Re: QRSS ARDUINO shield questions

"dd5cf_colin"

--- In QRPLabs@..., Hans Summers <hans.summers@...> wrote:

Hi Colin

If I run the ARDUINO UNO on battery power can I connect it to GND and Vin
(as recommend by the arduino website) through your QRSS shield?
All of the standard Arduino pins are fed through the shield in the standard
way. So if the website recommends that the Arduino can be powered by Gnd
and Vin through a shield, this would apply to the QRSS shield too. But to
be sure: can you provide a link to the part of the website that you are
referring to?

73 Hans

Re: QRSS ARDUINO shield questions

Hans Summers

#1171

Hi Colin?

If I run the ARDUINO UNO on battery power can I connect it to GND and Vin (as recommend by the arduino website) through your QRSS shield?

All of the standard Arduino pins are fed through the shield in the standard way. So if the website recommends that the Arduino can be powered by Gnd and Vin through a shield, this would apply to the QRSS shield too. But to be sure: can you provide a link to the part of the website that you are referring to?

73 Hans

Re: GPS behaviour very inconsistent

Tony Volpe

#1170

Keith,

Could you say more about the battery backup you added? What is the exact voltage on your system? How is it different to what you had before? I have not been able to get my EM-406A to operate with the new kit, but it is working fine on the old one. In my case, the clock will not appear and the kit won't start when I set USE GPS to ON. If I set the invert GPS parameter to invert (which is wrong for the GPS, the clock appears, and the kit starts and will transmit on schedule, but the clock runs fast and within a minute or two is well out of sync with real time. This corrects momentarily when the transmit cycles end and then it runs away again.

If you have found a solution, I'd be well pleased. :))

The kit works well in every other way that I have tried, but I've only been using WSPR.

Tony

G0BZB

Show quoted text

On 20 May 2013 21:43, Keith Maton <nentecular@...> wrote:

?

Since I added battery backup to my GPS module at the weekend things are more consistent.?

When I apply power, the clock shows and it's normally accurate to within a few seconds. ?I put the GPS invert to off and the clock shows correct. ?I put the invert back to on and it stays correct without drifting. I've been running WSPR for over 24 hours on 30m/20m with no problems.

I'm very pleased to have been seen in VK land on 20m WSPR this afternoon.

73 Keith, G6NHU
--

On 17 May 2013, at 10:35, Keith Maton <nentecular@...> wrote:

?

All,

Following on from my other emails yesterday, last night I restarted everything again only this time the U2 and GPS were switched off for an hour or so while I worked GB70DAM on 40m.

Once I started it up and the GPS locked, the clock once again was showing 00:00:00. I inverted the input and the time showed correctly.

Today, over 12 hours later, it's still correct to the second! Compare that to yesterday when it was rapidly losing time.

73 Keith, G6NHU

Re: QRSS ARDUINO shield questions

"dd5cf_colin"

#1169

Hi Hans and Alan,

Thank you both for the information and the links Alan.

Have you any advice for me about question 1 of my last post:

 If I run the ARDUINO UNO on battery power can I connect it to GND and Vin (as recommend by the arduino website) through your QRSS shield?

My contribution to the  "BS170's in new kit PCB's - opinions please?"
post is why not supply a couple of 2N7000's in a seperate bag and those OM's who are not confident about which way round the BS 170's go can have the choice.

73 Colin DD5CF / G1ZOS

Show quoted text

--- In QRPLabs@..., Hans Summers <hans.summers@...> wrote:

Hi Colin

As Alan said, there's a book see  for the
details. People can still build and operate the QRSS Arduino shield without
the book. But the book does contain a lot of other interesting things and
would probably be useful for people who want to learn more. There's a huge
amount of information on Arduino around the internet too.

73 Hans
G0UPL

On Mon, May 20, 2013 at 4:27 PM, Alan <g0rwb@...> wrote:

**

Hans has contributed three chapters, including one on QRSS and one on the
multimode transmitter shield, to the new ARRL book 'Hamradio for Arduino
and Picaxe'. It's well worth a look, it would probably answer your
questions.

If I've read it correctly, switches 1 and 2 give a value from 0 to 3 to
select modes None/QRSS/FSKCW/DFCW, similarly switches 3 and 4 give speeds
of 12WPM/QRSS3/QRSS6/QRSS10.

Loading Arduino sketches into ATtiny chips is covered here:

I think you will need an ATtiny44 or ATtiny84. The 8-pin ATtiny45/85 types
don't have enough pins for this application.

Hope this helps.

Regards,
Alan G0RWB

--- In QRPLabs@..., "dd5cf_colin" <jobaco@> wrote:

Hi Hans and all,

I have a couple of questions about the arduino shield.

