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Re: would like a dialog on packaging of qrss high stability transmitters

Arv Evans
 

开云体育

Stan AK0B

Some time ago a couple of us were discussing something similar, but using QRSS beacons with GPS
for launching in ocean currents to see where they go.? Our approach was to use 3 inch diameter
PVC drain pipe as the chassis with 3 inch pipe caps glued onto each end.? Adding a battery pack
at one end would keep them floating upright so an antenna on the opposite end would be above
water most of the time.? With a reducer fitting the antenna could be installed inside a length of
smaller PVC pipe for a fully water-tight system.? This discussion progressed to talking about wave-
action charging and possibility of sending commands to an accompanying receiver for remote
control, including wave-action propulsion and associated navigation.
This then led to the absurd, like making a geo-cache that floated around in the ocean.

Your glass bottle might lend itself well to battery charging via an internal solar cell if you leave
one side exposed to the sun.? With microprocessor control you could make it sense battery
charge and turn on only when there is adequate power for at least one ID sequence.? ID could
also include telemetry information like temperature, battery state, solar intensity, wind speed,
and so on.

Arv K7HKL
_._


On 07/31/2011 01:47 PM, w9ifz wrote:

?

I would like to share ideas on packaging.

I am in the process of building a qrss transmitter which I will put into a square glass bottle I obtained from Lobby Hobby. The bottle mouth is 2 inches and the holding area is 3 inches high. It has a combination aluminum and plastic lid.

I plan to use an F fitting for the antenna connection. Much cheaper than BNC or UHF and they work very well it crimped correctly.

I have mixed feeling about if I will use a heater on the xtal or not. Since the entire board would not be in any draft condition.

I am also thinking about filling the bottle with glass beads after I install the transmitter. Makes a good heat sink I think.
Can not decide if I will paint the inside of the bottle black or not. I am considering the inside black with the outside silver.

All power supply components will be outside the bottle and may or may not be on the top of the lid. Initially will not be on the lid.

I will add a wood box with the pink foam installation between the bottle and the wood.

I long term goal is to build something super stable and to bury it in the yard.

Interested in your thoughts and suggestions,

Thanks, Stan AK0B
would like a dialog on packaging of qrss high stability transmitters

"w9ifz"
 

I would like to share ideas on packaging.

I am in the process of building a qrss transmitter which I will put into a square glass bottle I obtained from Lobby Hobby. The bottle mouth is 2 inches and the holding area is 3 inches high. It has a combination aluminum and plastic lid.

I plan to use an F fitting for the antenna connection. Much cheaper than BNC or UHF and they work very well it crimped correctly.

I have mixed feeling about if I will use a heater on the xtal or not. Since the entire board would not be in any draft condition.

I am also thinking about filling the bottle with glass beads after I install the transmitter. Makes a good heat sink I think.
Can not decide if I will paint the inside of the bottle black or not. I am considering the inside black with the outside silver.

All power supply components will be outside the bottle and may or may not be on the top of the lid. Initially will not be on the lid.

I will add a wood box with the pink foam installation between the bottle and the wood.

I long term goal is to build something super stable and to bury it in the yard.

Interested in your thoughts and suggestions,

Thanks, Stan AK0B
Kit Availability/Orders

Stephen Farthing
 

Hi Guys,

I am sorry that some kits have been out of stock for a little while and that some orders have gone missing in the post. A rush of orders from Sweden depleted stocks and I had to go away at short notice on family stuff which delayed restocking. My apologies for this.?

The good news is that 200 PCBs arrived this morning and I have sufficient stock to kit 40 and 80 meter beacons within the next couple of days. I am awaiting 1,000 30 meter crystals from a supplier in the USA. I hope they will be here in the next 2 weeks then I'll kit 30 meter beacons and send out the kits for those people who changed their orders to 30 m beacons.?

The postal service here is normally pretty reliable. But just lately some orders have been lost. If your order does not arrive please get back to me and I'll ship you a new one and seek compensation from them here.?

Hans is currently working an 80 hour week so has little time to devote to developing the RX kit. Watch this space for future announcements about it.?

Thanks for your patience.

