Sat, Feb 4, 2023 at 11:45 PM, bobfox wrote:

My wife and my daughter asked me about this “Chinese spy balloon”, I told them “Don’t worry, they already use Tik-Tok to spy on you.”

The Chinese are only copying Microsoft ;-)
?
--
- 73 de Andy -