I believe the answer was explained by Hans shortly after the release of the QLG2 in message ? #66657?I use a QGL2 to synch my Win10 computer clock. The data sent to the computer is correct and the displayed data on the QLG2 is, as you note, off by about 1 second. -- 73, Rick VE7TK Website:
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Thanks Hans, my QDX Rev 3 using the High Band Filters works
Hi Hans,
yesterday I finished my rev 3 QDX - I got the KIT one year ago as substitute, if my regular QDX would fail--- but it still works ;) . I bought the Filter parts for the High Band version and according to the newest assembly instructions, I managed to build it up within 5 hours. Installing the newest Firmware (1.09 instead of 1.02) I managed today some QSOs from 20 to 10m . Even DX on 10 and 20m was possible. Power Output between 3 and 5 Watts, using 12.6 V. Now I ordered the Case :)
72 de Matt, DL1SER
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What model is it ? Is it factory assembled ?
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I'm bored with the modes it does.? Sticking with the QCXs and Softrock RXTX Ensembles.
Works fine and has the QRP-Labs enclosure wrapped around it.
$75 plus shipping.
--
Brent DeWitt, AB1LF
Milford, MA
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QDX v3 Dual band version: 30m/20m or 20m/15m
#qdx
At last I am building my v3 QDX and I have decided to avoid the PIN diode biasing issues by populating only one LPF then hard-wiring it into place by replacing one pair of forward-biased PIN diodes with a jumper wire (antenna side) and DC-blocking capacitor (driver side).? And leaving the other PIN diodes and LPF's unpopulated.
If I choose the 30m/20m LPF then I get two band operation.? But my preference is a 20m/15m LPF which I guess can be achieved by scaling the L and C of the 30m/20m version component values by a suitable factor, say, 14MHz/21MHz = 2/3.? Will this work OK or must the filter be re-optimized?? For the RX_BPF my plan is to use the High-band version values.
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Re: So you need 4W out of your QDX QCX??
On Sun, Feb 19, 2023 at 03:57 AM, Dean Smith wrote:
So why kill your BS170's ect, trying for the rf output holy grail of the QRPLabs kit??
Yes, an attenuator at the QDX output will definitely provide some protection.? I burned up my QDX with a 12.5V supply and an antenna with about 1.5:1 SWR.? I replaced that QDX with another one and reduced the supply voltage to 7.5V -- no troubles so far.? A third QDX I have is running with a two-minute key-down cycle and a 12.5V supply, with a 1.1:1 SWR antenna, and I have run that one into a dummy load for one hour straight without issues.? I don't know how repeatable these margins are, but SWR definitely matters. Here is a chart I did showing the input and output SWR when adding an attenuator.? Even a 3dB attenuator can make a good difference. This would of course cut your transmit power in half (not such a big deal) and unless you have a low-gain antenna a 3dB loss won't make much difference in the receive performance: ?I suspect that phase angle (reactance) is as much of an issue as resistive mismatch, and I don't know the limits of what the QDX can truly handle (I discovered what it can't handle!), but adding an attenuator is something to consider.? Be aware that the power rating of an attenuator is for a matched load -- if you short the attenuator output the internal resistors will be dissipating more than the design power rating. -- Paul Elliott - WB6CXC
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I think the "one second late" syndrome is due to the fact that serial data out of the GPS receiver comes after the seconds pulse it refers to.? I expect that the QLG2 with associated display is simply showing the serial data as it is sent from the receiver and hence will always be slightly late.
The multi-second error is due, I believe, to the need to download the correction factor from the satellite data stream.? This gives the difference between "GPS time" to UTC.? The latter includes the effects of leap seconds introduced to keep UTC close to the time given by the Earth's rotation.? The GPS satellites do not themselves adjust for leap seconds so progressively get out of step with UTC.? The difference is sent as a correction factor which, once received, is applied by the GPS receiver to output UTC.? It takes, I believe about 12 minutes for the complete data to be transmitted from the satellite constellation, including the ephemeris info for the satellites etc.
