Date   

5 photos uploaded #photo-notice

QRPLabs@groups.io Notification <noreply@...>
 

The following photos have been uploaded to the 3D printed enclosure for QCX+ album of the QRPLabs@groups.io group.

By: Jarosław Grzegorzek <astro@...>


Re: Audio "click" during knob rotation

Yury Krasouski
 

Here are small updates from investigation audio clicks.

I connected EM14 (EM14R0D-R20-L032S) optical encoder and this did not change anything with clicks. Clicks still present and much louder that background noise with connected LW antenna on 40m.

The good news is that optical encoder works like a charm with QCX mini. Thus, if you have custom enclosure for your QCX it is worth to install it to have VFO knob like in expensive rigs =)

Also I noticed following, if very slowly turning the optical encoder I hear clicks without any change in frequency or menu items change. This looks like I have clicks for each encoder "clock".

Probably I have to check oapms input/output for spikes during turning using my pocket oscilloscope but my ideas run out =)

Here is video with optical encode: https://youtu.be/lM7Ooi_2MVU


Re: 10W HF PA Kit: TX on Low input. How best to implement?

Hans Summers
 

Hi Ken

Right near the top of the page it says:

"The Low Pass Filter kit can handle at least 10W safely."

As I mentioned, the bit about 5W is wrong, and I will update it. It is also wrong where it mentions the use of a micrometals competitor, as this is also no longer the case for quite some time. 

73 Hans G0UPL
http://qrp-labs.com

On Mon, Jun 21, 2021 at 9:09 AM KEN G4APB via groups.io <lfoofui.nbz42=ntlworld.com@groups.io> wrote:
If it says 5W somewhere in the documentation I need to find that and correct it.  
Hi Hans,
if you go to the LPF purchase page in your shop, this description is under ‘Capacitors’…
 
….temperature coefficient (also known as NP0 or C0G). All the capacitors supplied have a voltage rating which is adequate for up to 5W RF.
I don’t know where others are reading 10watts.
73 Ken g4apb 


Re: 10W HF PA Kit: TX on Low input. How best to implement?

KEN G4APB
 

If it says 5W somewhere in the documentation I need to find that and correct it.  
Hi Hans,
if you go to the LPF purchase page in your shop, this description is under ‘Capacitors’…
 
….temperature coefficient (also known as NP0 or C0G). All the capacitors supplied have a voltage rating which is adequate for up to 5W RF.
I don’t know where others are reading 10watts.
73 Ken g4apb 


Re: "G" indicator #40m #qcxmini

Christian Gosch
 

I noticed the same issue with my qcx mini today and noticed that when I used my earphones with microphone and 4-connector plug, I always have a "raspy" side tone. With other headphones that have a 3-connector plug, that issue went away. I also had the "G" issue showing up. I was using a 49:1 transformer and a EFHW more or less directly at the BNC connector of the mini. With or without counterpoise, I was seeing the issue. When I moved the antenna away a little, using about a 1-2m long coax, the "G" issue was no longer present.
FWIW
Christian NV2J


Re: vfo/signal generator frequency

Mont Pierce KM6WT
 

On Sun, Jun 20, 2021 at 04:35 PM, Syd wrote:
When I go below 5.02MHz the sine wave disappears!

On Sun, Jun 20, 2021 at 06:04 PM, Syd wrote:
Additional comment: the signal gets lost at exactly 5 000 000 MHz, at 5 000 001 MHz it works!
Could you provide more info about your setup?

Since you mention "sine wave" it sounds like you have the LPF filter(s) installed, and possibly also the 6-band relay board?

The fact that 5.000.001 MHz works, but 5.000.000 MHz does not, it sounds like you have a "Band Limit" setting set at 5.0 MHz, and it's switching to an LPF that's not working.


73,
km6wt


Re: vfo/signal generator frequency

Arv Evans <arvid.evans@...>
 





On Sun, Jun 20, 2021, 7:04 PM Syd via groups.io <nhuq1=yahoo.com@groups.io> wrote:
Additional comment: the signal gets lost at exactly 5 000 000 MHz, at 5 000 001 MHz it works!
syd


Re: vfo/signal generator frequency

Syd
 

Additional comment: the signal gets lost at exactly 5 000 000 MHz, at 5 000 001 MHz it works!
syd


Re: vfo/signal generator

Mont Pierce KM6WT
 

On Sun, Jun 20, 2021 at 04:44 PM, Syd wrote:
You are absolutely correct that this diagram shows the band switching on this diagram, although it is not on the VFO/Signal Generator diagram!
Hmmm....  just to be fair, and thorough...  there are a couple of items about the VFO/SigGen that I'd forgotten about until I just re-read it today...

The Operating manual page one (click here) says:

        The VFO kit can switch between multiple LPFs using the QRP Labs relay-switched LPF kit http://qrp-labs.com/ultimatelpf-
       
please refer to App Note AN006 for details of this application http://qrp-labs.com/appnotes.


And the App Note AN006 (click here) mentions that the control for up to 6-bands LPF switching was added at firmware version s1.03.  So, it was not part of the original release of the VFO/SigGen...  which kind of explains why it's not shown in the schematics.

Also, the App Note AN006 shows in pretty good detail on how to hook up and configure the 6-band LPFs.


73
km6wt


Re: vfo/signal generator

Syd
 

You are absolutely correct that this diagram shows the band switching on this diagram, although it is not on the VFO/Signal Generator diagram!
txs syd


vfo/signal generator frequency

Syd
 

Having fixed my previous problems with this kit, I am now curious about what seems to be another problem:  I can go over 30 MHz with a nice sine wave, but at the lower end I believe I have a minor problem. When I go below 5.02MHz the sine wave disappears!  No signal at all!!
syd/wt1v


Re: QCX: top row blocks on display, but CPU responds to ISP #avr #display #troubleshooting

jerry@tr2.com
 

Second the motion on resoldering the display pins. I had this very problem yesterday,
and that was the cause. The plating on the pins does not eagerly accept solder, and you
have to insist a little.

