RF Accessories  

100 Watts Broadcast Band Rejection filter (BCB filter)

Features:
Impedance: 50 Ohm.
Connected in-line with any 160 - 10 Meter (1.8 - 30 MHz) HF transceiver, transmits right through it on any HF ham band above 1.8 MHz.
Compatible with output from a typical 100 Watt class HF transceiver.
Suitable for inserting between a HF transceiver and an amplifier or a tuner.
Attenuates signals in the AM broadcast band more than 80 dB.
Totally passive design, T/R (Transmit/Receive) operation.
No switcing relays, no moving parts. No relay time delays.
Does not require connection to a power supply.
Instantly switches from transmit to receive and back again.

General Filter Specifications:
Power rating: 100Watts
Pass band loss: < 0.85dB (1.8MHz )
Pass band Loss: < 0.25dB (3-30MHz)
Max attenuation: > 80dB
Return loss: > 20dB (1.8 MHz through 30 MHz)
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.

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 assembled on a large toroid core (T130) 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: 10KHz to 60MHz
- Insertion loss: 0.5dB typical.
- Power rating: 10Watt.
- Input/Output impedance: 50 Ohm..
- Connectors: SO-239
- 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)

	Antenna Isolator .	£ 46.00
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The vector network analyzer plot below shows the frequency and VSWR response over 10 KHz to 60 MHz range.

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
- Enclosure Size: 55mmx37mmx39mm( 2.16x1.45x1.53in)

	VHF-UHF-SHF Antenna Isolator .	£ 55.00
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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 assembled on a large binocular core (BN43-7051) 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: 10Watt.
- 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)

The vector network analyzer plot below shows VSWR response.

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: >75dB typical.
- Power rating: 27dBm
- Connectors: BNC or SMA available
- Size: 56mmx20mmx20mm( 2.205x0.787x0.787in)

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

	Mini Low Pass Filter BNC connectors	£ 38.00
	Mini Low Pass Filter SMA connectors	£ 43.00
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Lets to measure or display the signal of high power 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: 100Watts
Frequency response: DC to 500MHz 1dB
Connectors: N (Iput/Output high power); BNC att. output.
Size: 110mmx37mmx40mm( 4.331x1.457x1.575in)

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)

	Pad attenuator	£ 23.00
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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-10-dB-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)

  Schematic

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