SPECTRUM COMMUNICATIONS

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RX & TX ACCESSORIES 

19 August 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.nettogether 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 

 

CONTENTS

High Pass TVI Filter 175MHz Capacitance Meter, 1pF to 10uF Two Tone Tester, for transmitter alignment
High Pass TVI Filters 450 & 550MHz Peak Envelope Power module Crystal Calibrator, for receiver alignment
Coax Cable Tester HF Wide Range Power Meter Morse Oscillator

 

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.  

 

HPF small.jpg

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.  

 

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 30.00 UK, 38.50 EU, 42.30 World including tracked carriage.

 

 

CAPACITANCE METER

Direct linear reading in 5 ranges, 100pF, 1nF, 10nF, 100nF, and 1uF full scale.  Supplied in an ABS 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.

Cap meter tiny.jpg

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. The original design was subsequently found to have a rising reading when idle, and also did NOT respond quick enough to catch the normal speech syllables so did not reach the true peak. 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 76.00 UK, 86.50 EU, 91.75 World, including tracking.

 

TWO TONE TESTER

A vital test unit for power output, envelope, and carrier suppression testing of AM, DSB, and SSB transmitters. Either 1600Hz or 1850Hz tones or both. Diecast box size 102x84x40mm.  

Box kit with all hardware 35.00 UK, 41.50 EU, 46.80 World, tracked.  Ready built 51.50 UK, 59.50 EU, 63.30 World, including tracked carriage.

TTO small.jpg

 

Morse inside small.jpg

 

MORSE OSCILLATOR

A stand alone Morse Practice Oscillator supplied either as a kit of parts to build the board shown in the picture as well as a drilled and labelled box, and all associated hardware, or ready built.  The boxed kit includes 1/4" jack socket for the Morse key, and 3.5mm jack socket for headphones, a SPST toggle switch, volume control, LED and holder, internal loudspeaker, PP3 battery holder and the necessary nuts and screws.  The kit even includes various coloured hookup wire and four stick on feet.  The battery shown in the pictures is NOT included.

PCB & Hardware kit 35.50 UK, 43.00 EU, 45.50 World.  Ready Built 53.00 UK, 61.00 EU, 64.80 World.

 

 

CRYSTAL CALIBRATOR

The Crystal Calibrator runs from a 10MHz crystal Colpitts oscillator followed by a wideband amplifier to feed four decade dividers.  The 10MHz and the outputs from the dividers are selected by the range switch are fed to an attenuator and output level control giving a range 0-1.2V p-p.  This in turn goes to the input of an emitter follower so a low impedance output is achieved on all ranges. The full output is enough to drive a short throw out wire that will radiate enough to be easily heard on a receiver in the radio room.  The level control can reduce this almost to zero except for any internal radiation getting to the output socket.   The circuit includes a low dropout regulator producing 6V DC from an internal PP3 battery (not included).

PCB & Hardware kit 60.50 UK, 66.00 EU, 71.30 World. Ready built 89.50 UK, 98.50 EU, 103.50 World.  Prices include tracked carriage.