Rpi on the Network

As mentioned in the previous post, I now have my Raspberry PI (Rpi) connected to the Network, serving Web Pages and providing (my) access via SSH and Remote Desktop.

Only one wire is needed for this configuration, that is the 5 Volt power from a 1 Amp wall wart. Network access is via the USB WiFi Adapter as shown in the photo. This Rpi can be accessed from anywhere in the world as http://Rpi.WA0UWH.com:8040 . Currently it is serving only a single web page, other fun pages (or links) will be added later.

Rpi running a Web Server, SSH, and Remote Desktop
http://Rpi.WA0UWH.com:8040

My plans include connecting the Rpi to an Ensemble Receiver (SDR), which can be done with only the addition of an Antenna and USB Sound Card.

I am considering moving the Rpi and the SDR to a remote location (where I have WiFi access) so that I can Transmit from my Shack, without overloading the SDR. This remote location will be good for remote QRSS Grabber operation.

I am impressed with the Rpi, it is a fun system.


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WinradHD becomes HDSDR

I have been using WinradHD with my Softrock Ensemble RX since my build, today I checked the download web site and found a new update along with a name change.

The new WinradHD name is HDSDR

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Ensemble - Config Info

This is my build adventures and recommendation for using the Softrock Ensemble SDR.

Note: my computer is an MS XP with SP3 - works for me details for other configurations may vary.

This is my best recollection of my build and test process, others can help by providing corrections, Thanks.

Note: not all Review Edits and Corrections have been made.

The following information is NOT anything new, it is just documented here for easy access.

In general, without any of the following software installed, the first time the Softrock Ensemble is plugged into the computer via the USB cable, it will request for a "new driver" and will ask where it should be found. This simple request for a "new driver" is good news - it means the computer has recognized new hardware. Note: only the USB cable is needed, the normal 12 Volt Power Cable, Antenna and Audio cables are not necessary for these initial LO tests.

Unplug the Softrock Ensemble from the Computer, so that is will wake up again for the following steps, after the initial programs are installed.

Links to programs and most of this information can be found in the Softrock Ensemble Build Instruction (down about 4 pages).

The following software is necessary:

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USB Driver = A USB Driver for the onboard ATTiny85 CPU

• Download the above ZIP'd file and de-compress it into a folder, you will need to know the path to the folder for the next step.

• Re-plug in the Softrock Ensemble via the USB, it (as before) will request for "new driver" and where it should look to find it - supply the path to the above saved folder.

• If all goes well, it will install and complete.

• You should be able to un-plug and re-plug in the Softrock Ensemble with out errors or warning, you should hear the Standard MS Windows "ba-blink" or "ba-blonk" sound when plugging in or out.

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CFGSR  = Configure Software Radio - Used to test Manual control of the Si570 Local Oscillator
SRDLL = Software Radio DLL - Used with CFGSR

• Create a folder called CFGSR  some place, I suggest: C:\Program Files\CFGSR

• Save above two downloads into this new folder, they must be in the same folder together.

• I suggest: create a short-cut to the CFGSR.exe file for your Desktop, it will be handy for now and later testing.

• Execute CFGSR.exe, the Si570 "control panel" will appear, which will allow you to set the Si570 Local Oscillator frequency, test as requested in the build instructions, Or, tune to a known radio frequency that you can monitor - you should hear the LO quite your receiver.

• Follow the remaining build instructions -    . . .  You know, all of those dang filter toroids! - for the love of Ham Radio.

• Note: after the initial testing of the Si570 Local Oscillator, these two programs will not normally be used. But they are good to keep around for trouble shooting.

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WinradHD = A User Interface Program for Normal SDR Operation.
ExtIO_Si570.dll   = A Si570 IO DLL for programmatic control

• Download and install "WinradHD"

• Download and move the "ExtIO_Si570.dll" file into the "WinradHD" folder, normally found at C:\Program Files\Winradhd\

• Note: a copy of this "ExtIO_Si570.dll" file may be needed in each of folders of any other SDR User Interface Programs that you may want to try.

• Create a Short-cut link for the Desktop to the WinradHD.exe  program.

• I suggest, right click on the link, edit properties add "-wv -as" to the execution line. The "-wv" allows WinradHD to be displayed in a normal (movable) Desktop window, and the "-as"  does an auto-start, see WinRadHD Home Page.

• Note: you may need to select a "sound card" and the "Si570" IO from the WinradHD configuration controls.

Update: as of Dec 23, 2010 WinradHD changed name to HDSDR see: http://www.hdsdr.de/

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Now, it is time for having some fun with SDR SWL.

