Date   
Re: Beware Buck converters

f1mqj
 

Hi,
You can find a "mystery transistor tip" to avoid increasing voltage when default on the trim pot
in this video at about 2min : https://www.youtube.com/watch?v=eqNmZrpukWg yes the video is in french, but we are able to listen a lot of english ones ;-) and schematics are the same ...
in fact it is made for LM317 but the concept could probably be adapted for buck converters

Thanks to "Cyrob" (philippe Demerliac) for this schematic analysis

73 - Remi
--
FR4SW - F1MQJ - QCX 20m - not yet used

Re: Cat Control APP for QCX

Alan G4ZFQ
 

* Ultimate3S QRSS/WSPR kit ?
JT 9 ?
George,

The U3 has JT9 which can be used as a beacon but not in QSO mode.
(Unless you develop a method to rapidly change the EEPROM contents.)

73 Alan G4ZFQ

Re: Cat Control APP for QCX

George Korper
 

Would you recommend I purchase the
  • Ultimate3S QRSS/WSPR kit ?
    JT 9 ?

Re: Cat Control APP for QCX

George Korper
 

But I do get your point and I wonder if one of Han;s other kits does FT 8 mow, and I was so obsessed with
the QCX I overlooked it. Tell me because I have an order pending I can add to it !!

On Thu, Jan 2, 2020 at 10:10 AM George Korper via Groups.Io <georgekorper=gmail.com@groups.io> wrote:
After i kept reading your email it started to look like a  YES. -.--. /. / ...

On Thu, Jan 2, 2020 at 9:55 AM Alan G4ZFQ <alan4alan@...> wrote:
> I believe the QCX was modified for WSPR receive

George,

It is easy to bypass the CW filter for SSB receive. The audio can be
sent to any digimode program.
TX is another matter..

73 Alan G4ZFQ



Re: Cat Control APP for QCX

George Korper
 

After i kept reading your email it started to look like a  YES. -.--. /. / ...


On Thu, Jan 2, 2020 at 9:55 AM Alan G4ZFQ <alan4alan@...> wrote:
> I believe the QCX was modified for WSPR receive

George,

It is easy to bypass the CW filter for SSB receive. The audio can be
sent to any digimode program.
TX is another matter..

73 Alan G4ZFQ



Re: Cat Control APP for QCX

Alan G4ZFQ
 

I believe the QCX was modified for WSPR receive
George,

It is easy to bypass the CW filter for SSB receive. The audio can be sent to any digimode program.
TX is another matter..

73 Alan G4ZFQ

Re: Cat Control APP for QCX

George Korper
 

I believe the QCX was modified for WSPR receive and I am guessing someone has
looked into this. Someone, anyone? 

Re: Cat Control APP for QCX

geoff M0ORE
 

Can the QCX do FT8 just because of the CAT control????

On 02/01/2020 14:25, George Korper wrote:
It is a splendid New Year. I am very happy with my remote dial. 
My question is: ANYONE RUNNING FT8 ? I would very much to try that now that my antenna, 
and radio are doing well on CW. Never done FT 8 because the QCX had no CAT but now Hans has
done that and would like to contact other QCX users on FT8 or something similar we invent using Morse code 
and Weak Signal Detection. 

Re: Cat Control APP for QCX

George Korper
 

It is a splendid New Year. I am very happy with my remote dial. 
My question is: ANYONE RUNNING FT8 ? I would very much to try that now that my antenna, 
and radio are doing well on CW. Never done FT 8 because the QCX had no CAT but now Hans has
done that and would like to contact other QCX users on FT8 or something similar we invent using Morse code 
and Weak Signal Detection. 

Re: 80 Meter WSPR Freq?

James Anderson
 

I’ve always used this chaps site as a reference which simplified how to input the frequency into the U3S. 

 

https://g6nhu.co.uk/frequencies.html


Regards and a happy new year to all. 

Re: 80 Meter WSPR Freq?

Hans Summers
 

Hi Andy, all

The frequency listed in the Ultimate3S v3.12a operating manual is 3.567000 to 3.567200 which is wrong anyway - not just by a dial frequency offset... 

I have amended it to 3.570000 to 3.570200

Thanks for pointing this out

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

On Thu, Jan 2, 2020 at 2:23 AM Andy Brilleaux via Groups.Io <punkbiscuit=googlemail.com@groups.io> wrote:
On Wed, Jan 1, 2020 at 11:03 PM, K2DB Paul Mackanos wrote:
And it is wrong , the operation manual needs to be updated
You're right.
I suspect Hans will have it amended it within the next 24 hours.
It also begs the question, why does wsprnet.org not list the freqs as real freqs, as opposed to only dial ones ?

Non WSPR software use, such as stand alone beacons have existed since at least 2012.

That's 8 years of about 10/11 year of WSPR's own existence.

More wsprnet.org arrogance.

73 de Andy

Re: 50W amp T2 continuity check

Paul AI4EE
 

Oops! (red face). It is the bifiliar winding we are working with, not the trifilar.

