Date   

Pico Balloon Launch LightAPRS N6CVO-11

BrianB
 

We launched a balloon this morning and it came to life once the sun came up. What a way to celebrate the moon landing anniversary. Woo hoo...

https://aprs.fi/#!call=a%2FN6CVO-11&timerange=604800&tail=3600

BrianB
N6CVO


Re: i was dreaming

Alan de G1FXB
 


Perhaps consume some cheese at bedtime,
it may make the time fly by?

With each sleep,
the QSX becomes a day nearer becoming a reality.?


Alan

On 18/07/2019 22:31, Mike wrote:
On 18 Jul 2019 at 14:09, Mike wrote:

I  was dreaming in morse last night. The other station was sending quite
badly 
and I was trying to hear him through the qrm on 40m. I thought he was sending
GDAD, GD1D with cw abbreviations for the 1, but he kept repeating his
callsign 
over and over again. In the end I gave up and in my dream qsy'ed somewhere 
else.
When I woke up The cw was clear in my mind, he was sending QSX.
No wonder I did'nt get it.....

QSX was just a dream..................





Re: clear tape on GPS kit chip

Stephen
 

thanks. i wasn’t sure if any soldering nearby would bother the tape
--
Stephen - AC2GW


Re: 5watt amp/u3s

Alan de G1FXB
 

Hi Paul,
Yep, Still pull C5
In doing so you create a breakout point for the PA.

Hans recommends using one of the conveniently positioned vacant Q3 BS170 pads where you can find RF and GND connection both close by and send it to the PA input.

PA output gets patched back onto the U3S
Hans suggests RFI and the adjacent GND pads where amplified RF now gets routed into the inbuilt LPF position
and 10 way backbone connector for the expansion LPF positions if fitted, as normal.

As you noted, over time AN004 layouts have not kept up with the PCB revisions.
Not a show stopper the pads are still there, just not exactly in the same place.

Alan


On 20/07/2019 00:13, m0bmn via Groups.Io wrote:

?

Think I have just realised how this is done, a zoom in on the newer PCb shows? on the 10 way (5 x2) socket

GND/RFI and GND/RFO which are the connections I need I guess. Do I still chop c5 as before.

73 Paul

Sent from Mail for Windows 10

?


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Re: clear tape on GPS kit chip

Chris Wood
 

Stephen

My QLG-1 had the tape over the pre-fitted GPS chip.  Left in place, works fine.

Chris
G4CWS


Re: clear tape on GPS kit chip

Alan de G1FXB
 

The description of a chip is confusing, other than the pre mounted GPS module the PCB is bare.

The GPS Antenna has adhesive tape to affix allowing easy soldering if you choose the inbuilt antenna option.
see pages 6 & 7 of the assembly manual.
Is this what you are describing?




Alan



On 20/07/2019 13:18, Stephen wrote:
i just got my gps kit. ?looking at the board, it looks like the premounted chip has clear adhesive tape on it as if holding it to the board.

should i remove it or leave it?
--
Stephen - AC2GW


Re: i was dreaming

John Rabson
 

I recently came across a French car whose registration ended in “QRX 75” and another one which contained the letters “QRM”.

John F5VLF

On 20 Jul 2019, at 13:33, CW Morse <RadioPrinceGeorge@...> wrote:

sounds more like QSZ over here


clear tape on GPS kit chip

Stephen
 

i just got my gps kit.  looking at the board, it looks like the premounted chip has clear adhesive tape on it as if holding it to the board.

should i remove it or leave it?
--
Stephen - AC2GW


Re: i was dreaming

CW Morse
 

sounds more like QSZ over here


Re: QCX components needed for latest hardware revision.

Paul Galburt - K2AYZ
 

I just ordered some random parts I can use from Tayda to see how they perform. Shipping was $2 which is VERY good.

Thanks for the hint,

73, Paul K2AYZ


5watt amp/u3s

m0bmn
 

 

Think I have just realised how this is done, a zoom in on the newer PCb shows  on the 10 way (5 x2) socket

GND/RFI and GND/RFO which are the connections I need I guess. Do I still chop c5 as before.

73 Paul

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U3S and 5 watt amp Kit

m0bmn
 

Hi All

 

Just a daft question, I am sure its me (it normally is!)

Just looking how the 5 watt amp connects to the u3s,the PCB for the u3s in the instructions is a 2014 board with a different layout, is there a sketch showing where the rf from the amp connects back to the u3s and where to take the higher power filtered output from the u3s board.

Thanks in advance

Paul

 

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Re: 20 meter QCX-- 1/2 watt output

Axel
 

Michael, did you solve the problem?

I measured the square wave voltages on IC3 at key down:
Pin3: 5.0 V
Pin4: 3.5 V

I have 2.9 W out at 13.5 Vdc. 20 m. I had to replace C25 and C26, same value (390 pF), NP0.

