Date   

Re: QCX/QCX+ Serial number 10,000 auction for fun

Ted 2E0THH
 

10,000 sales of a little miracle radio that has changed many peoples lives.

Huge congratulations Hans!

73s Ted

2E0THH


Re: Low Voltage in QCX

Jelle
 

Good morning Kevin,

I have the same issue. T1 windings 6,7 at 1.77V. This is the same as pull-up point between R2 and R1. I find an in-circuit resistance of 5k over R2. But I don't see where that would come from. And under these circumstances I get a BPF Peak of only scale x4 with 7+2 bars. Keeping a close eye on this message.

Many thanks, Jelle


Re: QCX60 LPF adjustments

Tisha Hayes
 

I would suggest sweeping the LPF's to see what the 3dB corner frequency is, the insertion loss in the passband and the -20dB/decade roll off. Its possible for you to change values that decreases insertion loss, giving you a higher power output, but it destroys the low pass filter characteristics.

There are plenty of tools for modeling a Chebechev PI filter but they do a terrible job when considering the source or load impedances. The only way to really know is to measure performance while it is in circuit. (you could do this by measuring power output and plotting it as you increment frequencies by 50-100 Hz above and below the corner frequency). It's an old-school way of going about it but since it is much more complicated to create the input and output circuits and then to use a sweep generator, it will give you faster, reasonably accurate results.
--
Tisha Hayes, AA4HA
Sr Engineer, 4RF Inc.


Re: QCX-SSB: SSB with your QCX transceiver

@KC2TAU
 

I was wondering when the QCX+ is released and shipped out to users if the QCX-SSB manual will, in time, be added to in order to show new owners of the QCX+ transceiver how to modify their transceiver to QCX-SSB specifications?

- Mike


Low Voltage in QCX

Kevin Keppler
 

All,

 

Unable to get peak or null in RCV alignment steps.  Voltage between R1 and R2 reads 1.8V.  With T1 and IC4 disconnected, voltage between R1 and R2 reads 2.46V. 

 

Before I disconnected some leads on T1, it showed continuity across each winding.  Does this mean IC4 has a problem?  IC5 and associated?

 

Kevin AE1EI

 

 

Sent from Mail for Windows 10

 


Re: QCX-SSB: SSB with your QCX transceiver

Ryan Flowers
 

While I didn't get mine finished tonight, I did make a lot of progress. All of the major components are installed. But since I'm going to be putting this in a custom case, I'm not putting all the controls on yet until I have time to understand them more fully. 

Regarding my worry this morning about whether using a Nano to do the programming would work, my concerns were unfounded. I followed Manuel's instructions as closely as I could (I couldn't burn a bootloader on the Nano for some reason) and just made sure I had the wiring correct. I did at one point have to switch to Uno before burning the boot loader, and then used the AVR as ISP to burn the sketch to the QCX. The result:

Perhaps tomorrow I'll get further along with it. Or maybe I'll sit on it until my brain rests a little. Oh, and do you see that 50 year old resistor down by IC5? ;-) 

--
Ryan Flowers - W7RLF
MiscDotGeek - QRP and More


Re: QCX CAT returning corrupted packets #cat #qcx

Dean Smith
 

Try T1.05 @38400!
all bugs sorted :)
T1.04 went through a lot of revisions to straighten The Cat Functionality.


Re: 50W QCX Amplifier DC Power Source

George Korper
 

The top of the battery has 4 spring lugs the charger slides into. If you look closely you will see the two outside lugs are marked positive and negative. You can slide a pin from an  Anderson powerpole  connector or a large bare tinned wire into the slot. 
I use a 15 volt voltage regulator for the QCX barefoot and a 12 volt regulator when I am running the AMP. So I make two sets of leads. I use pretinned DC coaxial connectors that are on the AMP and QCX  Bama case.

I just purchased two 6 amp hour 20 volt batteries for $40 on Amazon. For moderate use they last long enough for a day of QSO's each. The voltage stays above 19.5 under full load. They are good quality and the case is well made.


On Fri, May 15, 2020, 3:17 PM John Morris <k7rld@...> wrote:
George. I assume you are referring to power tool replacement batteries at HD or Lowes. Most newer power tools do use the 20vdc type, you are right. That would certainly be a solution for taking the 50W amp out for portable use along with the QCX. I wonder how you made the connections. Maybe made some special connector to slide onto the battery to emulate the receiver for that charger.
I'd be interested in how you did it.