1: If I run the UNO battery power can I connect it to GND and Vin (asrecommend by the arduino website) through your QRSS shield?

2: I have looked through the sketch to find out which DIP switch doeswhat but due to my limited knowledge I cant make head or tail of it, can
you tell me the various switch positions / modes? at the moment I have only
switch 1 in the on position this seems to be QRSS 3.

3: I think it must be possible to upload the sketch to a ATtiny chip orsimilar (sorry lack of knowledge again) and breadboard the QRSS shield with
the chip, what sort of chip would I need ?

73 Colin DD5CF / G1ZOS

Re: Ultimate2 kit status summary-GPS

g3zjo

#1168

On 20/05/2013 22:27, Hans Summers wrote:
By 50%, you mean the duty cycle is 50%? If so, this would support my theory that this issue is related to very short pulse widths on some GPS modules.:-) . I don't know, I hoped you would.

PPS < ???25 ns @ 50% was copied from the manufactures data. Its very short, I can't see it on my scope all I can get is a trigger from its leading edge so I knew it was there.

73 Eddie

Re: Ultimate2 kit status summary-GPS

Hans Summers

#1167

Hi Eddie?

> My current theory is that the short pulse width from some GPS modules
> is interfering with, or being interfered by, the incoming serial data
> stream.
The Trimble is stated as PPS < ±25 ns @ 50% and werks beaufull.

By 50%, you mean the duty cycle is 50%? If so, this would support my theory that this issue is related to very short pulse widths on some GPS modules.

73 Hans G0UPL

Re: U2 step tests

g3zjo

#1166

On 20/05/2013 22:07, Hans Summers wrote:
Anyway I don't think we need to lose any more sleep over this stuff. I think I understand the problem adequately now.Hi Hans

Jolly good. Personally I think it shows what we have found with WSR, the results on each U2 are inconsistent, Andy FTD had prety good linearity and my steps are not linear on 3.5MHz. Some of the steps, (now back using your settings and 5.5Hz) give the same no or very tiny shifts on several pairs of steps.
All noted re bucket size but I do it see better the steps and the difference is consistent for each step and repeated accurately.
Anyway irrelevant now if you have the full understanding so looking forward to the sorted version.

73 Eddie

Re: U2 step tests

Hans Summers

#1165

Hi Eddie

?

I have increase the requested steps to 10 Hz total
There are 12 steps in the message
Only 8 discreet steps are present
The total pattern does not achieve the 10Hz expected
Each step will be 0.833Hz
The shift achieved is around 6Hz
8 steps times 0.833 equals 6.666Hz

How did you increase the requested steps to 10Hz total? The FSK (Hz) size parameter is ignored here. In the custom message mode, the size of each step is always 0.5Hz. So if you have 12 steps, it should go from 0 to 5.5Hz always.?

I believe that the observations of only 8 steps being apparent on 3.5MHz are just a feature of the settings you are using in your spectral analysis program. If you changed the settings or used a different program I think that you would see the 12 steps correctly. I think at the settings you have, the resolution of the spectral analysis is limited to a "bucket" size of more than 0.5Hz, which mean you can't observe all the 12 steps accurately.?

Anyway I don't think we need to lose any more sleep over this stuff. I think I understand the problem adequately now. Regardless of whether it is there on 3.5MHz or not, it clearly arises as you go up in frequency and at 10m the steps are much too inaccurate or non-existent. I don't need any more experimental observations now, I think the experiments to date have been extremely helpful.?

Many thanks to Eddie and all those of you who have provided the observations. Now I have to just change the part of the code which calculates the DDS tuning word.?

73 Hans G0UPL

Re: U2 step tests

Hans Summers

#1164

Hi Barry

?

Are you running out of resolution in step size here? What's the actual
min resolution the DDS can give with a 125MHz xtal?

The DDS resolution stated in the AD9850 datasheet is 0.0291Hz with 125MHz reference clock.?

73 Hans G0UPL

Re: QRSS ARDUINO shield questions

Hans Summers

#1163

Hi Colin

As Alan said, there's a book see??for the details. People can still build and operate the QRSS Arduino shield without the book. But the book does contain a lot of other interesting things and would probably be useful for people who want to learn more. There's a huge amount of information on Arduino around the internet too.

73 Hans

G0UPL

Show quoted text

On Mon, May 20, 2013 at 4:27 PM, Alan <g0rwb@...> wrote:

?

Hans has contributed three chapters, including one on QRSS and one on the multimode transmitter shield, to the new ARRL book 'Hamradio for Arduino and Picaxe'. It's well worth a look, it would probably answer your questions.

