The Weinschel DS-109 Double Stub Tuner is a precision impedance matching instrument for RF and microwave systems. Two independently adjustable stubs manipulate transmission line impedance to minimize reflections and maximize power transfer. The device achieves VSWR of 7:1 down to 1.00 across its frequency range, making it essential for optimizing communication, radar, and RF-intensive applications where precise impedance control is critical.
Technical Specifications
Nominal Impedance: 50 Ω
Matching Range: Any impedance less than or greater than 50 Ω, achieving VSWR 7:1 to 1.00 within specified frequency range
Connectors: Type N Stainless Steel, one male and one female per unit
Frequency Range by Model:
• DS-109H: 40 MHz to 400 MHz
• DS-109LL: 0.2 GHz to 2.0 GHz
• DS-109L: 0.4 GHz to 4.0 GHz
• DS-109: 0.75 GHz to 12.4 GHz
• DS-109M: 0.75 GHz to 12.4 GHz
Stub Travel Length by Model:
• DS-109H: 53 cm
• DS-109LL: 76 cm
• DS-109L: 38 cm
• DS-109: 20.5 cm
• DS-109M: 20.5 cm
– Key Features
Stub Adjustment & Repeatability:
Collet-type locks secure stubs after adjustment. DS-109M variant includes coarse circumferential groove adjustment and micrometer-type fine-tuning control with ±0.005 inch repeatability.
DS-109H Design:
Helical conductor configuration in stubs and body section yields electrical length significantly greater than mechanical length, optimizing performance in the 40 MHz to 400 MHz band.
Build Standards:
Designed and tested to MIL-I-45208, MIL-Q-9858, and MIL-C-45662. Connector interfaces comply with MIL-PRF-39012, MIL-STD-348, and IEEE-STD-287. RoHS compliant.
– Typical Applications
Communication systems, radar systems, RF test and measurement, transmission line impedance optimization
– Compatibility & Integration
Type N connectors provide standard RF interface compatibility. Model selection depends on frequency band and required stub travel range.
