Date   

Re: Bad news #40m

Ham Radio
 

More from a troubleshooting aid point-of-view  as components are being replaced when doing a repair. 
--
73, Bernie, VE3FWF


Re: Battery recommendations for portable ops?

john.rogers@...
 

On Wed, May 13, 2020 at 06:46 AM, <john.rogers@...> wrote:
I use a second 3S in series with the radio battery to power the 50W amp
Correction: I use a 3S to power the QCX and 2S in series to power the 50W amp. 6S would be too high voltage. John


Re: QCX vs. QCX+ Form Factor Question

Serge, ON4AA
 

Yes, Hans, I also see potential for your stalagmites not meeting my stalactites :-D

On a different note, will the enclosure have a pair of folding feet under the front? I want to avoid getting a stiff neck in the field… (not the US police kind of stiff neck, though.)


Re: [help] Only noise being seen while IQ balance / phase lo / phase hi.

dl8lrz
 

Hi,
short test for IC10
Check again whether the marking on the circuit shows the display (ok, already done 100 times)
Use a protective resistor Rp approx. 220 Ohm (against unwanted short circuit), do not connect voltages directly to the PINs.
Connect voltmeter to PIN7
+ 12V via Rp at PIN5 -> PIN7 high, about 12V
+ 12V via Rp at PIN6 -> PIN7 low, about 0V
0V via Rp at PIN6 -> PIN7 high, about 12V
0V via Rp at PIN5 -> PIN7 low, about 0V
Remove Rp

Connect PIN7 and PIN6 directly (analog IC10A) -> PIN7 5V +/- (approximately equal to PIN5); if 12V -> IC defective?
remove the wire PIN7 - PIN6
if no 5V +/- at PIN7:
remove R37
if 5V +/- at PIN7 -> C22 defective ???
if further 12V -> IC10 defective ???

The voltages at PIN7 and PIN1 should be approximately the same.


  • "10k resistors, R39&40. =    10k confirmed.  solder continuity good.
  • 12 volt side of R40, =       11.9v
  • the junction of R39&40 =   3.32v
  • ground side of R39. =      zero"
The voltage should be about 4.2V (Manual), 3.32V is little. If C24 is installed with the correct polarity, this can indicate a defective IC10 ??

vy 73 Reiner


Re: #ocxo #ocxo

Alan G4ZFQ
 

regarding the external screen as shown in the OCXO photo for my U3S multiband.  I can't put it because it hits the IC1 below. I'd like to ask you if it's important and necessary to put it or it's optional.  thanks
Giuseppe,

I do not understand.
What does it touch?
IC1 is on the other side of the board. It's pins are seen at the left side, away from the cover.

This cover helps to screen and maybe more importantly to stop air currents from affecting the temperature.


Re: QCX vs. QCX+ Form Factor Question

Hans Summers
 

Hi Serge

Yes, I see...

The wide thickness of your assembly is due to the circuit board and the battery holders all adding up as thickness. 

Well there are some potential ways you could make it fit. The area is large. But 30.5mm is the limit to the depth - this assumes the components above the QCX+ PCB are allowed a height of 12mm. The only components which need this height are the LPF toroids, the electrolytic capacitors, and the 24-turn trimmer potentiometers. 

So perhaps, with careful orientation, your board could be positioned such that the "high" parts of the QCX+ circuit didn't interfere with the big parts of the battery controller board. Bolt the board to the roof with standoffs and make sure the positioning is such that the stalagmites never meet the stalagmites. 

OR... use the QCX+ Dev kit board, and separate the battery holders of your assembly, from the board. There seems to be plenty of space to have them side by side. 

OR... you could make the LPF toroids in the QCX+, and the capacitors and 24-turn trimmer pots, lie down - where necessary? The QCX+ PCB has lots of spare area so there is room to make things like down like that. 

Several options - but will take some experiment! 

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

On Fri, May 29, 2020 at 1:11 PM Serge, ON4AA <serge@...> wrote:

Here is the Wondom BCPB2 3S 18650 MPPT BMS I am talking about. Leaving out the DC connector, it is still 31.5 mm high with the electrolytic capacitors being the next highest components. However, if necessary, 1 mm can still be shaved off by replacing the 18650 cell holders.

