About Us

Company Profile

Guaranty Source Co., Ltd.

Guaranty Source Co., Ltd. (GSL) is a privately owned company with headquarters in Hong Kong. Our sales and marketing, logistics, engineering, and manufacturing facilities have locations in North America and Europe, and throughout Asia.

 With over twenty-six years serving global electronic markets, GSL is proud to be on the qualified vendor list of many prominent global companies.

Products and Services

GSL provides customer service, logistics and global design engineering specialization that allow us to offer custom design solutions across a wide range of RF components, modules, and systems required in microwave communications. We supply individual high performance reference oscillators, crystal filters, VCO’s, power amplifiers, and frequency synthesizer modules.  Furthermore, GSL can offer full turnkey designs and manufacturing solutions on a significant portion of a customer’s communications or system projects.

 GSL has established operations and QA testing centers in the USA and in Asia. The specialized testing capability allows our staff engineers to offer additional analysis of product behavior not easily available from large volume manufacturers. The ability to screen standard products for tighter performance allows us to offer more customized solutions with shorter lead-times.

Engineering Capabilities

GSL offers significant design, production, and quality engineering expertise which enables us to negotiate specifications and optimize manufacturing operations to consistently improve on quality and customer satisfaction. We emphasize meeting the design and volume production capabilities requested by our customers.

Featured Products

Latest NewsGuaranty Source Limited

  • Thanks for Visiting Us at IME2015 Shanghai

    DEI would like to thank all our booth visitors at IME2015 Shanghai. We look forward to working with you.

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  • DEI Now Exhibiting at IME2015 Shanghai 10/21 - 10/23

    DEI is currently exhibiting at IME2015 at the Shanghai Everbright Convention & Exhibition Center  from 10/21 - 1
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  • Ultra-stable DOCXO Boasts 4G LTE Holdover Performance

    Dynamic Engineers’ newest Double Oven Controlled Crystal Oscil
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  • DEI Now Offering Worldwide Standard TCXO for Rescue Beacon Devices

    Dynamic Engineers's latest Temperature Compensated Crystal Oscil
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  • IME2015 Microwave and Antenna Show (Shanghai) - 10/21 to 10/23

    Dynamic Engineers will be exhibiting at IME2015 Microwave and Antenna Show in Shanghai from 10/21-10/23. Come visit o
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  • New Product Announcement: Bank Filter Module

    Guaranty Source is pleased to announce the relea
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  • New Product Announcement: Ultra Low Noise, Vibration-Isolated OCXO5050L-100MHz-A-V

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  • New Product Announcement: Very Low Phase Jitter LVPECL VCXO

    Guaranty Source is pleased to announce the availability of a very LOW phase jitter VCXO family with LVPECL outputs. 
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  • New Product Announcement: GSTX1205-9.6MHz-X

    Guaranty Source Company Limited ( GSL ) is pleased to announce the global release of a high precision VCTCXO with six
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  • New Product Announcement: GSOX1207-10MHz-A

    Guaranty Source Company Limited ( GSL ) is pleased to announce the release of a new series of compact, low phase nois
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