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More, Fun With SDR

If you have followed my build of the Softrock Ensemble SDR Kit, you may want to re-review my previous posts - a lot of "updates" have been included as I have learn much more.

Thanks to ALL of the many e-mails, links, tips and tricks.

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Fun With SDR

OK, so I am still new to Software Defined Radio (SDR) and the Softrock Ensemble Kit - I am still learning things that maybe I should have known? But, the following are things that I have found interesting:

• On my PC I can run multiple copies of the I/Q Decoders and listen to multiple QSOs at the same time. I have room for three Decoders on the screen at the same time. I use; one to follow a conversation or net,  a second for waiting for a fading QSO to return, and the third to explore pop-up signals that I may want to listen to later. The only requirement is that the stations must be within 40kHz of each other, with a more expensive sound card that can be increased. Note: the multiple decoders can be all the same program, ran multiple times, or yet another program for other purposes. 

• We all have had to listened to that annoying station just up the band from our intended QSO, and other than filters we could do nothing about it. With SDR you have very sharp built-in filters, and you can listen to multiple "selected" conversation at the same time - a new multi-tasking mode. Each Decoder can be set to mute (stop mode) if desired. I know, it sounds complex, but it is much more useful than you might think.

• I checked the stability of the SDR, it is good enough for a QRSS Grabber. The ARGO Grabber program is just another I/Q decoder. The Ensemble is cheep enough that it could be dedicated to the task. I think it could also be used for Receive Only WSPR - more investigation needed.

More SDR to learn!

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Ensemble - A Recruitment Tool

I am impressed with "Softrock RX Ensemble Kit" !  -  It is a great tool for Amateur Radio Recruitment

I know this sounds like an advertisement (I get nothing, I am only a user), but I am EXCITED by what this could mean for kids!

If you have a friend, or a young adult, that likes computers and wants to get involved with Radio, and Shortwave Listening (SWL), the Ensemble Kit is a great start.

Computer controlled SWL from 1 to 30mHz (optimized for the Ham Bands)

All that is needed is:

• The Ensemble Kit - $58
• A Computer - ( it should have a reasonably good sound card)
• A 9 or 12 Volt Battery
• And an Antenna

I think most people will already have the computer.

Many, many years ago, my first good SWL Radio cost me about $600 (if I remember correctly), today, the above Kit provides much more flexibility and potentially holds more interest.

The only two down-sides are:

• It is a "Kit", with some very small parts that requires some special soldering skills.
• The Kits are only available when listed on Tony Parks web site,  his production runs are sold out fast, check the link often.

But what great fun it is -  to see a "lump of circuit board" on your desk, with only 4 connecting wires, while listening to QSOs around the world - That is the "magic" that starts a new recruit into a life long love of Ham Radio!

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Softrock RX Ensemble Kit - Complete

I finished building the "Softrock RX Ensemble Kit" - it works!

I have been listening around the bands, mostly 20m, 40m and WWV.

There are some things that I have learned about SDR systems - I think all of this is correct, but I will correct it as I learn more:

• A few SDR programs control the Receivers Local Oscillator and Decode the I/Q signals for display and for listening.
• Many of the SRD programs are only Decoders of the received I/Q signals, and require a second program to set the Si570 LO - That was really NEWs to me.
• I am going to be experimenting with other software for use with this radio.
• Listening to a segment of the band while watching the water fall display is enjoyable and makes for quick frequency changes.
• UPDATE: Some I/Q Decoders can control the Si570 LO, it is just not obvious.  I discovered that Rocky can control the LO, but it does it via a menu pick table - a little hard to use but it works.
• I need to investigate each Decoder for LO control.

The configuration that seems to work best (so far) is "WinradHD" for the I/Q Decoder and "CFGSR" for controlling the Local Oscillator (Si570). It is necessary to set the frequency with CFGSR and then type the same frequency into WinRadHD, so that the displayed frequency scale is correct. I hope I am missing something here, and I hope this works better as I learn more.

WinradHD - Tuned to WWV

CFGSR - Si570 Control

Normally you set the LO to a frequency within 20KkHz of your desired listening frequency. I have been using about 6KHz difference for a start.

UPDATE - Correction: Thanks to Chris's email and the Internet, my previous understanding was WRONG. WinRadHD can control the LO directly as indicated below,  - Thanks to the very helpful folks on the Internet.

