Author: pe2mc


Posted on: 27th September 2013

No Comments

Category: News, Station ,Amature

About DMR
Although analog technology offers some great benefits such as low total cost of ownership, customizable coverage, features and simple / reliable implementation, it has reached its peak. Some limitations include are battery life, voice quality (near the edge,) low productivity in communication and integrated data applications. In addition, analog radio users are facing spectrum shortages resulting in overcrowding and interference.
Over the years, LMR systems have used wideband 25 kHz channel spacing. The current spectrum efficiency cannot meet the new mandate. In December 2004, the Federal Communications Commission mandated that all private LMR users operating below 512 MHz move to 12.5 kHz narrowband voice channels and high efficient data channel operations by January 1, 2013. If you are operating a wideband (25 kHz) system in the VHF or UHF land mobile band, you may continue to do so until the deadline January 1, 2013. All radio users should start to plan and prepare for the narrowband migration now. Furthermore, on January 1, 2011, licensees will be permitted to apply for new systems or to expand their existing systems only if they will be utilizing 12.5 kHz bandwidth (or less) equipment or equipment that satisfies the new 6.25 Khz standard. Users will need to take this deadline into consideration if you are planning to implement a new system or to make modifications to your existing system.
DMR Standard
Digital Mobile Radio (DMR) is a digital radio standard specified for professional mobile radio (PMR) users developed by the European Telecommunications Standards Institute (ESTI), and first ratified in 2005. The DMR protocol covers unlicensed (Tier I), licensed conventional (Tier II) and licensed trunked (Tier III) modes of operation, although commercial applications today are focused on the Tier II and III licensed categories.
The standard is designed to operate within the existing 12.5 kHz channel spacing used in licensed land mobile frequency bands globally and to meet future regulatory requirements for 6.25 kHz channel spacing. The primary goal is to manufacture affordable digital systems that are easy to operate. DMR provides voice, data, and other auxiliary services. Today, products designed to DMR specifications are sold in all regions of the world.
DMR technology helps alleviate analog issues by providing increased capacity and spectral efficiency resulting in clear, unbroken, reliable communications. End user benefits include improved productivity, low cost savings and increased customer satisfaction.

About The DMR Association
The DMR Association was first set up in 2005 as the DMR-MOU Association by a group of leading public mobile radio manufacturers to support ETSI during the DMR standardization process. The DMR Association is open to any organization or individual interested in using or building DMR products or in supporting the DMR standard in other ways. The Association maintains links with regulators, trade bodies and standards organizations around the world.
The companies below are members of the DMR Association. But, only Hytera and Motorola own the DMR terminal products so far.

Distinguished Aspects of DMR Standard
Although DMR, TETRA, P25, and MPT-1327 are all based on open standards, they are also based on different protocols and targeted at different markets (e.g., TETRA and P25 are largely used by public safety organizations) and are not technically compatible. Another standard created by ETSI, dPMR, is considered a competitor to DMR in the business market, but as of today, products built to the standard are targeted at the low power, unlicensed part of the specification, best suited for personal use, recreation, small retail and other settings that do not require wide area coverage or advanced features.
The coverage area of a TETRA base station is approximately between half and one third compared to that of an analog or DMR radio system, therefore TETRA needs a lot of more sites. A medium size TETRA system may costs 3 to 5 times more than a DMR one. The features of these systems are near the same (digital encryption, positioning, messaging) than the DMR, however developing rapidly for the commercial applications.
TETRA is a trunking system targeted to point-to-point communication in a multi cell and high traffic environments. Like a telephone network, hundreds of users in a little area require a lot of radio cells to deliver the communications. DMR is a dedicated channel or trunking system targeted to provide robust coverage rather than capacity.
The Market Tiers of DMR
The PMR market can be divided into three tiers: commercial, public safety and mission critical. Different products and standards address different tiers. DMR crosses all three tiers such as Public safety, Private security, Government, Education Campuses, Hospitality, Manufacturing and construction, Utilities, Transport, and Oil/Gas.