73s Steve G0XAR



--
It is vain to do with more that which can be done with less.
Re: Logging software

"Philip"
 

Sorry folks
Posted this on the wrong group...

Senior moment

--- In QRPLabs@..., "Philip" <pcteee@...> wrote:

Hi folks
Just getting back into ham radio after a 16 year break.
Having fun using my recent build of an MKARS80 into a half wave dipole.

Not familiar with most of the ham radio software but need a decent virtual logbook...

Any recomendations or what do you use?

Thanks

Regards
Philip G4JVF
Logging software

"Philip"
 

Hi folks
Just getting back into ham radio after a 16 year break.
Having fun using my recent build of an MKARS80 into a half wave dipole.

Not familiar with most of the ham radio software but need a decent virtual logbook...

Any recomendations or what do you use?

Thanks

Regards
Philip G4JVF
Re: looking for a couple of 10.140 MHz xtals

Stephen Farthing
 

Hi Stan,

If you can wait for a few weeks I hope to have stock in the ?shop at a reasonable price. I am having 1000 made in the USA. I ordered them a while back and i hope they will be shipped soon.

Expanded Spectrum Systems in the USA sell them but they are quite expensive. Nick at Genesis Radio in Oz mat have some left. I used to buy from him but he was also having problems sourcing them.?

Hope this helps,


73s Steve G0XAR?

--
It is vain to do with more that which can be done with less.
Re: looking for a couple of 10.140 MHz xtals

cvest@...
 

ESS has them at :


Usual disclaimer , just a satisfied customer .

Charlie , W5COV
---- w9ifz <w9ifz@...> wrote:

can anyone point me to a source?
Thanks, Stan ak0b
looking for a couple of 10.140 MHz xtals

"w9ifz"
 

can anyone point me to a source?
Thanks, Stan ak0b
Re: QRSS grabber network?

Clayton G
 

Hi All,

Thank you to all those that responded. It sounds like there is an interest in the idea and some people willing to contribute.

I'm working on some more sample server software, and will then sort out the magazine article. I will put the system onto my website so that those interested can see the system details and we'll see where we can go from there. I'll try to get this done by mid July.

I think everybody's questions are actually covered in the design contest documents (), but if you have a question not covered here, please ask.

Again, thank you for the interest ?;-)

Clayton
VK1TKA/ZL3TKA


On 7 June 2011 21:21, Clayton G <clayton@...> wrote:
Hello Knights!
?
I didn't get much response to my email last month, but I'll try another tact before giving up.
?
For a while I've had an idea of developing a server system with remote 'thin' receivers around the world. These receivers would send in their sample data of a narrow QRSS band to the server, which would then generate a worldwide view of the signals being grabbed. Data could also be logged and overlays generated etc etc - it is kind of like the WSPR net but for visual MEPTs. At minimum it would allow for a worldwide instant display of activity with the ability to roll back in time.
?
Anyway I implemented the 'thin' receiver for a design contest, and got among the winners. Subsequently the magazine (Circuit Cellar) has asked if I'd like to turn my project into a published article. As I'd get paid for this, it could be a source of seed funds to make the QRSS network a reality.
?
The real question though is do the Knights think such a network is of value, or do you find the aggregators and ad-hock grabbers sufficient? Personally I found it inadequate when I was running my MEPT, but this is in part due to the solar power and low duty cycle of my MEPT - I had to watch at just the right time to see it.
?
The other benefit of the network is the ability to expand the grabber base. As the receivers will be cheap (I think the component cost can be as little as $50) and not require a PC or anything (only a power source, antenna and internet connection) more operators should be able to install them.
?
What do you think???
?
Clayton
VK1TKA/ZL3TKA
?
----- Original Message -----
From: Clayton G
Sent: Thursday, May 05, 2011 10:52 AM
Subject: QRSS grabber receiver & server project

I recently entered a design project with a QRSS application. I was luck to get amount the winners with my entry. See:


The project was a small (and hence cheap) receiver (a SDR) and DSP processor + ethernet interface. The idea is that with these receivers doted around the world sending their small bandwidth of sample data to a central server we could get a central webpage to a worldwide network of grabber receivers (much like the WSPR network manages the WSPR spots). My project was the receiver end of the project only - the server itself was beyond the scope. The receiver used a cheap GPS module to calibrate its internal?oscillator?and hence obtain frequency accuracy (with the central server doing the necessary calculations and managing this).

