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Justin CrooksModeratorJustin Crooks August 25, 2025 at 10:01 am in reply to: SM200B receive problem in low frequency band //php bbp_reply_id(); ?>
MMark,
Below about 160 MHz, the SM-series is in its direct conversion band. But in order to squeeze this into our normal I/Q signal processing, we do an upfront digital tune for some combinations of center frequency and bandwidth. This will ultimately move the pass band, and will digitally filter out some frequencies. If you email our support team, we can go into more specifics for your use case, but this might be what you’re observing.
Justin CrooksModeratorRlisboa,
For Spike feature requests, please email support@signalhound.com. We try to add features periodically, based on how many customers are requesting the feature. If there is a competitor’s product or application with these features, please include a link. Thank you!
Justin CrooksModeratorI believe there are 9 markers, and we do have a max hold line, as well as channel power features that might be better for channel monitoring. We have a separate interference hunting mode as well. But if you’re used to a specific piece of software that does exactly what you need, Spike will not have all of the features of a dedicated live broadcast spectrum monitoring application.
You can install the software and play with the demo to get a feel for how well the features will work for your application.
Justin CrooksModeratorJustin Crooks July 21, 2025 at 8:53 am in reply to: Spur reject not available for SP145 //php bbp_reply_id(); ?>
Mehdi,
It is high on our list of requested features, but has not been implemented yet for the SP145.
Justin CrooksModeratorYes, if you aren’t planning on using 2.92mm cables, the 2.4mm to SMA would be a good choice.
Justin CrooksModeratorJustin Crooks April 25, 2025 at 12:47 pm in reply to: Spike’s phase noise analysis is now a paid add-on! //php bbp_reply_id(); ?>
Thank you for everyone’s feedback. We have indeed made a significant investment on our new and improved phase noise measurement tool to include many value added features such as auto signal search, spur rejection, peak tracking, amplitude noise measurements and even cross-correlated phase noise and VCO testing with the PN400.
For non-PN400 users, we hear you, and we are currently working on a long-term solution. In the meantime, we will continue to support customers using our legacy phase noise analysis mode. If you need to reinstall the legacy software for any reason, drop us a line at support@signalhound.com and we’ll send you a link.
Justin CrooksModerator- This reply was modified 5 months ago by
Justin Crooks.
Justin Crooks April 7, 2025 at 12:00 pm in reply to: Strange spurs in SP145 without input signal //php bbp_reply_id(); ?>
Mehdi,
Signals present when the input is terminated are “residual responses” or sometimes “residual spurious”.
The specification for the BB60D is -120 dBm. This is one of the strengths of the BB60D.
The specification for the SP145 is -103 dBm, similar to the BB60C.
This is not directly related to the preselector, and is more closely related to filtering and isolation differences in the architectures.
Justin CrooksModeratorRoman,
We have some customers who use the PPS from an external GPS as the trigger input. This marks the sample in an I/Q stream at the top of the second. The time stamping requires a little more work on your part, as you would need to interface the GPS yourself and generate the time stamp based on trigger position.
Justin CrooksModerator- This reply was modified 5 months, 2 weeks ago by
Justin Crooks.
Justin Crooks March 20, 2025 at 3:29 pm in reply to: Pros and cons of no preselector filters //php bbp_reply_id(); ?>
Mehdi,
The standard approach is a high pass (often with an attenuator) for checking harmonics without a preselector. There is still a bank of low pass filters before the mixer, but not before gain control, so you end up with harmonics that may be higher than they actually are. I think you can expect -40 dBc or better, but if you need 60 dB a high pass filter would be needed. Something like this would work for 2.4 GHz harmonic testing:
https://www.minicircuits.com/WebStore/dashboard.html?model=ZHFG-K4000%2B
Justin CrooksModerator- This reply was modified 5 months, 3 weeks ago by
Justin Crooks.
Justin Crooks March 19, 2025 at 8:44 am in reply to: Pros and cons of no preselector filters //php bbp_reply_id(); ?>
Mehdi,
That’s a good summary. A preselector really helps eliminate spurious responses from out-of-band signals, but adds noise figure.
Our products with preselectors (BB60D and SM200) are ideal for spectrum monitoring and harmonics measurements.
Our low-IF architecture products (SM200 and SP145) have the best dynamic range and flattest IF, making them ideal for modulation analysis.
For many applications, preselection can be accomplished with an external band pass filter. Mini Circuits is a good source for these.
Justin CrooksModerator- This reply was modified 6 months ago by
Justin Crooks.
- This reply was modified 6 months ago by
Justin Crooks.
Justin Crooks March 4, 2025 at 8:09 am in reply to: Spur only visible in BB60D real time mode //php bbp_reply_id(); ?>
Each product line is a bit different. But for all of them we have a “spur reject” mode (under settings) where two different LO frequency results are masked together to eliminate most spurs. For measuring CW signals this is a good approach, but you lose the real-time nature of measurements in this mode.
The BB60D, being a double conversion superhet, will probably have the most consistent behavior across frequency.