If I've read it correctly, switches 1 and 2 give a value from 0 to 3 to select modes None/QRSS/FSKCW/DFCW, similarly switches 3 and 4 give speeds of 12WPM/QRSS3/QRSS6/QRSS10.

Loading Arduino sketches into ATtiny chips is covered here:

I think you will need an ATtiny44 or ATtiny84. The 8-pin ATtiny45/85 types don't have enough pins for this application.

Hope this helps.

Regards,
Alan G0RWB

--- In QRPLabs@..., "dd5cf_colin" wrote:
>
> Hi Hans and all,
>
> I have a couple of questions about the arduino shield.
>
> 1: If I run the UNO battery power can I connect it to GND and Vin (as recommend by the arduino website) through your QRSS shield?
>
> 2: I have looked through the sketch to find out which DIP switch does what but due to my limited knowledge I cant make head or tail of it, can you tell me the various switch positions / modes? at the moment I have only switch 1 in the on position this seems to be QRSS 3.
>
> 3: I think it must be possible to upload the sketch to a ATtiny chip or similar (sorry lack of knowledge again) and breadboard the QRSS shield with the chip, what sort of chip would I need ?
>
> 73 Colin DD5CF / G1ZOS
>

Re: GPS behaviour very inconsistent

Keith Maton

#1162

开云体育

Since I added battery backup to my GPS module at the weekend things are more consistent.?

When I apply power, the clock shows and it's normally accurate to within a few seconds. ?I put the GPS invert to off and the clock shows correct. ?I put the invert back to on and it stays correct without drifting. I've been running WSPR for over 24 hours on 30m/20m with no problems.

I'm very pleased to have been seen in VK land on 20m WSPR this afternoon.

73 Keith, G6NHU
--

Show quoted text

On 17 May 2013, at 10:35, Keith Maton <nentecular@...> wrote:

?

All,

Following on from my other emails yesterday, last night I restarted everything again only this time the U2 and GPS were switched off for an hour or so while I worked GB70DAM on 40m.

Once I started it up and the GPS locked, the clock once again was showing 00:00:00. I inverted the input and the time showed correctly.

Today, over 12 hours later, it's still correct to the second! Compare that to yesterday when it was rapidly losing time.

73 Keith, G6NHU

Re: U2 step tests

g3zjo

#1161

On 20/05/2013 07:56, Hans Summers wrote:
I think that at 80m, some of what you observe is just features of the decode process on such a strong signal. Can you put in some attenuation so that the line is thinner?Well I am still trying to make 8 beans equal 12. No matter how yo look at it there are only 8 distinct levels on 3.5MHz

Eddie

Re: QRSS ARDUINO shield questions

"Alan"

#1160

Hans has contributed three chapters, including one on QRSS and one on the multimode transmitter shield, to the new ARRL book 'Hamradio for Arduino and Picaxe'. It's well worth a look, it would probably answer your questions. 

If I've read it correctly, switches 1 and 2 give a value from 0 to 3 to select modes None/QRSS/FSKCW/DFCW, similarly switches 3 and 4 give speeds of 12WPM/QRSS3/QRSS6/QRSS10.

Loading Arduino sketches into ATtiny chips is covered here: 

I think you will need an ATtiny44 or ATtiny84. The 8-pin ATtiny45/85 types don't have enough pins for this application.

Hope this helps.

Regards,
Alan G0RWB

Show quoted text

--- In QRPLabs@..., "dd5cf_colin" <jobaco@...> wrote:

Hi Hans and all,

I have a couple of questions about the arduino shield.

1: If I run the UNO battery power can I connect it to GND and Vin (as recommend by the arduino website) through your QRSS shield?

2: I have looked through the sketch to find out which DIP switch does what but due to my limited knowledge I cant make head or tail of it, can you tell me the various switch positions / modes? at the moment I have only switch 1 in the on position this seems to be QRSS 3.

3: I think it must be possible to upload the sketch to a ATtiny chip or similar (sorry lack of knowledge again) and breadboard the QRSS shield with the chip, what sort of chip would I need ?

73 Colin DD5CF / G1ZOS

Re: Silk screen drawings

Leigh L Klotz Jr WA5ZNU

#1159

I started the 2n7000 wikipedia page!

Leigh/WA5ZNU

Show quoted text

On May 19, 2013 11:39 PM, "g3zjo" <g3zjo@...> wrote:
> To quote from Wiki:-
>
>> The 2N7000 and BS170 are N-channel, enhancement-mode MOSFETs used for low-power switching applications. The two are nearly identical except that the leads are arranged differently and the current ratings are somewhat different

QRSS ARDUINO shield questions

"dd5cf_colin"

#1158

Hi Hans and all,

I have a couple of questions about the arduino shield.

