VSG25A power looks low

Hello,

I just received my VSG25A with an USB-SA44B and a TG44A.

I tried to do a BPSK modulation on VSG and demod it on SA with a direct cable connection. Received power level looks very weak and demod looks random on Spike. What is a normal received level ? What can I do / check please ? (i have an if it can help).

Thank you.

Hello Facotl,

If you would like, you could send us an image of the spectrum. You can save an image using the file menu in Spike. You can also check the signal strength with channel power. The channel power should roughly equal the output power of the VSG. You could also attempt to demodulate the signal with Spike to ensure it is what you expect. You can also send us a screenshot of the current configuration of the VSG. It is possible the configuration you have used is one we haven’t checked and isn’t working properly.

I look forward to your response.

Regards,
A.J.

Facotl,
When using the VSG with the SA44B, you will probably want to start in real-time mode, or sweep mode with image / spur reject off (Settings menu). Then you can use a BPSK symbol rate of around 20-50 ksps. You should be able to see the modulation envelope, and measure the signal power using the channel power utility. Then you can go into modulation analysis and capture the symbols.

If you can send a picture, we may be able to help more, or you can email support at signalhound.com for further assistance.

Hello,

Thank you for your help. I re installed the driver and it fixed my problem. (USB was disconnected and reconnected too)

(info I use Windows 10 x64)

Since it’s top top top 🙂

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