John / K7RLD


QCX CAT returning corrupted packets #cat #qcx

Ham Radio
 

When being polled by Commander,  using Rev T1.04 at 9600 bps, the QCX is returning corrupted packets.

Please see attached trace file from Commander for details.

Not sure exactly what is the problem here ....


--
73, Bernie, VE3FWF


Re: QlG1 having reception issues

HB
 

Mike...
Thanks for the reply.

It had sat on the front porch for 2 days with the green LED blinking.  Here is more info to my problem...

I have a 5 pin molex connector connected to the 12 pin header on the prog rock - connected starting at CLK1 and left over to GND.  Only CLK0 and the GND pin (between CLK0 and CLK2) are connected.  They are connected to a 7 foot piece of LMR-100 coax terminated into a SMA connector for my Elecraft K3s.  

If I disconnect the molex connector with the coax, the GPS receives fine in my hamshack.  If the connector with the coax is connected, the green LED stops blinking and the yellow LED flashes sporadically. It doesn't matter if the coax is connected to my K3s or not.  Now if I go outside to the porch, the GPS receives fine even with the coax connected.  What gives????

Hank
K4HYJ


Re: QlG1 having reception issues

Mike Besemer - WM4B
 

Hank,

 

Has the device been power on with a clear view of the sky long enough to download the constellation data?  See Page 9 of the manual under “LED Indication in Operation”.

 

Mike

WM4B

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of HB via groups.io
Sent: Friday, May 15, 2020 8:22 PM
To: QRPLabs@groups.io
Subject: [QRPLabs] QlG1 having reception issues

 

Hey Folks...
After searching around here in the archives, I think my newly built kit doesn't work correctly.  I built the QlG1 in conjunction with the ProgRock.  It is powered from the progrock.  The unit works fine outside - lay it on the front porch and the yellow light and green light both flash rather consistently.  If I bring it inside and lay it in the window the green light stops flashing and the yellow light double flashes rather quickly.  I can't seem to find anywhere in my ham shack  - even at the window where the green light will flash.

It has the plastic standoffs installed and it sitting on a wooden sill.  Is there someway I could have hampered the sensitivity?

I'm using shielded cable between the progrock and the qlg1 (shield connected to the qlg1 and open at the progrock end - power is also inside the shielded cable).

Any ideas?
Hank
K4HYJ


Re: QCX-SSB: SSB with your QCX transceiver

jjpurdum
 

Ken:

I'm horribly biased, but look at Beginning C for Arduino and read the reviews on Amazon and see if that might be what you're looking for. It's written for someone with no programming experience, but doesn't talk down to you like you're an idiot, either.

Jack, W8TEE

On Friday, May 15, 2020, 7:57:33 PM EDT, Kenneth Delap via groups.io <zz663@...> wrote:


Being a complete newbe to all of the  programming world on these micro processers I just used my engineering thinking. May not have be the exact way to solve the problem if you under stand this code line world I don't at this point, but it worked! Going to have to go down the rabbit hole on the programming. Would have no idea how to change a line of code but want to learn how to do this. Any direction on some basic places to learn about would be great.

73 all
Ken KX9U


Re: WSPR

Scott - N1ST
 

I spent time over the the last 3 days trying to figure out why I can no longer receive WSPR reports.  Even started checking voltages looking for faults.  Thanks John!

My 3.5w on 80m was just heard by DP0GVN 13,484km away.

Hans - any chance the firmware could be programmed to only accept even Start minutes and put a note in the manual that it should be even?

Scott


Re: QCX-SSB: SSB with your QCX transceiver

 

Might swell, might as well get yourself an Arduino and a couple of books on it. It's embedded systems programming learning with training wheels for the down-n-dirty bit-diddling hardware  stuff, but that's perfectly OK, it'll give you a steep but comfortable learning curve.
Many folk turn their noses up at Arduino, but that's just snobbery: misplaced and not helpful.


QlG1 having reception issues

HB
 

Hey Folks...
After searching around here in the archives, I think my newly built kit doesn't work correctly.  I built the QlG1 in conjunction with the ProgRock.  It is powered from the progrock.  The unit works fine outside - lay it on the front porch and the yellow light and green light both flash rather consistently.  If I bring it inside and lay it in the window the green light stops flashing and the yellow light double flashes rather quickly.  I can't seem to find anywhere in my ham shack  - even at the window where the green light will flash.

