---
title: "Model 865B-M-40-X | 100 kHz to 40 GHz Multi-Channel Low Noise Wideband Synthesizer"
date: 2025-01-06T02:58:02Z
modified: 2026-04-24T15:42:46Z
permalink: "https://www.berkeleynucleonics.com/model-865-m-x/"
type: page
status: publish
excerpt: ""
wpid: 19517
---
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#### Model 865B-M-40-X | 100 kHz to 40 GHzMulti-Channel Low Noise Wideband Synthesizer
The Model 865B-M-40-X is a multi-channel wideband low phase-noise synthesizer settable from 100 kHz to 43.5 GHz. The unit is available with 2, or 4 fully independently configurable outputs. For each channel, frequency, power, phase, and modulation can be set. The settable output power range of the 865B-M-40-X is from -5 to +25 dBm.
Model 865B-M-40-X comes with an intuitive Graphical User Interface and also compatible with C++, Python, Java, and other programming languages.
###### MODEL 865B-M-40-x SIGNAL SOURCE CONFIGURATOR
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display: inline !important;
appearance: checkbox !important;
width:auto !important;
}
.tables-no-border-and-back, .tables-no-border-and-back td, .tables-no-border-and-back tr {
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| **Number of Channels:** | **1 Channel in 1U Rackmount 2 Channels in 1U Rackmount 3 Channels in 1U Rackmount 4 Channels in 1U Rackmount** | **
** |
| --- | --- | --- |
| **Options:** | **\[-**8k**\] Frequency Range Extension down to 8kHz \[-**HI**\] High Channel-to-Channel Isolation Chassis** \[**\***Promotion\] **\[-LN\] Enhance Close-in Phase Noise** **\[-FS\] Fast Switching (per channel)** **\[-FLASH\] Removable MicroSD card slot** **\[-FILT\] Harmonic Filtering** **\[-VREF\] Variable External Reference Input from 1 MHz to 250MHz** **\[-GPIB\] GPIB Communication Port** | |
| **Model 865B-M-40-1-HI** 1 Channel, 100kHz – 40GHz Microwave/RF Signal Source | | |
| **INQUIRE** | | |
##### [Features](#features-section)
##### [Specifications](#specifications-section)
##### [Tech Resources](#technical-resources-section)
##### [Media](#media-section)
##### [Downloable Resources](#downloadable-section)
##### [Price List](#pricelist-section)
#### Overview
##### Features
- Fast switching down to 20 µs
- FM, PM, Pulse
- Internal OCXO, External variable clock reference
##### Applications
- Automated Test Environment
- LO for frequency converters
- Telecom / SatCom
- Quantum Computers
#### Specifications
**Channels**
1, 2, 3, or 4
**Frequency**
**Range:** 100 kHz to 40 GHz (settable to 43.5 GHz)
**Resolution:** 0.001 Hz
**Accuracy:** 0.1 ppm
**Output Power**
-10 to +25 dBm
**Switching Speed (Sweep Mode)**
500µs (20µs with option FS)
**Phase Noise At 1 GHz**
**at 1 kHz:** -132 dBc/Hz
**at 20 kHz**-145 dBc/Hz
**at 10 MHz:** -155 dBc/Hc
**Remote Control** (SCPI v1999)
Ethernet, USB, GPIB (optional)
**Modulation**
Pulse
**Sweeps**
List, Frequency
**Dimensions (W x L x H)**
**Weight**
16.93 x 18.11 x 1.69in \[430 x 460 x 43 mm\]
22 lbs \[10 kg\]
**Shipping Dimensions**
23 x 23 x 9 in
**Shipping Weight**
24 lbs \[11 kg\]
#### 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)
[ App Note - Pulse Descriptor Word for VSG](https://www.berkeleynucleonics.com/download/21230/?tmstv=1778700938)
[ BNC Model 865B-M-40-X Multi-channel Frequency Synthesizer Datasheet](https://www.berkeleynucleonics.com/download/26288/?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
#### Tools for Quantum Computing Applications
40:11
#### Our Latest Quantum Computing Course! | BNC Academy
0:40
#### 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)
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