Quality English products hand-crafted to order
News & New Products - 15 December 2021
Proprietor;- Mr A.J. Nailer HNC BA G4CFY.
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@spectrumcomms.co.uk 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, quotes & technical requests to g4cfy@talktalk.net
NEWS & PRODUCT UPDATE 15 December 2021
Jean Nailer, my wife for 51 years and business partner in spectrum for 40 years passed away from a brain haemorrhage on 29 november 2021
There is lots to do and unfortunately these web pages are a long way down the list.
A number of products listed below have now been removed because they weren't selling.
The Spectrum website has undergone a long overdue revamp. The Listener page has been amalgamated into the Receive & Transmit Boxed Products and Receive & Transmit PCB Products pages. Some products that haven't sold for ages have been removed and no doubt you won't even notice. Other products that have been on my Ebay shop site for much of the year are now included in the appropriate pages. At the bottom of the page are details about Understanding Radio Book 1 & Book 2. To assist the searcher the content of each of the other Spectrum pages now include the contents.
Coax cables | Balun 1-42MHz Air cored (RX & TX) | Active Wire Aerial (RX) |
95 Ohm Twin Feeder | Slim-G VHF (RX & TX) | Nomad VHF/UHF (RX) |
G4CFY Traps | Flexi-whips VHF/UHF (RX & TX) | Active Nomad VHF/UHF (RX) |
G4CFY HF Trap dipoles (RX& TX) | Mobile Whip Aerials VHF/UHF (RX/TX) | Compact Coil HF Active Aerial (RX) |
Inverted-L HF (RX & TX ) | G4CFY Aerial Development History | Long Wire HF portable aerial (RX) |
Piptone, Kaytone | Frequency mod-demod, FM455 | VCO48 block for Cybernet 048 |
Spectra bleedover filter, SF10.7 | Speech Processor, SP059 | EU and UK add-ons for FM rigs |
Noise Squelch | VCO27 block for Cybernet 059 & 121 | UK add-on for multimode rigs |
PTFE Feedthroughs | Ferrite Binocular core | Field Effect Transistors, junction type |
Polyvaricon Tuning Capacitors | Ceramic 2 pole 5 way Switch | Dual Gate Mosfets, 40673, 3N201, etc |
Spectrum 10mm Coil (TOKO replacements) | Power Relay | IF Filters, crystal, ceramic, & ladder |
Capacitors, fixed and trimcap | Resistors, fixed and trimpot | Crystals, new & S/H, HC18U, HC49U, etc |
Dust Iron Toroidal Cores | Diodes, signal, varicap, zener, rectifier | Integrated Circuit, Op Amps, & RF/IF, etc |
Ferrite Toroidal Cores | Transistors, small signal, AF, IF, RF power | Valves, B7G, B9A, & Octal |
RX L-TYPE ATU | VHF Masthead Preamps RF Switched |
RX SPC ATU | 100kHz to 4MHz Receive Converter |
QRP TX SPC ATU | VLF/LF to 4MHz Receive converter |
HF Tuneable Preamp 1.8-30MHz | VHF Receive converters 2m, 4m, & 6m |
HF Switched Preamp 1.8-30MHz | Clara 2 Receiver |
VHF Receive Preamp | Transverters 2m, 4m, & 6m |
110-400MHz Scanner Preamp | VHF Transmit Amplifiers, 25/50/100W |
VHF Station Preamps RF Switched | 4001 FM 4m Transceiver |
Intermediate Licence VFO | RX Mixer & Dual Front-end BP Filters | Regen Receiver, single band |
Intermediate Licence Crystal Oscillator | SSB IF Filter 6-Pole, 9 or 10.7MHz | Regen Receiver, four band |
Portland VFO v2 | RX 9MHz IF Amplifier with AGC | Super Sudden by G3TEX & G4CFY |
5 Band 100W TX Low Pass Filter | SSB Detector & CIO 9 or 10.7MHz | Piptone PT1000S |
5W Broadband HF Linear | SSB Detector & CIO 455kHz | Kaytone KT2000 |
RX Front-end Filters, 5 & 10 band | Audio 500mW Amplifier | CTCSS Encoder |
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 |
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Understanding Radio Book 1 is a re-write of the Technical for the Terrified Book 1 published by Practical Wireless and compiled from 27 articles of that name previously published in PW Magazine between February 2005 and October 2008. The first chapter is a short revision for everyone who has not used algebra since leaving secondary or grammar school. It should also be useful to youngsters still at school and trying to get to grips with it. The articles have been reworked into chapters so there is now a natural progression of information through the book. All the circuits have been redone and a lot of wasted space and unnecessary comments removed. It runs to 112 pages, which is 10 less than the T4T Book 1 but there is a lot more in it. The writing style is aimed to be easy to read and should be of great value to readers of all technical levels. Subjects include; Algebra; Resistors & Ohm's Law; Diodes and Rectification; Transistors - FETs & Valves; Transistor biasing; Amplifier Classes of Operation; Reactance & Resonance; Parallel Tuned Circuits; Bandpass Coupled Pairs; Small Signal Bipolar RF/IF Amplifiers; Small signal FET & Mosfet RF/IF Amplifiers; Oscillators; Mixers; Decibels; Modulation Modes; TRF & Superhet; Filtering in HF & VHF Receivers; Modes & Demodulation; Choosing RF - IF & LO; Phase Locked Loop; PLL in CB & 10M rigs; Antennas & Feeders.
Understanding Radio Book 2 first print run was early June. It is a re-write of Technical for the Terrified Book 2 including all the articles 28-49 published in PW between October 2008 and April 2013 plus article 51 published in August 2013. The articles have been condensed into chapters and unnecessary duplication of information has been trimmed back and then the subjects further expanded. It runs to 114 pages and the subjects include Passive components, old and new; Equivalent circuits; Variable Frequency Oscillators; Crystal Controlled Oscillators; Feedback & Amplifier Stability; Singly Balanced Mixers; Analogue Low Pass Filters; Laying out Printed Circuit Boards; Measurements and Test Jigs; Receiving 100kHz - 30Mhz; Superhet Receivers; AGC of RF & IF Stages; Superhet with Tuneable IF; Coax & Twin Feeder; SWR/PWR Meters & the Noise Bridge; Aerial Impedance - Bandwidth & Gain; Aerials for Receive & Transmit; ATU's for Receive & Transmit. To buy either book on its own including postage pay £15.50 to my personal Paypal account antony.nailer@talktalk.net or through Spectrum, or by direct transfer to my bank. To buy both books together pay £29.00 to my personal Paypal account antony.nailer@talktalk.net or through spectrum, or direct transfer to my bank. |
Spectrum Communications was established as a part-time business by Tony Nailer G4CFY in October 1978. In August 1981 following the legalization of CB in the UK there was sufficient work and CB sales for both Tony & wife Jean for full time employment. CB popularity declined steadily to a very low level by about 2000 and for the following 4 years sales were almost at unsustainable levels. Following becoming an author with PW in 2004 and developing new projects for the Doing It By Design series, sales have risen back to make us busier than ever. I became author of another PW series In 2005 titled Technical For The Terrified. I ceased being an author in 2017 following the change of ownership of PW.
G2DYM Aerials was purchased from Richard Benham-Holman G2DYM on 30 October 2006.
Garex Electronics was purchased from Peter Longhurst G3ZVI on 1 December 2011.