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A complete active aerial that has design features you will not find even on expensive assembled varieties. RF gain control and two independent amplifiers. Dual-gate MOSFET with exceptional low noise and 2SC2570 microwave device for the best performance on VHF and above. Supplied with matching case & knob set
This kit once built allows you to monitor the entire aircraft band without tuning. This is done by using a passive design which means that it does not have any local oscillators, thus it can be used on aircraft without generating any interference to the pilot etc.. Its great for airshows, just listen to the air traffic, even to unknown frequencies. Multiple aircraft signals can be heard simultaneously with the strongest one the loudest which invariably will be the closest one to you. All without any tuning or looking up frequencies. The receiver is in a compact case complete with a belt clip. Just plug in the provided earbuds or your favourite pair of headhones into the receiver. A squelch control is also included to mute background noise and interference. Reviewed in 'Monitoring Times' November 2006 issue and 'Radio User' May 2007.
Tune into the exciting world of aviation. Listen to the airliners, business jets and private aircraft as they cross the skies above you. You’ll be able to hear aircraft up to 100 miles away at times. The AR-1 features smooth varactor tuning of the entire civil airband. Circuit is based on the superhet with AGC and squelch included.
Supplied with matching case & knob kit.
This kit makes is a great project for novices or experienced contructors alike. It can be used with any of the modern solid state transceivers. Speeds are adjustable from 5 to 50 WPM from the front panel with an internal coarse speed control. All you need is to add a paddle key. The unit will happily drive a small speaker and a stereo socket is provided for the paddle.
Rejuvenate and condition your Ni-Cads. Unique discharge before charge circuitry eliminates ‘memory effect’. Quick charge switches to ‘top-off’ automatically at optimum point in charge cycle. Switch-mode regulator controls constant current charge while being monitored by a negative delta-V system that cuts off the fast charge at the exact point of full charge.
Three sensor EGC monitor kit. Safe to use runs on 9V DC. Output available for oscillosope showing traditional style ECG/EKG waveforms.
Note: This is not a medical device, it is intended for hobbyist usage only!
The FR-1 is ideal for the novice. It builds into a high performance FM broadcast receiver that is ideal for bedside or study use. Supplied with matching case & knob set
This radio covers the 10m amateur band but can easily be extended to cover the CB band. Features double conversion with ceramic IF filter, squelch and AFC for stability. Features latest Motorola chip.
This radio covers the 2m amateur band but can easily be extended to cover the marine band. Features double conversion with ceramic IF filter, squelch and AFC for stability. Features latest Motorola chip.
Kit contains matching case & knob set.
This radio covers part of the 6m amateur band. Features double conversion with ceramic IF filter, squelch and AFC for stability. Features latest Motorola chip.
The transmitter produces 4 to 6W and is ideal for repeaters, remote base, packet and fox hunts etc. It has good low-pass filtering and as usual the manual is very comprehensive and all components, circuit board and heatsink are included. The only test equipment needed is a simple multi-meter. Tuning tool is included in the kit.
These single band radios use direct conversion with varicap tuning and have amazing sensitivity. They offer reception of SSB, CW and AM and are ideal as part of a QRP station. Supplied with matching case & knob set.
These single band radios use direct conversion with varicap tuning and have amazing sensitivity. They offer reception of SSB, CW and AM and are ideal as part of a QRP station. Kit contains matching case & knob set.
The LB-56C is ideal for secure communications using infrared. It easily transmits through windows and the 10m range can be extended by using a simple lens. The transmitter can use any type of microphone, and the receiver will drive any loudspeaker or earphone. Supplied with matching case & knob set.
This will save you hours taken up in testing for unknown values. Handles ranges from 2pf to 2µf and 1µH to 10mH. Can be used with any multimeter. Calibration components included. Just put the unknown component across the terminals, switch to the appropriate range on the LC-1 and read the value on your test meter.
* Supply: 12V DC @ 2 - 4A * Case & knob set (C-QAMP): Supplid
This mono band amplifier for 20m is ultra linear and suitable for SSB/AM or CW. and uses power MOSFETS for 20W output. Ideal for increasing QRP transmitter power or incorporating into home-built projects.
* Supply: 12V DC @ 2 - 4A * Case & knob set (C-QAMP): Supplied
This mono band amplifier for 30m is ultra linear and suitable for SSB/AM or CW. and uses power MOSFETS for 20W output. Ideal for increasing QRP transmitter power or incorporating into home-built projects.