The hope was to be able to build the receiver for < $100, with the only need beyond that being the power supply, antenna, and ethernet connection (ie no radio or computer required). I got the basics working, but there is still plenty of scope to improve the receiver (such as reduction of the amount of data transferred - currently it would use about 3.5GB/month), sort out the receiver design PCB etc, and to get the server operating to accept the data and manage the receivers.

Anyway, the details are in the entry documents on the website above. I would love this project to move beyond just this contest entry. Is anyone interested in being part of such a project. The main need at present is someone to take on the server side, and a suitable place to host it; although receiver work is also required. Anyone interested? I'm a bit tied up with other project at present, but can do some more work on the receiver.

Regards
Clayton
VK1TKA/ZL3TKA
QRSS-3 on 1014004 Mhz de IK6ZEW TESTING 100mW

"Fabrizio"
 

Now I'm on air for a few days, I'm testing the station. Reception reports are welcome, you can e-mail me a screenshoot of the reception and other information about your radio station. I thank you very much for your information about my weak signals.Actually position towards dipole is N-S, at power tx is 100mW +/-!!
ik6zew@...
10.1400050 MHz

"vk5djw"
 

Hi All,

I am currently transmitting My call sign (VK5DJW) in QRSS3 from an inverted V dipole I set up the Hans Summers QRSS kit today using a calibrated frequency counter at work. it was a Racal Dana 1992 if anyone is interested.

Would appreciate if anyone lets me know any reports. if they have a chance. I will leave it on and check out some nearby grabbers.

-Dan
Re: QRSS grabber network?

"javeaflat"
 

Clayton,
I downloaded the receiver project and it looks good, congratulations on your win.

I have a few websites I look after although I have retired from full time work but there should be space enough on my hosting account to do this.
I have some experience with MySQL database development and could knock up a db to store the information from each grabber and write php scripts to add it and display it on a page(s).

I have not looked at the firmware for the MBED as yet but presumably
it could send the parameters back to the server as a get command string similar to that which can be produced when a form is completed on a web page, I say this because I am familiar with form handling and would be able to interface this with the database without too much problem.

Ian M0BXR

What do you think???

Clayton
VK1TKA/ZL3TKA

----- Original Message -----
From: Clayton G
To: knightsqrss@...
Sent: Thursday, May 05, 2011 10:52 AM
Subject: QRSS grabber receiver & server project


I recently entered a design project with a QRSS application. I was luck to get amount the winners with my entry. See:






The project was a small (and hence cheap) receiver (a SDR) and DSP processor + ethernet interface. The idea is that with these receivers doted around the world sending their small bandwidth of sample data to a central server we could get a central webpage to a worldwide network of grabber receivers (much like the WSPR network manages the WSPR spots). My project was the receiver end of the project only - the server itself was beyond the scope. The receiver used a cheap GPS module to calibrate its internal oscillator and hence obtain frequency accuracy (with the central server doing the necessary calculations and managing this).


The hope was to be able to build the receiver for < $100, with the only need beyond that being the power supply, antenna, and ethernet connection (ie no radio or computer required). I got the basics working, but there is still plenty of scope to improve the receiver (such as reduction of the amount of data transferred - currently it would use about 3.5GB/month), sort out the receiver design PCB etc, and to get the server operating to accept the data and manage the receivers.


Anyway, the details are in the entry documents on the website above. I would love this project to move beyond just this contest entry. Is anyone interested in being part of such a project. The main need at present is someone to take on the server side, and a suitable place to host it; although receiver work is also required. Anyone interested? I'm a bit tied up with other project at present, but can do some more work on the receiver.


Regards
Clayton
VK1TKA/ZL3TKA
Re: QRSS grabber network?

Daniel Wiering
 

Sounds like a good idea in principle perhaps share some more info with us ?
Re: [Knightsqrss] QRSS grabber network?

Clayton G
 

It looks like I've set the world on fire - or at least a few Knights! Thanks for the feedback.

