Current Engineering Project

I keep this engineering notebook more for my own use more than for any other reason. It's invaluable when trying to find a solution to a problem I know I've solved before. You are welcome to browse though it to see what it takes to build a SETI station.

Questions - Comments eMail me! I will respond.

You can access earlier chapters from the main menu (Engineering | Notebook) or use the custom search below. This section changes a lot so refresh your browser and Let Google do the search for you (below):

Google Search of SETI Net

Volume 13 Chapter 75

433 - Audio to Spectrum Analyzer - 2019-03-01

Good old Microsoft has made a Windows 10 update that broke the Spec Ana. I could get no audio to it. This is the fix.

  1. Settings | System | Sounds | Other sound Options |
  2. Adjust the Spectrum Analyzer slider

432 - Antenna Running Again - 2019-03-01

I finally got the antenna El rotor running right. I had to remove the transition plate and drill new holes in the mount itself. Seems to work right now. The 8 tooth sprocket seems to work.

We will see.

431 - Roller Chain Dimensions - 2019-02-28

I came across this chart of chain dimensions and thought it would be a good thing to keep. This is for a #35 chain.



430 - Sprocket- 2019-02-26

I'm having trouble with the antenna El motor again. The drive sprocket is putting a lot of strain on the motor and I'm afraid it will cause something to break. I'm trying to find a replacement but they seem to be in short supply.

The original seems to be 8 tooth, 1 inch long, 0.3" pitch. s I found a 'Browning 35B8' that looks right and I have it on order. We will see.

429 - HackRF Setup- 2019-02-13

I found the right combination for setup of the HackRF receiver.

  1. Band Width = 4 MHz
  2. LNA = 40 dB
  3. VGA = 30 dB
  4. Ex Amp = On
  5. Ant Pr = Off
  6. Display = -30 dB

This results in 31 dB gain with a noise floor of -140 dBm as shown below. It all so allows the SDR Console software to zero out the DC component in the center of the display.
The -110 dBm test signal is from a lab synthesizer


429 - Administrator permission - 2019-01-28

I keep getting this message from Directory Opus or the File Explorer.

"you'll need to provide administrator permission to delete this folder"

This is the fix.

Go to the drive that contains the file or Folder whose ownership you want to change.

  1. Right Click of mouse on that file or Folder and Choose “Properties“.
  2. Navigate to “Security” tab.
  3. Click on Edit, then click Add.
  4. Under the "Enter the object names to select box"- type "Everyone"(without quotes) and click on "Check names".
  5. Click Ok
  6. A new window will open up with Security tab- Under "Permissions for Everyone", Check mark the "Full control" option.
  7. Apply and Ok.

428 - New Project - 2019-01-01

I have the SETI Station up and running pretty well and have all but given up on the Cosmic Ray Detectors so I am moving on to the Brain. I want to build a simulated neuron mesh on an FPGA.

Its a start.