The Advantages of DMR Technology
Superior audio performance
DMR Digital technology provides better noise rejection and preserves voice quality over a greater range than analog, especially at the farthest edges of the transmission range based on the combined efforts of narrowband codec and digital error-correction technology. The digital processing is able to screen out noise and re-construct signals from degraded transmissions. Users can hear everything being said much more clearly, thus increasing the effective range of the radio and keeping users responsive to dynamic situations in the field.

Doubling capacity in your existing 12.5 kHz licensed channels
One of the main benefits of DMR is that it enables a single 12.5 kHz channel to support two simultaneous and independent calls.

How this is achieved?
Under the DMR standard, Time Division Multiple Access (TDMA) retains the 12.5 kHz channel spacing and divides it into two alternating time slots. Each time slot acts as a separate communication channel with an equivalent bandwidth of 6.25 kHz, but the channel as a whole, maintains the same profile as an analog 12.5 kHz signal.
This means that DMR will fit into your existing licensed PMR bands so there is no need for re-banding or re-licensing simultaneously doubling the capacity of your 12.5 kHz channel.

While the voice channel is utilizing the first time slot, the second time slot, in a TDMA system, is used for transmitting application data such as text messaging or location data in parallel with call activity. This is useful in dispatch systems that provide both verbal and visual dispatch instructions. In an increasingly data rich world, this enhanced data capability will become important. The future roadmap for two slot TDMA applications will include the ability to temporarily combine both slots to effectively double the data rate, or to use both slots together to enable full-duplex private calls. FDMA solutions can not deliver these capabilities on a single channel.

Efficient usage of DMR infrastructure equipment

The main advantage of the DMR TDMA approach is that you get two channels with one repeater, one antenna, and a simple duplexer. Compared to FDMA solutions, two slot TDMA allows you to achieve 6.25 kHz equivalent efficiency while minimizing investments in repeaters and combining equipment. The required equipment of the two approaches for a simple system is shown below.

FDMA requires a dedicated repeater for each channel, plus expensive combining equipment to enable multiple frequencies to share a single base station antenna. It can be very expensive to make combining equipment work with 6.25 kHz signals. The end result is a typical loss in signal quality and range when configured as such.
Two slot TDMA achieves stable two channel equivalency using single channel equipment. No extra repeaters or combining equipment are required (and there is lower drain on air conditioning and less back up power supplies needed). End result, lower cost and simpler site planning for DMR users.
Longer battery life and greater power efficiency
One of the biggest challenges with mobile devices has always been battery life. In the past, there have been limited options for increasing the talk time on a single battery charge.
Since each call uses only one of the two time slots, it requires only half of the transmitter’s capacity. For example, in a typical duty cycle of 5 percent transmit, 5 percent receive, and 90 percent idle, the transmit time accounts for a high proportion of the drain on the radio’s battery. By cutting the effective transmit time in half, two slot TDMA can enable up to 40 percent improvement in talk time in comparison with analog radios. With overall battery consumption per call dramatically reduced, longer usage time in the field between recharges is achieved. Modern digital devices also include sleep and power management technologies that increase battery life even further.
These power efficient features give DMR users a leaner and greener radio network as well as the benefit of long battery life on the radios themselves.
Ease of use in data applications
The end-to-end digital nature of DMR enables applications such as text messaging, GPS, and telemetry to be easily added into radio devices and systems.
As the DMR standard, it also supports the transmission of IP data over the air, which enables the easy development of standard applications. In a world which increasingly relies on data as well as voice communication this ability to add a wide range of data applications to your system results in the greatest possible return on your investment.
Compatible with current FM analog system and support to migrate to DMR system
DMR can operate in either analog or digital mode. DMR allows migration to take place one radio at a time, one channel at a time or the entire system at a time
Security standard
Since DMR is a fully public open standard backed by a wide variety of vendors, buyers can be assured of continuity of supply. Today DMR is the most widely adopted digital two-way radio system, is active in over 100 countries, and is the market leading digital PMR technology.