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Hi Eldon,

Regarding your Ensemble II build and your use of WinradHD which I read on your blog. WinradHD can controll the softrock directly without using CFGSR, please ignore if you already know the following: Download this DLL file (http://home.ict.nl/~fredkrom/pe0fko/ExtIO_Si570/ExtIO_Si570.dll) and place it in the WinradHD program folder (typically C:\program files\WinradHD\). Then start WinradHD and click on the options menu, under 'select input' you should now have an option for the SoftRock, click this and WinradHD will now control the LO as you navigate WinradHD around the bands.

Kind regards, 

Chris.

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UPDATE: The "Rocky" Decoder was my next introduction to SDR Decoders.

Rocky SDR

I have looked at "PowerSDR-IQ", but have not got it to work correctly. UPDATE: Patrick York - KF4LMZ, sent me the following link - I need to review it as it describes the how to use PowerSDR-IQ with the Ensemble. http://www.wb5rvz.com/sdr/ensemble/psdriq.htm

I am currently powering the Ensemble with a 9 Volt Battery and therefore it has little or no induced line noise (and/or ground loops). If you read this blog much, what else would you expected from me, I always use 9 Volt Batteries for my projects.

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UPDATE
I recently found "M0KGK SDR Decoder" which looks very good and easy to use.

M0KGK SDR

It is interesting that it is possible to run multiple Decoders, at the sometime on the PC - each can be turned OFF and ON to access the audio channel for operational comparison.

UPDATE
I also found the SDRADIO Decoder - which also looks very good, setting frequency and the audio band pass filter is "mouse click" obvious - I like it!

SDRADIO

Note: This Decoder does not have as much of a problem displaying and decoding the centre LO frequency as the others appear, it must use some new math.

Now, maybe too many to try to use!?

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UPDATE

See more follow up configuration information.

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Note: I obtained the above images from the Internet, I hope the original owner will not mind, for each I have provided a link to their home page, via image click.

-- Home Page: https://WA0UWH.blogspot.com

The Ensemble Build Continues

My "Softrock RX Ensemble Kit" Build Progress (see previous post):

• DC Power and 5 Volt Reg components Installed
• USB circuit and Si570 components Installed
• Initial Voltage Tests - 5 Volt and 3.3 Volt - OK
• XP USB Driver Installed - OK
• Downloaded and Installed "CFGSR" and "SRDLL" - OK
• Initial Test Local Oscillator Si570 Tests - OK
• I can hear the Si570 when it is set to an aviation frequency on my Aviation Radio. - OK
• The 160m Band Pass Filter is installed and continuity tested - OK

UPDATE

• The other three filters are wound, installed and continuity tested - OK

IT WORKS !

• I have listened to 40 metres and WWV
• Now for some calibration and performance testing

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Ensemble Kit Build Re-Started

As part of a group project, a lot of the members of the Puget Sound QRP Group (pQRP) are building the "Softrock RX Ensemble Kit" for our group exploration of Software Defined Radios (SDR).

As reported in a previous post, I had a false start of my build while at Salmoncon. My goal was to get it started, finished and tested before leaving the event, but that did not happen. With more time now, I plan to continue the project.

Wednesday night, while at our last pQRP P&C (Pie and Coffee) Meeting, Alen asked a few questions about my build process and progress, he asked;

Could Reflow Techniques be used to build the Kit?

• That Depends, If you want to follow the build instruction the answer is probable - NO. 
• The instuctions include intermediate voltage and current tests before successive parts are installed. Also parts are installed on both sides of the PCB with through hole and SMT parts added for each test. 

What size of Soldering Iron should be used?

• My glib answer was; If you can see the tip, use the next size smaller! 
• But it depends, on the technique used for soldering. To use flood solder with solder wick clean up larger tip (maybe 1/16 inch) could be used. Flood Solder is where you drag a puddle of solder and lots of flux across a group of pins, then remove excess with solder wick. 
• I use single pin soldering with very little solder wick clean up. I use a small 1/64 inch tip for most of my SMT work. 

As per the instruction, I have the 12 Volt Power Supply, USB, Local Oscillator (Si570) and Control Circuits installed. The next steps include; down loading Firmware to the PIC, loading Software onto the PC and doing some initial tests for proper oscillator operations. I just need some time to do the tasks.

At the P&C meeting, Charlie - took the following incredible photo of my partially completed board. Note, this photo was taken with a hand held camera while setting at the table, with the board propped up on a coffee mug, a setting sun beam provided the light.

Si570 Local Oscillator and USB Circuit

Charlie with his Cannon S90 camera takes great photos in very adverse conditions.

If I had known that a photo was going to be taken, I would have cleaned the board with alcohol, to at least remove rosin splatters. I am looking forward to a completed board photo.

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