Also keep in mind the BB60D spur shown is -77 dBm. Your bottom picture has a spur of -78 dBm, you just don’t notice it because of the noise.
Edit: I should add that all of our spectrum analyzers, in real-time mode, use a larger set of LO frequencies than sweep mode.
Justin CrooksModerator- This reply was modified 6 months, 1 week ago by
Justin Crooks.
Justin Crooks March 3, 2025 at 12:50 pm in reply to: Spur only visible in BB60D real time mode //php bbp_reply_id(); ?>
Mehdi,
I think this is a spur from the real-time mode. Sweep mode lets us choose optimal LO frequencies, but real-time mode does not. This can result in additional low-level spurs, like this -77 dBc spur you found.
If you suspect a spur in real-time mode, set your span to, say 20 MHz, and step your center frequency by 5 MHz. This will configure the LO for a new frequency and result in a different set of potential spurs. If the spur doesn’t move, it is much more likely to be real than if it does.
Justin CrooksModerator- This reply was modified 6 months, 2 weeks ago by
Justin Crooks.
Justin Crooks February 18, 2025 at 12:58 pm in reply to: Measurement of CTCSS or Pilot Tone Frequency //php bbp_reply_id(); ?>
Jay,
Our Audio Demod tool in Spike would be able to give you the exact frequency of the audio pilot tone, but unfortunately it clamps to 20 kHz. In normal swept mode your accuracy will be limited to your RBW. Marker peak, delta, next peak would give you the audio frequency +/- your RBW. An RBW of 1 Hz would give you a 1 Hz accuracy. If this is not accurate enough, the next step would be to either put in a request for us to increase the maximum audio frequency in the Audio Demod mode, or use the API and do the FM demod yourself.
The peak deviation can be viewed in zero span mode FM, as you did. Measuring a local max, then a local min, with markers, should give you a peak-to-peak deviation.
Justin CrooksModerator- This reply was modified 7 months, 1 week ago by
Justin Crooks.
Justin Crooks January 30, 2025 at 8:19 am in reply to: VSG60A With External Reference //php bbp_reply_id(); ?>
I believe the SA124B uses a digital correction for its OCXO frequency (it is not a voltage-controlled OCXO like the SM200). For zero frequency error, put both the SA124B and the VSG on a common external 10 MHz reference.
If you selected an external reference on the VSG, and generated a 1 GHz signal, I would expect the signal to be off by more than 10 kHz if the external reference was not found.
Justin CrooksModeratorJustin Crooks October 30, 2024 at 9:59 am in reply to: New SM receiver to 75 GHz //php bbp_reply_id(); ?>
APetrovic,
We do not have any public plans to go to higher frequencies at this point. But we would love to hear about your application / use case if you’d be willing to share details. Email justin (at) signalhound.com
Thanks!
Justin CrooksModeratorJustin Crooks October 7, 2024 at 8:26 am in reply to: SP145 Unknown Trigger Resolution //php bbp_reply_id(); ?>
Tim,
I believe the trigger resolution is 122.88 MHz, or roughly 8.14 ns. This is 1/2 sample resolution at the highest data rate.
Justin CrooksModeratorJustin Crooks August 28, 2024 at 4:24 pm in reply to: What drives the 10 dB greater dyn range for the BB60D? //php bbp_reply_id(); ?>
Andrew,
The BB60D was a complete overhaul of the C. Every part was selected to optimize dynamic range for the power budget. The first thing people notice is that full sensitivity is reached with a -30 dBm reference level instead of a -50 dBm, so signals have to be 20 dB stronger to overload. The second is with preselection, signals at 1/2x or 2x your signal of interest are filtered before any amp or mixer.
Being that close, the jammer won’t be filtered out by the preselector, but the extra 20 dB before overload will make a big difference.
It looks like the preselector band breaks didn’t make it into the manual. They are at 130, 210, 310, 450, 650, 950, 1350, 1950, 3010 and 4210 MHz.
Justin CrooksModerator- This reply was modified 1 year ago by
Justin Crooks.
- This reply was modified 1 year ago by
Justin Crooks.
Steve,
You can communicate with the API without Spike running, but Spike is required for SCPI. There is a hidden mode if you don’t want it visible.
Justin CrooksModeratorJustin Crooks August 2, 2024 at 1:51 pm in reply to: Dual Transmitter hunting //php bbp_reply_id(); ?>
I suppose if the problem is locating an interfering transmitter, a directional antenna and walking around your job site might do the trick. You can get a log periodic directional antenna for $70 or so from Digi Key. https://www.digikey.com/en/products/detail/te-connectivity-linx/ANT-DB1-LP-RM-01-N/2402472
Justin CrooksModerator- This reply was modified 1 year, 1 month ago by
Justin Crooks.
Justin Crooks August 2, 2024 at 9:23 am in reply to: Dual Transmitter hunting //php bbp_reply_id(); ?>
There are other methods as well. If you are able to lock and decode the stronger signal, you can sometimes digitally regenerate and “subtract” it then look at what’s left. But this might not work well if they are nearly identical signals.
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