SPECTRUM COMMUNICATIONS

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RX & TX ACCESSORIES 

25 January 2020

Proprietors;- Mr A.J. Nailer HNC BA G4CFY, Mrs J.R. Nailer. 

12 WEATHERBURY WAY, DORCHESTER, DORSET, DT1 2EF, ENGLAND

Phone UK 01305 262250 International 0044 1305 262250 

Please email or phone for a quote or for a Paypal money request or for bank details. Payment can be by direct bank transfer or by credit/debit card or via Paypal to g4cfy@talktalk.net together with a note stating product required. Purchase of several items is likely to make a saving on postage. You can also obtain products by using my Ebay shop https://ebay.co.uk/str/Spectrum-Comms and pay via Paypal.

Orders & quote requests to  jean@spectrumcomms.co.uk

Technical queries to  g4cfy@talktalk.net 

 

HIGH PASS FILTER HPF175. 

Designed for use where television is broadcast on VHF, such as in some Scandinavian Countries and in Australia. It gives over 60dB of attenuation from DC to 90MHz and even 27dB of attenuation to signals on 146MHz.  The unit does not include a braid breaker and signals could still cause breakthrough due to pick up on the braid of the TV downlead.  Price £17.50 UK, £19.50 EU, £20.50 World. Including P&P.  

 

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HIGH PASS FILTERS HPF450 & HPF550

The HPF450 has passband with a -6dB point at about 450MHz.  It rejects signals from DC to 200MHz by 60dB.  This includes HF, CB, 6m, 4m, 2m, marine,  & taxi.  Passband ripple 455-1000MHz 4dB. The HPF550 is a modified version to allow digital signals above 550MHz to pass and to reduce breakthrough by analogue signals at the bottom of the band. Price £15.50 UK, £17.50 EU, £18.50 World. Including P&P.  

 

VHF FM RADIO FILTER

The BPF-100 has a passband of 80-120MHz to accept the VHF broadcast band and reject above and below this range.  Particularly useful to reduce interference to car radios from engine management units. Available with car radio connectors or with TV connectors for use with aerial fed domestic broadcast receivers. Price £15.50 UK, £17.50 EU, £18.50 World. Including P&P.

 

COAX LEAD TESTER

This handy tester allows cables with PL - PL, or BNC - BNC, or PL - BNC to be tested inner to inner, outer to outer, inner to outer, and also a single end PL or BNC inner to outer.  It should be intuitive, with a wanted connection showing the LED ON and the unwanted connection with the LED OFF.  Price £29.50 UK, £38.00 EU, £40.50 World including tracked carriage.

 

 

CAPACITANCE METER

Direct linear reading in 5 ranges, 100pF, 1nF, 10nF, 100nF, and 1uF full scale.  ABS or stove enamelled diecast box.  12/13.5V operation at 10mA.  Accuracy within +/-2%.  With 13cm (5") probe wires and connectors.  

ABS box kit £47.50 UK, £56.00 EU tracked, £60.00 World. Ready built £62.50 UK, £71.50 EU, £76.00 World.  Price include tracked carriage.

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NOISE BRIDGE

The G4CFY Noise Bridge is used to measure resistance and capacitance of aerials.  also to allow transmitting Amateurs to perfectly match the ATU and aerial system without the need to use a tune transmission.  Useable 1.8 to 70MHz. Noise source when switched on.  Straight through when switched off. Runs for internal 9V PP£ battery. 

Box kit £58.00 UK, £67.50 EU, £71.50 World.  Ready built £86.50 UK, £95.50 EU, £99.50 World, all including tracking.

PEP METER MODULE.  Add-on board for a power meter to enable peak power to be observed.  Derived from a design by John Fielden GW4HAH published in Rad Com in January 1989. Design subsequently found to have a rising reading when idle. Post design component changes solved this and overcame the need for an offset adjust circuit. Board size 46x44x12mm high. PCB kit plus switches, connectors and fixings £12.50 UK, £14.50 EU, £15.50 World.  PCB built with hardware  £16.50 UK, £18.50 EU, £19.50 World.

WIDE RANGE POWER METER

1.8-52MHz in four power ranges 1, 10, 100, and 200W with an accuracy of +/-5%.  Thruline concept with a toroidal current transformer sampling element.  Switched forward and reverse reading.  SO239 connectors. Each unit is individually calibrated on each range. 

Ready Built and calibrated £72.00 UK, £81.00 EU, £85.50 World, including tracking.

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OFF-AIR FREQUENCY STANDARD This is a calibration unit phase locked to Radio 4 on 198kHz using a twin PLL system. It includes a monitor receiver to ensure Radio 4 is being heard loud and clear.  Fixed outputs are 10MHz at 2V p-p, and 1kHz at 1V p-p as an oscilloscope CAL signal.   Switched outputs are 1MHz, 100kHz, 10kHz, and 1kHz at 6V p-p into 500 ohms.  Single board design as featured in July & September 2008 PW.   Background heterodyne whistle at 2kHz confirms lock condition.  12/13.5V DC operation at 65mA.  PCB kit with ferrite rod aerial £61.00 UK, £67.25 EU. Complete box kit £106.50 UK, £112.00 EU.   Ready Built £152.00 UK, £158.00 EU, all include tracked carriage.

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TWO TONE TESTER

A vital test unit for power output, envelope, and carrier suppression testing of AM, DSB, and SSB transmitters. Either 1600Hz or 1800Hz tones or both. Diecast box size 102x84x40mm.  

Box kit with all hardware £35.00 UK, £42.50 EU, £45.00 World, tracked.  Ready built £51.50 UK, £59.00 EU, £61.50 World, including tracked carriage.

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