Date   

Clock Display

Kevin Luxford
 

I am very sorry to have to ask the following question. A couple of links to further information within the operation / assembly manuals are broken, and a search has not turned up the information I need. I have built the clock. It uses a qlg1 GPS receiver to provide satellite data to the clock. It works. However, the display, which is a 20 x 4, will display 4 lines of output, but only up to 16 characters per line. How do I tell the clock that it has a 20 x 4 LCD?

And congratulations to Hans and his family on the arrival of the 2nd harmonic.
73, Kevin VK3DAP / ZL2DAP

--
Kevin B. G. Luxford
kbgluxford@...


--
Kevington


Re: QLG1 GPS - No TXD

Armin, DJ2AG
 

 Hello Mike,
 
the yellow (TxD) LED should start blinking after power is applied.
 
Armin, DJ2AG


QLG1 GPS - No TXD

Mike Besemer - WM4B
 

Greetings all,

Working on a QLG1 for another gentleman and would like the opinion of others.

Initial symptoms were that the Power, TXD, and PPS LED all remained on at all times.  I received the board in the mail today and went straight to work on it.

A quick check with a scope revealed that there was no TXD or PPS output from the GPS RF Module.  I then proceeded to touch up all the solder joints, followed by a good cleaning with brake cleaner and a toothbrush.  This resulted in no change (as expected).

Based on measurements taken by the other gentleman – and my gut – I then proceeded to remove and replace IC1.  (I actually replaced it with a socket, to facilitate further troubleshooting.)

With the IC removed from the socket, I still had no TXD or PPS signal and began to suspect the RF Module, but a quick continuity check between the Patch Antenna and Pin 11 of the RF Module revealed a questionable connection, so I sucked that joint clean, scrubbed it, and resoldered.  A minute or so after reapplying power, I started to get a good PPS signal, but no TXD.  With IC1 installed, I get a flashing PPS LED and no TXD LED.  (Power LED is fine.)

If I remember correctly, the PPS signal should not be present until the constellation data has been downloaded and TXD is available and being sent, so I have to *ASSUME* that the RF Module is working insomuch as it has the ability to receive and decode GPS data.  That being said, it is still *NOT* producing TXD.

So the question is:  Is the Rf Module toast, or is it a firmware issue?  I tend to think the module is toast, but I’m not that experienced with chips that contain firmware.  I *COULD* drag out an rPi and monitor, download the image, and attempt to reflash the module, but before I go through all that thrash, I’d like to hear from others who may have been down this road. 

I’m aware that there is a pin-for-pin compatible replacement for the YIC, but IIRC, it costs more than the entire GPS.  I have the ability to replace the YIC, but I don’t know if it could be sourced from Hans or if that would be cost effective. 

Ideas?

Mike

WM4B


Re: Change Request.

Mike Besemer - WM4B
 

One way to use it to label a front panel would be to make a vinyl covering for the entire panel, cutting out the labels and holes for controls.”

 

That was my method, but I only cut out the lettering for the labels.  The holes were formed with the tip of a hot soldering iron.

 

Mike

WM4B

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Shirley Dulcey KE1L
Sent: Tuesday, July 7, 2020 7:08 PM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] Change Request.

 

It's a computer-controlled cutting device. The fancy model will cut a large variety of soft materials, including basswood and leather. Not metal, though.

 

One way to use it to label a front panel would be to make a vinyl covering for the entire panel, cutting out the labels and holes for controls.

 

It's also possible to put in a marker rather than a cutting tool. It might be possible to label a front panel by using the market to write on it. I make no promises about how well or badly that would work; the markers might not be designed to stick well to front panel materials.

 

On Tue, Jul 7, 2020 at 6:58 PM N3MNT <bob@...> wrote:

It is a hobby vinyl cutter.


Re: Change Request.

Shirley Dulcey KE1L
 

It's a computer-controlled cutting device. The fancy model will cut a large variety of soft materials, including basswood and leather. Not metal, though.

One way to use it to label a front panel would be to make a vinyl covering for the entire panel, cutting out the labels and holes for controls.

It's also possible to put in a marker rather than a cutting tool. It might be possible to label a front panel by using the market to write on it. I make no promises about how well or badly that would work; the markers might not be designed to stick well to front panel materials.