It is pretty cheap, to the point that you perhaps could integrate it with your transceiver by default. The MPPT allows it to be used with a 18 to 24 V solar panel.

I got the idea of a video from Gil, F4WBY. He also employs this to supply power to his QCX radios. (Do not follow his suggestion of soldering directly to the cell terminals, though. Just apply once external power to the board to get it running.)

Wondom 3S 18650 BMS

The newer version PCBs have extra headers to drive external power level LEDs, without the need to add any extra series resistors.


Re: #ocxo #ocxo

Roger Hill
 

Sorry Giuseppe...I cannot help as I have never built one, but I am sure there are others here who can help.

Roger

G3YTN

---
***************************
Roger Hill
***************************


On 2020-05-29 07:15, GIUSEPPE wrote:

Hello everyone, my name is Giuseppe iu8eun. I would like to ask you for help regarding the external screen as shown in the OCXO photo for my U3S multiband.  I can't put it because it hits the IC1 below. I'd like to ask you if it's important and necessary to put it or it's optional.  thanks


#ocxo #ocxo

GIUSEPPE
 

Hello everyone, my name is Giuseppe iu8eun. I would like to ask you for help regarding the external screen as shown in the OCXO photo for my U3S multiband.  I can't put it because it hits the IC1 below. I'd like to ask you if it's important and necessary to put it or it's optional.  thanks


Re: ProgRock OCXO and GPS locked frequency accuracy.

Phil Crockford
 

I have done investigation on the accuracy of the GPS control using the Synth module in both the PRO-ROCK and the VFO Sig-gen and I also confirm a frequency difference between an off air standard and the GPS locked frequency derived by the two products.

If a synth module is used in the PRO-Rock it produces a frequency which deviates from the programed frequency by around 2 Hz and does not seem to attempt to correct any further in order to align with the off air standard. However if the same synth module is used in the VFO SIG-Gen and corrected by the same GPS used for the PRO-Rock the Sig-Gen produces an accuracy of better than .5Hz from the programmed frequency and continues to correct itself from then on.

Until now I have resolved to apply a correction to the programmed frequency when using in the Pro-Rock and was content not to communicate my findings to the group. I have a number of Synth modules , OCXO and standard and find the same with all modules when compared in this manner.

The initial acquisition process in the Pro-Rock seems to work well but once this is achieved it seems reluctant to control the frequency any further.

This test have been done with the correction set to 001 and also set to 000 but the pro-rock seems to fail to control the frequency to within less than 2Hz.

Both the Sig-Gen and the Pro-Rock have been run at the same time and controlled by the same GPS using two Synth modules known to exhibit the 2Hz error. The Sig-Gen produces a frequency that is correct to within less than .5Hz but he Pro-Rock Controls to within 2Hz.

 

This email is by way of information and is not intended a criticism of any  product.

 

G8IOA

 

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Mark Horn
Sent: 09 May 2020 19:26
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] ProgRock OCXO and GPS locked frequency accuracy.

 

Hans, 

Forget my last message after three hours of being within 0.5ppm I went for dinner and when I came back it was off by 1.5Hz again.  :-(  I'll leave it run for another hour and see what it measures then.

73 Mark
M0WGF


Re: ProgRock + TCXO + GPS Stability/Accuracy

Phil Crockford
 

I have done investigation on the accuracy of the GPS control using the Synth module in both the PRO-ROCK and the VFO Sig-gen and I also confirm a frequency difference between an off air standard and the GPS locked frequency derived by the two products.

If a synth module is used in the PRO-Rock it produces a frequency which deviates from the programed frequency by around 2 Hz and does not seem to attempt to correct any further in order to align with the off air standard. However if the same synth module is used in the VFO SIG-Gen and corrected by the same GPS used for the PRO-Rock the Sig-Gen produces an accuracy of better than .5Hz from the programmed frequency and continues to correct itself from then on.

Until now I have resolved to apply a correction to the programmed frequency when using in the Pro-Rock and was content not to communicate my findings to the group. I have a number of Synth modules , OCXO and standard and find the same with all modules when compared in this manner.

The initial acquisition process in the Pro-Rock seems to work well but once this is achieved it seems reluctant to control the frequency any further.

