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  USB Galvanic Digital Isolator for SDR radios  
         
 

USB Galvanic Digital Isolator for SDR radios

The USB Galvanic Digital Isolator for SDR radios is designed to break
the galvanic connection between USB host PC and the attached SDR
radio peripheral avoiding that whatever power and ground noise from
the PC side do not influence the sensible radio on the other side.

The resultant galvanic isolation improves common-mode voltage,
prevents ground loops, a common cause of interference and data
distortion issues, improves reception, as the noise floor in the receiver
is lowered, and removes spikes and birdies on the PC panoramic
screen. In addition provides isolation of 1000V AC between the host PC
and the radio peripheral that guard against surges that may come from
the antenna connected to the receiver.

The USB Galvanic Digital Isolator for SDR radios is based on ADuM 4160
Full/Low Speed 5 kV USB Digital Isolator and ADuM 5000 Isolated DC-to-DC Converter both from Analog Devices combining high speed CMOS and chip-scale air transformer iCoupler technology.

The USB Galvanic Digital Isolator complies with specifications USB 1.1,
Low speed (1.5Mbps) and USB 2.0 Full Speed (12Mbps). The speed
mode is set manually via two jumpers inside (default full speed). Most
of the time it is not necessary change between modes but if automatic
speed detection is desired, an external hub can be connected to the peripheral side configured for full speed.

The USB Galvanic Digital Isolator is self powered from the host PC through the USB cable. An embedded DC/DC converter provides a galvanic isolated voltage of 5VDC/100mA to the peripheral side. It includes additionally ESD,EMC protection of the data lines and power transient short-circuit guard.

It is highly advisable not to power any part of the connected radio from the USB bus, instead an external dedicated power supply must be used.

The USB Galvanic Digital Isolator behaves like an USB cable, no USB drivers are needed. It works on all operating systems, Mac, Windows,Linux, etc.

Features:
No suitable for High Speed USB mode devices
Isolation 1.000 Volt AC
Protection: EMC, ESD, Overvoltage Surge, Short-circuits.
Power supply:
- PC side: From USB cable, 5VDC. Attached signaling LED.
- Drawn power from peripheral radio max: Through USB cable, 5V DC/100mA max.
USB modes: Full speed (12 Mbps) Low speed (1.5 MBps). Switchable.
Standard socket connectors: PC side: USB type B, peripheral side: USB type A.
Dimensions 67 mm x 66 mm x 28 mm.(2.638x2.598x 1.102inch)
USB 2.0 pair of cables included.

 

 

 

Peripheral side
Type A USB socket

 

Manual

USB Galvanic Digital Isolator manual(web)

 
         
 

Application example. A creative portable SDR set-up by Thomas from The SWLing Post.

Link

(Click on the picture to link)

 

 

  USB Galvanic Digital Isolator for SDR radios; SKU: HS-150 £ 79.00 Order  
The set includes:
USB Galvanic Digital Isolatorand user manual in CDROM format and two USB 2.0 cables.
     

  Audio Line Galvanic Isolator. Two channels.  
         
 

 

 
         
 

Suitable for SDR radios, on ultrasonic applications and audio systems.

 The Audio Line Galvanic Isolator removes inherent ground coupling noises providing isolation between input/output unbalanced connected interfaces. It is a differential responding high common mode rejection device that removes Hum and Buzz artifacts enhancing signal quality by reducing spectral contamination due RF interference.
On Software Define Radio applications where a computer sound card is used to sample I/Q signals, ground loops are very common through receiver between USB connection and sound card (spikes on screen) This kind of ground loop issue can be solved galvanically isolating the path between the receiver I/Q outputs and the sound card inputs.
The Audio Line Galvanic Isolator is built around two broadband high linearity, low distortion, MIL spec broadband transformers. Transformers make excellent ground isolators. They transfer signal voltage from primary to secondary without any electrical connection between them breaking the path of the noise current that would otherwise flow between interface devices.

