Date   

Re: Slightly off topic. (2) 40 meter QCX's and (2) antennas to compare on the reverse beacon network?

Mike
 

Martin,
 I have switched back and forth thousands of times.

So yesterday I hooked up both QCX's to different antennas. One on 7.026 and the other on 7.020. I set a memory on both but, one signed /P. I pressed the "send" button at the same time. It worked well and the RBN showed both separately. I did try to key both with one paddle and that was a little cumbersome.

Mission accomplished.

Thanks 
Mike WA3O


Re: New QLG2 serial output

Alan G4ZFQ
 

Is the new QLG2 serial output a superset of the QLG1 serial output?
Tom,

No connection with your question but I have a few notes about the module here https://sites.google.com/site/g4zfqradio/incircuitprogramatmel168#h.tpm1l60t46z

73 Alan G4ZFQ


Re: New QLG2 serial output

Hans Summers
 

Hi Tom
 
Is the new QLG2 serial output a superset of the QLG1 serial output?

Yes, sort of... 

Certain NMEA sentences got renamed. For example the most important sentence is $GPRMC which contains date, time, location and fix status. Really, "GP" stands for "GPS", the US satellite system. 

In QLG1, the sentence is named $GPRMC
In QLG2, the sentence is named $GNRMC

See the difference... the second character is changed to N in recognition of the fact that this is really a GNSS receiver (Global Navigation Satellite System, the collection of all such satellite positioning systems) not GPS (Global Positioning System, the US satellite system). The RMC sentence data contains information derived from all the satellite systems that are being received. 

Similarly the $GPVTG sentence is renamed to $GNVTG.
 
I am guessing the same NMEA sentences are output, plus some new NMEA sentences beginning with $BD, and maybe beginning with other prefixes.

Yes, correct. Each satellite constellation has its own 2-character prefix; BD is for Beidou (the Chinese system), GP is for GPS (the US system). 

NMEA sentences which are specific to the satellite system, such as the list of satellites being received and their positions and SNR, have the 2-character prefix. 

In QLG1, we got sentences called $GPGSV and $GPGSA. 
In QLG2, we get multiple sentences e.g. $GPGSV, $BDGSV, $GPGSA, $BDGSV (In the GPS + Beidou example). 

GLONASS (Russia) and Galileo (Europe) also have their own 2-character prefixes which will appear in the serial data if the receiver is configured to receive these satellite systems.
 
How will existing QRPLabs products handle the new output.

All QRP Labs products from the last 6+ years, should work with QLG2 without any changes (no new firmware versions required). This is because the QRP Labs firmware GPS parser looks for NMEA sentences $xxRMC, $xxGSV etc., it does not care about the xx or check what it is. I originally did this because it made the code a bit more compact :-)  By dropping the "GP", I saved 2 bytes each time I stored a string to match the NMEA Sentence name against :-)    And now this change has come back to help me, happy days  :-) 

All current kits work, with all firmware versions (All firmware versions of QCX-series, Ultimate3S, VFO, Clock and ProgRock kits). As far as I can tell, No firmware change is needed, to correctly handle the QLG2 output. 

Older Ultimate-series kits have a problem. I went back and looked in my archives at all the old source code I could find, with the following result:
  • Ultimate: http://qrp-labs.com/qrsskitmm.html - all firmware versions will not work with QLG2 because it seeks sentence $GPRMC
  • Ultimate2: http://qrp-labs.com/ultimate2.html - all firmware versions will not work with QLG2 because it seeks sentence $GPRMC
  • Ultimate3: http://qrp-labs.com/ultimate3/u3.html - firmware 3.03 and below will definitely not work because it seeks sentence $GPRMC; firmware 3.06 and above will work because they are looking only for $xxRMC (don't care about x). I am not sure about 3.04 and 3.05 because I could not yet find where I hid the source code for those ;-)   The v3.09f firmware chip for Ultimate3 is already available in the QRP Labs shop or for download so anyone with a very old Ultimate3 firmware version could upgrade to make it compatible with QLG2 if they wish. 
If people want to use the antique Ultimate, Ultimate2 kits with QLG2, I could quite easily prepare a firmware update for those. It's a small code change only (famous last words, I know). 

So basically, unless you have an old Ultimate kit or Ultimate2 or Ultimate3 with early firmware, QLG2 will work fine for you. All current kits (Ultimate3S, VFO, Clock, QCX-series) work fine with QLG2 already. 