On Tue, Jul 7, 2020 at 6:58 PM N3MNT <bob@...> wrote:
It is a hobby vinyl cutter.


Re: Change Request.

Mike Besemer - WM4B
 

Hi Ted,

 

No… a Cricut machine is a toy for (mostly) the XYLs.  It cuts paper, vinyl, etc. and produces some really intricate patterns.  I still need to re-cut my the overlay for my front panel… the XYL has been using (her) toy and won’t let me in!

 

73,

 

Mike

WM4B

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Ted 2E0THH
Sent: Tuesday, July 7, 2020 6:45 PM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] Change Request.

 

Mike
I've been needing to get around to mine for 2 years - what on earth is a cricut machine and will it work on black anodised aluminium?
73s Ted
2E0THH


Re: Change Request.

N3MNT
 

It is a hobby vinyl cutter.


Re: Change Request.

Ted 2E0THH
 

Mike
I've been needing to get around to mine for 2 years - what on earth is a cricut machine and will it work on black anodised aluminium?
73s Ted
2E0THH


Re: Horizontal lines after power up

Jim Netwal
 

I am now convinced that I have a bad screen.  I took the screen from the QCX 40 and put it on the QCX 20 and it seems to be working fine.  I was able to do the alingment on the radio and I am receiving signals.  It's been on for more than an hour now and it's working fine.  So now the questions is where can I order a new screen from here in the US?

Thank you!
Jim W9UUM


Re: BPF too good? #filter

Dave
 

Toroids are self shielding, as almost all the magnetic flux is enclosed in the toroid.  There may be some capacitive linkage to the nearby metal, but it would be very minimal.

Dave


On Tue, Jul 7, 2020 at 4:48 PM Jim Painter via groups.io <Jfpainter=yahoo.com@groups.io> wrote:
It looks like your test jig has two large metal brackets which are very close to the coils. Could they be screwing with the inductance? 


Jim...kq3s



On Tue, Jul 7, 2020 at 9:02 AM, Bob Benedict, KD8CGH
<rkayakr@...> wrote:
I built a 20 m BPF. Since I have many to make, I made a holder with SMA connectors and decided to use my recently acquired  NanoVNA for the first time with a filter. Filter analysis shows a center at 14.09 MHz and a 3 db BW of 1.39 MHz, which seems fine. Neither variable cap is at its extreme.
My concern is that the loss looks too low. I'm seeing 0.4 dB S21 loss. The VSWR is also 2. After calibration check with straight through wires scan reads VSWR 1.03, return loss -35 dB and S21 gain -.077 dB.




--
  73
    KD8CGH


Re: For Sale: QRP Tuner

rtharp0001@...
 

The tuner has sold. 

73
Robert

On Tue, Jul 7, 2020 at 2:23 PM rtharp0001 via groups.io <rtharp0001=gmail.com@groups.io> wrote:
Emtech ZM-2  QRP Z-match Tuner with BNC connectors, like new condition. Maximum power is 15 watts. Perfect match for QCX or QSX.  Contact direct at rtharp0001@... for pictures or more information.  $80 with free shipping to CONUS, PayPal only. 


Re: BPF too good? #filter

Jim Painter
 

It looks like your test jig has two large metal brackets which are very close to the coils. Could they be screwing with the inductance? 


Jim...kq3s



On Tue, Jul 7, 2020 at 9:02 AM, Bob Benedict, KD8CGH
<rkayakr@...> wrote:
I built a 20 m BPF. Since I have many to make, I made a holder with SMA connectors and decided to use my recently acquired  NanoVNA for the first time with a filter. Filter analysis shows a center at 14.09 MHz and a 3 db BW of 1.39 MHz, which seems fine. Neither variable cap is at its extreme.
My concern is that the loss looks too low. I'm seeing 0.4 dB S21 loss. The VSWR is also 2. After calibration check with straight through wires scan reads VSWR 1.03, return loss -35 dB and S21 gain -.077 dB.




--
  73
    KD8CGH


Re: QCX+ order date.

Ron W3ZV
 

Got what I needed. Thanks

Ron W3ZV

On July 7, 2020 at 16:17:17, Ron W3ZV via groups.io (w3zv.radio@...) wrote:

Would some kind person who received their QCX+ within the last couple of days provide their order date to me (by direct email) so I can get a rough idea of where I stand on the list.. Thanks

Ron W3ZV
w3zv.radio@...
 