- Jerry KF6VB

On 2021-06-20 13:17, Jack M7JDA via groups.io wrote:
I suggest to try the following:
- double check ATmega is properly seated in socket
- resolder socket pins in case there is a dry-joint
- resolder display pins in case there is a dry-joint
Fairly quick things worth ruling out
Links:
------
[1] https://groups.io/g/QRPLabs/message/67521
[2] https://groups.io/mt/83671700/243852
[3] https://groups.io/g/QRPLabs/post
[4] https://groups.io/g/QRPLabs/mutehashtag/avr
[5] https://groups.io/g/QRPLabs/mutehashtag/display
[6] https://groups.io/g/QRPLabs/mutehashtag/troubleshooting
[7] https://groups.io/g/QRPLabs/editsub/243852
[8] https://groups.io/g/QRPLabs/leave/10312280/243852/1190336630/xyzzy


Re: vfo/signal generator

Mont Pierce KM6WT
 

On Sat, Jun 19, 2021 at 12:32 PM, Syd wrote:
But, on page 2, where the schematic is located, I cannot find anything that indicates where these band logic pins are coming from.
You're right.  It is a bit confusing.  However, the Ultimate3S, Clock, and VFO/Signal Generator all use the same QCU PCB.

The assembly manual for the Ultimate3S has more info on the Band select pins and LPF filters.

Check the schematic for Ultimate3S (click here), and you'll see the processor pins used.

Also, at the bottom of the Ultimate3S webpage (click here) there are images of the PCB track layout for the latest "QCU Rev 4" PCB, which is the common PCB for all three of the kits.


73
km6wt


Re: QLG2

Dean Smith
 

I think the idea of back orders would create more frustration to an already dire problem.
Here's hoping that the current global semiconductor shortage,  is short lived.
Best
          G7EOB


Re: 10W HF PA Kit: TX on Low input. How best to implement?

Evan Hand
 

Hi Hans,

I sincerely apologize for the blasphemy.  I do have to admit that I have been dealing with the other QRP providers recently on a couple of kits that QRP-Labs does not offer a kit with a similar function (antenna/tuner and digital mode transceivers).  

I will try to keep it straight from now on.

73
Evan
AC9TU


Re: 10W HF PA Kit: TX on Low input. How best to implement?

Ian MM0GYX
 

On Sun, Jun 20, 2021 at 07:34 PM, Roger Hill wrote:
Well, I get confused every day!

Roger

Apparently you aren't alone in that.
 


Re: QCX: top row blocks on display, but CPU responds to ISP #avr #display #troubleshooting

Jack G5JDA
 

I suggest to try the following:
- double check ATmega is properly seated in socket
- resolder socket pins in case there is a dry-joint
- resolder display pins in case there is a dry-joint

Fairly quick things worth ruling out


Re: 10W HF PA Kit: TX on Low input. How best to implement?

Hans Summers
 

Hi Evan

QRP Labs... QRP-Guys are not the same... Blasphemy!

73 Hans G0UPL
http://qrp-labs.com

On Sun, Jun 20, 2021 at 9:50 PM Evan Hand <elhandjr@...> wrote:
Hi Ken,

The QRP-Guys 50 CW amp has the low pass filter included with the correct capacitors.  The 50watt amp is designed as a single-band amp to match the single band QCX series of transceivers.  

For me, I am using one of two 100watt rated low pass filters.  One from eBay:
https://www.ebay.com/itm/282860312127
or
https://www.minikits.com.au/electronic-kits/high-frequency/hf-filters-lowpass/eme209-kit

I have both and both have about the same filter response.  I tested them with a DIY 100watt kit from eBay.  I had more trouble building the MiniKits filters as the SMD diodes that had to be installed on the select lines were really tricky to get installed correctly.

Since I started this response I see that Hans cleared it up that the QRP-Guys LPF kits are suitable for 10watts.  I would go with those as the build instructions and support are much better than the other two.  I have also read that there have been some shipments of the eBay kit shipped with incorrect components.

Hope this helps,
73
Evan
AC9TU


Re: 10W HF PA Kit: TX on Low input. How best to implement?

Evan Hand
 

Hi Ken,

The QRP-Guys 50 CW amp has the low pass filter included with the correct capacitors.  The 50watt amp is designed as a single-band amp to match the single band QCX series of transceivers.  

For me, I am using one of two 100watt rated low pass filters.  One from eBay:
https://www.ebay.com/itm/282860312127
or
https://www.minikits.com.au/electronic-kits/high-frequency/hf-filters-lowpass/eme209-kit

I have both and both have about the same filter response.  I tested them with a DIY 100watt kit from eBay.  I had more trouble building the MiniKits filters as the SMD diodes that had to be installed on the select lines were really tricky to get installed correctly.

Since I started this response I see that Hans cleared it up that the QRP-Guys LPF kits are suitable for 10watts.  I would go with those as the build instructions and support are much better than the other two.  I have also read that there have been some shipments of the eBay kit shipped with incorrect components.

Hope this helps,
73
Evan
AC9TU


Re: QCX: top row blocks on display, but CPU responds to ISP #avr #display #troubleshooting

Andrea Massucco IZ1IVA
 

On Sun, Jun 20, 2021 at 07:59 PM, Gary Bernard wrote:

Just a long shot, have you adjusted for contrast?
I have.
--
73 de Andrea IZ1IVA - cq at iz1iva . net - http://iz1iva.net