Do you have ~12 V supply voltage even on key down?
If you want to replace IC3: I found a toothpick very helpful in removing the solder out of the holes.
I use a cheap socket for IC3 without problems.

73
Axel, DF1ET


Re: ProgRock not working #progrock

Robin Midgett
 

Hi Hans,
The inverter & level shifter are the same stage..a simple 2N3904. The shifter is needed to bring the 2.8V logic 1PPS from the GPS to 5V logic level, and the coincidence is that it's inverted logic is needed by the input to the 555. Propagation delay for a 2n3904 is specified in the 40nS range. There are no caps on this stage.

There is a latency associated with the 555 and that's the time shown in the oscilloscope photograph in my previous post. That latency scales with the chosen RC value for the 555 one shot. In that photo I was using 10uF & 10K which gave a ~110mS pulse width.

You'd indicated in an earlier email exchange that the minimum acceptable pulse width of the 1PPS ProgRock input is unknown. I'm experimenting with different RC values on the 555 & can report that, latency issues notwithstanding, 14mS seems to work well thus far, using 1uF & 10k on the 555.

Yes, I suspect the QLG1 will make my ProgRock work properly.
Thanks,
Robin Midgett K4IDC


On Fri, Jul 19, 2019 at 1:37 AM Hans Summers <hans.summers@...> wrote:
Hi Robin

If you have an inverter in there as well... then that's also a problem :-/     The leading edge of the 1pps from the GPS is the one that is considered accurate. There's no guarantee about the trailing edge. 

If there was a latency that was fixed precisely, then all would be well. But if you have Resistors and Capacitors in there that are generating the stretching, and triggering off the wrong edges... then all bets are off.... 

I suspect that when you get your QLG1 you will find all works as expected. 

73 Hans G0UPL

On Thu, Jul 18, 2019 at 6:24 PM Robin Midgett <K4IDC@...> wrote:
Hi Hans,
Do you mean like this? :>)
This morning the error at 16.686600 MHz was 14 Hz. In other words, I set register 8 to 16,686,614 to obtain a measured output of 16,686,600. Doubling that output frequency resulted in a doubling of the error, doubling again, same error factor. Then I set about measuring the latency...probe 1 is the output of the level shifter/inverter stage that is connected to the input of the 555. Probe 2 is the 555 output.



Now....what to do about it? Perhaps a pulse stretcher with a Schmitt trigger input? 
I'm more of an analog guy, so this experience is really helping me learn. This is fun!
Thank you, Hans! 
Thanks,
Robin Midgett K4IDC


On Wed, Jul 17, 2019 at 10:40 PM Hans Summers <hans.summers@...> wrote:
Hi Robin

Is there a possibility your 555 pulse extender circuit could also be adding variable latency to the pulse? It would not take very much error... bear in mind, every 1us is 1 part-per-million error at the output. 

Anyway it will be interesting to see how things go once you get your QLG1

73 Hans G0UPL

On Thu, Jul 18, 2019 at 12:44 AM Robin Midgett <K4IDC@...> wrote:
Hi Hans,
Thanks for the response.
I'd really like to understand what's causing this issue & what to do about it.
Presently I have the Trimble GPS 1PPS 2.8V logic 1mS pulse driving a level shifter to a 5V logic level and also providing the needed inversion for driving a non-retriggerable 555 one shot. The 555 is giving a 112mS long positive going 5volt pulse for every 1PPS from the Trimble GPS. I'm applying the 112mS pulse to the GPS input on the ProgRock. In this configuration, register 2 is being updated to a value that causes the output frequency to run low of the desired by ~18 Hz.
If I remove the 1PPS, ground the 1PPS input on the ProgRock & reboot the ProgRock, then manually dial in register 2 to give the proper output frequency, it'll stay there within a couple of Hz. over a period of many hours if not days, thermal effects not withstanding.
It seems to me that under GPS discipline the frequency of the crystal is being mis-read, or there's some magic in register 28 that needs to be adjusted; these are my guesses at this point.

My primary reason for the 555 is to allow me the opportunity to experiment with different pulse widths. Since the QLG1 gives 100ms, I started with a value near that. I can trim it to be spot on later, but 112mS is where my particular RC value came to land late last night. I know from experience that 1mS doesn't work, nor does 11mS, at least not as my ProgRock sits currently.

My QLG1 and the OCXO from QRPLabs are in the mail. Once I have those we can see if anything changes. If you have any further suggestions, I'm all ears.

Thanks,
Robin Midgett K4IDC


On Mon, Jul 15, 2019 at 3:33 PM Hans Summers <hans.summers@...> wrote:
Hi Robin, Graham, Sid, all

There have been a lot of posts on this topic and being on vacation at the moment I kind of lost track of where this got to.

ProgRock should work as advertised on the web page and documentation. If it doesn't, something is wrong. 

