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Passive RF filters, Accessories |
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Filters are essential accessories on any radio station in nowadays crowded bands to avoid interference from/to other stations or radio services.
Necessary complement of popular T-Match ATUs.
All products are engineered and manufactured in the UK.
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0 to 71dB Precision Ladder Attenuator
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Based on Minicircuits PAT+ series, miniature ceramic fixed attenuator, gives a precise reference of attenuation to your measurements.
Features 0dB to 71dB in 1 dB step attenuation through eight high quality low stray capacitance STS, Subminiature Toggle Switches, to switchover 1dB-2dB-3dB-5dB-10-dB-10dB-20dB-20dB.
Usable up to 2.5GHz
Power Rating: 1Watt
Impedance: 50 Ohm.
Set of coaxial patch leads included.
External Dimensions: (H,W,D): 30x37x148mm.
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Precision Ladder Attenuator
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£ 80.00
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Impedance Adapter for longwire or beverage antenna.
To connect an auxilliary longwire or beverage antenna on table-top or portable receivers.
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Provides the impedance match for the high Z that present wire antennas.
A special designed broadband toroidal transformer provides the impedance match between the antenna and the 50 ohm input impedance of receivers.
Ideal for connect an auxilliary longwire or beverage antenna on table-top receivers or for portable operation.
Gas Discharge Tube safeguard.
4 mm. banana/screw post for the wire antenna side connection.
BNC connector on 50 Ohm Receiver side.
Earth post.
Frequency: HF 0.1MHz to 30MHz.
Power rating: Reception.
External dimensions (H,W,D): 30x55x37mm. |
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Impedance Adapter - High Z to 50 Ohms |
£ 45.0 |
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BCB, Broadcast Band rejection High Pass Filters
(Brick-Wall filter)
Suitable for inserting between transceiver and antenna.
No relays are needed.
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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 allow 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 between 1.7MHz and 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.
Suitable for inserting between transceiver and antenna, no relays are needed.
Features:
Impedance: 50 Ohm.
Connected in-line with any 160 - 10 Meter (1.8 - 30 MHz) HF transceiver - transmit right through it on any HF ham band above 1.8 MHz.
Compatible with output from a typical 100 Watt class HF transceiver. (High Power model)
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 moving parts.
Uses no relays.
Requires no connection to a power source.
Instantly switches from transmit to receive and back again. No relay time delays.
Filter Specifications:
Power rating: on model
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)
Two models available:
- BCB filter, Power rating Reception-QRP-10Watts max.
BNC connectors.
Suitable to be connected in-line with a 1.8MHz through 30 MHz HF QRP Exciter, transmitting through it without switching relays.
Set of coaxial patch leads included.
External dimensions (H,W,D): 30x37x111mm.
- BCB filter, Power rating 100 Watts for HF Transceivers.
UHF connectors. Earth terminal.
Suitable to be connected in-line with a 1.8MHz through 30 MHz 100 watts HF transceiver, transmitting through it without switching relays.
Set of coaxial patch leads included.
External dimensions (H,W,D): 50x55x148mm.
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(Click on picture to enlarge.)
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Filters plot showing the signal frequency versus the amplitude response .
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BCB Filter QRP-10Watts |
£ 65.0 |
BCB Filter 100Watts HF transceiver
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£ 80.0 |
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Two Path RF Relay for In Line Insertion
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It is designed to by-pass any device in line with your transceiver.
A typical application includes inserting between antenna and transceiver a preselector, preamplifier or filter devices.
It is by-passed on transmission switchover avoiding being overloaded.
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Frequency range: DC - 60MHz
Insertion loss: 0.2 dB @ 50 MHz
Isolation: 60 dB @ 50 MHz
Power rating: 200 W PEP
Impedance: 50 Ohm
SWR: 1.22 @ 50MHz
Voltage /current: 12 Volts DC/65 mA
Switching time:
- Set: 15mS
- Reset: 5mS
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External Dimensions: 40x37x111mm.
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Diagram
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Two Path RF Relay
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£ 95.00 |
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Relay Sequencer Control Unit
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The control unit performs timing and power to the Two Path RF Relay or other kind of RF relays.
Protects the RF Relays from hot-switching , which damage the contacts,and the attached device, allowing to the relays enough time to switch and be ready before apply RF.
Activated from PTT switch, or auxiliary pedal or key/keyer.
High accuracy switching delays thanks to use a microcontroller with quartz crystal to generate precise time base.
Provides an auxiliary galvanically isolated 2Amp. SPDT contact.
Inputs from: Transceiver microphone with PTT, pedal or key/keyer.
Outputs to: Transceiver microphone with PTT, RF relay and auxiliary SPDT contacts.
Voltage: 12VDC.
External Dimensions: (H,W,D): 50x55x148mm.
Foot Switch included:
Robust momentary action foot operated switch with non slip base.
Supplied with 1.7m lead terminated to a 3.5mm jack plug.
Dimensions 74 x 75 x 32mm.
Rated 3A 250V AC.
Foot Switch ans set of cables included. |
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