Date   

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


Re: Si5351: P1, P2, P3, what's it really all about?

Guido PE1NNZ
 

Sorry Phil,

I misread your question, so my answer does not make sense, and please reject my previous email.
It is a good question what happens for value in between 128 for P2, no idea...never tried.

On Wed, Jun 10, 2020 at 11:30 AM Guido PE1NNZ via groups.io <threeme3=gmail.com@groups.io> wrote:
Hi Phil,
This is mathematically valid, does it work? Is there anything in the datasheet or application notes which says we can't do this? Is there any effect on the jitter or other performance?
My understanding is that this allowed and works. as it meets the criteria that "a+b/c has a valid range of 15 + 0/1,048,575 and 90"  [AN619 p.3 par. 3.2].
A zero in b means that there is no fractional part involved, and improves the jitter performance, when you set FBA_INT/FBB_INT [AN619 p.4 par. 3.2.1].

BUT!! then do not start using fractional divisions on the Multi-synth dividers as the jitter is worse compared to fractional dividers in the PLL Multisynth.


Re: Si5351: P1, P2, P3, what's it really all about?

Guido PE1NNZ
 

Hi Phil,
This is mathematically valid, does it work? Is there anything in the datasheet or application notes which says we can't do this? Is there any effect on the jitter or other performance?
My understanding is that this allowed and works. as it meets the criteria that "a+b/c has a valid range of 15 + 0/1,048,575 and 90"  [AN619 p.3 par. 3.2].
A zero in b means that there is no fractional part involved, and improves the jitter performance, when you set FBA_INT/FBB_INT [AN619 p.4 par. 3.2.1].

BUT!! then do not start using fractional divisions on the Multi-synth dividers as the jitter is worse compared to fractional dividers in the PLL Multisynth.


Re: U3S kit, WSPR multiband schedule? #wspr #firmware #u3s

Cathal Ferris
 

Thank you both for the feedback, that does clarify exactly what I was looking for. I'm also realising that I had not correctly grepped the operation manual, as the exact answer to the question is on page 4, second paragraph:
" When the system is placed into the Run mode, it will sequence through all enabled mode configurations in turn. This allows you to program sequences of bands, if you have connected the optional relay-switched Low Pass Filter (LPF) kit. "

Still, I'm glad I asked the question, as I now have some more interesting things to consider.

Andrew - thank you for the pointer for the thermals cycling reminder during CAL, and you've given me some useful pointers overall and I'm letting the ideas sit while the old subconscious figures it out. I have possible solutions to hand but it'll be the making elegant of the solutions that will be the fun bit. I can see a possible external routing of a control cable along with two short coax cables in one possible solution, or putting some fans in. The kit as a whole will hopefully be sitting in a moderately sized weatherproof box along with a solar charge controller and voltage regulators for 5v 7.5v and 14v for the kit and selectable PA drive voltage. More experimentation to be done after kit arrival/construction and then actual testing later in the summer when I'll be allowed to transmit..

Ken - perfectly clear, and sense has been made. I think I have a good handle on the relay kit implementation and operation, it is a nice setup. Regarding the ATU performance, I have en route to me at the moment Ebay/Aliexpress self-solder kits for the ATU-100 designed by N7DDC, and I also have the LDG Z11 Pro 2 ATU with a listed minimum of 100mW transmission to tune which (if performing to spec) will work just fine for the intended purpose.

Again thank you.
-Cathal


Re: U3S kit, WSPR multiband schedule? #wspr #firmware #u3s

KEN G4APB
 

Hi Cathal,
the U3S will auto cycle through a maximum of 16x 2minute operational slots in sequence. You have to re--set the default from 3 slots (TxS). You can choose the transmission mode (WSPR) and frequency different for each slot but you must match the LPF with the frequency as well. It is possible for some bands to re-use the the same LPF but you have to be able to check the harmonic suppression is suitable.
It is not recommended to use the WSPR double frequency modes for normal and multiband operation. 
For 'silent slots' you can use the 'RX' mode. 
You need to set and allow a 2 minute gap for CAL update at the end of a full sequence so you need to calculate and set your FRAME carefully, i/e 16 active slots plus CAL = 34 minutes repeat cycle, but then you get long periods of nothing happening so I tend to limit my operational slots to 9 (=18 minutes) plus CAL (2 minutes) and FRAME at 20 minutes so it all repeats at 40 and 60 minutes.
Hope this all makes sense.
I use an LDG Z11 auto atu but it does need at least 500mW to auto set, so you may have to run you U3S PA at higher than 5v (say 10v) to get sifficient power without resorting to the compllcation of an external PA and re-wiring of the LPF paths.

regards
Ken G4APB


Re: U3S kit, WSPR multiband schedule? #wspr #firmware #u3s

Andrew Lenton
 

Dear Cathal,

 

The U3S can cycle through all six bands but you will have buy the relay unit, so you can select the apocopate band pass filter. I do not think you can run through all six WSPR modes then on the second pass switch to extended WSPR, but I may be wrong.