Conclusion
DMR is the best established digital technology in the market today and is the clear choice for organizations looking to deploy new digital two-way radio systems, or to upgrade their existing analog radio to digital.

 

http://www.ham-dmr.nl/

http://dmrshop.nl/

http://www.d-star.nu/

http://www.dmr-marc.net/GSM-ID.html

 

 

 

Tags: , , , , , , , , , , , , , , , , , , , , , , , ,

Author: pe2mc


Posted on: 11th September 2013

No Comments

Category: News

ham radio web

HAM RADIO HEROES
AND SOME NOT SO HEROIC

by Nunzio Addabbo, W4VYD

“It has always been my belief that ham radio is first and foremost a people hobby. We are people using technology to make contact with other people, whether they’re in the next town, the next state, or the other side of the world. Ham Radio Heroes looks at some of those people and how amateur radio has helped lead them to some extraordinary achievements. Their stories are retold here with Nunz’s personal touch added. You’ll find yourself not wanting to put down the book until the story you’re reading is finished…and then you’ll want to read the next story.”

— Rich Moseson, W2VU

Editor, CQ magazine

“The 58 year wait was worth it. These are stories that will inspire hams who practice and love the world’s best hobby. The author is no stranger to excitement himself. His life story is amazing. For the non-hams these stories may move you to find out more about Amateur Radio and perhaps join our ranks.”

— Joe Thompson, W3SRU

Director, Radio Society of Tucson

“Many people think of Amateur Radio as merely a hobby, but this book tells the compelling story of hams as genuine heroes in service to humanity.”

— Steve Ford, WB8IMY

QST Editor

“Addabbo’s book makes it clear that inside every ham lives a hero—waiting for the right moment to emerge.”

— Chuck Penson, WA7ZZE

Archivist, Titan Missile Museum

“A great part of the lure of Amateur Radio is the lore. And, Nunzio Addabbo, W4VYD has done a fine job of reporting.”

— Armond Noble, W6WR

Publisher, WorldRadio

“Mr. Addabbo is not only a gifted writer but also a Ham Hero. He saved my father’s life and his expertise in radio communications was invaluable in resolving the JFK assassination conspiracy. This is a page-turner with many unforgettable Ham Radio stories!”

— George Berlotti, Attorney

international Law

“Absolutely fascinating book about Amateur Radio Heroes. A terrific read.”

— Tom Fagan, K7DF

ARRL Section Manager- Arizona

“If by chance you are seeking an author with inspiration and aptitude, HAM RADIO HEROES is a must to read.”

— James Santelli, KA2YEY

Retired International Construction Manager

“Nunz is a ham’s Ham! He still builds his own antennas and other equipment and was one of the first in Tucson to adopt the new digital D-Star technology. He is one of the most active members of the Radio Society of Tucson (RST) and rarely misses a meeting or event. I have always found Nunz to be extremely knowledgeable, thoughtful and one who pays great attention to detail. I absolutely recommend this book. It was well thought out, researched and comes from a man who personifies Ham Radio and is a credit to the hobby. Once you pick up this book, I guarantee you will not let it out of your sight.”

— Randy Malick, KF0X

President, Radio Society of Tucson

ARRL Public Information Officer

Secretary, ARCA

 

Ham radio: A fading hobby … until emergencies hit

February 3, 2010|By Anika Myers Palm, Orlando Sentinel

At the National Weather Service, meteorologists are surrounded by some of the most up-to-date technology, which they use to track weather systems and dangerous storms.

But when the computers go down, forecasters may have to depend on hundreds of Central Florida hobbyists who use a method widely perceived to be decidedly less technologically advanced: amateur radio.

 

( This tells ya Hamradio is a Hobby and not a Crime )   Beautiful words!

