Yes, presets for these 2 devices should be compatible. Your client should be able to load your generated presets.

There is no road map or timeframes we are targeting. We are releasing updates as we can allocate engineering resources to them. I will be sure to reply to this thread when there are any updates to our ARM offerings.

Hi Jequin,

We have not yet built a LabView wrapper project for the SP145 API. It should be possible. One approach I could suggest now is to look at the SM LabView project and adapt it to the SP API. This may be difficult if you don’t have experience calling DLLs from LabView.

I don’t have a timeline on when we would have usable examples for the SP145 at this point.

If you attempt to build your own, and have any questions, please contact us at support@signalhound.com.

Thanks

[Andrew]

I’m using this thread as the general update thread on our ARM progress since it has the most visibility and comments on our forum. We are very much interested in supporting the ARM architecture and have been slowly adding support since our last update.

In our SDK we now have API builds for both the SP145 and SM200/435 for both the Nvidia Jetson Orin AGX and MacOS (M4 CPU). These APIs support a subset of functionality, namely sweeps and I/Q streaming with decimations up to 4, which hopefully covers most use cases. 10GbE support for our SM devices is also not supported on the Mac build, just the USB variants for now.

We are continuing to develop capability on ARM to support a larger subset of our APIs and new APIs altogether, (I.E. the BB60 API).

We appreciate everyone’s feedback and patience.

• This reply was modified 1 month ago by Andrew.
• This reply was modified 1 month ago by Andrew.

Thanks Joe!

Pooja, we have also responded to your email. For this issue we will continue our support via email.

Regards

Yes, our SM API will support interfacing 2 SM200Cs simultaneously. I would recommend using the API and C++ for initial testing and proof of concept work. MATLAB adds significant overhead for streaming I/Q especially at high data rates. Our MATLAB examples only interface 1 device so it will need to be extended to support multiple devices. Starting with C++ will also help you understand how you will need to extend the MATLAB examples.

We would also generally recommend Linux over Windows if you are going to run multiple devices at the highest sample rate (200MS/s).

Are you using GNURadio v3.10? If yes, our OOT modules were developed on v3.9 and will require porting to 3.10. We currently have this as a TODO, so it is left as a customer exercise until we can make time for this. There are some resources that might help, for instance, https://wiki.gnuradio.org/index.php/GNU_Radio_3.10_OOT_Module_Porting_Guide

A reference level of -20dBm on the SP145 achieves the minimum noise floor, but will limit input signals to ~-20dBm before IF overload occurs. On the BB60D, the minimum noise floor is achieved at -30dBm reference level.

Mehdi,

You specify an attenuation of 0dB, which for the SP145 I believe is overriding your reference level control. If you want reference level to control the sensitivity of the receiver we recommend leaving all gain/atten/preamp values to their defaults. The reference level control alone will properly set these controls behind the scenes for the best dynamic range. If you change attenuation back to Auto, with a ref level of 0dBm, your measurement should work again on the SP145.

The reason you probably don’t see the same issue on the BB60D is because you have to set both gain and atten before it override the Ref level. Again, we still recommend leaving everything auto and just using ref level, unless you have a specific reason not to.

If Spike is set to hidden mode, that dialog will not appear, but I also believe it will not automatically enter demo mode. There is not a way to automatically enter demo mode. The only way to bypass that dialog into an active state is with 1 Signal Hound device connected.

Galc,

Spike has a “hidden” mode in which you can launch the software and it only appears in the task list. You can read more about this in the manual. If the issue is that the software is visible and you want just your application showing, that might be interesting.

Hi Volgy,

Nice work for being new at this! You have largely properly characterized the functionality of the fast sweep mode. There is only one more thing to know about. To accomplish “arbitrary” RBWs, you can perform FFT zero-padding. This basically gets us the ability to configure for RBWs as if we have FFT sizes between 16 (or whatever we use as the smallest) and 16384, in increments of 1, and not just 512,1024,…,16384.

And to address your other question, you are correct, the detector is not relevant for the reason you listed.

If you need more flexibility than what fast sweep mode offers, take a look at the I/Q sweep list. This mode lets you preconfigure a list of freq steps and I/Q capture sizes, and executes them at the same speed as fast sweep mode. This gets you the time domain I/Q samples as opposed to the processed spectrum data. On the SM435C, the I/Q bandwidth for each “step” is 160MHz, so you can achieve > 1THz sweeps with the right settings. For the SM435B models, the I/Q bandwidth is only 40MHz, so it falls short of 1THz per second, and in that case the fast sweep mode is providing functionality that I/Q sweep lists cannot. The downside of I/Q sweep lists is that now you have to do your own processing, but it will let you reproduce most of the sweep capabilities offered through the sweep modes.

The concept of a preset does not exist in the API, that is only in the Spike software.

Also, you are correct, the API provides just the sweep and I/Q data from the instrument. Any measurements on the data need to be performed in your application.

As Roger noted, the SCPI commands support both loading presets and exporting trace data.

Let us know if you have follow up questions.

I have replied to the email that you also sent asking this question.

Nice find and fix!

Email me at aj@signalhound.com and lets see what we can do.

Thanks for the feedback. These are 2 highly requested items. Maybe someday! 🙂

[Andrew]

Hi Torbin,

Zero-span mode has only partial support for SCPI. There is only commands for configuring the capture and then requesting the I/Q data. To achieve the functionality of a frequency marker, you would need to pull the I/Q data, FM demodulate it, then index your FM array accordingly.

This may be expanded in a future update, I cannot provide a timeline on when this would be available.

Let me know if you have follow up questions.

• This reply was modified 2 months ago by Andrew.

Roman,

The API is setup to only return UBX messages when GPS is locked and outputting NMEA sentences. This is a result of how we package and return this data. For this reason, yes, you would need to see GPS lock before expecting messages.

Is there an event that consistently leads to lost GPS lock? Is it after sending a message? Does your GPS antenna have access to clear sky? I can’t say that I have seen a scenario or heard from a customer that a reboot of the device was required to attain GPS lock. Is it possible one of the messages is configuring the device in an undesirable state?

We only have experience sending the NAV5 message for changing the platform model. That code example is in our SDK (you probably already found it). I have not used the cold boot command. If it forces the GPS to do a cold boot, this will take many minutes or longer to get GPS lock again, I’m assuming you are waiting an appropriate amount of time?

Thank you for the feature request Victor. I will update this thread if we add something to address this.

Andrew

Did you enable the use of the GPSDO? You have to go to the Settings -> Reference menu and tell the instrument to use the reference.

Also, is your DUT being disciplined by the GPSDO?

We calibrate our devices to a GPSDO. If you just put our instrument on it, there might be minimal change (basically whatever drift there has been since we adjusted it in our facility). Once our instrument and the DUT is using the GPSDO, then I expect nominally ~0Hz offset.

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