Ground-Penetrating Radar: PQ622, PQ625 & PQ626

PQ622A uses a 600 MHz antenna; PQ622B uses 900 MHz. These higher-frequency options support shallow structural investigations where detail matters, such as pavement layers, lining thickness and suspected voids. Higher frequency normally improves detail at the expense of penetration.

Define the smallest target and expected layer thickness. Reinforcement, antenna coupling and surface access can limit interpretation. A radar profile needs calibrated velocity or dielectric assumptions before travel time is reported as depth.

PQ625 is a configurable family rather than one universal frequency. The supplied selection guide discusses single-frequency 100 / 200 MHz equipment; the manufacturer also lists dual-frequency PQ625A+ (100 + 400 MHz), B+ (200 + 400 MHz), C+ (200 + 600 MHz) and D+ (400 + 900 MHz). Confirm the complete suffix and antenna set before ordering.

For buried utilities or mixed-depth work, provide pipe material and diameter, expected burial depth, ground conditions and required survey coverage. A detectable reflection depends on contrast with the surrounding material; radar does not identify every buried object.

The supplied PQ626 manual lists PQ626C at 50 MHz and PQ626D at 100 MHz with unshielded antennas. These lower-frequency configurations can be considered for larger targets and deeper geological investigation where the site permits useful penetration.

Lower frequency does not guarantee a fixed depth. Conductive clay, saline ground, moisture and interference may strongly attenuate the signal. Allow adequate survey space and confirm the acquisition method: the supplied unshielded configuration does not include a distance wheel.

Send the country, target type, approximate target size and depth, ground or concrete conditions, survey area and desired output. Photos, existing plans and a sample profile help assess whether a demonstration or trial line is appropriate.

Ask the quotation to identify the exact antenna frequency, accessories, compatible Windows computer, software, training, warranty terms and delivery destination. Save raw data, survey-line positions and calibration assumptions so another operator can review the interpretation.