RF Accessories  

Range of Pre-filtered RF Preamplifiers

Range of high performance Pre-Filtered RF Preamplifiers suitable for a wide range of applications such as signal booster for radio receivers, measurement applications, RF Generators, Local oscillators, RF amplifiers, RF mixers, etc.

It incorporates an embedded 7th order Elliptic Low Pas Filter prior the preamplifier in order to limit the gain of the amplifier to the pass band of the filter.

Eleven filter frequencies to chose:

- 300KHz
- 600KHz
- 1.5MHz
- 3MHz
- 6MHz
- 15MHz
- 30MHz
- 60MHz
- 150MHz
- 300MHz
- 500MHz

Switching to OFF state the unit is by-passed.

Features:

- Input/Output impedance: 50 Ohms.
- Input power: 10dBm max.
- Gas discharge tube on Input port to surge suppression.
- Passive, 7th order, Elliptic Low pass filter.
- High performance low noise preamplifier. Gain 25dB, IP3 38dB, Noise figure 2.7dB.
- By-Pass amplifier feature using high isolation, low insertion loss, 50 Ohms set of RF relays.
- Power supply includes protection and decoupling.
- ON/OFF switch. 3mm LED signaling ON state. In OFF state the unit is by-passed.
- Power: 11V-14V DC/100mA.
- Size: 55x111x40mm (2.16x4.37x1.57in)
- Coaxial cable tails and power cable included.
- Connectors: BNC standard; N, SMA or combined types available.

Customize versions available Please ask.

Divides a single signal path in two ones, enabling to connect two radio receivers to a single antenna feed line.

The antenna and each receiver have a 50Ω characteristic impedance. They can not be connected with a coaxial "T" connector ( a common misconception).
The reason is that the impedances at all connection points must be set at the correct 50Ω in order to avoid desensitation, intermodulation, and other undesirable effects due the resultant impedance mismatch.

Typical use includes either combining two antennas for one receiver, or if you have two receivers that you want to share on one antenna.
An important performance of the Antenna Splitter is its Output1 to Output2 isolation in order to avoid coupling between receivers when you are sharing the same antenna. This is specially important on SDR receivers due their tendency to radiate back to the antenna spurious signals from quadrature mixers.

	Connection diagram. (Click on picture to enlarge)

		They are two models available:
	Splitter model VLF. Features: - Power Rating: 1 Watt (Max) - Operating frequency: 4KHz to 60 MHz - Impedance: 50 Ohms - Insertion Loss (dB): Typ. Max.  0.004 - 0.04 MHz:      0.3 0.6  0.04 - 30 MHz:          0.3 0.6  30 - 60 MHz:             0.6 1.0 - Isolation (dB): Typ. Min.  0.004 - 0.04 MHz:      27 20  0.04 - 30 MHz:          30 20  30 - 60 MHz:             27 20 - Phase Unbalance: - 0.004 - 0.04 MHz:      2.0 (Max) - 0.04 - 30 MHz:          3.0 (Max) - 30 - 60 MHz:             4.0 (Max) - Amplitude Unbalance:   0.004 - 0.04 MHz:      0.15 dB (Max)  0.04 - 30 MHz:           0.25 dB (Max)  30 - 60 MHz:              0.30 dB (Max)		Splitter model HF. Features: - Power Rating: 1 Watt (Max) - Operating Frequency: 100KHz to 400 MHz - Impedance: 50 Ohms - Insertion Loss (dB): Typ. Max.  0.1 - 1 MHz:      0.2 0.6  1 - 200 MHz:     0.4 0.75  200 - 400 MHz: 0.6 1.0 - Isolation (dB): Typ. Min.  0.1 - 1 MHz:      20 15  1 - 200 MHz:     25 20  200 - 400 MHz:  25 20 - Phase Unbalance:  0.1 - 1 MHz:      2.0(Max)  1 - 200 MHz:     3.0 (Max)  200 - 400 MHz:  4.0 (Max) - Amplitude Unbalance: 0.3 dB (Max)

	Customize versions available Please ask.
	Antenna Splitter model HF	£ 75.00
	Antenna Splitter model VLF	£ 95.00
	Order

The Antenna Splitter & By-Pass Relay combines a transceiver and a receiver on a single antenna, enabling simultaneous reception on both radios.
On transmission switch-over the receiver is disconnected fron the antenna.

It includes two main circuits: a passive splitter and a set of RF power relays rated for 150Watts PP.

Specialised high performance, high isolation, low insertion loss, 50 Ohms set of RF relays are used in order to keep impedances and large isolation between Input/Outputs.

The relays are activated from the transceiver, via delayed transmission switch over command line.