This test have been done with the correction set to 001 and also set to 000 but the pro-rock seems to fail to control the frequency to within less than 2Hz.

Both the Sig-Gen and the Pro-Rock have been run at the same time and controlled by the same GPS using two Synth modules known to exhibit the 2Hz error. The Sig-Gen produces a frequency that is correct to within less than .5Hz but he Pro-Rock Controls to within 2Hz.

 

This email is by way of information and is not intended a criticism of any  product.

 

G8IOA

 

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of Hans Summers
Sent: 28 May 2020 11:14
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] ProgRock + TCXO + GPS Stability/Accuracy

 

Hello Giuseppe

 

Setting register 3 to zero affects how often the frequency is updated. It does NOT affect how often the EEPROM is updated, using the Reference Clock value held in RAM. 

 

The calibrated Reference Clock value held in RAM is only written to EEPROM if the difference between the existing EEPROM value and the RAM value exceeds 10Hz. Therefore in practice the EEPROM is updated rarely. 

 

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

 

On Thu, May 28, 2020 at 10:27 AM Giuseppe Marullo <giuseppe@...> wrote:

Hi Hans,

this is what is written in the manual:

"If you set the register to have a value of 0, then the microcontroller
will adjust the Si5351A output frequencies once per second, every
second, depending on whether it thinks the 27MHz frequency has drifted
upwards or downwards. This continuous change in output frequency may not
be desirable. It is more practical to have small jumps in output
frequencies, less often – i.e. only when the reference oscillator has
changed by more than a threshold.
The QRP Labs website has some notes on how to obtain excell"

How often I could expect the eeprom to be written if I set the register
3 to 0?
Could you recommend 24/7 operation?

TIA

Giuseppe Marullo
IW2JWW - JN45RQ

On 5/28/2020 8:45 AM, Hans Summers wrote:
> Hi Giuseppe
>
> FYI the ProgRock does not write to EEPROM once per second. It only
> writes to EEPROM once in a while when the error (stored ref freq value
> to actual value held in RAM) exceeds a threshold. So writing to EEPROM
> is quite rare and does not wear out the EEPROM (rated 100,000 cycles
> in the datasheet; I saw some practical experiments on an ATmega328 to
> try and destroy the EEPROM and it actually lasted nearer to 1 million
> in practice).
>
> I have a beta ProgRock version which allows update of the frequency
> via the serial port, without writing the registers to EEPROM - so that
> would be useful in an application where the constructor wishes to do
> things like repeated frequency sweeps, and not wear out the EEPROM.
>
> 73 Hans G0UPL
> http://qrp-labs.com
>
> On Thu, May 28, 2020 at 5:39 AM Giuseppe Marullo <giuseppe@...
> <mailto:giuseppe@...>> wrote:
>
>     Hi Sid,
>
>     I know that some people got their "quirks" with the accuracy of this,
>     you were not the only one looking back the ML.
>     I have received a new MCU, to rule out eeprom wear, since I kept it
>     powered several weeks and if fhe eeprom is written once a second,
>     well I
>     expect it not to work anymore, theoretically it will die after
>     27hours.
>     I was past 10x this period, easily.
>
>     My problem is not that it is not spot on on 10MHz. The problem is
>     that
>     it stays about 2.4Hz below 10MHz of my Trimble. It is almost
>     constant,
>     like either my Trimble is not 10MHz and it is stable, let's say it
>     is @
>     10.0000024MHz, or ProgRock decides that 9.9999976MHJz is the right
>     frequency. I am evaluating getting another source for my lab, if I
>     could
>     acquire at a decent price. Unfortunately there is no visible feedback
>     from the ProgRock about what is really doing, if it consider itself
>     within range or what.
>
>      >The most common "solution" recommended is to replace the xtal
>     with a
>     TCXO which is no solution that simply masks the problem. That's the
>     discipline...use a clock source that does not drift!!
>     Hehe, mind to give me a DigiKey part number with less than 12
>     digits in
>     the price column? Everything drifts within a hobbyist budget, that
>     the
>     point in the disciplined part of their name.
>     I am already using QRPLabs TCXO BTW.
>
>     Waiting to perform the surgery on the ProgRock, then I will
>     analyze the
>     PSU too(didn't check it yet). Not much left to look at though.
>
>     I am building some GPIB interfaces to connect the frequency
>     counter and
>     log data programmatically, it will take 2-3weeks tough, waiting for
>     AR488 pcb to arrive.
>
>     Giuseppe Marullo
>     IW2JWW - JN45RQ
>
>
>
>
>