Regarding which satellite constellations are enabled... by default, the QLG2 GPS Receiver module E108 is set to receive GPS (US) and BDS Beidou (Chinese). There are jumper wires on the QLG2 board that will allow you to enable other systems GLONASS (Russian), Galileo (European) if you wish. Note that all are global systems, just run by different countries or country groups in the case of Europe. There is a limitation, which is that existing QRP Labs kits are set to 9600 baud serial data. If you switch on more than GPS and BDS then there is so much data that it no longer fits into one second when sent at 9600 baud. Therefore it is necessary to either:
  1. switch off some NMEA sentences, such as the satellite information sentence GSV which is the most verbose one; the side-effect of this is that the Ultimate3S can't show average SNR anymore.   - OR -
  2. Increase the baud rate, higher than 9600 baud - but this won't work with QRP Labs kits which are configured at 9600 baud. 
Whichever way you look at it, QLG2 http://qrp-labs.com/qlg2 offers a significant upgrade to the QLG1, because of the included active antenna providing even higher sensitivity, and because of the multi satellite configuration capacitability - which even in the default case (GPS and Beidou) results in much faster satellite acquisition for fix computation (time to first fix) because there are more satellites to choose from. 

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


New QLG2 serial output

Tom Rocheleau
 

Is the new QLG2 serial output a superset of the QLG1 serial output? I am guessing the same NMEA sentences are output, plus some new NMEA sentences beginning with $BD, and maybe beginning with other prefixes. How will existing QRPLabs products handle the new output.

The EBYTE documentation (GPS Module) does not really describe all the sentences the module will output.

-Tom WA8WPI


Re: 50W Amp--Anyone tried IRF520s?

MVS Sarma
 

Any simpler mods to conver it to ssb compatible? 


On Tue, 23 Mar 2021, 09:21 Brian N7BKV, <cl@...> wrote:
On Mon, Mar 22, 2021 at 06:52 PM, ajparent1/KB1GMX wrote:
>>  Try it and let us know...  Never had anyone do that. <<
I like that reply.  It goes along with my favorite:  Sure, go ahead.  Plug it in and see if it works!

But on the serious side, I appreciate the detailed explanation you took the time to write.

Brian N
N7BKV


Re: 50W Amp--Anyone tried IRF520s?

Brian N7BKV
 

On Mon, Mar 22, 2021 at 06:52 PM, ajparent1/KB1GMX wrote:
>>  Try it and let us know...  Never had anyone do that. <<
I like that reply.  It goes along with my favorite:  Sure, go ahead.  Plug it in and see if it works!

But on the serious side, I appreciate the detailed explanation you took the time to write.

Brian N
N7BKV


Re: 50W Amp--Anyone tried IRF520s?

ajparent1/KB1GMX
 

I'll fall to my favorite answer for things like this...
>>  Try it and let us know...  Never had anyone do that. <<

IRF520 is higher current device due to lower RDS on
(saturated switching not RF) the package (TO220 ) is power
limited based on the heat they can transfer to the heat sink.
The larger DIE has higher capacitance for input and output
so that alters circuit behaviour.  That said for 40M it may
still work about the same likely worse.  You will not get
more power as that is again not solely up to the transistor
and the output transformer determines loaded impedances
and hence power.  Also more power requires move drive. 
Over do it and smoke happens.

If you start changing thing willy nilly its all up to you and 
may induce failure.   Design of power amps looks like s trivial
circuit but everything is done for a reason and its all down to 
Small things that make a difference between a self destructing
power oscillator or an efficient amplifier.  With the hexfets
(IRF5xx) there are a large number of differing parts and most all
are higher input capacitance, output capacitance and importantly
the Drain to Gate gate capacitance.  That last parameter if higher
means less gain and if not allowed for oscillation.


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


Re: New box for dummyload

jakob@...
 

And you can call it a Gummyload!


Re: About T1 transformer

Pat
 

On Sun, Mar 21, 2021 at 07:21 AM, Jim Sheldon wrote:
I taught electronics for a number of years while I was in the American military
I got married while attending Aviation Electronics school at NAS Memphis years ago.  I walked into the lab and the instructors (civilian - former military) asked me if I had gotten married over the Christmas break.  They'd obviously spotted my brand new wedding ring, and I knew instantly I had messed up.  I think my punishment was to write a paper on safety in the lab and present to the current class.  The same instructor helped me fix an old Fuzz Buster radar detector by replacing something that was burned up, something that was well beyond my skills at the time.  


Re: Erratic Keying QCX Mini 40m (Rev. 2 board)

Jim Painter
 

 Good idea Curt.

Jim


On Mar 22, 2021, at 6:15 PM, wb8yyy via groups.io <wb8yyy@...> wrote:

Jim

Well if it works just setting it slightly slower, you have a solution. Each rig may provide a slightly different delay in the sidetone or keying rate, that messes with our brain. Take your time with adjustments. Oh yes paddles can be very different from each other, some take more force or a very light touch. If we get back to normal club field day, we'll invite the gang to bring different paddles out or maybe to a qrp outing.

Curt


Re: Erratic Keying QCX Mini 40m (Rev. 2 board)

Jim Painter
 

Thanks Dan. Did you try the HST in single paddle mode or side swiper (cootie)? I am looking at the Kent SP-1 and the Begali Simplex. From all reports, Cooties are terrible.