Following the instructions, soldering in both of the black leads from the T2 toroid does indeed connect Q2's drain to C7. The next step is to solder in ONE END of the non-black winding. Refer to the schematic (T3 will not be installed yet) and you will see that there is no path from Q1's drain to C7. When you solder in the other end of the non-black winding, Q1's drain will finally be connected to C7.

This explains why the two paragraphs about Q1 and C7 seem contradictory.

Now I can get some sleep. 73!


On 1/1/2020 4:35 PM, Dennis Shelton wrote:

I suspect that the manual is correct, looked at from the top side. We are soldering in a trifilar winding ONE WINDING AT A TIME. After the first connection, that winding should connect Q2 to C7 right side. The next winding DOES NOT connect Q1 to C7, but when the third winding is soldered in and the circuit is complete, Q1 will then be connected to C7. The test in the second step is to make sure that the wiring is not transposed.

To test this theory, you could disconnect the third winding and see if the Q1-C7 path opens up.


On 1/1/2020 3:08 PM, Jon Reck W8REA wrote:
So, is this section of the manual incorrect?

Second paragraph from the end of section 3.6, page 17:
"Check for NO continuity with the DVM, from the middle pin of transistor Q1, to the right hand side of capacitor
C7. You should NOT see any continuity here."

- Jon W8REA

Re: 50 Watt Amp current limited supply

George Korper
 

Well  thank you Allison. 😇


On Wed, Jan 1, 2020, 6:19 PM ajparent1/KB1GMX <kb1gmx@...> wrote:
Well George,

Does the manual give a current for normal operation?  that is likely a good
number to never exceed.

If testing you do not want full power so a much lower number is used to
see if there is a short or some semblance of normal operation.
 
The point being if you have a short (did you do an ohm meter test first?)
you need to keep power(current) applied to levels that does not burn up
wires or circuit board traces or depend on slow acting fuses.

Test processes and test gear require understanding of their use.
Simply having them is not a guarantee of how to use them effectively.
It should be obvious that too little current is unlikely to harm anything
though it may not work properly.  Also too much could lead to
burn out but only if something is wrong.  

That means you need to have an idea of what normal is and lacking
that a way to arrive at it beside asking here or google.

HINT: for 50W out you must put more than 50W in as nothing is
100% efficient.  For the moment if the voltage required is 20V
than at 2.5A your putting in 50W of power.  Since the amp is
likely something like 70% efficient you need to be able to
supply about 72W at 20V or about 3.5A (rounded).  Its basic
arithmetic of voltage, current, and power.

Now with that in mind...  You have no idea that it was built right.
so are you going to set the current limit to maybe 500mA
1A, or 3.5A??   You will work your way up until your power
meter and all indicated both normal power and not excessive
current.  For example if you set to 500ma and instantly see
the power supply trip out likely you have a short.  Another case
is you work your way up and get to 3.5A but its not producing
50W, its producing much less and geting hot then you have
to investigate why or maybe try 4A and fry it.

I do recommend reading the manual at least several times
as the amount of information there is extensive. Especially
ALL OF Section 7: TESTING.

Allison
-------------------------------
Please reply on list so we can share.
Off list email goes to trash, I had to due to scrapers.

Re: 50 Watt Amp current limited supply

ajparent1/KB1GMX
 

Well George,

Does the manual give a current for normal operation?  that is likely a good
number to never exceed.

If testing you do not want full power so a much lower number is used to
see if there is a short or some semblance of normal operation.
 
The point being if you have a short (did you do an ohm meter test first?)
you need to keep power(current) applied to levels that does not burn up
wires or circuit board traces or depend on slow acting fuses.

Test processes and test gear require understanding of their use.
Simply having them is not a guarantee of how to use them effectively.
It should be obvious that too little current is unlikely to harm anything
though it may not work properly.  Also too much could lead to
burn out but only if something is wrong.  

That means you need to have an idea of what normal is and lacking
that a way to arrive at it beside asking here or google.

HINT: for 50W out you must put more than 50W in as nothing is
100% efficient.  For the moment if the voltage required is 20V
than at 2.5A your putting in 50W of power.  Since the amp is
likely something like 70% efficient you need to be able to
supply about 72W at 20V or about 3.5A (rounded).  Its basic
arithmetic of voltage, current, and power.

Now with that in mind...  You have no idea that it was built right.
so are you going to set the current limit to maybe 500mA
1A, or 3.5A??   You will work your way up until your power
meter and all indicated both normal power and not excessive
current.  For example if you set to 500ma and instantly see
the power supply trip out likely you have a short.  Another case
is you work your way up and get to 3.5A but its not producing
50W, its producing much less and geting hot then you have
to investigate why or maybe try 4A and fry it.

I do recommend reading the manual at least several times
as the amount of information there is extensive. Especially
ALL OF Section 7: TESTING.

Allison
-------------------------------
Please reply on list so we can share.
Off list email goes to trash, I had to due to scrapers.