The Audio Line Galvanic Insulator is shielded in metal case. In addition internal transformers are covered with μ-metal EMI shielding case that virtually eliminate any electromagnetic interference from nearby sources.
Input/output connector ports are Rean-Neutrik Tiny XLR improving the device shielding due their high noise immunity and EMI protection. The socket free rugged locking mechanism provides secure and reliable connection.
Input and output device ports can be configure by means of jumper links:


Input configurations available:
Input impedance 600Ω
Unbalanced-input ground. Unbalanced-floating input ground. Balanced.

Output configurations available:
Load impedance 600Ω or Hi Z , configurable.
Unbalanced-output ground. Unbalanced-floating output ground. Output ground to case chassis (Earth). Balanced.

Professional grade input/output cable tails for interface connection are included. Default cable configuration is unbalanced, 3.5mm stereo jack ending. Other cable options available please ask.

Technical specifications:

- Passive device. Two channels.
- Input Z: 600Ω
- Output Z: 600Ω/Hi Z load, configurable.
- Case chassis screw for Earth connection.
- Broadband frequency response @ ± 2dB: 300Hz-100kHz
- Power level: 50mW
- Isolation test: 1000 VRMS/1 sec
- Working voltage: 150VDC
- Size: 111mmx37mmx30mm (4.37x1.45x1.18in)

 
     
  High quality Input/Output professional cable tails are included.   Configurable input and output ports by means of jumper links.  
  Audio Line Galvanic Insulator ; SKU: HS-160 £ 120.00 Order  
The set includes:
Audio Line Galvanic Insulator user manual in CDROM format and two professional grade cables tails.
     

  VHF-UHF-SHF Antenna Galvanic Isolator. 20MHz-1.3GHz  
 
     
 



Plot
Response plot
(click on image to enlarge)


 

 

Rejects pick-up noise from the antenna feedline by removing ground loops.

The broadband antenna isolator allows isolate the antenna galvanically from the receiver; only magnetic signal is coupling from the antenna.
Ground loops in SDR radios induced by the antenna feeder is very common if the computer ground is connected to the radio system.
This type of ground loop issue can be solved by using galvanic isolation between the receiver earth system and the antenna earth.
In most receiver installations the antenna coaxial feeder is connected to mains earth at the receiver side. This can cause mains noise to enter into the receiver because either the feeder mains earth line is the return path for the antenna or noise being coupled to the antenna and radiated.
The Antenna Isolator can achieve high noise rejection, depending on installation.

- Frequency: 20MHz - 1200MHz
- Nominal impedance: 50Ω
- Impedance ratio: 1:1
- Power rating: Reception 0.25Watts (max)
- DC current: 30mA (max)

- Insertion Loss: 100MHz - 350MHz
  1.1dB (Type)
  1.6dB (Max.)

- 20MHz - 1200MHz
  1.2dB (Type)
  1.7dB (Max.)
- Connectors: BNC
- Enclosure Size: 55mmx37mmx39mm( 2.16x1.45x1.53in)

 

 

Manual
User manual

 
VHF-UHF-SHF Antenna Galvanic Isolator 
  VHF-UHF-SHF Antenna Galvanic Isolator ; SKU: HS-120 £ 89.00 Order  
The set includes:
VHF-UHF-SHF Antenna Galvanic Isolator and user manual in CDROM format.
     

  10KHz to 150MHz LF-HF-VHF Antenna Galvanic Isolator. Indoor mounting  
         
 
SO239 connectors option.
BNC connectors option.
N connectors option.
 

 

Rejects pick-up noise from the antenna feedline by removing ground loops.

Specifically recommended to work with SDR radios.
Suitable for analogue radios.
Indoor mount.

