Comments on: BG7TBL RF noise source https://www.epanorama.net/blog/2017/08/29/bg7tbl-rf-noise-source/ All about electronics and circuit design Tue, 14 Apr 2026 12:29:58 +0000 hourly 1 http://wordpress.org/?v=3.9.14 By: Tomi Engdahl https://www.epanorama.net/blog/2017/08/29/bg7tbl-rf-noise-source/comment-page-1/#comment-1763589 Fri, 08 Apr 2022 12:12:56 +0000 http://www.epanorama.net/newepa/?p=58527#comment-1763589 Using A Vacuum Diode To Make The Cleanest Noise Source You’ve Ever Seen
https://hackaday.com/2022/04/01/using-a-vacuum-diode-to-make-the-cleanest-noise-source-youve-ever-seen/

Noise is an annoying but unavoidable part of any engineering project. Fixing noise issues is hard enough, but even just measuring how much noise an amplifier adds to your signal is tricky without proper equipment like a spectrum analyzer. One other thing that makes noise measurements easier is a good, stable noise source that can serve as a reference: you first measure your amplifier without any input, and then measure it again with the noise source connected. Using a few simple formulas you can then calculate how much noise the amplifier produced.

Building a source that generates exactly the amount of noise that you want, no more and no less, is quite a challenge in itself. Several techniques exist, but [Wolfgang] over at the Electronic Projects for Fun blog decided to go for the classic method of using a vacuum diode. He describes the design and analysis of a noise source based on a 2D3B tube in a detailed article.

https://electronicprojectsforfun.wordpress.com/making-noise/noise-sources-i-have-built/a-tube-noise-source-using-the-2d3b-tube/

]]> By: Dave https://www.epanorama.net/blog/2017/08/29/bg7tbl-rf-noise-source/comment-page-1/#comment-1750033 Tue, 04 Jan 2022 01:07:05 +0000 http://www.epanorama.net/newepa/?p=58527#comment-1750033 Where is the on/off switch? Certainly this VERY BASIC component was not forgotten, that would be just idiotic…

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2017/08/29/bg7tbl-rf-noise-source/comment-page-1/#comment-1682993 Sun, 21 Jun 2020 19:47:32 +0000 http://www.epanorama.net/newepa/?p=58527#comment-1682993 Review: Radiating comb generator provides quick harmonic measurements
https://www.edn.com/review-radiating-comb-generator-provides-quick-harmonic-measurements/

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2017/08/29/bg7tbl-rf-noise-source/comment-page-1/#comment-1682992 Sun, 21 Jun 2020 19:46:19 +0000 http://www.epanorama.net/newepa/?p=58527#comment-1682992 https://www.edn.com/diy-6-ghz-comb-generator/

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2017/08/29/bg7tbl-rf-noise-source/comment-page-1/#comment-1676730 Tue, 28 Apr 2020 16:54:40 +0000 http://www.epanorama.net/newepa/?p=58527#comment-1676730 https://www.edn.com/use-a-low-cost-noise-source-as-a-replacement-for-a-tracking-generator/?utm_content=bufferf0d21&utm_medium=social&utm_source=edn_facebook&utm_campaign=buffer

]]> By: Ajay Singh https://www.epanorama.net/blog/2017/08/29/bg7tbl-rf-noise-source/comment-page-1/#comment-1586145 Mon, 26 Mar 2018 11:26:09 +0000 http://www.epanorama.net/newepa/?p=58527#comment-1586145 To,
Manager Marketing

Sub: Quote the Dealer price for resale purpose along with technical details of NOISE GENERATOR SOURCE.

Dear Sir/Madam,
We take pleasure in introducing our company Arian Communications one of pioneers manufactures of EPABX and distributors of Security, CCTV cameras, computers peripherals and electronics components/products in Gujarat, India since 1985.

We are interested to resale NOISE GENERATOR SOURCE.

Details are attached herewith.a

Sr. No.

Description

Qty.

1.

NOISE GENERATOR SOURCE

Description attached separately

Please quote your most competitive Dealer price for resale purpose with technical details of above said items as early as possible.

Thanking you,

Ajay Singh
Business Development Officer
Arian Communication,
11, 3rd Floor, Agrawal Centre, Near Income Tax Circle, Ashram Road,
Ahmedabad-380 014, India
Email: info@arianindia.com, ajay@arianindia.com, Web: http://www.arianindia.com Cell : +91-94275 23669 /9898 348 706,Land line +91-79- 2754 2088

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2017/08/29/bg7tbl-rf-noise-source/comment-page-1/#comment-1566033 Sun, 08 Oct 2017 19:39:34 +0000 http://www.epanorama.net/newepa/?p=58527#comment-1566033 Review of a Working Chinese DC to 2 GHz Noise Source
https://www.youtube.com/watch?v=EV6TSCXh6Xo

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2017/08/29/bg7tbl-rf-noise-source/comment-page-1/#comment-1566032 Sun, 08 Oct 2017 19:37:40 +0000 http://www.epanorama.net/newepa/?p=58527#comment-1566032 Using the BG7TBL Noise Source to Characterize a HF Filter
https://www.youtube.com/watch?v=QMRxTSAjjLs

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2017/08/29/bg7tbl-rf-noise-source/comment-page-1/#comment-1566031 Sun, 08 Oct 2017 19:37:10 +0000 http://www.epanorama.net/newepa/?p=58527#comment-1566031 #178: Build, test, use the RF Noise Source on the Ham-It-Up RTL-SDR Upconverter
https://www.youtube.com/watch?v=HY1ijZbLfb8

]]> By: Tomi Engdahl https://www.epanorama.net/blog/2017/08/29/bg7tbl-rf-noise-source/comment-page-1/#comment-1561072 Thu, 31 Aug 2017 18:57:14 +0000 http://www.epanorama.net/newepa/?p=58527#comment-1561072 This tested was a new version of the popular BG7TBL noise source dated 2016-02-06. Prior to this the most recent version I had seen was 2014-08-20, and those often had a limited life span due to excessive heat. There are many of the usual Chinese vendors selling this new model, as well as many still selling the 2014 model.

versions
It seems that there are several versions, at least three. De oldest seems to be the 2013-12-18 version with two electrolytic capacitors. The 2014-08-20 design is even more complex and has six electrolytic capacitors. The 2016-03-06 is fully surface mounted and doesn’t have electrolytic capacitors. This is a good thing since electrolytic capacitors will age and surface mounted caps perform much better!

]]>