Engineering background on the technologies we supply — direction finding, receivers, signal generators, recording & playback, antennas, SSPA & TWT amplifiers, switch matrices and filters.
Plain-language answers across the technologies we represent.
Direction finding determines the bearing (angle of arrival) of a radio emitter. Systems use antenna arrays and multi-channel receivers with techniques such as amplitude comparison, phase interferometry, Watson-Watt or correlative interferometry to estimate the emitter's direction.
Antenna array geometry and aperture, channel-to-channel phase/amplitude match, receiver dynamic range and bandwidth, calibration, multipath and signal-to-noise ratio. Wider apertures and well-calibrated coherent multi-channel receivers improve bearing accuracy.
DF gives a line of bearing from one site. Combining bearings from multiple sites (triangulation), or using TDOA/FDOA across sensors, yields a geolocation (a position fix) for the emitter.
A software-defined receiver digitizes a wide RF band and performs filtering, down-conversion and demodulation in the digital domain (FPGA/DSP). This gives flexible bandwidths, fast tuning, multi-channel coherence and re-programmable processing for monitoring, SIGINT and DF.
Instantaneous bandwidth (IBW) is the contiguous spectrum a receiver can capture and process at once. Wider IBW lets you detect short, agile or frequency-hopping signals without sweeping, which is critical for spectrum monitoring and EW.
Frequency range, instantaneous bandwidth, noise figure/sensitivity, spurious-free dynamic range (SFDR), phase noise, image rejection, tuning speed, and the number of coherent channels.
It produces controlled RF signals — CW tones, modulated waveforms, or complex scenarios such as GNSS constellations, radar or communication emitters — used to test, calibrate and stress receivers, DF systems and the full signal chain.
A GNSS simulator generates realistic satellite signals so receivers can be tested repeatably in the lab — including multipath, interference, jamming and spoofing scenarios — without relying on live sky signals.
Record and playback systems capture live RF (typically wideband IQ data) to storage, then replay it later through the same chain. This lets engineers reproduce real-world environments in the lab for test, analysis and algorithm development.
Instantaneous bandwidth and channel count set the data rate; storage capacity and sustained write speed set the duration. Wideband, multi-channel diversity capture needs high-throughput storage with precise (often GPS-disciplined) timing.
Gain expresses how much an antenna concentrates energy in a direction (dBi); beamwidth is the angular width of the main lobe. Higher gain generally means a narrower beam — parabolic and horn antennas offer high gain, log-periodic and discone offer broad bandwidth with lower gain.
Horn and parabolic suit high-gain, directional links and measurement; log-periodic gives constant performance over very wide bands; discone/omni gives all-azimuth coverage for monitoring; Luneberg-lens and reflector types serve radar cross-section and multi-beam applications.
Voltage Standing Wave Ratio measures the impedance match between antenna and system. High VSWR means more reflected power, lower efficiency and possible transmitter damage. Good antennas keep VSWR low across their band.
A Solid-State Power Amplifier (SSPA) uses transistor technology (GaN/GaAs/LDMOS) — compact, rugged, long MTBF, graceful degradation. A Traveling-Wave Tube (TWT) amplifier uses a vacuum tube — offering very high power and very wide bandwidth at higher frequencies, favored for high-power radar, EW and SATCOM uplinks.
Frequency band, saturated output power (P1dB/Psat), gain, linearity (IP3, ACPR), efficiency, harmonics/spurious and cooling method (air or liquid). Linear and ultra-linear PAs trade efficiency for low distortion in communications.
CW amplifiers run continuously (communications, jamming, scientific); pulsed amplifiers deliver high peak power in short bursts (radar). Duty cycle, peak vs average power and thermal design differ significantly.
A switch matrix routes any of several RF inputs to any of several outputs under electronic control — used to share receivers/antennas, build automated test setups and route signals in monitoring and SIGINT systems. Key specs: isolation, insertion loss, switching speed and port count.
PIN-diode switches offer very fast switching (nanoseconds to microseconds), high reliability with no moving parts, good power handling and wide bandwidth — ideal for high-speed routing, blanking and matrix applications where mechanical/relay switches are too slow.
