Архив за 27.11.2017

What is the difference between using a Ham Radio and a rtl-sdr dongle?

As the title states I do not know what the difference would be. I understand that an RTL-SDR connects to your computer and that a ham radio is it's own peice of equipment, but other than that what would be the major differences and which would you recommend for a beginner?

submitted by /u/Master1243
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Troubleshooting Help • Purpose of USB Isolator

What do you hope to gain by using a USB isolator?

From my understanding USB isolator are intended to provide galvanic isolation for the USB Ports only, e.g. for medical purposes, but are also used by audiophiles.

Optical Isolator are in my understanding not intended to necessarily eliminate noise and other interferences on the USB Data and power line, only to provide galvanic isolation.

You can read the details of a galvanic seperated isolator using the ADuM3160, which combines high speed CMOS and monolithic air core transformer here http://www.analog.com/media/en/technica ... uM3160.pdf

Then there are also optical isolated versions as discussed in the APPLICATION NOTE 3891 Isolating USB by Maxim https://www.maximintegrated.com/en/app- ... vp/id/3891

Depending on which DC/DC and signal shaping circuits are used interference may be reduced or additional interference is added.

Since the power supplied by your isolator to the RTL Dongle is not sufficient, you could think about adding a DC isolator (power lines cut) and add a 5V battery powered power supply using a low noise linear volatge regulator for test purposes after your isolator to see if it improves performance as you hope.

Please post your progress and success.

Statistics: Posted by snn47 — Mon Nov 27, 2017 8:57 pm

Antennas • Nagoya Antenna

I am using a Nagoya UT106 mag wip placed on my house roof.
It works amazingly well.
The mag base is the same size as the original stubby wip that came with my RTR-SDR
Was wondering if there is a airband tuned wip available that would screw onto the now spare base.

Statistics: Posted by rocky28965 — Mon Nov 27, 2017 8:48 pm

Troubleshooting Help • Some USB 2.0 Isolator

I just did a quick check and found a cheaper one that is USB 2.0 only https://www.reichelt.de/?ARTICLE=179183 ... gKdOPD_BwE
for 249 €.

Some are based on Analog Devices ADuM3160.

The chip is only 7,30 €? https://www.reichelt.de/?ARTICLE=113597 ... gKKAvD_BwE

The Evaluation PCB USB Isolator ADuM3160/4160 - EVAL-ADUM4160EBZ is 77.21 € https://www.eibtron.com/epages/eibtron. ... ID=1556043

With a different PCB and presoldered parts, except DC/DC converter, for 34.50 €. http://www.watterott.com/index.php?page ... &info=3887

Product description
USB port isolator based on an Analog Devices ADuM3160 to protect computers against over-voltage spikes, ESD pulses and to avoid ground loops.
All SMD parts are presoldered, you only have to solder the THT DC/DC converter.

USB 2.0 compatible
Full Speed (12 Mbps) and Low Speed (1.5 Mbps) switchable via soldering Jumper
Built-in DC-DC converter (up to 400mA output current on Host side)
No external power supply requiered
Based on Analog Devices ADuM3160
USB-Device: microUSB

Statistics: Posted by snn47 — Mon Nov 27, 2017 8:31 pm

Comment on Potentially Receiving up to 10 GHz with an RTL-SDR and Multiple SUP-24000 Downconverters by Paolo

I bought the sup-2400, but I never received it

Meteor M 2-1 ready for launch tomorrow.

If all goes well, we will have another Meteor Weathersat.


Jeff K2SDR

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Comment on TempestSDR: An SDR tool for Eavesdropping on Computer Screens via Unintentionally Radiated RF by someone

Yup, both the mingw/bin and msys/1.0/bin folders are in the path.

Привет всем. подскажите какой нормальный сдр приемник взять что бы принимал от 100кгц без конвертера?…

Привет всем. подскажите какой нормальный сдр приемник взять что бы принимал от 100кгц без конвертера?

Comment on TempestSDR: An SDR tool for Eavesdropping on Computer Screens via Unintentionally Radiated RF by Giorgio IZ2XBZ

I’m not able to install MingW32: installers are not working as they cannot donwload packages, can someone make me a zip of all required files please?

Giorgio IZ2XBZ

Comment on RTL-SDR Tutorial: Decoding Inmarsat STD-C EGC Messages by Günter

i want built a inmarsat dish antenna – now i look for the best solution – shold i use a Helix or a Outernet patch?

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