 

See >  http://3mpub.com/addabbo/ham_radio_heroes.html  for more information

Tags: , , , , , , , , , , , , , , , , , , , , , ,

Author: pe2mc


Posted on: 10th September 2013

No Comments

Category: Uncategorized

LED lamps are becoming cheaper by the day – and noisier. A recent study by PF0EMC and others shows the spectrum from 3 MHz to 30 MHz.

The first image shows the spectrum with the LED lamp switched off, the second one with the LED lamp switched on. You can click on the images for a better (sharper) view.
Background Noise 1

3 MHz to 30 MHz, LED lamp switched off
Background Noise 2

3 MHz to 30 MHz, LED lamp switched on

So it’s getting worse and worse. Now we not only have to deal with PLC technology, but also with something basic like lighting. While I can temporarily kill a PLC device (it’s against Dutch law to discuss how, don’t ask, you won’t get an answer), I can’t switch off someone’s LED lights.

background-noise-1background-noise-2

info: http://hamgear.wordpress.com/ ( PD0AC )

Tags: , , ,

Author: pe2mc


Posted on: 27th August 2013

No Comments

Category: News, Station ,Amature

mask175Description

Search the exhaustive QRZ.COM call sign database from your mobile device.  Instant access to more than 1.2 million amateur radio call signs from around the world.   Completely free with no subscription required.  Optimized to take advantage of the different screen sizes of the iPhone 4, iPhone 5 and iPad.
Features:
* Complete license holder information * Interactive map with beam heading and distance  (on supported devices) * Displays profile photo (if uploaded to QRZ.COM) * Display biography (if updated on QRZ.COM) * Send email to the displayed contact * Call sign lookup history * Access to QRZ.COM website from within the application * No advertisements

…More

What’s New in Version 1.1

Added the ability to view biographical information Tapping on the history page retrieves the selected call sign Added an option to clear the history list Fixed mapping error when the grid square is

screen568x568 screen2568x568

 

LINK >>>>>>>>>>>>  https://itunes.apple.com/us/app/callsign-search/id680180116?mt=8

 

Tags: , , , , , ,

Author: pe2mc


Posted on: 26th August 2013

No Comments

Category: News, Station ,Amature

pj2On 26 and 27 October is the CQWW SSB contest. An international team of  radio amateurs, including the Dutch ham Marco (PE2MC) and Ton (PA1CC) will participate from PJ2T. A real good location to hit the pile ups and getting a nice score.

Because one operator step down from the group there is one place available on the team.

If you like to join the pile ups and enjoying the weather check in with us.!!!

Contact N0VD for more details and information.

 

calendar_towers_from_road

Dates: 26 – 27 October 2013

Contest Director: N0VD

Pre-Contest Logistics Coordinator: N0VD / W0CG

On-Site Logistics Coordinator: N0VD

Team : G3NKC, G4XUM, K8LEE, LW9EOC, N0VD, N4RV, PA1CC, PE2MC, YV1DIG

Callsign: PJ2T

Category: Multi-Multi

Logging Software: TBD

License: License to be obtained by W0CG in September 2013.

Draft Operating Schedule: Not yet prepared.

Meal Plan: Not yet prepared.

Rules: Click here for the 2013 rules. 

 

Link  http://www.pj2t.org/ccc/default.htm

 

Marco PE2MC

Tags: , , , , , , , , , , , , , ,

Author: pe2mc


Posted on: 26th August 2013

No Comments

Category: Station ,Amature

Yesterday in they afternoon Kelly N0VD organize a local ham meeting with the locals. People who where there where: Steve KT0DX, Rob N0RU,  Jay W5JQ, Kelly  N0VD , PE2MC ( myself),  Shel KF0UR,  Greg W0CG

Jay W5JQ is a real CW operator. And does not even own a Microphone 🙂 . I told Jay that i already worked 302 dxcc without even knowing any cw letter. Just F4 and F5 :). Decoding my own call  599 , 73 , tu i can hear. Just because of the sound. They had to laugh about that. On they other hand  Greg W0CG told me that he worked Ton PA1CC over 1000 times in CW.  I told Greg that i know Ton in person. Ton will also be a operator on PJ2T in the CQWWSSB contest this October. You can see that Hamradio is even smaller then you think it is.