WARNING TO AVOID DAMAGE THE UNIT!
In order to give enough time to the relays to switch before the RF power signal outputs the transceiver when the PTT is pressed, assure that your transceiver provides a delayed "SEND" control line signal.
Alternatively a TX/RX Sequencer can be used.

They are two models available depending on the passive splitter:

- VLF- LF-HF 4KHz - 60MHz.

- HF-VHF 100KHz - 400MHz.

Below an example the diagram showing how to get Panoramic feature combining a transceiver and a SDR radio.

Antenna Splitter & By-Pass Relay. Connection diagram.
(Click to enlarge)

Antenna Splitter & By-Pass Relay. Simplify diagram.
(Click to enlarge)

Splitter model HF. Features:

- Power Rating: 1 Watt (Max)
- Operating Frequency: 100KHz to 400 MHz
- Impedance: 50 Ohms

- Insertion Loss (dB): Typ. Max.
 0.1 - 1 MHz:      0.2 0.6
 1 - 200 MHz:     0.4 0.75
 200 - 400 MHz: 0.6 1.0

- Isolation (dB): Typ. Min.
 0.1 - 1 MHz:      20 15
 1 - 200 MHz:     25 20
 200 - 400 MHz:  25 20

- Phase Unbalance:
 0.1 - 1 MHz:      2.0(Max)
 1 - 200 MHz:     3.0 (Max)
 200 - 400 MHz:  4.0 (Max)

- Amplitude Unbalance: 0.3 dB (Max)

  Features:

- Frequency range: 4KHz - 60MHz or 100KHz-400MHz.
- Insertion loss Reception: 3dB
- Insertion loss Transmission: 0.005dB
- Transmission/Reception isolation: >110dB
- Power rating Transmission: 150 W PP max.
- Impedance: 50 Ohms
- Relays switching time:
- Set: 5mS
- Reset: 4mS
- Diode protection.
- Power supply: 12 Volts DC/60 mA (activated)
- Size: 73x110x40mm(2.87x4.33x1.57in)
- Connectors: SO-239 or N type for Antenna&Transceiver; BNC for Receiver.
- Shielded control cable with snap-on RFI-EMI suppressor ferrite cores included.

          Combined type of connector configurations also available. Please ask.

Splitter model VLF. Features:

- Power Rating: 1 Watt (Max)
- Operating frequency: 4KHz to 60 MHz
- Impedance: 50 Ohms

- Insertion Loss (dB): Typ. Max.
 0.004 - 0.04 MHz:      0.3 0.6
 0.04 - 30 MHz:          0.3 0.6
 30 - 60 MHz:             0.6 1.0

- Isolation (dB): Typ. Min.
 0.004 - 0.04 MHz:      27 20
 0.04 - 30 MHz:          30 20
 30 - 60 MHz:             27 20

- Phase Unbalance:
- 0.004 - 0.04 MHz:      2.0 (Max)
- 0.04 - 30 MHz:          3.0 (Max)
- 30 - 60 MHz:             4.0 (Max)

- Amplitude Unbalance:
  0.004 - 0.04 MHz:      0.15 dB (Max)
 0.04 - 30 MHz:           0.25 dB (Max)
 30 - 60 MHz:              0.30 dB (Max)

General purpouse antenna relay designed for 50Ω impedance lines appropiate to reception and transmission up to 150 watts PEP.
A control line permits switch ON of OFF the Antenna relay. It can be activated via PTT or Keying line from a transceiver or transmitter.

WARNING TO AVOID DAMAGE THE UNIT!
In order to give enough time to the relays to switch before the RF power signal outputs the transceiver when the PTT is pressed, assure that your transceiver provides a delayed "SEND" control line signal.
Alternatively a TX/RX Sequencer can be used.

Features:
- Frequency range: DC - 60MHz
- Insertion loss: 0.2 dB @ 60 MHz
- Isolation: 40 dB
- Power rating: 150 W PP
- Impedance: 50 Ohm
- SWR: 1.22 @ 60MHz
- Diode protection.
- Power supply: 12 Volts DC/36 mA (Active state)
- Switching time:
- Set: 7mS
- Reset: 2mS
- Life expectancy (Mechanical): 20,000,000 operations (at 18,000 operations/hr)
- External Dimensions: 40x37x111mm.
- Connectors: SO-239 standard or customer choice.
- Shielded control cable with snap-on RFI- EMI suppressor ferrite cores.
- Size: 73mmx37mmx40mm( 2.87x1.45x1.57in)

Simplify diagram

Connection diagram

Switching antennas diagram

General purpose SPDT solid state RF switch (no relays) for telecomunications applications.