QCX Plus 50 Watt PA Combo

George Korper
 

Hi All,
Hans has published the dimension available and I am looking for
designs to incorporate the 50 watt amp inside the case. 
 Can you separate the IRF510  and heatsink from the board with wires?
Or would it better to just leave it in case and bolt on, etc. 
Any suggestions would be helpful. Is the case itself enough heatsink for 
moderate use?
George
K3GK


Re: QCX vs. QCX+ Form Factor Question

Serge, ON4AA
 

Here is the Wondom BCPB2 3S 18650 MPPT BMS I am talking about. Leaving out the DC connector, it is still 31.5 mm high with the electrolytic capacitors being the next highest components. However, if necessary, 1 mm can still be shaved off by replacing the 18650 cell holders.

It is pretty cheap, to the point that you perhaps could integrate it with your transceiver by default. The MPPT allows it to be used with a 18 to 24 V solar panel.

I got the idea of a video from Gil, F4WBY. He also employs this to supply power to his QCX radios. (Do not follow his suggestion of soldering directly to the cell terminals, though. Just apply once external power to the board to get it running.)

Wondom 3S 18650 BMS

The newer version PCBs have extra headers to drive external power level LEDs, without the need to add any extra series resistors.


Re: Heresy follows Re: [QRPLabs] IRF510 #alignment #magic of hollow state #alignment #magic

Ted 2E0THH
 

On Fri, May 29, 2020 at 02:15 AM, ajparent1/KB1GMX wrote:
Its still about the magic of hearing a
voice from across the street or some ocean.
Beautifully sums it up Allison. I'm still giddy that this little QCX marvel made it all the way from the UK to Tasmania on WSPR from a dipole atop a 1 metre high beech hedge! It is magic.
My glowing collection involves an Eddystone S556, a Codar TR45 I built as a kit in the '60s and most recently a Trio 9R-59D, I was looking for an oscillator to tune this radio up when I happened upon the QCX.......

73s Ted 
2E0THH


Re: IRF510 #alignment

Andrew Lenton
 

Hi,

 

I have just raised the supply to 13.8V, and linearity, and improved no end, as I step down 1dB at a time, the amp output, follows with in 0.94dB!

 

Using a R & S NRP8S

 Sig Gen -1dB          =         -0.94dB

Sig Gen -3dB          =         -2.96dB

Sig Gen -6dB          =         -5.94dB

Sig Gen -9dB          =         -8.97dB

Sig Gen -10dB         =         -9.93dB

 

 

73

 

Andrew


Re: A great QCX-QCX contact and salute to youth

Hans Summers
 

Hi Ted
 

I know of one other regular poster on this forum that knows this area rather well J


Yes indeed! I was so lucky that Akihabara was a 2-station train ride from my office. I could literally be there, door to door including the walk to/from the stations at either end, in 15 minutes each way. That left 30 minutes to peruse and buy what I needed. So I could be there and back in a lunch hour! Many QRP Labs kits started their development using components found in Akihabara. And yes, sometimes I did not make it back in an hour so had to have plenty of excuses on hand :-D

Later I had one of the popular eBikes (you pedal but an electric motor assists) known as Mamachari which literally translates to "Mummy Bike". Actually we bought it for XYL to use but between one lab tech and another it was me that ended up zooming all over Tokyo on it. So then it was even faster to get to Akihabara and back in a lunch hour, through the Tokyo back streets. 

Happy memories! 

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


Re: A great QCX-QCX contact and salute to youth

Ted 2E0THH
 

Fabulous insight Jim

 

My first visit was only back in the '80s but I’ve been there nearly every year since, sometimes more. I worked in music and more specifically flew one of those huge mixing consoles (SSL) that was mandatory in every recording studio back then. Like any complex bit of kit it had a huge manual but there were many ways to make it work for you that weren't written in there.