--
Ron W3ZV

--
Ron W3ZV


QCX+ order date.

Ron W3ZV
 

Would some kind person who received their QCX+ within the last couple of days provide their order date to me (by direct email) so I can get a rough idea of where I stand on the list.. Thanks

Ron W3ZV
w3zv.radio@...
 

--
Ron W3ZV


For Sale: QRP Tuner

rtharp0001@...
 

Emtech ZM-2  QRP Z-match Tuner with BNC connectors, like new condition. Maximum power is 15 watts. Perfect match for QCX or QSX.  Contact direct at rtharp0001@... for pictures or more information.  $80 with free shipping to CONUS, PayPal only. 


Re: BPF too good? #filter

Bob Benedict, KD8CGH
 

I suspected the cal also. When I repeated a sweep with the wires I used for "through" I got what I listed above - almost perfect cal for 10 MHz to 30 MHz:
VSWR 1.03, return loss -35 dB and S21 gain -.077 dB.
As stated in OP - this is my first try at measuring a filter with the NanoVNA, I would not be surprised to find a measurement error obvious to others well versed.
--
  73
    KD8CGH


Re: BPF too good? #filter

ajparent1/KB1GMX
 

I'd be suspect of the cal.   If the cables and jig called at 20M the loss should
be zero and the SWR  also perfect (cal absorbs errors).

The S11 should be a good match inside the pass band, its a symmetrical
filter.

For S21 its too good.  I can imagine and model a better filter loss but
only with perfect caps and coils.  See ELSIE.

1.25Db is best I could ever do for double tuned and that was with
3/8th" ceramic slug tuned inductor ( with enough turns to keep
core barely inserted) with silver mica caps critically coupled.

That was verified with both VNA (agilent 8573) NanoVNA, and
S11/S21 setup on Rigol DSA815T.  I tend to do that want I get
numbers close to the book.  I have found the NanoVNA I have
to be a bit more optimistic at HF by variable amounts but under
.1db (good enough).

Allison
-------------------------------
Please reply on list so we can share.
No private email, it goes to a bit bucket due address harvesting


Re: 40 Meter QCX Si5351 Error

Ronald Taylor
 

Paul, check that you got the orientation of the two diodes D1 and D2 correct and look for about 3.5 or so volts on the cathode of D1. If that is good, check your connections at R3 and R4 as well as pins 27 and 28 of the microcontroller. If they look good, check continuity (with power off) between pin 28 and R4. hold one meter lead on pin 28 and move the other to each side of R4. You should see 1K ohm on one lead and zero ohms on the other. Likewise do the same between pin 27 and R3. These connections are the I2C communication buss between the microcontroller and the Si5351a. 

Report back on what you find ... 73 ... Ron

On Tue, Jul 7, 2020 at 8:07 AM K2DB Paul Mackanos <paul.mackanos@...> wrote:
I had a bad intermittent power connection, i moved the QCX and the power went on and off several times due to the loose connector.
Now all I get is the start up screen then it goes to Si 5351 Error.
Have no idea where to start.
Paul K2DB


Re: BPF too good? #filter

Dave
 

I would have to guess who LeBron James is and know well who David Beckham is. And Victoria too. :-)

Dave


On Jul 7, 2020, at 11:51, Bob Benedict, KD8CGH <rkayakr@...> wrote:

Thanks for the vote of confidence. What gives me pause is that the docs list the insertion loss as 1.75 dB. While it is not impossible that I built one of Hans's filters with a lower loss than he did, I think the probability is about like that of me outplaying LeBron James in basketball (or like outplaying Beckham in football for those of you in the rest of the world).
--
  73
    KD8CGH


Re: BPF too good? #filter

Bob Benedict, KD8CGH
 

Thanks for the vote of confidence. What gives me pause is that the docs list the insertion loss as 1.75 dB. While it is not impossible that I built one of Hans's filters with a lower loss than he did, I think the probability is about like that of me outplaying LeBron James in basketball (or like outplaying Beckham in football for those of you in the rest of the world).
--
  73
    KD8CGH