To answer a few questions:

The details of my receiver can be found in my design entry at:

I am however further developing the software including improving my test server application.

The receiver sends raw sample data. This is currently IQ sample data at about 600SPS, but there is some work needed to optimise this - sampling rules indicate it could be a lot lower. I think it works out to about 3.5GB per month, which could be an issue for those of us with data limits (which is the usual case here in Australia). I think there is still plenty of scope for data compression to keep the traffic down. I don't think the CPU would have the processing power to perform the actual FFT operation.

My intention was to use a VPS (virtual private server) service to host the network. Some of these services are available for <$10 per month. I have yet to follow up with such services to see if the system is compatible. A donation button on the website would help fund the system.

However the network is not something I can tackle alone. As much as I'd like to, I'm current knee deep (or more like neck deep) in KiwiSAT development so my spare hobby time is limited. I can probably address the design and firmware needed for the receivers, but someone to help with the server is needed.

My idea for data presentation was a web pages with rows of images (one per receiver) showing activity over the past hour or so. Smaller images would be shown by default, with the option to enlarge for more detail. If we have a large number of receivers we could have limited stations shown on the home page by removing locations that are near each other.

The server would also have the ability to manage receivers, including the ability to upgrade firmware. Receivers can therefore be set and forget in operation.

I still have a lot of unanswered questions and ideas, but if there are a few people interested in helping build such a system, I'm willing to do my part and make it happen!

Clayton



On 8 June 2011 06:49, Soeren Straarup <xride@...> wrote:
Hi Clayton and other knights,

On Tue, 7 Jun 2011 21:21:26 +1000
"Clayton G" <clayton@...> wrote:

> The other benefit of the network is the ability to expand the grabber
> base. As the receivers will be cheap (I think the component cost can
> be as little as $50) and not require a PC or anything (only a power
> source, antenna and internet connection) more operators should be
> able to install them.
>
> What do you think???

YES..

Do you have any of the idea's online? schematics, flowcharts/box
drawings?

Though i don't have much time, i might be able to fidn some time for
this (8

After all i tend to call QRSS the familly friendly part of hamradio (;

Set it up and wait.

Though i totally agree more grabbers are needed.

Though the price of making it and running it is up there.

Somethings that could be done without a computer and dirrectly
connected to the net would be nice.

What data would be exchanged between "server(s)" and clients?

Raw streams or more like the "premade" pictures?

vy 73 de OZ2DAK, Soeren

--
Soeren Straarup ? | aka OZ2DAK aka Xride
FreeBSD committer | FreeBSD since 2.2.6-R
?If a program is not working right, then send a patch
Re: QRSS grabber network?

Arv Evans
 

开云体育

Clayton VK1TKA/ZL3TKA

I too have proposed new things for QRSS, only to find a strong view that
"we don't do it that way" which resists change and new ideas.

Your idea does have merit, and some spin-off capabilities that could be
used to further enhance the ability and usefulness of QRSS as a serious
communication mode.

At risk of sounding like one of the nay-sayers, here are my thoughts regarding
your proposed system:
  • Go ahead and do it, even if the Luddites don't want to participate.
    If it catches on they will come around, and probably claim that they
    invented it.

  • Receivers can be constructed for very much less than your figure.
    An SA612 IC costs less than USD $3.00 from Chinese sources.
    A single 2N2222A following the SA612 gives AF levels sufficient
    for driving the PC audio input.? Crystals for QRSS frequencies can
    be either cheap or expensive, depending on which QRSS band is
    being received.

  • It will be difficult to determine which band the centralized signal is
    coming from unless the source ID includes band information.?

  • It will be difficult to know which grid square the centralized signals
    are coming from unless the source ID includes location information.

  • Some sort of coverage plan, or at least a coverage map may be
    be required to make most effective use of the system.

  • Aggregated data should probably be available in both visual (web
    page map), and in raw data formats so that others can use your server
    output for further automated processing.

  • What is in it for those who will be installing receivers and the thin-
    client access to to Internet?? What would be the motivation for many
    to participate with getting and maintaining their facilities to provide
    data to your system?

