---
title: "Model 865B-M | 100 kHz to 40 GHz (settable to 43.5 GHz) Wideband Low Noise Synthesizer"
date: 2025-01-06T02:42:47Z
modified: 2026-04-14T18:50:20Z
permalink: "https://www.berkeleynucleonics.com/model-865-m/"
type: page
status: publish
excerpt: ""
wpid: 19507
---
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#### Model 865B-M | 100 kHz to 40 GHz (settable to 43.5 GHz)Wideband Low Noise Synthesizer
The Model 865-M is a 100 kHz to 43.5 GHz compact frequency synthesizer with settable output power from -10 to +20 dBm, outstanding phase noise performance and signal purity, and ultra-fast switching speed. The 865-M is available with a modern touch display interface and in a 1U 19’’ rack-mountable (1URM) chassis, including single- or multi-channel configurations as the [865-M-40-X](/model-865-m-x).
The modules have an mHz frequency resolution and use a high-stability internal reference. The internal reference can be phase-locked to a programmable external reference. The modules have USB and LAN interfaces and can be controlled using SCPI 1999 command set. Operated with an external DC supply, they consume less typically than 20 W power.
###### MODEL 865B-M RF SYNTHESIZER CONFIGURATOR
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| **Options:** | \[-**LN**\] Enhanced Close-In Phase Noise \[-**FS**\] Fast Switching \[-**VREF**\] Variable External Reference Input from 1 MHz to 250 MHz \[-**1URM**\] 19″ 1U Rackmount Chassis \*_See also [865B-M-40-x](https://www.berkeleynucleonics.com/model-865-m-x)_ \[-**GPIB**\] GPIB Communication Port |  |
| --- | --- | --- |
| **Accessories:** | \[-**EB**\] External Battery Bank \[**P/N 7146**\] 19″ 2U Single/Dual Rackmount Kit \[**P/N 7145**\] Spare Power Supply \[**P/N 7143**\] | |