 

With regards Band Pass Filters the highest frequency you are using must go in slot 1 of the band pass filter as this is always in circuit by design. With the relay board in operation, the U3S becomes BPF 0, and physically above it is BPF 5, BPF 1 is at the far end. You can cycle through in any order you wish.

 

With regard using an auto ATU, make sure you buy one that will auto tune automatically, some Auto ATU require you to push a button to get to tune. (Elecraft T1 for example). Most Auto ATU, require a minimum power typically between 3-5 Watts, (except the Elecraft T1, but this has a manual tune button) You will need to use the 5 Watt amp, however, you must place the LPF after the 5 Watt amp electrically. The 5 Watt cannot share the same custom enclosure without a lots of extra cooling, as the heat sink will be inside the case, some fans will be required, or mount the 5 Watt on a separate  heat sink.

 

This then gets tricky, as to where you physically place the  Low Pass Filters. RF path: U3S out to 5 Watt, then through the LPF then to the auto ATU then to the aerial. I hope this helps. If you cycle through 6 bands you will need a cal period of at least 2 mins, at the end of the cycle and if the U3S is in with the 5 Watt amp it will not be thermally stable, as the enclosure will be cooling down during the call period, so a fair bit to consider.

 

I run my 5 Watt amp in a separate enclosure with its own BPF switching controlled by the U3S, see photo. You will also need to provide some extra buffer switching if you use second relay board, as the U3S can only handle up to 40mA relay switching ( filter board relays require 28mA). By having two LPF relay boards, the U3S can run without the 5 Watt amplifier (barefoot)

 

BR

 

Andrew



Re: Clock Alarm with Speaker within Case #clock #case #mods

collinschip2@...
 

Ken,  we understand that we connect the ground side of the speaker to a free alarm output pin on the board.  Do we now need to program a second alarm?  It seems so.   If the primary alarm is programmed to start at 8 am,  then do we program the secondary alarm for 8 am also?

we can test these settings.  No worries.

thank you for the great suggestion.

Chip Collins,
N4CHP


Re: Beep in TX

Eng. Fabio Barroso <fbbrito@...>
 

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 


Re: Shipping FAQ

Mike Besemer - WM4B
 

I’m chill.  Back to work now anyway!

 

Mike

WM4B

 

From: QRPLabs@groups.io [mailto:QRPLabs@groups.io] On Behalf Of RACHAEL SANDERS
Sent: Tuesday, June 9, 2020 4:55 PM
To: QRPLabs@groups.io
Subject: Re: [QRPLabs] Shipping FAQ

 

Chiiiiill Mike!



On 9 Jun 2020, at 18:43, Mike Besemer - WM4B <mwbesemer@...> wrote:



Looks like one of mine broke loose. The oldest one is still lost in space.

 

Mike

WM4B

On Jun 9, 2020 9:55 AM, "KI7MWA via groups.io" <entilleser@...> wrote:

Well, perhaps it is my karma... TNT Tracking now says: "Scheduled delivery pending"...whatever that means...


Re: Shipping FAQ

RACHAEL SANDERS
 

Chiiiiill Mike!


On 9 Jun 2020, at 18:43, Mike Besemer - WM4B <mwbesemer@...> wrote:


Looks like one of mine broke loose. The oldest one is still lost in space.

Mike
WM4B
On Jun 9, 2020 9:55 AM, "KI7MWA via groups.io" <entilleser@...> wrote:
Well, perhaps it is my karma... TNT Tracking now says: "Scheduled delivery pending"...whatever that means...


Re: External amplifier control for U3

Phil Frost <indigo@...>
 

The U3S brings PB5 out to a header just for this. Check out the operating manual for the latest firmware and search the document for "amplifier": https://www.qrp-labs.com/ultimate3/u3firmware.html

I don't know if the U3 has the header connection, so maybe you just need to scab on a wire some other way.

