Search found 206 matches

by SteveAndrew
Fri May 03, 2019 7:35 am
Forum: Spectrum Analysis
Topic: Feedback for version 1.0a here
Replies: 100
Views: 23653

Re: Feedback for version 1.0a here

contrary to what the documentation says the command sent by the analyser in "spot mode" is "dds" and not "SPOTF" HI Either will work, "DDS" was used on an older version of the firmware and the command has not been updated. the spot frequency is limited to 90 ...
by SteveAndrew
Wed May 01, 2019 7:09 am
Forum: Spectrum Analysis
Topic: TrackGen interaction details
Replies: 3
Views: 1254

Re: TrackGen interaction details

Hi Susan You're welcome. I'll be interested to see what you make of the AD9910. It's on my list, but not right now - to much of a distraction until I get the beta version ready. I was just looking through some code and spotted an error in the information I gave you. The response from the firmware to...
by SteveAndrew
Tue Apr 30, 2019 10:10 am
Forum: Spectrum Analysis
Topic: TrackGen interaction details
Replies: 3
Views: 1254

Re: TrackGen interaction details

Hi Susan Yes, you're right, the manual needs more work - but it is an 'Interim' manual. The Trackgen system was initially implemented with just the AD9850 and AD9851 in mind. The interface was kept as simple as possible as I was more interested in getting a result to work with, than I was with a rob...
by SteveAndrew
Mon Apr 29, 2019 12:34 am
Forum: Spectrum Analysis
Topic: Virtual Trackgen
Replies: 30
Views: 10693

Re: Virtual Trackgen

I’m using the Arduino UNO (Chinese). Connection sometimes requires a couple of goes, but when connected sweeps as designed. I did notice that the 9851 amplitude reduces quite a bit towards the top end of its range. This isn’t an issue for narrow band sweeps. Hi Graham Thanks for the information. Th...
by SteveAndrew
Sun Apr 28, 2019 4:16 am
Forum: Spectrum Analysis
Topic: Virtual Trackgen
Replies: 30
Views: 10693

Re: Virtual Trackgen

All up and running. Checked spot frequency @ 10Mhz and bang on. Hi Graham Is that with the Arduino running the Trackgen firmware ? - If so, did you experience any problems getting the analyser to connect to the Arduino module ? which Arduino module are you using ? I'm wondering if there are any pla...
by SteveAndrew
Sun Apr 28, 2019 3:54 am
Forum: Spectrum Analysis
Topic: Feedback for version 1.0a here
Replies: 100
Views: 23653

Re: Feedback for version 1.0a here

Hi Robert I forgot to mention: If you experiment with the IF gain and the RF Gain Reduction controls, you will see how the various gain settings affect the noise floor level. With the analyser, the IF and RF gains are set according to the selected reference level. HIgher reference levels will result...
by SteveAndrew
Sun Apr 28, 2019 2:45 am
Forum: Spectrum Analysis
Topic: AD9850-ARDUINO Interconnect
Replies: 16
Views: 3042

Re: AD9850-ARDUINO Interconnect

Mike, I noted the same fall-off in sine wave output compared to the square wave out on my 9850. I attributed this to the LP filtering used to convert the square wave to a sine wave. I think I saw on a YouTube video somewhere this is "normal" Jimjrjjrj WA8MPA Hi Jim and MIke The fall in am...
by SteveAndrew
Sun Apr 28, 2019 2:30 am
Forum: Spectrum Analysis
Topic: Feedback for version 1.0a here
Replies: 100
Views: 23653

Re: Feedback for version 1.0a here

Hi Steve, thanks for your reply. I switched off the AGC-Function in SDR Uno but it seems its doing some kind of AGC anyway when crossing the Filter Boundaries cause the RF-Gain Slider is changing by its own. So my test was not valid i think. Regards Robert Hi Robert The AGC button on SDRuno is not ...
by SteveAndrew
Wed Apr 24, 2019 11:30 pm
Forum: Spectrum Analysis
Topic: Feedback for version 1.0a here
Replies: 100
Views: 23653

Re: Feedback for version 1.0a here

Hello Steve, I am not sure if I got it right. I played around with the Ref-dBm-Setting and dht dBm Trim: changed it to a different value (e.g. 10) and changed it back to 0. The effect of the change was visible in the curve immidiatly. After changing it back in the next scan the same curve as shown ...
by SteveAndrew
Tue Apr 23, 2019 12:26 pm
Forum: Spectrum Analysis
Topic: Feedback for version 1.0a here
Replies: 100
Views: 23653

Re: Feedback for version 1.0a here

Hello Steve, I noticed that on the boundaries of the filters at 250Mhz and 420Mhz are big steps in the spectrum plots. Is the noise floor level of the input circuit that different between the different zones of the input/filter circuits? If i repeat this tests with a noise generator the steps are n...

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