The indoor broadband antenna isolator allows isolate the antenna galvanically from the receiver; only magnetic signal is coupling from the antenna.
Ground loops in SDR radios induced by the antenna feeder are very common if the computer ground is connected to the radio system increasing local background noise.
This type of ground loop issue can be solved by using galvanic isolation between the receiver earth system and the antenna earth.
In most station installations the antenna coaxial feeder is connected to mains earth at the receiver side. This can cause mains noise to enter into the receiver because either the feeder mains earth line is the return path for the antenna or noise being coupled to the antenna and radiated.
The Antenna Isolator can achieve up to 40dB noise rejection, depending on installation.
It embedded a high isolation broadband transformer wound on a large toroid core 200 Watts power rated .
It includes gas discharge tube as protection against electrostatic discharges.

- Frequency range: 10kHz to 150MHz.
- Flat response along the covered range of frequencies.
- Insertion loss: -2.9dB max@150MHz
- Power rating: 200 Watts PP
- Input/Output impedance: 50 Ohm..
- Connectors: SO-239, BNC, "N" option available.
- Gas discharge tube protection.
- Earth terminal post for antenna separate earth connection.
- Indoor mounting.
- Size: 86mmx57mmx36mm( 3.4x2.2x1.4in)

 

Plot

Response plot
(click on image to enlarge)

 
         
  10kHz to 150MHz LF-HF-VHF Antenna Galvanic Isolator. Indoor. Connector options.  
  10kHz to 150MHz Antenna Galvanic Isolator. Connector option: SO-239 ; SKU: HS-100SO £ 75.00 Order  
         
  10kHz to 150MHz Antenna Galvanic Isolator. Connector option: BNC ; SKU: HS-100B £ 79.00 Order  
         
  10kHz to 150MHz Antenna Galvanic Isolator. Connector option: N ; SKU: HS-100N £ 85.00 Order  
The set includes:
10kHz to 150MHz Antenna Galvanic Isolator and user manual in CDROM format.
     

  10kHz - 60MHz Antenna Galvanic Isolator. Outdoor mounting.  
         
 

 

 

 

 

 


 
Removes local pick-up noise by the antenna feedline.

Specifically recommended to work with SDR radios.
Suitable for analogue radios.

This broadband device allows isolate the antenna galvanically from the receiver; only magnetic signal is coupling from the antenna.
Ground loops in SDR radios induced by the antenna feeder are very common when the computer ground is connected to the radio system increasing strongly local background noise.

This type of ground loop issue can be solved by using galvanic isolation between the receiver and the antenna cable.

In most receiver installations the antenna coaxial feeder is connected to mains earth at the receiver side. This can cause mains noise to enter into the receiver because either the feeder mains earth line is the return path for the antenna or noise being coupled to the antenna and radiated.

The Antenna Isolator can achieve up to 40dB noise rejection, depending on installation.

A high isolation broadband transformer wound on a large toroid core is included in order to avoid be saturated due excessive level of RF signals.

A gas discharge tube device is included as protection against electrostatic discharges.

Features:
- Frequency range: 10kHz to 60MHz.
- Flat response along the covered range of frequencies.
- Insertion loss: < 0.5dB typical.
- Power rating: 200 Watts PP
- Up to 40 dB noise reduction max. (installation depending)
- Input/Output impedance: 50 Ohm.
- Includes gas discharge tube protection
- Weatherproof assembly.
  Connectors:
- "N" or SO-239 options available. ("N" type recommended).
  Enclosure:
  Cover: ABS material rated to UL 94V-0. Protection IP65.
  Chassis: 2mm thick treated Al.

  Stainless still screws.
- Size:

 
  10kHz - 60MHz Antenna Galvanic Isolator. Outdoor mounting options  
  Antenna Galvanic Isolator Outdoor . Connector option: SO-239 ; SKU: HST-212SO £ 125.00 Order  
         
  Antenna Galvanic Isolator Outdoor. Connector option: N ; SKU: HST-212N £ 135.00 Order  
  The set includes:
Antenna Galvanic Isolator. Outdoor mounting, mast clamp and user manual in CDROM format.
     

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