A GPS disciplined ProgRock should be accurate well within 0.05ppm (note that this parts-per-million specification means that the absolute precision in Hz, scales with frequency). This is what I have seen in all my tests and has been verified by other constructors too. To get the system working does require:

1. GPS correction threshold register must he understood properly. To get maximum precision requires setting the GPS correction threshold register to zero (default is 5Hz). 

2. The 1pps signal needs to be at 5V logic level. Many GPS units have 2.8V logic level outputs and need level conversion. This can be done with pull-up resistors with some care and some inevitable degradation in noise immunity. Or with proper level conversion.

3. The GPS pulse needs to be long enough for the processor to handle it properly. I'm not actually sure what the minimum is. Many common modern GPS modules have 0.1 second positive pulses, these work fine. Some modules with very short pulses e.g. 1 microsecond wouldn't work.

Note that the QRP Labs QLG1 GPS kit http://qrp-labs.com/qlg1 was used in all my testing and works very well. It has 0.1 second positive pulse and it has proper logic level conversion. The QLG1 has a very accurate 1pps specified with max 11 nanosecond r.m.s error.

If the ProgRock isn't performing as expected then something is wrong. That could be an electrical problem (soldering problem, dead component etc); or some issue with the characteristics of the 1 pulse-per-second signal input. 

If there's any question I haven't covered here, please let me know.

73 Hans G0UPL 







On Mon, Jul 15, 2019, 16:31 Robin Midgett <K4IDC@...> wrote:
Hi Graham & the group,
The issue Sid & I and possibly others who aren't reading the mail on this subject isn't about stability with the TCXO or OCXO. The stability with those optional oscillators is well documented and not in question, and for a broad range of applications, mine included, well more than sufficient.
The issue here is making the ProgRock work reliably with GPS discipline, and why that isn't happening reliably.
Diatribes about the NEED for GPS discipline in anyone's application are irrelevant simply because the fact is the product doesn't perform reliably as advertised with GPS discipline, and, very importantly, within the context of kit building and the price of the kit, this is not a deal breaker or terribly surprising. This is part of the value of kit building; the builder has the opportunity to improve the kit as they see fit, or not.
What is perhaps more interesting and worth studying is why the GPS discipline isn't as reliable as it should be, and what's to be done to mitigate that deficiency. Based on the current responses to our (Sid & my) posts, Hans may be the only person qualified to really answer the questions regarding the apparent deficiency.
Further, personal attacks are not helpful, Andy Brilleaux. Let's leave those for the elementary school playground. Let's approach this issue scientifically and see if a successful solution can be had. I suspect it can and will.
Thanks,
Robin Midgett K4IDC


On Sun, Jul 14, 2019 at 3:15 PM Graham W <gram.warrington@...> wrote:
I have built a few prog rocks. I did not use the 27 mhz crystal as supplied, but installed a TCXO as suggested in the manual. I find ,even without GPS control that it is very stable. The pads are already there for the TCXO.
Graham VE3WGW


Re: i was dreaming

Don--AE4DW
 

It would have been real torture if part of that dream had you opening the mailbox to find an unexpected package from Turkey.


Re: Help ! My U3S behaves badly.... #u3s

Don--AE4DW
 

Glad to see you got a few steps closer to the root cause.

Could you possibly have the pin 25 lead being shorted to ground somewhere in the case (is it metal?) at the connection point to the switch? Or a strand of wire (difficult to see..) between the terminals of the switch giving you that constantly-closed state?  Not sure whether the switch is mounted in your case, or removed, but I'd be curious if you still had the issue with the button removed from the case, the two leads to the switch free and clear of anything.

It sounds like the switch is fine, but its always easy to replace it with a new one to confirm. 


Re: Keyer Issue with QCX - missing or short dahs

Rex Vokey
 

More like, "my hammer won't hit certain types of nails—what gives?!"


Re: ProgRock not working #progrock

Robin Midgett
 

Hi Floyd,
Yes, most certainly. That's the value of these email groups. I've benefited many times by this sort of participation in other groups and value the follow up very highly.
Thanks,
Robin Midgett K4IDC


On Fri, Jul 19, 2019 at 6:04 AM Floyd Hollister <fhh11@...> wrote:
Robin,  I have been following along and will be interested in the final solution. Could you continue to keep the group informed to the end?  Thanks Floyd


Re: ProgRock not working #progrock

Floyd Hollister <fhh11@...>
 

Robin,  I have been following along and will be interested in the final solution. Could you continue to keep the group informed to the end?  Thanks Floyd


Re: subscribe

geoffrey pike
 

Looks as though you are doing it!
cheers
Geoff
GI0GDP

On Friday, 19 July 2019, 11:02:16 BST, Gerald Ball via Groups.Io <gerryball2@...> wrote:


I would like to send messages to this group. regards gerry


--
gerry