100 Watts Broadcast Band Rejection filter.BCB filter. (No relays)

Features:

Attenuates signals from the AM broadcast band more than 80 dB.
Connected in-line with any 160 - 6 Meter (1.8 - 60 MHz) HF transceiver, transmits right through it on any HF ham band above 1.8 MHz

No switcing relays, no moving parts. No relay time delays.
Compatible with the output of a typical 100 Watt class HF transceiver.

Suitable for inserting between a HF transceiver and an amplifier or a tuner.
Totally passive design, T/R (Transmit/Receive) operation.
Does not require connection to a power supply.
Instantly switches from transmit to receive and back again.

Specifications:

- Power rating: 100Watts
- Frequency range: 1.8MHz-60MHz
- Impedance: 50 Ohm.
- T130 size toroidal cores.
- 1% tolerance Silvered mica capacitors.
- Pass band loss: < 0.85dB (1.8MHz )
- Pass band Loss: < 0.25dB (3-60MHz)
- Max attenuation: > 80dB
- Return loss: > 20dB (1.8 MHz through 30 MHz)
- Connectors option: SO-239 or N
- Size: 148mmx55mmx50mm(5.827x2.165x1.969in)

Attenuates the spurious signals from AM broadcast band, well know enemies of SW receivers, that cause birdies and IMD, overloading and de-sensing receiver front-ends.
This filter allows to work all of 160 Meters, including the CW portion of the band without the interferences normally experienced by receivers due to overload from the strong commercial AM broadcast band signals
Very sharp slope occurring at 1.8MHz, keeps without attenuation all signals at 1.8MHz and above, including the CW portion of the 160 meters band.
Low pass band insertion loss, less than 1 dB @ 1.8MHz typical and flat pass band response.
No relays are needed.
Suitable for inserting between transceiver and antenna.

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 complies with specifications USB 1.1,
Low speed (1.5Mbit/s) and USB 2.0 Full Speed (12Mbit/s). 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:

Isolation 1.000 Volt AC
Protection: EMC, ESD, Overvoltage Surge, Short-circuits.
Power supply: PC side 5VDC, Self powered. Attached signaling LED.
Drawn power from peripheral radio: 5V DC/100mA max.
USB modes: Full speed (12 MBit/s) Low speed (1.5 MBit/s). 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)
USB2 pair of cables included.

Peripheral side
Type A USB socket

Interconnection

Connectors: SO-239 -BNC - N - or customer choice.

10KHz to 60MHz Antenna Galvanic Isolator System for SDR radios

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 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 winded on a large core is used in order to avoid be saturated due excessive level of RF signals.
In addition gas discharge tube is included in order to minimize static damage.

- Frequency range: 10KHz to 60MHz
- Insertion loss: 0.5dB typical.
- Power rating: 10Watt.
- Input/Output impedance: 50 Ohm..
- Connectors: SO-239 -BNC - N - or customer choice.
- Gas discharge tube for static discharge to earth.
- Earth terminal post for a separate earth connection.
- Enclosure:ABS material rated to UL 94V-0. Protection IP54.
- Size: 86mmx57mmx36mm( 3.4x2.2x1.4in)

Customize versions available Please ask.

	Antenna Isolator .	£ 46.00
	Order

Connectors: BNC - SMA - N - or customer choice.

VHF-UHF-SHF Antenna Galvanic Isolator System for SDR radios

VHF-UHF-SHF Antenna Galvanic Isolator System for SDR radios

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 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 high noise rejection, depending on installation.

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

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

- 20MHz - 1200MHz
  1.2dB (Typ.)
  1.7dB (Max.)
- Connectors: BNC - SMA - N - or customer choice.
- Enclosure Size: 55mmx37mmx39mm( 2.16x1.45x1.53in)

Customize versions available Please ask.

	VHF-UHF-SHF Antenna Isolator .	£ 65.00
	Order

Impedance Adapter for Long Wire Antenna. Galvanically isolated

A receiving antenna impedance transformer, 9:1 ratio, to match a Longwire antenna to 50 ohm coaxial feeder.
The coaxial feeder primary winding is isolated from the antenna to avoid ground loops on SDR radios, mains noise and antenna interaction. It allows to use coaxial feeder cable without antenna tuner.
A high isolation broadband transformer winded on a large core is used in order to avoid distortion products due excessive level of RF signals.
In addition gas discharge tube is included in order to minimize static damage.