On Sat, Jun 6, 2020 at 2:36 PM Manuel Verde Salmerón <ea7tb@...> wrote:
Hi.
I have ultimate U3, plate "Rev 2".
I want to put an external applicator to increase the output power
First I'm going to do the transformation to go from U3 to U3S. (Https://www.qrp-labs.com/ultimate3/u3mods/u3tou3s.html)
When making this modification, the microprocessor's PB5 signal is not used.
Can this signal be used to activate an external amplifier?
How else could it be done?
Regards.
Manuel EA7TB



Re: 5W HF PA - setting bias current

Arv Evans
 

Setting the bias current with no load may be risky.  If there is any 
oscillation in the finals they could be destroyed.

Arv
_._


On Tue, Jun 9, 2020 at 11:49 AM Martin <marting7mrv@...> wrote:
As I understand it, by adding a temporary link to load the DA shift register with 255, I can set the bias point by monitoring the supply current drawn, with no need for any RF drive.

Is this all there is to it? As theres no drive, do I take it that there is no requirement to terminate the output? Or, does the output require at least to 'see' a 50 ohm load?

I will be adding this amp into my 6-band U3S case,

Regards
Martin G7MRV


Si5351: P1, P2, P3, what's it really all about?

Phil Frost <indigo@...>
 

Reading AN6918 <https://www.silabs.com/documents/public/application-notes/AN619.pdf>, in configuring the PLL it talks of a fractional multiplier a+b/c. It then has some calculations to arrive at P1, P2, and P3 which are written to the configuration registers. I've been trying to come to some understanding about why this transformation takes place and the consequences.

The equations are:

P1 = 128 x a + floor(128 * b/c) - 512
P2 = 128 * b - c * floor(128 * b / c)
P3 = c

My first observation is P2 can be written more clearly (I think) as:

P2 = (128 * b) mod c

Secondly, only P1 depends on a, and if b/c is allowed to be an improper fraction than it can be simplified to:

P1 = floor(128 * b/c) - 512

Finally, b is always multiplied by 128. If we just say:

f_PLL = f_xtal * b / c / 128

then the equations can be further simplified:

P1 = floor(b / c) - 512
P2 = b mod c

I had assumed "b" must be an integer, and thus the smallest increment that could be represented is 1/1048575. But I don't see that directly stated in the documentation.

If c == 1048575 (as it always is, in the example code) and b is an integer, then as b increases by 1, P2 increases by 128 until it is no longer less than c. Then P1 increments by one and P2 "wraps around".

To illustrate here is a sequence of values, each one incrementing b by 1:

a b c -> P1 P2 P3

30 8190 1048575 -> 3328 1048320 1048575
30 8191 1048575 -> 3328 1048448 1048575
30 8192 1048575 -> 3329 1 1048575
30 8193 1048575 -> 3329 129 1048575
30 8194 1048575 -> 3329 257 1048575

What happens if P1 is set to values between those increments of 128? Equivalently, what if we allow b to be something other than an integer, like 8191.9921875?

30 8191.9921875 1048575 -> 3329 0.0 1048575

This is mathematically valid, does it work? Is there anything in the datasheet or application notes which says we can't do this? Is there any effect on the jitter or other performance?


Re: Modify REV 5 Already Built?

scot forshaw
 

Thanks Guido/Alison. 
Of course I forgot the QCX + can take it too. Good tip.

And guido thanks for the clarification, I assume the instructions you posted in the first rely are all that is needed to carry out ?

Best regards Scot 


On 9 Jun 2020, at 18:57, ajparent1/KB1GMX <kb1gmx@...> wrote:

The QCX+ can also be modded as its the same save for physical changes.

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


Re: 5W HF PA - setting bias current

ajparent1/KB1GMX
 

Any time you power an amplifier there should be a load.
Its a good practices thing and prevents any, oops.

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


Re: Modify REV 5 Already Built?

ajparent1/KB1GMX
 

The QCX+ can also be modded as its the same save for physical changes.

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


5W HF PA - setting bias current

Martin
 

As I understand it, by adding a temporary link to load the DA shift register with 255, I can set the bias point by monitoring the supply current drawn, with no need for any RF drive.

Is this all there is to it? As theres no drive, do I take it that there is no requirement to terminate the output? Or, does the output require at least to 'see' a 50 ohm load?

I will be adding this amp into my 6-band U3S case,

Regards
Martin G7MRV


Re: Shipping FAQ

Mike Besemer - WM4B
 

Looks like one of mine broke loose. The oldest one is still lost in space.

Mike
WM4B

On Jun 9, 2020 9:55 AM, "KI7MWA via groups.io" <entilleser@...> wrote:
Well, perhaps it is my karma... TNT Tracking now says: "Scheduled delivery pending"...whatever that means...