Date   

Complete Circuit Diagram U3S

Andrew Lenton
 

Can someone point me to the full circuit diagram of the U3S, I want to study the relay connections, D1, W0,1,2,3 and 4. The Diagram on page two of the instructions stops at C5, I need to see where this goes and how it is switched.

73

Andrew


Re: QSO on first attempt with new QCX 5 watter!

David Perry
 

Excellent news. Well done.

David

On 18 Oct 2017 5:24 pm, "Julian Forsey" <julian_forsey@...> wrote:
Hello All.
I finished my 40 metre version of the QCX 5 watt trx this morning, it worked first time and aligned easily, so I connected it to my low inverted vee dipole antenna and replied to a CQ on 7030. Result! a 559 report and a nice chat with a fellow Brit. So I gave a shout to a station in the Netherlands, and back he came with 549 and another nice chat. Running on 12 volts so I guess about 3.5 watts.
What a brilliant day, and what a wonderful little Trx!
The performance of the receiver is shockingly good, and the Tx has so many features.
Fabulous value, I'm sure these little rigs will become legendary.
Good luck to everyone in the process of making theirs, I really enjoyed the build.
73s
Julian, G4ETS.


QSO on first attempt with new QCX 5 watter!

Julian Forsey
 

Hello All.
I finished my 40 metre version of the QCX 5 watt trx this morning, it worked first time and aligned easily, so I connected it to my low inverted vee dipole antenna and replied to a CQ on 7030. Result! a 559 report and a nice chat with a fellow Brit. So I gave a shout to a station in the Netherlands, and back he came with 549 and another nice chat. Running on 12 volts so I guess about 3.5 watts.
What a brilliant day, and what a wonderful little Trx!
The performance of the receiver is shockingly good, and the Tx has so many features.
Fabulous value, I'm sure these little rigs will become legendary.
Good luck to everyone in the process of making theirs, I really enjoyed the build.
73s
Julian, G4ETS.


Precision of 10 Mhz GPS corrected synthesizer.

josephlevy
 

Hello Hans

When checking the GPS synchronized Synth. I arrive at a frequency that is abt 1 or 2 Hz LOWER than a GPSDO ,(at 10 Mhz)

(that after setting the 'window' of correction to 1 and waiting a day for stabilization).

Can you please verify... (may be a software error or my measurement method).

TIA        de Joe 4Z7JBA


Re: 5 watt amp kit - no output

Al Holt
 

Have you tried the zero bias adjustment on the 5W PA board? For this adjustment there's no need for a signal (RF) from the U3S; you're just measuring a slight increase in current drawn by the module. If there's no bias voltage supplied to the IRF510 I believe you won't see any signal output. Good luck!

--Al


Re: QCX firmware version 1.00c release

Petr Ourednik
 

Hans,
many thanks for new f/w release! Great support as always...
73 - Petr, OK1RP
--
B: http://goo.gl/Fd2JhJ
G+: http://goo.gl/w3u2s9
G+: http://goo.gl/gP99xq


Re: 5 watt amp kit - no output ( UPDATE )

Vernon Matheson
 

 
Hi guys,
 
Just to let you know that the reason there is no output is that I have the incorrect version firmware in my U3S.
 
I was planning on building the simplified kit so didn't order the version 3.12c at the time. However in my eagerness to solder I built the full kit totally forgetting about needing the updated version.
 
My apologies to the list for the post and thank everyone that gave me advice.
 
Every day is a learning experience for the ole guy.
 
You still may hear back from me once I get the new firmware so your all not off the hook yet LOL!!!
 
73
 
Vernon - VE1VDM / VA1VM
 
 


QCX firmware version 1.00c release

Hans Summers
 

Hi all

I released firmware version 1.00c containing three bug fixes (which may or may not be considered minor, depending on your use of the kit). As usual, if you wish to upgrade the firmware you can download the .hex file from the folder https://groups.io/g/QRPLabs/files/Firmware%20for%20QCX%20kit/1.00c or you may find the programmed chip in the QRP Labs shop at http://shop.qrp-labs.com/firmware/qcxchip

The changes are:

- Bug fix: auto-character spacing feature did not work properly after version 1.00b
- Bug fix: display showed VFO frequency not WSPR transmit frequency, after a GPS calibration
- Bug fix: WSPR did not transmit reliably in every slot, sometimes it did, sometimes not

73 Hans G0UPL


Re: How can i see the raw data from the GPS receiver.

James Anderson
 

Hello Bern. 

I'll look into that too. So much good info. 

The visualgps is very similar in format to the software that I used to have some years ago. It showed up how many sats were connected and the data used to stream through in the display. For the life of me though, I can't remember how I did it but with all the answers I'm getting, the weekends looking very promising. Assuming the YL hasn't got other plans Hi

Thank you. 

On 18 Oct 2017, at 08:00, James Anderson <james21170@...> wrote:

Good morning Alan, Arv and Kieth. 

It's all excellent information and thank you for answering my question. 

All being well I should find time this weekend to put something together. 

I think I've got a few spare bits and pieces to be able to achieve some results. 

The arduino comes to the rescue again. I'll certainly look at that option too. 