- Frequency range: 100KHz to 30MHz
- Impedance ratio: 9:1; 50 Ohm to 450 Ohm.
- Power rating: 1Watt.
- Connectors: SO-239 Receiver side; Binding post Antenna side .
- Earth terminal post for antenna earth connection.
- Gas discharge tube for static discharge to earth
- Enclosure:ABS material rated to UL 94V-0. Protection IP54.
- Size: 86mmx57mmx36mm( 3.4x2.2x1.4in)

Customize versions available Please ask

The vector network analyzer plot below shows VSWR response.

Mini LPF filters catalog

Range of eleven Low Pass Filter covering from 300KHz to 500MHz

Esential on measurement applications, suitable for Receivers , RF Generators, Local oscillators, RF amplifiers, RF mixers.

- Topology: Passive, 7th order, Elliptic
- Input/Output impedance: 50 Ohm.
- Insertion loss: < 0.3 dB
- Sharp roll-off, Stop band attenuation: see plots.
- Power rating: 27dBm
- Connectors: BNC or SMA available
- Size: 56mmx20mmx20mm( 2.205x0.787x0.787in)

Customize versions available Please ask

Range of frequencies: (3dB cutt-off frequency)

	Mini Low Pass Filter BNC connectors	£ 45.00
	Mini Low Pass Filter SMA connectors	£ 49.00
	Order

Lets to connect a SDR radio to your transceiver as Panoramic adapter.
Measure or display the signal of transmitters.
The Tap attenuator extends the range of measurement of any instrument such as Logarithmic Detectors, Spectrum Analyzers, Oscilloscopes, RF voltmeters, etc
For example if a Logarithmic Detector with +10dBm range is connected to the Tap attenuator if range extends to 50dBm or 100Watts.
Configuration: Three 50 ports. High power Input/Output, 40dB Att. Output.
Power Rating: 150W PP
Frequency response: DC to 500MHz 1dB
Connectors: N (Iput/Output high power); BNC att. output. (SO connectors option)
Size: 110mmx37mmx40mm( 4.331x1.457x1.575in)

Monitoring the RF output of a transceiver or transmitter. Diagram

250 mW Pad attenuators range

Range of attenuators based on Susumu wideband DC to 3GHz fixed PAD series showing excellent high frequency characteristics.
Thin film metalization technology provides very stable characteristics over temperature and time. Esential on measurement applications, suitable for Receivers , RF Generators, Local oscillators, RF amplifiers, RF mixers.
Range of 1dB, 2dB, 3dB, 5dB, 6dB, 10dB, 20dB.

- Impedance: 50 Ohms ± 0.3dB
- Attenuation: nominal.
- VSWR: 1.2 max.
- Power rate: 250mW (24dBm)
- Size: 48mmx20mmx20mm( 1.89x0.787x0.787in)

Customize versions available Please ask.

	Pad attenuator	£ 23.00
	Order

0 - 71 dB Step Attenuator Ladder Configuration

The step attenuator presented here for measurement purposes, is an inestimable tool for accurate control of amplitude levels. In addition, it improves the impedance match between impedance-sensitive devices, such as amplifiers, oscillators and filters, lowering the VSWR of components connected in cascaded mode by providing isolation between the impedances.
Furthermore, the step attenuator is suitable for receiver front-end protection or as calibrated attenuator for receiving performance evaluation.
The attenuator in ladder configuration uses eight high quality low stray capacitance double pole double throw (DPDT) toggle switches to select different amounts of attenuation. The unit provides 0-71 dB of attenuation in 1 dB step.
Based on Minicircuits PAT+ series, wideband DC to 7GHz fixed ceramic attenuator cells of 1dB-2dB-3dB-5dB-10dB-10dB-20dB-20dB, it gives a precise reference of attenuation
BNC connectors protected with no short-circuited metallic dust caps are used at each end of the attenuator.
Features:
Power rating: 1-Watt maximum.
Impedance: 50 Ohms
External Dimensions: 148mmx37mmx30mm(5.827x1.457x1.181in)

  Manual

General purpose measurement bridge
The Mini-Z Bridge is a general purpose measurement bridge designed to be allocated near the DUT with shorten connections.
As general purpose bridge it can be use together with other measurement instruments up to 100MHz. It is capable of being used up to 150MHz.

Features:
- Impedance: 50
- Range: 50KHz to 100MHz (usable up to 150MHz)
- Directivity: Better than 50dB@50MHz; 40dB@100MHz
- Insertion loss: 13dB
-Size: 55mmx37mmx20mm (2.165 x 1.457x 0.787 in)
-Connector Options: SMA, BNC or combination of both.

 Data sheet

PTT foot switch

Robust momentary action foot operated switch with non slip base.

• 1.8m cable length.
• Standard 3.5mm jack plug. Other connectors available, Please ask.
• Dimensions 74 x 75 x 32mm
• Rated 3A 250V AC