This mono band amplifier for 40m is ultra linear and suitable for SSB/AM or CW. and uses power MOSFETS for 20W output. Ideal for increasing QRP transmitter power or incorporating into home-built projects.
Low power operation on the ham bands is great fun and these kits offer a complete variable xtal controlled transmitter delivering 1W output. VXO provides 7kHz shift and there’s even a diode T-R switch included! Xtal is centred on 14.060MHz.
Low power operation on the ham bands is great fun and these kits offer a complete variable xtal controlled transmitter delivering 1W output. VXO provides 7kHz shift and there’s even a diode T-R switch included! Xtal is centred on 7.040MHz.
Low power operation on the ham bands is great fun and these kits offer a complete variable xtal controlled transmitter delivering 1W output. VXO provides 7kHz shift and there’s even a diode T-R switch included! Xtal is centred on 3.579MHz.
This handy little device will let you check low level RF voltages using any digital voltage multimeter (DVM). Ideal for signal tracing and low level fault finding in transceivers etc. Frequency range is flat from 100kHz to 1GHz. Uses microwave ‘lo-barrier’ detector diodes that let you detect microwave levels! 1mW input produces 100mV DC output to meter. Comes completely assembled with hook test probe and banana plugs for multimeter.
The SA-7 broadband RF preamplifier is great for perking up old frequency counters, scanners, TVs and old short-wave receivers. Its 2-stage feedback design ensures stable operation throughout the spectrum.
The SM-100 Signal Magnetic Noise Reduction Antenna pulls weak signal out of the noise. The antenna responds only to the magnetic field of the desired station and ignores the electrostatic field where most interference is found. Designed expressly for the AM medium wave band, but can be built for any frequency range from 500kHz to 15MHz. Optional Case no longer available).
Formerly SOFT-NC7)
Supplied with with matching case & knob set.
The SR-2C is an ideal shortwave receiver kit for beginners. Extremely sensitive front end with AGC and RF gain control. Varactor diode tuning allows you to tune any 2MHz portion of the 4 to 11MHz frequency range. Requires an external antenna, speaker and 9V battery.
This kit is designed to invert the audio speech pattern so that it is rendered unintelligible to the casual listener. It also contains the circuitry to descramble incoming inverted speech. It achieves this by using SSB techniques at audio frequencies. The unit may be used with AM, SSB or FM transceivers. Two units together can provide a complete scrambled system. There is sufficient audio output to drive a small speaker.
Note: Cannot be legally used in the UK.
The TG-2 will decode and store any DTMF tone it hears. A simple hook-up to any radio speaker or phone line is all that is required, and it will decode digits at virtually any speed!
The bright 8-digit LED display lets you scroll through the stored numbers at your leisure. To make it easy to pick out numbers or codes, a dash is inserted between any group or set of numbers that were decoded more than 3 seconds apart. Added features from its TG1 predecessor include an onboard RJ11 phone jack for easier phone line interfacing and an output latch jack offering an external trigger source when a user specified number (1 to 60 digits!) matches the monitored input! The TG2 runs on any 8 to 15 volt DC power source and is both regulated and crystal controlled for the ultimate in stability. Includes the matching professional case set shown, measuring 5”W x 1½”H x 5¼”D.
The TS-1 Touch Switch uses low power CMOS circuitry and functions on the principle of hum and noise pick-up when the input is touched. There are two independant Touch circuits. To activate touch the input and the electronic switch will operate. To switch it off, touch the input again. Or use it so that it operates only as long as it is touched. The touch contact may be a door knob, small coin, or small piece of veroboard. The TS-1 will drive loads up to 100mA such as relay, bell or siren etc. For switching greater loads an external relay is recommended. It can also be configured to operate as a Morse code keyer, information included in the instructions.
The TT-7 decodes any single DTMF digit 0 through to 9, *, #, plus A,B,C,D. The unit can be connected directly across a speaker or detector output on any receiver. When the decoder detects the selected digit, it provides a closure to ground, ideal for driving a relay, lamp, sounder or any other such load up to 20mA.
This great little kit allows you to send any audio and video source (i.e. VCR or TV camera) to any TV set up to up to 300ft. Tunable to American TV channel 2 - 6. Includes case. (Will not work on UK TV channels).
Export Only. Not legal in the UK