It has the plastic standoffs installed and it sitting on a wooden sill.  Is there someway I could have hampered the sensitivity?

I'm using shielded cable between the progrock and the qlg1 (shield connected to the qlg1 and open at the progrock end - power is also inside the shielded cable).

Any ideas?
Hank
K4HYJ


Re: battery recommendations for portable ops? (Lithium AA and AAA cells)

Arv Evans
 

Brad

Lots of information at Battery University.  

My understanding is that as the cell discharges the internal resistance 
increases, not decreases.  I could be wrong!

Lithium cells have a different discharge versus voltage curve from NiMH 
cells.  They act more like capacitors because the output voltage decreases 
at a constant rate as they are discharged.  NiMH seem to hold their 
output voltage as they discharge and then decrease voltage rapidly as 
they near total discharge.  This voltage characteristic is what requires 
voltage regulators for Li-ion where you might get by without one for NiMH.

There is a lot of myth, fear, hysteria, and misinformation about Lithium cells 
available on the Internet.  One really has to do your one experiments and 
decide which is correct, assumption, or outright lies.  

Arv
_._

On Fri, May 15, 2020 at 3:20 PM Brad Thompson <brad.thompsonaa1ip@...> wrote:
Arv Evans wrote on 5/14/2020 4:02 PM:

That effect is well known and is related to internal resistance within the cell.

Hello--
Thank you for your comment. Based on the behavior of manganese-alkaline cells, I would
expect that internal resistance of individual lithium cells  connected in series to decrease
at approximately the same rate as the cells discharge.

Could  you provide a reference to lithium cells' internal resistance behavior?

If this effect is well known, I wouldn't trust lithium cells in a QRP rig because of their unpredictability.

Thanks, and 73--

Brad  AA1IP
_._


On Thu, May 14, 2020 at 1:29 PM Brad Thompson <brad.thompsonaa1ip@...> wrote:

-- Hello--

I've encountered a couple of instances in which lithium nonrechargeable cells (mostly AA and a few AAA)
discharged in an odd fashion. Given two cells in series, one cell gets depleted before
the remaining cell. For example, cell #1 drops to 0.42 volts (no load) while cell #2 measures 1.3 volts (no load)

Garden-variety alkaline (*)  cells in the same device will drop to, say, 1.2 volts each (no load),
more or less equal in voltage.

I haven't explored further, but I'm curious if anyone else has noticed this effect?

73--

Brad  AA1IP
Sent from Postbox


Re: QCX-SSB: SSB with your QCX transceiver

Kenneth Delap
 

Being a complete newbe to all of the  programming world on these micro processers I just used my engineering thinking. May not have be the exact way to solve the problem if you under stand this code line world I don't at this point, but it worked! Going to have to go down the rabbit hole on the programming. Would have no idea how to change a line of code but want to learn how to do this. Any direction on some basic places to learn about would be great.

73 all
Ken KX9U


Re: 28 pin socket... #40m #qcx

Mike Besemer - WM4B
 

Get yourself a socket too.  That way if you ever brick a chip trying to update the firmware you can easily swap it out.

Mike
WM4B

On May 15, 2020 6:12 PM, "B.A. Black" <k5bez1@...> wrote:
yes, it appears that the + side of the cap is connected to #7

i think i'll go ahead and order another ATMega from Hans..
i appreciate all the help..

this is way above my pay grade!

thanks
Brett
K5BEZ


Re: 28 pin socket... #40m #qcx

B.A. Black
 

Not that my test methods are up to standard! Hi hi


Re: QCX+ video

Manuel; DL2MAN
 

Hi Hans,

When I heard QCX Plus, I thought finally you arranged some kind of AGC. That's the only thing I'm really missing. So I was a little disappointed, when I realized only a facelift....

As you pointed out in your video, all the mechanical constraints have been solved one or the other way.
The priority number one for any rig is usability. 
Missing AGC can be a very painful constraint, as I had to experience myself....

So I personally don't really see the plus at qcx plus, as the rig itsself is unchanged.
Sorry. Only my personal opinion.
But your points are valid and I'm sure there will be people upgrading.

73 Manuel DL2MAN