Also we discus the new up comming DX peditions. And what people got to do to set this up.

We all know each other. But never had met in person.

 

603359_10200365961264855_395505313_n

Shel  KF0UR showed me his new toy. He inventend a new extended display for his K3. Als the information is shown in a website.  http://qrpworks.weebly.com/index.html

It can log 1200 qso fully automatic.

3442858_orig

 

Expanded Display

80-char. display plus scroll-back
3220619_orig
8533551_orig

KX3 Rig Control

With Macros and Keyboard
8366566_orig
1026999_orig

KX3 Logging Screen

At a glance
5486423_orig
RWD-1

The RWD-1 is a remote LCD display kit designed for the Elecraft W1 and W2 RF power/SWR meters. The RWD-1 provides fast acting bar graphs to assist in adjusting antenna tuners and amplifiers.  It provides more resolution than the LEDs on the W1 and W2 by offering large, easy-to-view digital readouts of power and SWR.  The RWD-1, when paired with the Elecraft W1, will provide a battery powered, high resolution, digital power and SWR meter suitable for field operations.

  • Compatible with Elecraft W1 and W2 meters (auto sensing)
  • SWR and power displayed in digital and graphical formats
  • SWR alarm with adjustable threshold
  • Average or Peak power display
  • 100 mw resolution below 10 watts
  • Two formats: Large digits with Forward Power and SWR with fast bar graphs
  • Smaller digits with Forward and Reverse Power and SWR, all with fast bar graphs
  • Battery powered or 11-15 volt DC external power
  • Assemble in 30-45 minutes, all ‘through-hole’ parts
  • Options include a beautiful Lexan cabinet by W8FGU and a 3’ cable to connect to Elecraft’s W1 or W2

Details about Ham Central Terminal

LCD Display The HCT displays text that has been decoded by your KX3 and K3 in CW, RTTY, and PSK modes on a 80 character LCD display. An additional 400 characters can be viewed by scrolling up and down in the display, while new characters are still being stored.  The LCD is sunlight readable and has an adjustable backlight for night ops.  It will  run outdoors for over 20 hours on an internal 9 volt battery.
Keyboard The HCT uses a standard PC keyboard to enable you to send text in CW, RTTY, and PSK modes as well as to control the HCT.   The keyboard can be used to create, edit, and store up to ten 80 character messages that are accessed via the Function keys on the keyboard for immediate transmission. These messages can be stacked to make even longer messages.   The keyboard can be used to create, edit and store up to ten 80 character rig macros for controlling the KX3 and K3.  For example, a rig macro can instantly change band, frequency, mode, filters, power, etc. without touching any controls on the rig.
(Keyboard not included, must have PS-2 connector).
Logging functions The HCT has a logging function with a real time clock to time/date stamp up to 1200 QSOs.   The frequency and mode are automatically added by polling the rig.  A call sign feature allows you to enter a call sign that not only goes into the log, but will insert itself into a message anywhere you place a “!”, similar to popular contest logging programs.   Text can be entered to add QSO details. The log data is exported to a PC in the standard ADIF format using an HCT Utility application.  The HCT can be used as a stand-alone portable logging device, with or without a KX3 or K3.
Instant QSY An instant QSY command on the keyboard allows the direct entry of any frequency and mode.
Paddle-only operation (no keyboard) The HCT can be used without a keyboard to send CW, RTTY, and PSK text by using a CW paddle.  The decoded text will still display on the HCT’s LCD when a paddle is used, with scrolling enabled using the Mode 1 button.  Pre-stored messages can be selected and sent using the Mode 2 button when using a paddle, perfect for CQing and contesting.
On Screen Help   The HCT has an on screen Help display that shows every available command in a scrollable list, so you can leave the manual at home.

