Hi Andrew,

To explain why I ask, I am attempting to conduct a CW signal survey. My understanding is that in a mobile environment a narrowband signal may suffer significant fading which will cause quite some variation in the net signal over very short distances as the scattered vectors interfere. To measure the coverage it is desirable to remove the fast fading by gathering an adequate number of samples over a distance of typically 20-40 wavelengths. These samples can then be used to estimate the local mean to a given confidence interval. This general principle is known as the Lee Method.

In a test survey I can observe the deep fades, but the values I measure today are hard to reconcile because I am unsure how to setup, so any advice on how to achieve the above would be great.

Regards,

Cyprien

Hi Andrew

Thanks I tried this and it works – for some reason yesterday I could only get this working in interference hunting mode but not in sweep. I must have been impatient – maybe its because there is a sweep progress bar in the interference hunting mode.

Cyprien

Thanks Andrew,

Sounds like SCPI is the way to go and seems to support what I need.

Cyprien

I was a little surprised when I noticed the casual comment in the latest Spike release “* Added LTE measurement mode.”!

I have been playing already and am very impressed especially the cell scanner – just what I was hoping for to upgrade a monitoring station solution. Now I am really looking forward to the BB60D to make things smoke from a dynamics perspective. In a dream world API support would be utterly awesome!

Absolutely amazing work!

Thanks for the advice which is prompt and very helpful as always. I will be very happy if you are able to improve at some stage to an already great software.

Cyprien

I was a little unclear above – I understand that you can you can zoom in on the graphs like AM vs time, but I really meant controlling the window position/dimensions in the playback IQ preview graph above the play/stop/pause button.

My workflow is to play the file from the beginning, then pause and move the rectangle slowly in an interesting part (sometimes backing up), then switch and zoom in the AM vs time graph. I loose track of specific event times in the file as I only have a offset in percentage to 2dp and cannot say move the window precisely to a time that I have previously noted.

I forgot to add that I have a repeatable issue when clicking on the graph to move the window when I have very large files (e.g. >> 8 GB) in that the little window rectangle on the preview trace only moves temporarily if too far into the file (> 8 GB it appears) and will go to back to the beginning of the stream after clicking. Finally I note that in the AM vs time graph, when you zoom in the window start/stop time is updated, but the average doesn’t appear to change.

Thanks to stackoverflow.com I found a great article and now I can now reliably remote desktop from a Windows 10 client via RDP to a host system with Spike and Windows 10. This is also a cure for remote operation of various other software using OpenGL that used to crash for me.

This was done by changing the group policy for the local machine to enable the graphics card for remote desktop. To change the setting run “gpedit.msc” then navigate to “Local Computer Policy\Computer Configuration\Administrative Templates\Windows Components\Remote Desktop Services\Remote Desktop Session Host\Remote Session Environment” and then enable “Use hardware graphics adapters for all Remote Desktop Services sessions”. Alternatively modify “HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\Terminal Services” and set the DWORD “bEnumerateHWBeforeSW” to 1. Note that I had to download the latest graphics card driver and restart for all to work as the stock Windows driver wasn’t good enough.

For full information see the various contributions at https://stackoverflow.com/questions/51705471/current-state-and-
solutions-for-opengl-over-windows-remote

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