--- title: "Model 845-M-X | 10 MHz to 20 GHz Wideband Low Noise Microwave / RF Synthesizer [Obsolete]" date: 2025-01-06T02:16:01Z modified: 2026-03-24T15:37:10Z permalink: "https://www.berkeleynucleonics.com/model-845-m-x/" type: page status: publish excerpt: "" wpid: 19498 --- [ ![](https://www.berkeleynucleonics.com/wp-content/uploads/bnc_academy_upper_banner.png) ](https://academy.berkeleynucleonics.com/) [](https://www.berkeleynucleonics.com/wp-content/uploads/images/products/845-r-m_360-1_0.png) ![845-r-M-360](https://www.berkeleynucleonics.com/wp-content/uploads/images/products/845-r-m_360-1_0.png) [](https://www.berkeleynucleonics.com/wp-content/uploads/images/products/845-r-m_360-7.png) ![845-r-M-360](https://www.berkeleynucleonics.com/wp-content/uploads/images/products/845-r-m_360-7.png) [](https://www.berkeleynucleonics.com/wp-content/uploads/images/products/845-r-m_360-13.png) ![845-r-M-360](https://www.berkeleynucleonics.com/wp-content/uploads/images/products/845-r-m_360-13.png) [](https://www.berkeleynucleonics.com/wp-content/uploads/images/products/845-r-m_360-19.png) ![845-r-M-360](https://www.berkeleynucleonics.com/wp-content/uploads/images/products/845-r-m_360-19.png) - [ Quote ](/get-quote/?interested_product=Model%20845-M-X%20|%2010%20MHz%20to%2020%20GHz) - [ Contact ](/contact-us/) - [ Datasheet ](#technical-resources-section) - [ Price List ](/access-pricelist/) - [ LabVIEW ](/bnc-labview-driver-list/) #### Model 845-M-X | 10 MHz to 20 GHzWideband Low Noise Microwave / RF Synthesizer \[Obsolete\] The Model 845-M-X is a one or two-channel wideband low phase-noise synthesizer operating up to 20 GHz. The module has a sub-Hertz (1 mHz) frequency resolution and uses a high-stability internal reference. The internal reference can be phase-locked to a programmable external reference. The module has a standard USB and LAN interfaces and an optional GPIB interface and can be controlled using the SCPI 1999 command set. _Please contact for alternative solutions or recommended replacement models._ ##### [Features](#features-section) ##### [Specifications](#specifications-section) ##### [Options](#options) ##### [Tech Resources](#technical-resources-section) ##### [Media](#media-section) ##### [Downloable Resources](#downloadable-section) ##### [Price List](#pricelist-section) #### Overview ##### Features - Low Phase Noise - Fast Switching down to 20 µs - FM, Chirps, Pulse - Internal OCXO, External variable reference ##### Applications - Automated Testing Environment (ATE) - Local Oscillator (LO) for frequency converters - Telecom / SatCom #### Specifications **Number of Channels** 1, 2 **Frequency** **Range:** 0.01 to 20 GHz **Resolution:** 0.001 Hz **Accuracy:** 0.1 ppm **Output Power** +23 dBm **Switching Speed** 150 µs (30 µs with option FS) **Phase Noise At 1 GHz** **at 1 kHz:** -118 dBc/Hz **at 20 kHz**-128 dBc/Hz **at 10 MHz:** -150 dBc/Hz **Remote Control (SCPI 1999)** Ethernet, USB (optional GPIB) **Sweeps** List, Frequency **Dimensions (W x L x H)** **Weight** 16.93 x 18.11 x 1.69 in **\[**430 x 460 x 43 mm\] 17 lbs (8 kg) **Shipping Dimensions** 23x23x19″ **Shipping Weight** 19 lbs #### Options ###### Model Summary FS Ultra-Fast Switching Speed **GPIB** GPIB interface #### Technical Resources [ App Note - Mixer Measurements](https://www.berkeleynucleonics.com/download/21246/?tmstv=1778700938) [ App Note - How to Program Sweeps in Signal Generators](https://www.berkeleynucleonics.com/download/21249/?tmstv=1778700938) [ BNC Model 845-M-X Multi-channel Frequency Synthesizer Datasheet](https://www.berkeleynucleonics.com/download/26209/?tmstv=1778700938) #### Downloadable Resources Downloadable resources such as datasheets, firmware, software, drivers and products manuals. Alternatively, you can browse resources directly by visiting our [downloads page](/downloads). - [Product Datasheets](/downloads#rf-datasheets) - [Product Firmware](/downloads#rf-firmware) - [Product Software and Drivers](/downloads#rf-softwaredrivers) - [Product Manuals](/downloads#rf-manuals) #### Media ## Playlist ![Ultimate Guide! The Perfect RF & Microwave Signal Generator](https://img.youtube.com/vi/XIq4aKUcbDQ/maxresdefault.jpg) #### Ultimate Guide! The Perfect RF & Microwave Signal Generator 47:26 #### Price Lists [ Berkeley Nucleonics Price List 2026](https://www.berkeleynucleonics.com/download/19881/?tmstv=1778700938) [ ![](data:image/svg+xml;charset=utf-8,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' viewBox%3D'0 0 1105 100'%2F%3E) ](https://academy.berkeleynucleonics.com/)