Kind regards, James. 

On 17 Oct 2017, at 22:56, Arv Evans <arvid.evans@...> wrote:


On Tue, Oct 17, 2017 at 3:47 PM, Keith VE7GDH <ve7gdh@...> wrote:
James 2E0MUA wrote...

> Is there a piece of software that will interpret
> and show on the laptop the raw data string of the
> GPS data from the GPS module?

I'm still waiting for a couple of GPS receivers from
QRP Labs, but as others mentioned, you may need to
convert TTL to RS-232. Other than that, you could
just feed it into a terminal program and view the
NMEA strings that it is spitting out. If you want
something a bit fancier, take a look at...

http://www.visualgps.net/

--
73 Keith VE7GDH





Re: 5 watt amp kit - no output

Andrew Lenton
 

Hi When you are saying you are getting the 12V dc, I resume you mean on the 5 Watt amp only, are your powering the U3S from a separate 5V supply. Re check to see if you are getting your 250mW.

 

Also on the settings you must set PPT delay and TX shaping.

 

73

 

Andrew

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Vernon Matheson
Sent: 18 October 2017 01:47
To: QRPLabs@groups.io
Subject: [QRPLabs] 5 watt amp kit - no output

 

Hi all,

I just completed the 5 watt amp kit and fired it up...glad to report no smoke but also no output.

Turning the bias wide open did not do anything...I set the U3S at around 250mW before removing C5 so it was ok.

Also when turning up the bias the BS170 did not heat up when on TX.

I am not a skilled tecky guy but like to build and only have a DVM for trouble shooting.

I re-checked everything as far as the connect to the U3S goes and all is what the manual shows and it is getting the 12vdc no problem.

Could it be the trifilar coil..maybe I screwed that up :-)

Any ideas would be appreciated.

Thanks..

Vernon - VE1VDM / VA1VM


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Re: How can i see the raw data from the GPS receiver.

Bern Ghis <on7an.bernard@...>
 

Hi james,
With my GPS Bluetooth gt368 ,
I use on my laptop GPS nmea monitor ver2.07. From k. Kawano.
This software very use full 
And possibility clock synchronization. 
Vry 73
Bernard On7an 
Envoyé de mon iPhone 👍

Le 17 oct. 2017 à 21:55, James Anderson <james21170@...> a écrit :

Hello to all.

Is there a piece of software that will interpret and show on the laptop the raw data string of the GPS data from the GPS module.?

If so, how is it done.

My question comes from using an old BT77 gps bluetooth module from way back in time and i seem to remember being able to see the raw data strings as they were received on a PC.

For the life of me though, I'm unable to remember how i did it..

Kind regards, James.


Re: QRP Labs and Foundation licensees in the UK?

Chris Wilson
 

Hello David,

As the Tremeloes sang in the sixties, Silence is Golden :)



Tuesday, October 17, 2017

Shhhhhh





--

2E0ILY
Best regards,
Chris mailto:chris@...
--
Best regards, Chris Wilson (2E0ILY)


Re: How can i see the raw data from the GPS receiver.

James Anderson
 

Good morning Alan, Arv and Kieth. 

It's all excellent information and thank you for answering my question. 

All being well I should find time this weekend to put something together. 

I think I've got a few spare bits and pieces to be able to achieve some results. 

The arduino comes to the rescue again. I'll certainly look at that option too. 

Kind regards, James. 

On 17 Oct 2017, at 22:56, Arv Evans <arvid.evans@...> wrote:


On Tue, Oct 17, 2017 at 3:47 PM, Keith VE7GDH <ve7gdh@...> wrote:
James 2E0MUA wrote...

> Is there a piece of software that will interpret
> and show on the laptop the raw data string of the
> GPS data from the GPS module?

I'm still waiting for a couple of GPS receivers from
QRP Labs, but as others mentioned, you may need to
convert TTL to RS-232. Other than that, you could
just feed it into a terminal program and view the
NMEA strings that it is spitting out. If you want
something a bit fancier, take a look at...

http://www.visualgps.net/

--
73 Keith VE7GDH





Re: QRP Labs and Foundation licensees in the UK?

John Rabson
 

Keith,

Get your RSGB local rep to ask the Society to make informal soundings. Don't ask Ofcom "may we?" as this may result in a negative reply which has to be recorded.

I believe the RSGB has on occasion used the approach "if we asked a question such as [...] , what might your answer be?". This has been known to get a response like "we can't do that but if you were to ask [...] we might be able to do something for you."

John F5VLF/G3PAI

On 10/17/2017 08:50 PM, Keith, G6NHU wrote:

Here’s an interesting question.

Are UK Foundation licence holders allowed to build QRP Labs kits?  

Ofcom guidelines state:

"Holders of the Foundation Licence have demonstrated only limited technical competence and so pose a greater risk of causing harmful interference (even if inadvertently) if they construct their own apparatus. We therefore restrict holders of the Foundation Licence to apparatus that conforms to Interface Requirement IR 2028(35) or is assembled from kits, which conform to IR 2028. We believe that if apparatus conforms to IR2028 it should be possible to demonstrate its conformity with the essential requirements of the RED. Through IR 2028, we therefore manage the risk of inadvertent harmful interference.”