  • Who would be the target clients of your system and it's data?? Why
    would they be interested in it?

  • I'm guessing that the central server would be receiving audio (VoIP...?)
    information from simple QRSS receivers, and would need to process
    this audio from many different sources.? That seems like it would
    require a dedicated sound card based ADC processor for each input
    signal.? That is a lot of sound cards for one computer unless some
    method can be designed to multiplex AF signal processing.? Have you
    worked out a method for doing this?

  • The amount of equipment for the central aggregation and processing
    system may become significant.? How would you pay for this, and who
    would install and maintain it?? This brings to mind ideas about using
    "cloud computing" methods to distribute the processing and data
    management, but software for that has not yet been written...are
    you going to do it??? Hmmm...maybe we need to just add a downstream
    data link for existing QRSS reception software so that ARGO and/or
    Spectran could send received signal info to your centralized (or distributed)
    QRSS aggregation system?

  • Maybe the best approach if you are really interested in making it happen
    would be to go ahead on your own and build it, with the assumption that
    "if it gets built, they clients will use it".? I'm not wholly convinced that this
    is a good assumption, but there is one way to really try the concept...build
    the system and see if anybody wants to play in your sandbox.
As mentioned earlier, I too have discussed with others the possibility of doing
more with QRSS, only to run into a wall of indifference, criticism, and resistance
to change.

About a year ago I built a rudimentary QRSS receiver and put it on the Internet
via my own local QRSS viewer and web server:

???? ??? .

To say that nobody was/is interested would be a significant understatement.?

Today the aggregation of QRSS servers known as the QRSS Compendium

??? ???

is dominated by a few long-time participants who apparently have large
antenna installations and excellent receiving systems.? Those with lesser systems
or less time in the group are not even mentioned in the Compendium.? Because
of this apparent good-old-boys-club aspect of QRSS activity, your proposal might
potentially be seen as competing with, and disruptive to, their well established
system.

My suggestion is to go forward with your idea, even if you don't get volunteers
who are begging to help build it and want to become participants in the result.
If you make announcements here as certain parts of your system become
available for general use, some of us will try it.? We might even like it.? :-)

73's

Arv K7HKL
_._


On 06/07/2011 05:21 AM, Clayton G wrote:

?

Hello Knights!
?
I didn't get much response to my email last month, but I'll try another tact before giving up.
?
For a while I've had an idea of developing a server system with remote 'thin' receivers around the world. These receivers would send in their sample data of a narrow QRSS band to the server, which would then generate a worldwide view of the signals being grabbed. Data could also be logged and overlays generated etc etc - it is kind of like the WSPR net but for visual MEPTs. At minimum it would allow for a worldwide instant display of activity with the ability to roll back in time.
?
Anyway I implemented the 'thin' receiver for a design contest, and got among the winners. Subsequently the magazine (Circuit Cellar) has asked if I'd like to turn my project into a published article. As I'd get paid for this, it could be a source of seed funds to make the QRSS network a reality.
?
The real question though is do the Knights think such a network is of value, or do you find the aggregators and ad-hock grabbers sufficient? Personally I found it inadequate when I was running my MEPT, but this is in part due to the solar power and low duty cycle of my MEPT - I had to watch at just the right time to see it.
?
The other benefit of the network is the ability to expand the grabber base. As the receivers will be cheap (I think the component cost can be as little as $50) and not require a PC or anything (only a power source, antenna and internet connection) more operators should be able to install them.
?
What do you think???
?
Clayton
VK1TKA/ZL3TKA
?
----- Original Message -----
From: Clayton G
Sent: Thursday, May 05, 2011 10:52 AM
Subject: QRSS grabber receiver & server project

I recently entered a design project with a QRSS application. I was luck to get amount the winners with my entry. See:


The project was a small (and hence cheap) receiver (a SDR) and DSP processor + ethernet interface. The idea is that with these receivers doted around the world sending their small bandwidth of sample data to a central server we could get a central webpage to a worldwide network of grabber receivers (much like the WSPR network manages the WSPR spots). My project was the receiver end of the project only - the server itself was beyond the scope. The receiver used a cheap GPS module to calibrate its internal?oscillator?and hence obtain frequency accuracy (with the central server doing the necessary calculations and managing this).