PIN-diode: very fast, long life, lower power handling, some insertion loss. Electromechanical: very low insertion loss and high isolation, higher power handling, but slow with limited switching lifetime. The choice depends on speed, power and cycle count.
A pan & tilt positioner, or pedestal, is a motorized two-axis platform that points and tracks a payload — an antenna, radar, camera, jammer or weapon — in azimuth (pan) and elevation (tilt), combining servo motors, gearing, encoders and a controller to move the load precisely and hold it on target.
Payload capacity (mass and moment), pointing accuracy and repeatability, azimuth/elevation travel and speed, acceleration, backlash, wind loading, ingress protection (e.g. IP65) and operating temperature. Higher-accuracy units reach around ±0.01° with continuous 360° azimuth.
Pointing accuracy is how close the positioner gets to the commanded absolute angle; repeatability is how consistently it returns to the same position on repeated moves. Encoders, stiff gearing and low backlash improve both — repeatability is usually better than absolute accuracy.
Common modes include position (go-to a commanded angle), scan/search (sweep a sector), manual jog, step-track and auto-track (closed-loop tracking on a received signal or sensor), and slave/auto-alignment to another sensor.
Consider payload mass and centre of gravity, aerodynamic profile, required slew speed and accuracy, environmental conditions and duty cycle, then select the right model — from a few kilograms to several hundred kilograms — or commission a custom build.
Low-pass, high-pass, band-pass and band-reject (notch) filters, plus duplexers and diplexers. Implementations include cavity, lumped-element (LC), microstrip, waveguide and ceramic — selected by frequency, bandwidth, power and selectivity needs.
Center/cutoff frequency, bandwidth, passband insertion loss, stop-band rejection, return loss/VSWR, group delay, power handling and selectivity (skirt steepness). High-Q cavity filters give sharp selectivity and low loss.
Filters reject out-of-band interference and images, protect sensitive front-ends and limiters from strong adjacent signals, and define channel selectivity — improving dynamic range and preventing desensitization in dense RF environments.
MIL-STD-810 defines environmental engineering tests that verify equipment survives real-world conditions — temperature extremes, thermal shock, humidity, vibration, mechanical shock, altitude, salt fog, sand and dust, and rain. For RF hardware (amplifiers, receivers, positioners, antennas) it proves the unit keeps performing in field, vehicle, shipboard or airborne use. A part is qualified to specific methods matched to its platform life-cycle profile.
MIL-STD-461 specifies the electromagnetic interference (EMI) requirements and EMC test methods — conducted and radiated emissions (CE/RE) and conducted and radiated susceptibility (CS/RS), e.g. RE102 and RS103. RF equipment must meet these so it neither disrupts nor is disrupted by other systems on the platform, which is why EMI shielding, gasketing and filtering are critical.
MIL-STD-810 covers physical/environmental robustness (heat, vibration, shock, water, dust); MIL-STD-461 covers electromagnetic compatibility (emissions and immunity). A rugged defense RF product is typically qualified to selected methods of both.
An Ingress Protection rating has two digits: the first is protection against solids/dust (0–6, where 6 = fully dust-tight); the second against water — 5 = water jets, 6 = powerful jets, 7 = temporary immersion (to ~1 m, ~30 min), 8 = continuous immersion beyond 1 m. So IP65 is dust-tight and jet-proof, IP66 withstands powerful jets, IP67 survives temporary submersion, and IP68 handles prolonged submersion.
It depends on exposure. IP65/IP66 suits most outdoor masts, enclosures, antennas and positioners exposed to rain and wash-down; IP67/IP68 is for equipment that may be submerged or used in severe marine/flooding conditions.
They are complementary: IP addresses dust and water ingress, MIL-STD-810 covers the broader environmental stress set (temperature, vibration, shock, salt fog, altitude), and MIL-STD-461 covers EMI/EMC. A field-grade RF unit is commonly specified as, for example, IP67 plus selected MIL-STD-810 methods plus MIL-STD-461 compliance.
Tell us your requirement — frequency, power, platform — and our team will match the right manufacturer and component, with a quote and product support.
