Author: pe2mc

Posted on: 28th March 2013


Category: News, Station ,Amature

Raspberry Pi as Remote Server for RTL2832u SDR

As the raspberry pi can be used by serval projects. I allready have a Pi running with a Dstar Hotspot. Now i find it fun to test a RTL2832 dongle connected with my second Raspberry pi. To see how this works. With the small antenna the recieving is kinda low. But it works.

Demonstration Video i make for Youtube

Video not available

Why would you want to do this?

There are several reasons you might want to do this. Here are a few:

1. One of the biggest reasons would be to cut down on the amount of antenna cable you have to use. The less cable you use the less signal loss you will have. The Raspberry Pi and rtl_tcp combination will let you mount the RTL2832U closer to your antenna connection point. Let’s say for example that your antenna is mounted in the attic, but your monitoring station is downstairs. Rather than run 150 feet of cable to the monitoring station, mount the RTL2832U and the Raspberry Pi close to the antenna and use WiFi to send the SDR data downstairs.

2. Set up the Raspberry Pi / RTL2832U SDR server in one location and use your laptop running SDR Sharp to monitor your RTL-2832U SDR radio anywhere in the house.

3. Make the Raspberry Pi / RTL2832U server accessible from outside of your home network and listen to your SDR radio while you travel.

4. Set up a remote monitoring location in another part of the country.

5. Mount the whole thing in a weatherproof enclosure powered by solar cells and put it at the top of your antenna tower.

6. Tie it all to a helium balloon and have a 500ft antenna.

I am sure you could think of other uses for such a small portable SDR server.

Geting it Going

1. Install the latest Debian release on your Pi and update it.
2. Before you install the RTL drivers, you will have to install the following dependencies if they are not already installed by typing the following commands in terminal window at the prompt.

sudo apt-get install git
sudo apt-get install cmake
sudo apt-get install
sudo apt-get install build-essential

3. Now we are ready to install the RTL drivers using the following commands:

git clone git://
cd rtl-sdr/
mkdir build
cd build
cmake ../
sudo make install
sudo ldconfig

4. Before this will work you will need to locate your RTL directory using the file manger where the drivers where downloaded and copy the rules file into the etc/udev/rules.d directory.
5. Plug in the RTL-2832U stick and issue the rtl_test -t command to make sure the Raspberry Pi sees your stick.
6. Be sure that port 1234 is open on your router
7. To start the rtl server type rtl_tcp -a plus the ip address of your Pi. For example rtl_tcp -a
8. On your PC download the latest Dev version and configure it according to these instructions. Go to the interface section and and select RTL TCP and enter the IP address of your Raspberry Pi. Start SDR Sharp processing and it should be getting the data form the Pi and the RTL2832U.
9. You can now remove unnecessary peripherals like keyboard, monitor, and mouse.

Potential Problems

I have noticed that the server will stop working under the following circumstances, there may be more but these have been fairly consistent.
1.If you exit SDR Sharp without stopping it’s processing of the remote data from the server.
2.If the bandwidth gets to narrow to handle the data properly. This can be more of a problem with WiFi as the distance gets further between the Raspberry Pi and the router. A work around is to lower the sample rate on SDR Sharp.
3.Tuning to an unsupported frequency area of your RTL-2832U stick.

For these reasons, if you are going to run the SDR server headless or locate the Raspberry Pi in an area where it cannot be accessed easily, you will need to get SSH going on the Pi and install Putty on your PC. By default SSH is usually already active on the Pi. Just install Putty on your PC and open a session using the IP address of your Pi. The default user name is usually Pi and the password is Raspberry. This will allow you to access the Raspberry Pi remotely to start the SDR server.

I used the information from the internet.

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Author: pe2mc

Posted on: 28th February 2013

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Category: News, Station ,Amature

Internet becomes more and more effective in streaming audio and media. As the internet connection getting to a higher level it possible to do more in less time.
Also the Hamradio brand is more and more into the combination of analog radio and communication true the internet.