The hope was to be able to build the receiver for < $100, with the only need beyond that being the power supply, antenna, and ethernet connection (ie no radio or computer required). I got the basics working, but there is still plenty of scope to improve the receiver (such as reduction of the amount of data transferred - currently it would use about 3.5GB/month), sort out the receiver design PCB etc, and to get the server operating to accept the data and manage the receivers.

Anyway, the details are in the entry documents on the website above. I would love this project to move beyond just this contest entry. Is anyone interested in being part of such a project. The main need at present is someone to take on the server side, and a suitable place to host it; although receiver work is also required. Anyone interested? I'm a bit tied up with other project at present, but can do some more work on the receiver.

Regards
Clayton
VK1TKA/ZL3TKA
Re: QRSS grabber network?

Stephen Farthing
 

Hi Clayton,

I think this is really an interesting thing to try and achieve. I am not on the air much now due to a shack/antenna/life reorganization but when i was it was always an exercise in patience to wait for a grabber to pick my signals up. Hans and i have sold well over 400 beacon kits now and I often wonder how many people built them only to give up when they had no "grabs"....someone once said that QRSS is a bit like fly fishing...it takes a lot of skill and patience but ?once you get a DX grab its all very worth while....

73s Steve


On 7 June 2011 12:21, Clayton G <clayton@...> wrote:
?

Hello Knights!
?
I didn't get much response to my email last month, but I'll try another tact before giving up.
?
For a while I've had an idea of developing a server system with remote 'thin' receivers around the world. These receivers would send in their sample data of a narrow QRSS band to the server, which would then generate a worldwide view of the signals being grabbed. Data could also be logged and overlays generated etc etc - it is kind of like the WSPR net but for visual MEPTs. At minimum it would allow for a worldwide instant display of activity with the ability to roll back in time.
?
Anyway I implemented the 'thin' receiver for a design contest, and got among the winners. Subsequently the magazine (Circuit Cellar) has asked if I'd like to turn my project into a published article. As I'd get paid for this, it could be a source of seed funds to make the QRSS network a reality.
?
The real question though is do the Knights think such a network is of value, or do you find the aggregators and ad-hock grabbers sufficient? Personally I found it inadequate when I was running my MEPT, but this is in part due to the solar power and low duty cycle of my MEPT - I had to watch at just the right time to see it.
?
The other benefit of the network is the ability to expand the grabber base. As the receivers will be cheap (I think the component cost can be as little as $50) and not require a PC or anything (only a power source, antenna and internet connection) more operators should be able to install them.
?
What do you think???
?
Clayton
VK1TKA/ZL3TKA
?
----- Original Message -----
From: Clayton G
Sent: Thursday, May 05, 2011 10:52 AM
Subject: QRSS grabber receiver & server project

I recently entered a design project with a QRSS application. I was luck to get amount the winners with my entry. See:


The project was a small (and hence cheap) receiver (a SDR) and DSP processor + ethernet interface. The idea is that with these receivers doted around the world sending their small bandwidth of sample data to a central server we could get a central webpage to a worldwide network of grabber receivers (much like the WSPR network manages the WSPR spots). My project was the receiver end of the project only - the server itself was beyond the scope. The receiver used a cheap GPS module to calibrate its internal?oscillator?and hence obtain frequency accuracy (with the central server doing the necessary calculations and managing this).

The hope was to be able to build the receiver for < $100, with the only need beyond that being the power supply, antenna, and ethernet connection (ie no radio or computer required). I got the basics working, but there is still plenty of scope to improve the receiver (such as reduction of the amount of data transferred - currently it would use about 3.5GB/month), sort out the receiver design PCB etc, and to get the server operating to accept the data and manage the receivers.

Anyway, the details are in the entry documents on the website above. I would love this project to move beyond just this contest entry. Is anyone interested in being part of such a project. The main need at present is someone to take on the server side, and a suitable place to host it; although receiver work is also required. Anyone interested? I'm a bit tied up with other project at present, but can do some more work on the receiver.