1: If I run the UNO battery power can I connect it to GND and Vin (as recommend by the arduino website) through your QRSS shield?

2: I have looked through the sketch to find out which DIP switch does what but due to my limited knowledge I cant make head or tail of it, can you tell me the various switch positions / modes? at the moment I have only switch 1 in the on position this seems to be QRSS 3.

3: I think it must be possible to upload the sketch to a ATtiny chip or similar (sorry lack of knowledge again) and breadboard the QRSS shield with the chip, what sort of chip would I need ?

73 Colin DD5CF / G1ZOS

Re: U2 step tests

g3zjo

#1157

On 20/05/2013 08:43, Barry Chambers wrote:
Are you running out of resolution in step size here? What's the actual
min resolution the DDS can give with a 125MHz xtal?I think it is more like 0.08Hz min

I have reduced signal level and the blow up of the width, Thing is I cant write on those.:-)

There is an anomaly repeated every time on steps 6,7 and 12 where the actual width of the signal is greater this can be seen by the with of the waterfall peak (if you guys looking at  capture are lucky enough to catch it) is the DDS indecisive trying to achieve a freq and deviating (aliasing)?

Another way of observing is to watch the time spent at each frequency by the waterfall peak, I can do that of course and can see the double time at some steps. Also I can see the wide peak at 6,7 which stays on the same freq for twice the unit time.

Eddie

Re: U2 step tests

Barry Chambers

#1156

On 20/05/2013 08:32, g3zjo wrote:
On 20/05/2013 07:56, Hans Summers wrote:
I think that at 80m, some of what you observe is just features of the
decode process on such a strong signal. Can you put in some
attenuation so that the line is thinner?

I think the tone spacing is probably Ok on 80m, once you do that. The
problems come in, at the higher bands where too much precision is lost.
Hi Hans

The wide line is due to the resolution which I have pushed up, to make
it clearer in fact. Yes there is some inevitable spread. Of course I
will add some attenuation for you and see what I can do.
However please observe and consider:-

I have increase the requested steps to 10 Hz total
There are 12 steps in the message
Only 8 discreet steps are present
The total pattern does not achieve the 10Hz expected
Each step will be 0.833Hz
The shift achieved is around 6Hz
8 steps times 0.833 equals 6.666Hz

I am glad I did the test then I was not sure at what stage you were at
in the solution.

73 Eddie


------------------------------------

Yahoo! Groups Links


Hans, Eddie

Are you running out of resolution in step size here? What's the actual min resolution the DDS can give with a 125MHz xtal?

-- 

73

Barry, G8AGN

Re: U2 step tests

g3zjo

#1155

On 20/05/2013 07:56, Hans Summers wrote:
I think that at 80m, some of what you observe is just features of the decode process on such a strong signal. Can you put in some attenuation so that the line is thinner?

I think the tone spacing is probably Ok on 80m, once you do that. The problems come in, at the higher bands where too much precision is lost.
Hi Hans

The wide line is due to the resolution which I have pushed up, to make it clearer in fact. Yes there is some inevitable spread. Of course I will add some attenuation for you and see what I can do.
However please observe and consider:-

I have increase the requested steps to 10 Hz total
There are 12 steps in the message
Only 8 discreet steps are present
The total pattern does not achieve the 10Hz expected
Each step will be 0.833Hz
The shift achieved is around 6Hz
8 steps times 0.833 equals 6.666Hz

I am glad I did the test then I was not sure at what stage you were at in the solution.

73 Eddie

Re: U2 step tests

Hans Summers

#1154

Hi Eddie

I think that at 80m, some of what you observe is just features of the decode process on such a strong signal. Can you put in some attenuation so that the line is thinner?

I think the tone spacing is probably Ok on 80m, once you do that. The problems come in, at the higher bands where too much precision is lost.

73 Hans G0UPL

Show quoted text

On Mon, May 20, 2013 at 7:50 AM, g3zjo <g3zjo@...> wrote:

?

Hans / Lads

I have increased the resolution of my Grabber
for clearer
understanding of the step tests. Currently on 3.5MHz band and the
frequency indicated.

The 3.5MHz band produces decodeable WSPR but the shift is not correct. I
have annotated a blow up of the steps which is attached and will be in
my Group Folder.

73 Eddie G3ZJO

U2 step tests

g3zjo

#1153

Hans / Lads

I have increased the resolution of my Grabber  for clearer understanding of the step tests. Currently on 3.5MHz band and the frequency indicated.

The 3.5MHz band produces decodeable WSPR but the shift is not correct. I have annotated a blow up of the steps which is attached and will be in my Group Folder.

73 Eddie G3ZJO