--
Peter Lee
G3SPL
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Sorry Dave. I didn't realize you were talking about menu items on the rig itself. There are two take off points in the circuit feeding into the microcontroller, Labeled Audio 1 and Audio 2. According to the operations manual, Audio channel 1 is looking at the output of the audio amplifier and will depend on the volume control setting. Audio channel 2 is picked up at the output of the phase nulling circuit and is independent of the volume setting, but is also ... "too low to produce much output from the ADC unless the received signal is very strong". per the manual. So they are not intended to be equal level signals. They are just being measured at two different?points in the circuit. My QCX Minis do the same thing as you are seeing. ....Some amount of reading on channel 1 and little to nothing on channel 2.?
73 ... Ron
This would be items 9.3 and 9.4 under the test equipment heading.
On Sun, Feb 19, 2023 at 7:45 AM Ronald Taylor < wa7gil@...> wrote: Hi Dave. There might be some confusion here. The QCX has an I and a Q channel that are combined together in the proper phase to eliminate one of the sidebands into a single audio channel, filtered, amplified and applied to the headphone jack. They feed a stereo jack but the single audio channel is applied to both the left and right outputs of that connector so the result using stereo headphones is a single channel applied to both ears. So I'm not sure what you are referring?to as channels 1 and 2... Can you be more specific as to where you are measuring level differences between two channels in the radio?
Thanks ... 73 ... Ron
The unit I was asking about is QCX +. I have both a 40 and a 20 meter and for both units the level for channel 2 is much lower, near 0. It seems that the noise level is higher than I would expect and possibly the pass band is not as sharp as it could be. I have tried two different head phones?and there is not much difference. I have tried several different power supplies, including a 9 volt battery. The antenna is a 71 foot long wire with a 9 to 1 transformer with about 50 feet of RG8x and a choke near the radio. The choke is 13 turns around a F240-31 core.? Thank You for your help
On Sat, Feb 18, 2023 at 11:26 PM Alan G4ZFQ < alan4alan@...> wrote: On 19/02/2023 03:09, Dave Morris wrote:
> what sort of levels should?I see for channels?1 and 2 ? Should they be
> about equal ?
Dave,
Probably.
But I see no reference to what audio channels on what gear.
73 Alan G4ZFQ
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Jim, when you?first power up the GPS it will be off about 18 seconds and will correct itself in some period of time .. .Several minutes in my case. There has been discussion of this on the group if you want to search on that topic.?
73 .. .Ron
On Sun, Feb 19, 2023 at 12:11 PM Jim Bennett / K7TXA via <w6jhb= [email protected]> wrote: Have an interesting situation with running my QLG2 GPS unit. I have it set up to run from USB power. For several hours I had it running with the USB plugged into a small, powered, four port USB hub. I got an f12 and t16, with s24. I noticed that even after several hours the time on the display was about one full second slower than that displayed on my Elecraft K4D. My K4D is on an ethernet connection and our home has fiber Internet service. When I run FT8 on the K4D, my time variance column is always in the +- 0.1 to +- 0.2 range, so I'm inclined to believe that the K4D is showing a correct time.
So, I moved the QLG2 to a different powered hub, this one with 12 ports. After having it connected there for a while, my display is showing f05 t07 and s17 - I have NOT moved the antenna. But the interesting thing is that the time on the GPS display is now a full 17 seconds ahead of that showing on the K4D. WTF?
Is it possible that the voltage presented to the ports on these USB hubs are whacky enough to cause the QLG2 to be so out of tune, so to speak? I would have thought that providing the QLG2 power through a USB connection would be more stable than trying to cobble together some sort of 5v power source for it. What are other users doing for QLG2 power?
--
Jim / K7TXA
Eagle, ID
SKCC 10447
BUG 301
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Have an interesting situation with running my QLG2 GPS unit. I have it set up to run from USB power. For several hours I had it running with the USB plugged into a small, powered, four port USB hub. I got an f12 and t16, with s24. I noticed that even after several hours the time on the display was about one full second slower than that displayed on my Elecraft K4D. My K4D is on an ethernet connection and our home has fiber Internet service. When I run FT8 on the K4D, my time variance column is always in the +- 0.1 to +- 0.2 range, so I'm inclined to believe that the K4D is showing a correct time.
