Date   

Ultimate U3S Current requirements #u3s

Julian Rolfe
 

Just wondering what the current requirements are for the Ultimate are fully loaded running 3 x BS170’s At 5V please.

Just about to start building mine and seeing what puck might be suitable for down converting with limited space.

Thanks,
Jules - G4UET


Re: PA.

GIUSEPPE
 

ok, thank you very much for your help, i will let you know. again Lucien, 73 July 8 from Calabria


Il gio 11 giu 2020, 11:20 LUCIEN WILDER via groups.io <sparxx=btinternet.com@groups.io> ha scritto:
I built the PA as shown in the drawing and it works OK. The flow of RF is from the main board to the PA with wire/cable, then back to the relay board via the existing header/pins, then out via the RF connector on the relay board to the antenna. The PA uses 12V only as it already has a 5V regulator. C5 on the main board needs to come out.


Re: WSPR data analysis #qcx40 #wspr

Alan G4ZFQ
 

Ted,

This expands on the link I sent

https://wsjtx.groups.io/g/main/message/11343

As I say I've not tried it but it looks a useful program for those who worry about WSPR/PSKReporter data.

Also this https://groups.io/g/ProgramsByW2JDB is where you find it
73 Alan G4ZFQ


Re: PA.

LUCIEN WILDER
 

I built the PA as shown in the drawing and it works OK. The flow of RF is from the main board to the PA with wire/cable, then back to the relay board via the existing header/pins, then out via the RF connector on the relay board to the antenna. The PA uses 12V only as it already has a 5V regulator. C5 on the main board needs to come out.


Re: PA.

GIUSEPPE
 

Hello everyone, I'm Giuseppa IU8EUN, I wanted your help on how to connect the PA to the U3S because I have some doubts.  in the photo I sent, the purple arrow shows the 2x5 pin connector connected normally with the connection of the RF output of the PA, I was wondering if you need to solder only the RF coaxial cable as shown in the figure or do you have to eliminate some connection ??  Another thing the veede arrow shows the pin for the 5v head power supply for OCXO that I have normally connected, as no connection powered at + 5v is mentioned. Thanks.  Have a good day everyone


Il gio 11 giu 2020, 06:32 Hans Summers <hans.summers@...> ha scritto:
Hi Halden

No. It is not correct that interrupts are masked during transmission to get timing correct. A possible explanation for your more drifting CPU clock during more transmissions is that greater amounts of heat from the PA are reaching the 20MHz crystal and causing the frequency to change slightly. 

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

On Thu, Jun 11, 2020 at 5:20 AM HF via groups.io <incorridge=yahoo.com@groups.io> wrote:
Okay, I have the TCXO ready.  I'll give it a try per Alan's suggestion.  But I just realized that calibrating it might raise an interesting issue.
For a while, I was using the U3S to transmit alternately on 2 different bands.  Then I resumed transmitting on just one band.  I noticed that my timing drift was greater when making 2 transmissions in a 10-minute period than it was when I only made one.  I guess this means that during a transmission, the CPU's internal clock doesn't increment the same amount as it does when not transmitting.  I suppose the internal clock raises an interrupt from time to time (so to speak) and during a transmission the interrupts have to be masked so that the timing of the transmission is correct.  Am I right?  Has anyone else noticed this?
The consequence I anticipate is that once I install the TCXO to run the CPU and measure its frequency ( I think I can get it within 4 Hz), entering its exact frequency into the software might not work.


Re: #clock TMP36 #clock

KEN G4APB
 

Hi all, this was fixed in version c1.03...
ADC now averages 100 samples to reduce noise (for temperature calculation etc)

73 Ken G4APB


Re: TCXO for U3S CPU clock #u3s #clock

Hans Summers
 

Hi Halden

No. It is not correct that interrupts are masked during transmission to get timing correct. A possible explanation for your more drifting CPU clock during more transmissions is that greater amounts of heat from the PA are reaching the 20MHz crystal and causing the frequency to change slightly. 

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

On Thu, Jun 11, 2020 at 5:20 AM HF via groups.io <incorridge=yahoo.com@groups.io> wrote:
Okay, I have the TCXO ready.  I'll give it a try per Alan's suggestion.  But I just realized that calibrating it might raise an interesting issue.
For a while, I was using the U3S to transmit alternately on 2 different bands.  Then I resumed transmitting on just one band.  I noticed that my timing drift was greater when making 2 transmissions in a 10-minute period than it was when I only made one.  I guess this means that during a transmission, the CPU's internal clock doesn't increment the same amount as it does when not transmitting.  I suppose the internal clock raises an interrupt from time to time (so to speak) and during a transmission the interrupts have to be masked so that the timing of the transmission is correct.  Am I right?  Has anyone else noticed this?
The consequence I anticipate is that once I install the TCXO to run the CPU and measure its frequency ( I think I can get it within 4 Hz), entering its exact frequency into the software might not work.


Re: #clock TMP36 #clock

Brian Helm
 

0.1uF cap from pin 2 (vout) to pin 3 (gnd) on TMP36 sensor fixed this for me.
This also fixed the temp variation I saw while transmitting from my HF rig.
 TMP36 datasheet also shows 0.1uF cap in their examples from pin 1 to pin 3 (supply voltage).  I already had this in place and it didn't fix the problem.  


Re: Shipping FAQ

KI7MWA
 

Ahhh...another day in "Pending Delivery" purgatory...