As far as the QCX problem, I have tried two different key/cable combinations on three radios. I have the same problem on the QCX and QCX+. Both keys seem fine on the ic-7300. Although I found my errors increase on the 7300 as I go above 15wpm. I had been running the paddles with a tight gap. I opened the gap up very wide and now able to go to 20wpm on the 7300 with no problems. Not true of the QCX’s.

What kind of key are you using on your QCX’s?

Thanks...Jim...KQ3S


On Mar 22, 2021, at 4:31 PM, Daniel Walter via groups.io <nm3a@...> wrote:

Jim,
Kent makes a great key. Begali makes an excellent key that's a work of art. N3ZN makes a great key too. On the single lever, consider trying one before you splurge. I tried Cookie's Begali HST. Nice key, but single lever is not for me. 
--
73, Dan  NM3A


Re: New box for dummyload

jakob@...
 

Ciao Giuseppe. Now it makes sense to me! I just misunderstood the wiring. 73 de Jakob aa0jr


Re: Erratic Keying QCX Mini 40m (Rev. 2 board)

Curt wb8yyy
 

Jim

Well if it works just setting it slightly slower, you have a solution. Each rig may provide a slightly different delay in the sidetone or keying rate, that messes with our brain. Take your time with adjustments. Oh yes paddles can be very different from each other, some take more force or a very light touch. If we get back to normal club field day, we'll invite the gang to bring different paddles out or maybe to a qrp outing.

Curt


Re: 50W Amp--Anyone tried IRF520s?

VE7VXO
 

I have not tried it but  remember some discussion about others trying this.  You might think the IRF520, 530 etc look attractive due to the higher power rating but this is for DC and low frequency use.  IIRC as it turns out the fabrication of these devices results in much higher gate and output capacitances which make them more difficult to drive and poorer performance for RF amplifiers.  That is not to say you can't make one work to some degree if that is all that you have on hand, but be prepared for the devil in the details.

Joe


Re: Erratic Keying QCX Mini 40m (Rev. 2 board)

Daniel Walter
 

Jim,
Kent makes a great key. Begali makes an excellent key that's a work of art. N3ZN makes a great key too. On the single lever, consider trying one before you splurge. I tried Cookie's Begali HST. Nice key, but single lever is not for me. 
--
73, Dan  NM3A


CAT KY command #cat #qcxmini #wspr

KEN G4APB
 

Hi Hans,,
further to my quest to get my 40m QCXmini to switch between Tx and Rx in WSPR mode, under wsjt-x control using the CAT commands; I have found that the 'KY XXXX' CW send command gets ignored if a QLG1 is plugged in at the time. I have been using this command to preset my auto ATU-100 as I band hop in Rx mode (and yes I can transmit and receive fine on 60m as well as 40m), but  I want to leave the QLG1 plugged in for the WPSR Tx timing,otherwise, clock timing degrades quite quickly.

I am not asking for anything to be done, apart from put it on your 'to consider' list along with any other pending updates.Maybe a facility to choose between GPS or morse key on that input as I does seem to foul things up if QLG1 is connected when not in beacon mode?

73 Ken G4APB


Re: New box for dummyload

GIUSEPPE
 

good evening Jakob, actually that.  he saw is the top photo of the dummy load with DVM test clamps for the te sion, i send you another photo .73 iu8eun


Il lun 22 mar 2021, 16:50 <jakob@...> ha scritto:
Nice idea! However, I would have used a BNC connector instead of the posts and used short straight wires to connect the dummy load. Your setup will work reasonably well for the lower bands, but introduce too much stray inductivity in the upper bands. If you could use a Nano-VNC you would see the difference. 73 AA0JR Jakob


Re: Slightly off topic. (2) 40 meter QCX's and (2) antennas to compare on the reverse beacon network?

Martin DK3UW
 

Mike,

have you switched antennas while receiving ? That could give some indication already.
On transmission I also noted not only differences in signal strength but also some beacons did come up with one antenna and not with the other. I was comparing a dipole to a Delta Loop. For me in most cases the Dipole was better so I took down the Delta Loop.


50W Amp--Anyone tried IRF520s?

Brian N7BKV
 

I was buying a supply of IRF510 transistors for Q1 and Q2 replacements.  They are rated at 43 watts.  Has anyone tried the IRF520?  They are rated at 60 watts.
What else would need changing in the circuit and what will happen?  Hopefully not smoke!

Brian N
N7BKV


Re: About T1 transformer

Brian N7BKV
 

On Sun, Mar 21, 2021 at 05:59 AM, @CurtisM wrote:
No harm in inquiry. T1 is a key to this receiver circuit, it enables single signal reception when the circuitry is aligned. It must be assembled properly. Do study the nice pictures. 
And....T1 is actually a rather cleaver and elegant component.  Quite rewarding to build and to understand what it does!

Winding toroids--like knitting, but for men !