Thanks guys for the very nice local Ham meeting. Really looking for the next one.

Marco W0/PE2MC

 

Tags: , , , , , , , , , , , , , , , , , , , , , ,

Author: pe2mc


Posted on: 26th August 2013

No Comments

Category: Station ,Amature

For those who like to chase DX 🙂

From the 27th of Juli till 10 August i will be on holiday in Colorado. Kelly N0VD invited me to come over. First i had to think it over to see if it is possible.

I’ve got kids and a Wife that has to agree with this holiday.

We discuss it a lot on sky and msn to see in which time segment it can be done. Also his girl friend agreed with my visited…

Woodland

 

About 300 qso’s are made. If you like to have the Qsl card. It can be send direct or via the Bureau.

Here some pictures form the area in Wooland Park. Real amazing is Pikes Peak. If you there you really need to go up that mountain.

P1010316 P1010327 P1010320 P1010316

A special thanks to Kelly and Christine for there hospitality. Its been a great 14 days. And i will be back someday.!!

 

 

73″ and till PJ2T in October.

 

W0/PE2MC Marco

Tags: , , , ,

Author: pe2mc


Posted on: 7th May 2013

4 Comments

Category: News, Station ,Amature

north-korea-flag-photos
A well known group of DX’ers say that they are working on getting permission to operate from North Korea which is the most wanted DXCC entity in the world. Amateur Radio
Newsline’s Cheryl Lasek, K9BIK, reports:

The Intrepid-DX Group, in partnership with the World-Wide DX Group says that for the past four years that they have been working with professionals in the business and tourism industries who are actively doing business in North Korea.

In a widely circulated press statement the organizations note that they have prepared a comprehensive, multi-faceted proposal, which has been delivered it to the North Korean officials via their emissary located in Chinese. Also that several members of the combined groups leadership and advisory team have made multiple visits to the region and are advising the overall groups accordingly.

The DXers say that they are using the same techniques that were successful in opening up Kurdistan, the South Sudan and Yemen to DXpedition activity. They add that they are leveraging their ideas and contacts towards the goal of a major DXpedition over a four week period from within the North Korea border. As we go to air, no date for such an operation to take place has even been speculated.

For the Amateur Radio Newsline, I’m Cheryl Lasek, K9BIK, in
Zion, Illinois.

Bron: AR Newsline

Tags: , , , , , , , , , , , , , , , , ,

Author: pe2mc


Posted on: 7th May 2013

1 Comment

Category: News, Station ,Amature

ylday2013-150x117On 18 and 19 May, is “The Day of the YL’s” held for the 3rd time. This weekend is intended to give and get all the female colleagues in the air to have a chat. Opportunity to all women of radio amateurs around the world Of course, all OM are also invited to participate. Part in this contest

The contest will be held from May 18 to May 19 at 06:00 UTC and 18:00 UTC contains only the primary HF bands place, though there will be this year for the first local activities take place on the 2-meter band. The modes CW, SSB and RTTY are allowed and the exchange is YL or OM.

 

Video not available

 

 

 

 

Tags: , , , , , , , , ,

Author: pe2mc


Posted on: 28th March 2013

7 Comments

Category: News, Station ,Amature

Raspberry Pi as Remote Server for RTL2832u SDR

As the raspberry pi can be used by several projects. I already 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 receiving 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.

Get 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 libusb-1.0-0.dev
sudo apt-get install build-essential

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

git clone git://git.osmocom.org/rtl-sdr.git
cd rtl-sdr/
mkdir build
cd build
cmake ../
make
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 10.0.1.50
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.
Bron: http://www.hamradioscience.com/raspberry-pi-as-remote-server-for-rtl2832u-sdr/

Tags: , , , , , , , , , , , , , , ,