So, I moved the QLG2 to a different powered hub, this one with 12 ports. After having it connected there for a while, my display is showing f05 t07 and s17 - I have NOT moved the antenna. But the interesting thing is that the time on the GPS display is now a full 17 seconds ahead of that showing on the K4D. WTF?
Is it possible that the voltage presented to the ports on these USB hubs are whacky enough to cause the QLG2 to be so out of tune, so to speak? I would have thought that providing the QLG2 power through a USB connection would be more stable than trying to cobble together some sort of 5v power source for it. What are other users doing for QLG2 power?
--
Jim / K7TXA
Eagle, ID
SKCC 10447
BUG 301
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Thank you Lloyd.?
--
Colin - K6JTH?
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That won't work since the next time you unplug and re-plug the
radio, it will return to root/dialout.
Do this instead: sudo usermod -a -G dialout <yourusername>
72
Lloyd VA7LAS
On 2023-02-19 10:01, Colin Kaminski
wrote:
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sudo chown :pi /dev/ttyACM0
swap?pi?with?your?user?name??
--
Colin - K6JTH?
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sudo chown :pi /dev/ttyACM0
swap?pi?with?your?user?name??
-- Colin - K6JTH?
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On Sonntag, 19. Februar 2023 13:47:19 -03 Roger G3REB wrote: /dev/ttyACM0:permission denied Is your user part of the dialout group? 73 de Eike -- Eike Lantzsch KY4PZ / ZP5CGE
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On Sun, Feb 19, 2023 at 07:44 AM, Al Holt wrote:
cut the leads, I guess using a fine pair of side cutters works.
I find that #15 scalpel blades do a great job of cutting device leads as well as PCB traces; press down and rock the blade.? Cut the leads adjacent to the package to help avoid damage to the PCB, then de-solder them individually.. #11 blades are more common but the tips break off easily.? Non-sterile blades are usually significantly cheaper. Buy a lot and toss them frequently; dispose of them responsibly.? While device leads are cuttable, they are still metal so they do dull the tools quickly.? Trying to get more mileage by forcing a dull blade is false economy, I have found. Of course hot air de-soldering is the best.... 73, Don N2VGU
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Hi Glenn,? Thanks for your reply. I've had another reply asking if I am a member of the dialout group but I'm not sure what that means. I did check if brtty is installed but it's not
The OS is Linux Mint 21 on both my laptop and desktop.
Roger, G3REB
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On 19/02/2023 15:38, ROBERT NELSON wrote: A COM port is not seen by the PC Robert, And probably no audio device? I would not expect that probing around the pin diodes would damage the micro but it looks as if that may have failed. What current does the QDX take? 73 Alan G4ZFQ
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David, thanks for your reply. I'm not sure what you mean by dialout group. How do I check?
Roger G3REB
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Cliff
Thanks for your reply. I can't? connect to Putty, when I try the response is - Unable to open connection to /dev/ttyACM0: and the next msg line - Opening serial port /dev/ttyACM0:permission denied.
Using the terminal? and typing in sudo dmesg ? I can see my QDX tranceiver and it tells me that it is a USB ACM device and the port is ttyACM0 , so I know it's there but not opening up to transfer info.
So I not much further on.
Roger, G3REB
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Re: So you need 4W out of your QDX QCX??
It does look fantastic Dean, and it is fantastic that the Gerber files, BOM and software are available.?
Unfortunately it appears that no one has made it available as a kit. ?I could order boards, minimum of five, accumulate all the parts, and have enough leftovers for several more.
It would be great is someone enterprising could make it available as a kit, licensed of course. Dave
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On Feb 19, 2023, at 07:12, Dean Smith <bardezbiker@...> wrote:
? /g/RadioStufflink for this wonderful piece of kit.. Does dBm also. 5 inch touchscreen :)) <IMG_0259.jpg>
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Rick Williams - VE7TK
Brent DeWitt
Ronald Taylor
Colin Kaminski
Donald S Brant Jr