Re: TCXO for U3S CPU clock #u3s #clock

HF
 

Okay, I have the TCXO ready.  I'll give it a try per Alan's suggestion.  But I just realized that calibrating it might raise an interesting issue.
For a while, I was using the U3S to transmit alternately on 2 different bands.  Then I resumed transmitting on just one band.  I noticed that my timing drift was greater when making 2 transmissions in a 10-minute period than it was when I only made one.  I guess this means that during a transmission, the CPU's internal clock doesn't increment the same amount as it does when not transmitting.  I suppose the internal clock raises an interrupt from time to time (so to speak) and during a transmission the interrupts have to be masked so that the timing of the transmission is correct.  Am I right?  Has anyone else noticed this?
The consequence I anticipate is that once I install the TCXO to run the CPU and measure its frequency ( I think I can get it within 4 Hz), entering its exact frequency into the software might not work.


Re: QCX+ wishlist - wire tilt bail DIY

ajparent1/KB1GMX
 

I forget that handle fold flat to the bottom and makes for useful feet.

Its call a FOLDING PULL HANDLE.

-------------------------------
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No private email, it goes to a bit bucket due address harvesting


Re: QCX+ wishlist - wire tilt bail DIY

ajparent1/KB1GMX
 

For on project I used the below as it also made a good solid carry handle.
Placed on the bottom the high and that radios length worked out to a perfect angle.

https://www.mcmaster.com/1327A12

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


Re: WSPR data analysis #qcx40 #wspr

Ted 2E0THH
 

Alan & Geoff

Thank you!
That should have occurred to me, I have MS Access too. 

73s Ted

2E0THH


Re: QCX+ wishlist - wire tilt bail DIY

WB9ICF
 

For those with access to a 3D printer... 

https://www.thingiverse.com/thing:3954466

I printed a pair of these using PLA and they seem sturdy enough, but time will tell. If they break at some point, I will try again using PETG.
--
Ralph - WB9ICF


Re: WSPR data analysis #qcx40 #wspr

geoff M0ORE
 

I agree with Alan, a database program might be better however Access was an add on for the Microsoft Office suite. You could have a look at the OpenOffice version which is almost identical to Microsoft and includes the database as standard and is free to all. dot csv files can be imported into the database.


On 10/06/2020 16:39, Alan G4ZFQ wrote:
I've downloaded the csvs for those periods  but I am finding that MS Excel cannot deal with the colossal amount of information and only partly imports it.

Ted,

A Database program is needed eg. Access for Windows.
Also this https://groups.io/g/ProgramsByW2JDB might work, I've not tried it.

73 Alan G4ZFQ




Re: WSPR data analysis #qcx40 #wspr

Alan G4ZFQ
 

I've downloaded the csvs for those periods  but I am finding that MS Excel cannot deal with the colossal amount of information and only partly imports it.
Ted,

A Database program is needed eg. Access for Windows.
Also this https://groups.io/g/ProgramsByW2JDB might work, I've not tried it.

73 Alan G4ZFQ


Re: 5W HF PA - setting bias current

Martin
 

Ah, yes, of course - i'd not considered instability!

Very good point.

Martin G7MRV


Re: Beep in TX

Daniel Conklin
 

On Tue, Jun 9, 2020 at 07:49 PM, Eng. Fabio Barroso wrote:
Daniel,
 
I am sending a video to show the problem, this sound of click is very bad on using headphone.
 
Link of Video: 
 
 
Tks, Fábio PT7CA 

Em ter, 9 de jun de 2020 às 14:34, Daniel Conklin <danconklin2@...> escreveu:
Fabio,
Can you post a short audio recording? 


On Mon, Jun 8, 2020 at 01:11 PM, Eng. Fabio Barroso wrote:
Hi builders,
 
My QCX for 40m have a unpleasant beep, like switching, during the transmission, my board is Rev 5, and firmware is 1.04. Any suggestions?
 
Tks, 73
--
Fábio Barroso Brito
Engenheiro de Telecomunicações
CREA 061787033-0 

 Also, try the built in microswitch key to see if you get the same effect. 
--
73, Dan - W2DLC

 

 

--
Fábio Barroso Brito
Engenheiro de Telecomunicações
CREA 061787033-0 

 
--
73, Dan - W2DLC


WSPR data analysis #qcx40 #wspr

Ted 2E0THH
 

I'm trying to do some WSPR analysis on transmissions my QCX made during April and May.
I've downloaded the csvs for those periods  but I am finding that MS Excel cannot deal with the colossal amount of information and only partly imports it.
Does anyone know of a program that can cope?

73s Ted
2E0THH


Re: Beep in TX

Daniel Conklin
 

Fabio, I know that Hans has built in some programming to avoid clicks when keying. I can't identify the cause exactly, but it does sound like some kind of key bounce. Try resetting the software in the menu 7.12 Factory Reset. Maybe that will put it back in the correct delay settings to remove the clicks. 


On Tue, Jun 9, 2020 at 07:49 PM, Eng. Fabio Barroso wrote:
Daniel,
 
I am sending a video to show the problem, this sound of click is very bad on using headphone.
 
Link of Video: 
 
 
Tks, Fábio PT7CA 

Em ter, 9 de jun de 2020 às 14:34, Daniel Conklin <danconklin2@...> escreveu:
Fabio,
Can you post a short audio recording? 


On Mon, Jun 8, 2020 at 01:11 PM, Eng. Fabio Barroso wrote:
Hi builders,
 
My QCX for 40m have a unpleasant beep, like switching, during the transmission, my board is Rev 5, and firmware is 1.04. Any suggestions?
 
Tks, 73
--
Fábio Barroso Brito
Engenheiro de Telecomunicações
CREA 061787033-0 

 
--
73, Dan - W2DLC

 

 

--
Fábio Barroso Brito
Engenheiro de Telecomunicações
CREA 061787033-0 

 
--
73, Dan - W2DLC