73 Keith G6NHU




Re: How can i see the raw data from the GPS receiver.

Alan G4ZFQ
 

I actually have a few of these in the bits and pieces draw that i bought some time ago for another project..
James.

Yes, since someone showed me these cheap TTL/USB/COM converters that's all I've used for playing with the GPS data.

Although you can feed a GPS into a real RS232 COM port it often is the wrong polarity and requires inversion. (All RS232 ports I've ever tried accept even 3V3 TTL RXD.)
As someone says do NOT send TXD from a real COM port to the GPS although that can be simply done using a resistor/zener to convert to TTL.

This page shows the UART connections https://sites.google.com/site/g4zfqradio/u-blox_neo-6-7 and also an interesting GPS, the NEO-7 has a configurable 0.25Hz to about 15MHz GPS referenced generator suitable for providing a reference signal for checking a receiver.

73 Alan G4ZFQ


Re: 5 watt amp kit - no output

William Martin
 

Vernon,

Check the triflar coil for correct winding and phasing.  If the phasing is wrong it will not work.

Check continuity of all coils.  Sometimes the enamel does not come off and you have a cold solder joint.  If you have a VOM with the amplifier off and unplugged check the DC continuity of all the coils.

Even with the bias low and drive low you should have some output.  You are using a dummy load I hope.........

Bill N7EU


5 watt amp kit - no output

Vernon Matheson
 

Hi all,

I just completed the 5 watt amp kit and fired it up...glad to report no smoke but also no output.

Turning the bias wide open did not do anything...I set the U3S at around 250mW before removing C5 so it was ok.

Also when turning up the bias the BS170 did not heat up when on TX.

I am not a skilled tecky guy but like to build and only have a DVM for trouble shooting.

I re-checked everything as far as the connect to the U3S goes and all is what the manual shows and it is getting the 12vdc no problem.

Could it be the trifilar coil..maybe I screwed that up :-)

Any ideas would be appreciated.

Thanks..

Vernon - VE1VDM / VA1VM


Re: How can i see the raw data from the GPS receiver.

Arv Evans <arvid.evans@...>
 

On Tue, Oct 17, 2017 at 3:47 PM, Keith VE7GDH <ve7gdh@...> wrote:
James 2E0MUA wrote...

> Is there a piece of software that will interpret
> and show on the laptop the raw data string of the
> GPS data from the GPS module?

I'm still waiting for a couple of GPS receivers from
QRP Labs, but as others mentioned, you may need to
convert TTL to RS-232. Other than that, you could
just feed it into a terminal program and view the
NMEA strings that it is spitting out. If you want
something a bit fancier, take a look at...

http://www.visualgps.net/

--
73 Keith VE7GDH





Re: How can i see the raw data from the GPS receiver.

Keith VE7GDH
 

James 2E0MUA wrote...

Is there a piece of software that will interpret
and show on the laptop the raw data string of the
GPS data from the GPS module?
I'm still waiting for a couple of GPS receivers from
QRP Labs, but as others mentioned, you may need to
convert TTL to RS-232. Other than that, you could
just feed it into a terminal program and view the
NMEA strings that it is spitting out. If you want
something a bit fancier, take a look at...

http://www.visualgps.net/

--
73 Keith VE7GDH


Re: How can i see the raw data from the GPS receiver.

Arv Evans <arvid.evans@...>
 

James

Data from most GPS units is in the NEMA format.  This is ASCII Text data
strings.  because GPS receivers run on either 5V or 3.3V you will need a '
level converter so that the 12V RS-232 data from your laptop will not damage
the GPS receiver.  Set the baud rate to the same on both laptop and GPS
receiver and open a Terminal Emulator application on the laptop.  Configure
the terminal emulator to use the serial port that is connected to your GPS
receiver.   You can select which data streams are output by sending
commands to the GPS receiver.  You should see lines of text streaming by
at 1 second intervals.

$GPRMC,225446,A,4916.45,N,12311.12,W,000.5,054.7,191194,020.3,E*
Where the data string breaks down to:
           225446       Time of fix 22:54:46 UTC
           A            Navigation receiver warning A = OK, V = warning
           4916.45,N    Latitude 49 deg. 16.45 min North
           12311.12,W   Longitude 123 deg. 11.12 min West
           000.5        Speed over ground, Knots
           054.7        Course Made Good, True
           191194       Date of fix  19 November 1994
           020.3,E      Magnetic variation 20.3 deg East
           *68          mandatory checksum
Other NEMA strings contain different data.

http://aprs.gids.nl/nmea/

Arv  K7HKL
_._


On Tue, Oct 17, 2017 at 1:55 PM, James Anderson <james21170@...> wrote:
Hello to all.

Is there a piece of software that will interpret and show on the laptop the raw data string of the GPS data from the GPS module.?

If so, how is it done.

My question comes from using an old BT77 gps bluetooth module from way back in time and i seem to remember being able to see the raw data strings as they were received on a PC.

For the life of me though, I'm unable to remember how i did it..

Kind regards, James.