 

I honestly will never forget the look of horror of the Japanese assistant techs  as I "bent" the rules of operation, there was much manual page fumbling and protest but I managed to forge on citing translation difficulties.

 

That first session was a long project, 6 weeks I think so we got to know each other very well. By then I was reasonably world travelled but Tokyo was a utter culture shock. All of the Japanese involved in that project were so unbelievably hospitable and generous, way beyond anything I had ever known and it is a testament to the trust we built that I still remain friends with most from that first visit. Music still takes me back there most years but alas not this one for obvious reasons.

 

Those guys introduced me to a district of Tokyo around Akihabara Station in the Chiyoda ward of Tokyo. There is nothing you can do to prepare yourself for the onslaught of the visual and audio cacophony that awaits; there are certainly no words I can write here that will describe it but it has become a Mecca for me and I have made the pilgrimage on almost every visit. 


A visit here should be on every ham's bucket list, for underneath the railway arches by the station there is a labyrinth of corridors which hosts a mini market of EVERYTHING electronic. The pitches are arranged along one wall and are about 2 metres wide with the trader lurking in the shadows behind trays and trays of beautifully arranged components, the more successful have bigger areas but it is the presentation of the components on offer that is so breathtaking. If you have any old '60s radio that has lost a foot, you will find it here, 813 tetrode with a thoriated tungsten filament, no problem. Really they have everything, there was even an HRO there last November.

 




I know of one other regular poster on this forum that knows this area rather well
J

 

73s Ted
2E0THH


Re: Bad news #40m

Trystan G0KAY
 

Bernie,

That looks interesting. I think your post has gone onto the wrong topic?

A current limiter won't stop popping the finals when there is no antenna connected, or fix a broken QCX.

I'm guessing you're replying to a different post?

Trystan


Re: QCX/QCX+ Serial number 10,000 auction for fun

Hans Summers
 

Hi Scot

There aren't any QCX boards left here. 

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

On Fri, May 29, 2020 at 1:02 AM scot forshaw <scot.forshaw@...> wrote:
Haha 😂 

Hans is there any Rev 5 boards left? I’d like another to build guidos ssb mod?

Cheers
Scot


On 15 May 2020, at 09:50, Hans Summers <hans.summers@...> wrote:


Hi JP: I never said anything about charity! The charity is the save-the-Hans fund. Or save-the-QRP-Labs-lab-rats. Something like that? 

Hi Mike: thanks for the congrats. Yes, now incl FedEx delivery :-) It didn't, before. Special promotion :-)

Hi Mark: I have updated the list of serial numbers vs order ID, see http://qrp-labs.com/qcx/qcxserial.html - so look up your order ID and then find it in the table. Or contact me if you can't find it. 

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


Re: QCX vs. QCX+ Form Factor Question

Hans Summers
 

Hi Serge

If you assume that the through hole components on the upper side of the PCB require 12mm of space - which is approximately true in the case of some tall components such as upright toroids and the electrolytic capacitors - then the available volume is 96mm wide x 30.5mm high x 120mm deep. 

I'm not sure why you would need 92 x 70 x 35mm for three 18650 cells. By definition the size of a 18650 is 18mm diameter and 65.0mm length (this is in the type name). Three of these would therefore fit in a space with dimensions 65 x 54 x 18mm. I know you said there is charge controller and battery management circuit... but unless these are very big, or I am missing something, this battery pack should easily fit, even twice! 

73 Hans G0UPL

On Fri, May 29, 2020 at 4:38 AM Serge, ON4AA <serge@...> wrote:

I am looking for a clearance of 92 × 70 × ~35 mm to fit those 3S 18650s with their BMS. Would that fit inside the empty space of the planned enclosure?


Re: QCX FS

Bob Finch
 

Please send along a private email to me.... w9ya@amsat.org

On Thu, May 28, 2020 at 7:54 PM Ward Wheaton via groups.io
<wmwheaton=aim.com@groups.io> wrote:

Just ordered the QCX+ so I'm offering an unbuilt QCX 20m kit for sale along with a new BaMaTech case. Also have a built 30m in the BaMaTech case for sale. $100 for either one, shipped to US.

Ward K7PO
Tonopah, AZ

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