Re: 80 Meter WSPR Freq?

Andy Brilleaux <punkbiscuit@...>
 

On Wed, Jan 1, 2020 at 11:03 PM, K2DB Paul Mackanos wrote:
And it is wrong , the operation manual needs to be updated
You're right.
I suspect Hans will have it amended it within the next 24 hours.
It also begs the question, why does wsprnet.org not list the freqs as real freqs, as opposed to only dial ones ?

Non WSPR software use, such as stand alone beacons have existed since at least 2012.

That's 8 years of about 10/11 year of WSPR's own existence.

More wsprnet.org arrogance.

73 de Andy

Re: 50W amp T2 continuity check

dbauer@...
 

After carefully reading the instructions (foreign concept for me) I agree with your analysis Dennis. By the time I receive my already ordered amp, I should be able to avoid some of these pitfalls.
Hny and 72 de Dave
 

From: Dennis Shelton
Sent: Wednesday, January 1, 2020 13:35
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] 50W amp T2 continuity check
 

I suspect that the manual is correct, looked at from the top side. We are soldering in a trifilar winding ONE WINDING AT A TIME. After the first connection, that winding should connect Q2 to C7 right side. The next winding DOES NOT connect Q1 to C7, but when the third winding is soldered in and the circuit is complete, Q1 will then be connected to C7. The test in the second step is to make sure that the wiring is not transposed.

To test this theory, you could disconnect the third winding and see if the Q1-C7 path opens up.

 

On 1/1/2020 3:08 PM, Jon Reck W8REA wrote:
So, is this section of the manual incorrect?

Second paragraph from the end of section 3.6, page 17:
"Check for NO continuity with the DVM, from the middle pin of transistor Q1, to the right hand side of capacitor
C7. You should NOT see any continuity here."

- Jon W8REA

Re: 80 Meter WSPR Freq?

K2DB Paul Mackanos
 

And it is wrong , the operation manual needs to be updated


On Wed, Jan 1, 2020, 3:54 PM Andy Brilleaux via Groups.Io <punkbiscuit=googlemail.com@groups.io> wrote:
It's on page 35 of the U3S operating manual ;-)
http://qrp-labs.com/images/ultimate3s/operation3.12a.pdf


73 de Andy

Re: WB5BKL: QCX Challenge 03:00

HB9FIH
 

HNY 2020 Hans tnx for Info

Next Challenge I will go up to the Mountain for 13 and 19 o'clock challenge

the 03:00 again from Shack (the bed is more near...)


--
---
73 de Erich

HB9FIH

HS0ZLS

Re: 50W amp T2 continuity check

Paul AI4EE
 

I suspect that the manual is correct, looked at from the top side. We are soldering in a trifilar winding ONE WINDING AT A TIME. After the first connection, that winding should connect Q2 to C7 right side. The next winding DOES NOT connect Q1 to C7, but when the third winding is soldered in and the circuit is complete, Q1 will then be connected to C7. The test in the second step is to make sure that the wiring is not transposed.

To test this theory, you could disconnect the third winding and see if the Q1-C7 path opens up.


On 1/1/2020 3:08 PM, Jon Reck W8REA wrote:
So, is this section of the manual incorrect?

Second paragraph from the end of section 3.6, page 17:
"Check for NO continuity with the DVM, from the middle pin of transistor Q1, to the right hand side of capacitor
C7. You should NOT see any continuity here."

- Jon W8REA

Re: #qcx #smoke #qcx #smoke

George Korper
 

Same here. I monitor WSPR more now. The blow out also took out Q6 and IC3. Antenna faults DO occur even to the best of us. Here gusty winds actually can break my MFJ collapsible whip which was recently improved by MFJ. Now I try to monitor WSPR and limit operation to intervals rather than keeping it on. 

Sockets on my next kit, to preserve the PCB.

On Wed, Jan 1, 2020, 3:11 PM Gerald Ball via Groups.Io <gerryball2=talktalk.net@groups.io> wrote:
Happy 2020 to all.

Just been reading topics during 2019, and this topic seems to have had a lot of debate with many brilliant but not so simple ways around avoiding blowing finals. I may be over simplifying the subject when I suggest that power should never be put into the aerial without a permanent SWR/Power meter in line or alternately (something not used these days so much) an aerial current meter in line. These are both basic monitoring methods and give immediate indication of any change in the state of the aerial whilst transmitting, after being used for tuning initially. It is also true, there is no fuse faster than a transistor junction!
Now for some gloating, I have so far built 3 of these absolutely fantastic rigs, all worked on switch on and so far none have blown a final.
I have run for short periods on WSPR but until I complete a mod to reduce the power I think the full 13.5 volts supply is chancing my arm, and also not really complying with the ethics of WSPR power levels. I am about to order the 80m and 60 m rigs and am confident they will also work perfectly, thankyou Hans. Ok chin out - blow a hole in that lot, I am thick skinned and can take it.

73/72 de G4OJF   

73 de