Hello, New on this forum dedicated to analyzers, I saw this article on an analyzer that seems "easy" to build with commercial components. https://github.com/exDB2O/tinySA/blob/master/Build%20instructi

hello, As I always have a little time, I look at the possible DIY of a differential probe. Will it ever serve? Pleasur to do lol In short, as on the active probe we use a fet BF998. As it is sold at t

Hello, Having some time I drew this probe. Length 3.5 cms. Your opinions It's inspired of Elektor cdt

Hi, Trying to get a JFet oscillator to work. I'm using Ashar Farhans schematic for his spectrum analyzer. (100 mhz 2nd Oscillator) So far I've built two boards and burned out Q1 in each board even tho

Hello, Does anyone have the DL1640 manual service? If he has the schematic, it’s even better! I’m struggling with a repair. I have a post on Eevblog forum Oscilloscope YOKOGAWA LD1640 - Page 1 (eevblo

Recently, I saw the open source design of SimpleSA, and I thought it was great.Thank you very much for such an excellent design, which benefits most people. I wanted to make one at home, but after loo

What does Reference Generator Out do？

I registered a group a few years ago, but never used it. Today I decided to turn it into a group for the design and construction of test equipment. https://groups.io/g/Test-Equipment-Design-Constructi

I would like some way of measuring the Q of inductors up to at least 30 MHz - 150 MHz would be nice. I have an HP 4284A Précision LCR meter (20 Hz to 1 MHz 0.05% basic accuracy) and a 4285A (75 kHz to

I've recently acquired a Tek 284 that seems to need some TLC. Before I start snooping around in it, I'm wondering if there are any "usual suspects" that I should consider. Besides all the electrolytic

This is a double post I also made on the tinySA group. It was intended to be posted here but groups.io switched to the wrong group for some reason. Anyway Has anyone of you had a look at this chip fro

Hi group members I have about 15 years as an EE developer, mostly conumer stuff. My main interest for test equipment is for debugging rf-emissions and pre-compliance testing and not amateur radio. If

Hi, I am starting to build a 'specan' (https://hfsignals.blogspot.com/p/specan-reboot-of-w7zoi.html ) Mainly because I have a prototyping shield spare I will be using one. It also has an SOIC 14 footp

Does anyone have a recommended source for 9MHz crystals for a crystal ladder filter? Plenty offered on E-bay but no way of telling how good they are. Thanks, Mike K5ESS

I'm trying to run Erik Kaashoeks code for the 10 MHz reference. The problem seems to be that the LCD is stuck while the code seems to achieve lock. The code is from 3 Dec 2021: https://github.com/erik

The following files and folders have been updated in the Files area of the HBTE@groups.io group. /Q&D GPSDO/GPS_Si_52.ino By: Bill Buoy <bill@...> Description: updated sketch for the GPSDO

I finally got the proper pinout completed and simpleSA boots up on screen, but errors out with "TX Si4432 Reset failed - _cs = 5", I had run across a post about this before but can not find it with an

Bill Buoy <bill@...> added folder /Q&D GPSDO

I have built the analyzer per dave M0WID design, tried to compile the arduino sketch for it version 1.4 , have corrected all errors so far (esp32 libraries were not loaded correctly by boards manager)

I have ordered a limited batch of boards from JLCPCB for the QEX September/October 2021 “Miniature SMA Step Attenuator” pp 9-21 by Tom Alldred VA7TA. If you are interested in a board, at $3.00 ppd CON