Radio Test Equipment - 1 March 2017

Please email or phone for a quote or to place an order by credit/debit card or for a Paypal money request. Purchase of several items is likely to make a saving on postage. Tel 01305 262250

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

Technical queries to  tony@spectrumcomms.co.uk 




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 £50.50 UK, £56.50 EU tracked, £59.00 World. Ready built £71.50 UK, £79.75 EU, £82.50 World.  Price include tracked carriage.

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G4CFY NOISE BRIDGE, 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 £13.25 UK, £15.25 EU, £16.25 World.  PCB kit plus switches, connectors and fixings £17.00 UK, £19.00 EU, £20.00 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 £74.00 UK, £83.50 EU, £87.50 World, including tracking.

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LCR BRIDGE  with 5 resistance ranges, 100, 1K 10K 100K, & 1M.  3 capacitance ranges, 100pF, 1nF, 10nF, and 3 inductance ranges 1mH, 10mH, & 100mH, plus an external reference.  Scale calibrated 0.01 to 10 times reference value.  Optional drilled and labelled plastic or diecast box.  

Full kit with plastic box £48.00 UK, £54.00 EU, £56.50 World.  Full kit with diecast box £61.00 UK, £70.50 EU, £74.50 World.  Ready built in plastic box £69.00 UK, £77.25 EU, £80.00 World.   Ready built in diecast box £82.50 UK, £91.50 EU, £95.50 World.  All include tracked carriage.

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.



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. PCB kit £12.50 UK, £14.25 EU, £15.25 World, tracking £5.50 extra.  Box kit with all hardware £37.50 UK, £43.50 EU, £46.00 World, tracked.  Ready built £59.50 UK, £67.75 EU, £70.50 World, including tracked carriage.

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