Examples are the D-star network and Echolink. Those two options are more then welcome for the interlink with repeaters.
It’s not that the Internet will take over the complete communication. But it helping out with a lot of new tools.

As from the end of January Streamingmedia started a complete new website. This is related to the Hamradio community.
On that website is the interlink with analog audio streaming to the internet. So a local Repeater is getting closer and closer.

The website provides streaming on a any platform and tablad you are going to use.

Just take a look and get enjoyed with the streams.

Marco PE2MC

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Author: pe2mc

Posted on: 22nd February 2013


Category: Station ,Amature

ID515_480x640Icom brand started to deliver the latest Handheld ID-51.
There are many people who like to test the new toy. A few results are on the internet.

I did get my first results from the ID-51 by PA3HGT. He is an owner of the very first ID-51 Handheld.
He comment: Perfect Handheld radio and very lightweight.
There is a big discussion about the Audio of the Handheld ID-51.

There are a lot complaining about the sound of the microphone.
Of course there are many ways to solve this problem.

For instance get a external Microphone. HM133 does fit perfect.
Or just Mod the Case of the ID-51. Be careful with the way and how to.

There are a few thing you need to consider before starting with this Mod.

– Remove the micro sd card !! otherwise it will break.
– Be careful when opening the case. You easy will damage it.

On the first picture you see the ID-51 open with the O ring you need to remove. On that ring there is also some sort of foam. That also has to be removed.
The second foam in the case will stay just the way it is. That is what you see in picture 3. Finally your done to close the ID-51. Have fun with the new Audio sound of the ID-51.

ID511_640x480 ID512_640x480 ID513_640x480

Remember the second batch of the ID-51 does not have this problem. That is the sound and information i did hear from people.

Just my 2 cents to inform you 🙂  ( tnx to Hans PA3HGT for sharing his Photo’s)

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Author: pe2mc

Posted on: 7th January 2013

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Category: News, Station ,Amature

As i search the internet there are some items about the mod for the HM133 to upgrade the low tone in the audio.

There are many ways to do this mod.  The first one i posted on the web is very tricky. If you heat it up to much your HM133 will fail.

Resent i discovered a new way to provide the mod on the HM133. This one is very easy to do.

Just take a 10uF tantaal and set this on mic and position 6 of the RJ45 pinout. Just check the diagram.

4513_HM_133_wire-3  IMG_1382 IMG_1384 IMG_1383

See the difference between Mod 1 and Mod 2.  Mod 2 is very good to setup. Mod 1 is tricky enough.

Author: pe2mc

Posted on: 17th December 2012

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Category: funny, News


As from WP3.5 there is a minor issue on Theme my login.
Is so easy to change the code on your blog page of page.
But what can you do when its activated and you can’t login.

– Try wp-login.php instead. It has to work if you not set the htaccess
– Else login with a FTP client and go to your plugin folder. Change the folder “theme-my-login” into “theme-my-login.” (ad a dash on the end.)
– Now you can login like normal with wp-admin.

Got to the page you ad with the shortcode [theme-my-login-page] and change this into [theme-my login]

Your almost set to go. Change back the plugin folder “theme-my-login.” into “theme-my-login” ( remove the dash)

Theme my login will work after reactivating the plugin.

** note i removed the – in the theme-my login otherwise the plugin is starting to work  on the post page **

Have fun

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Author: pe2mc

Posted on: 8th December 2012

1 Comment

Category: News, Station ,Amature

Modification on the HM-133 microphone.

As i discovered some minor Audio probelems on the output on the IC-2820.  It’s kind of high and does not have any low or mid in the audio transmission.
I searched on the internet and found some options.  I decided  to take the option what can be done easy.  Putting a 1,5uF condenser on the C30.  Also making an better way for the audio  to the microphone.
You will see pictures before and after the modification.

Normal front side                           Modification with the Condenser 1,5uF

Mike input before the mod                                      Mic after the mod



The two shematic diagrams where to put the condenser

After all is set just edited the menu of your IC-2820


Hope you will find this modification helpfull on your tranciever.

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