Regards
Clayton
VK1TKA/ZL3TKA






--
It is vain to do with more that which can be done with less.
QRSS grabber network?

"Clayton G"
 

开云体育

Hello Knights!
?
I didn't get much response to my email last month, but I'll try another tact before giving up.
?
For a while I've had an idea of developing a server system with remote 'thin' receivers around the world. These receivers would send in their sample data of a narrow QRSS band to the server, which would then generate a worldwide view of the signals being grabbed. Data could also be logged and overlays generated etc etc - it is kind of like the WSPR net but for visual MEPTs. At minimum it would allow for a worldwide instant display of activity with the ability to roll back in time.
?
Anyway I implemented the 'thin' receiver for a design contest, and got among the winners. Subsequently the magazine (Circuit Cellar) has asked if I'd like to turn my project into a published article. As I'd get paid for this, it could be a source of seed funds to make the QRSS network a reality.
?
The real question though is do the Knights think such a network is of value, or do you find the aggregators and ad-hock grabbers sufficient? Personally I found it inadequate when I was running my MEPT, but this is in part due to the solar power and low duty cycle of my MEPT - I had to watch at just the right time to see it.
?
The other benefit of the network is the ability to expand the grabber base. As the receivers will be cheap (I think the component cost can be as little as $50) and not require a PC or anything (only a power source, antenna and internet connection) more operators should be able to install them.
?
What do you think???
?
Clayton
VK1TKA/ZL3TKA
?

----- Original Message -----
From: Clayton G
Sent: Thursday, May 05, 2011 10:52 AM
Subject: QRSS grabber receiver & server project

I recently entered a design project with a QRSS application. I was luck to get amount the winners with my entry. See:


The project was a small (and hence cheap) receiver (a SDR) and DSP processor + ethernet interface. The idea is that with these receivers doted around the world sending their small bandwidth of sample data to a central server we could get a central webpage to a worldwide network of grabber receivers (much like the WSPR network manages the WSPR spots). My project was the receiver end of the project only - the server itself was beyond the scope. The receiver used a cheap GPS module to calibrate its internal?oscillator?and hence obtain frequency accuracy (with the central server doing the necessary calculations and managing this).

The hope was to be able to build the receiver for < $100, with the only need beyond that being the power supply, antenna, and ethernet connection (ie no radio or computer required). I got the basics working, but there is still plenty of scope to improve the receiver (such as reduction of the amount of data transferred - currently it would use about 3.5GB/month), sort out the receiver design PCB etc, and to get the server operating to accept the data and manage the receivers.

Anyway, the details are in the entry documents on the website above. I would love this project to move beyond just this contest entry. Is anyone interested in being part of such a project. The main need at present is someone to take on the server side, and a suitable place to host it; although receiver work is also required. Anyone interested? I'm a bit tied up with other project at present, but can do some more work on the receiver.

Regards
Clayton
VK1TKA/ZL3TKA
NEW QRSS3 ON AIR !!!

"Fabrizio"
 

Hi everyone! Finally today on air, after
Hans G0GPL kit 30m QRSS , and amended in accordance
Aldo Iw2DZX I thank them both for the opportunity '
fun! My beacon 'set at the
10.140.04 Mhz frequency of about 100 mW of power,
the antenna and now 'a dipole positioned towards E-
W for physical reasons of space, but a vertical
dedicated 'already' under construction! I would appreciate it if
someone were to listen to my signal
Please e-mail to see if any adjustments are
to do or variants, as with autocode
Argo known that the signal and 'a little' distorted, but
I need to look for the cause of your relationships!
Thanking all in advance for your cooperation
I wish you good listening and good DX to all!
IK6ZEW op. Fabrizio D'Alessandro
JN72CK Pescara Italy
email: ik6zew@...
QSL via qsl.cc
Re: QRSS3 on 10.0030 - 10.0040MHz

Daniel Wiering
 

Hi All,

I have stopped transmitting for the time being i need to do some
adjustments to the setup.

Thanks to those who tried

-Dan
Re: QRSS3 on 10.140030 - 10.140040MHz

Daniel Wiering
 

Apologies...It is a typo... I mean 10.140030 - 10.140040MHz

-Dan
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