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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Satellite Meters and Installation Equipment
Using the "138MHz-4.4GHz USB SMA Source/Signal Generator/Simple Spectrum Analyzer" for TV/CATV/SAT
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<blockquote data-quote="vma" data-source="post: 991474" data-attributes="member: 256592"><p>Hi,</p><p></p><p>Sorry for the late reply.</p><p></p><p>The original NWT hardware used a PIC, not sure what mixer was used.</p><p></p><p>This cloned version uses one ADF4350 (a ADF4351 version is available, also, at higher price, covering 35MHz-4.4GHz). It uses an Atmel controller, programmed to behave like the original NWT. I haven't even tried to extract the firmware, as I assume it has obviously the lock bit enabled.</p><p></p><p>Regarding the AD conversion: I am not sure, but it is likely that the Atmel takes care of it.</p><p></p><p>It is a bit slow, but then, not that slow: I have professional field meters which are much slower than that.</p><p></p><p>I considered CSV export, just haven't had time to implement it. If you want to do comparisons, you can for the time being use the TRACE functionality and render MIN, MAX, AVG traces together with the LIVE trace.</p><p></p><p>The thing is: as soon as you are able to save the trace, you want to be able to load it in again and then there is a huge problem: what if you load a trace from a different frequency range, than the one being rendered live? Should the loaded one be shown partially or should the live one adjust to the frequency range of the saved one? It is easier to implement the latter one.</p><p></p><p>It is definitly on my list.</p><p></p><p>The other HUGE issue: calibration! This is IMHO the real deal breaker, as my software does not provide any calibration. Truth is that a spectrum analyser is not so much intendend for accurate power measurements - there are dedicated power meters for exactly this purpose and they are EXPENSIVE! The probe alone can cost over 1000 Euro... But still, the accuracy of the SMA Spectrum Analyser could benefit a lot if some calibration would be implemented. I am still considering it, but have no final idea on how to implement it.</p><p></p><p>Regards,</p><p>vma</p></blockquote><p></p>
[QUOTE="vma, post: 991474, member: 256592"] Hi, Sorry for the late reply. The original NWT hardware used a PIC, not sure what mixer was used. This cloned version uses one ADF4350 (a ADF4351 version is available, also, at higher price, covering 35MHz-4.4GHz). It uses an Atmel controller, programmed to behave like the original NWT. I haven't even tried to extract the firmware, as I assume it has obviously the lock bit enabled. Regarding the AD conversion: I am not sure, but it is likely that the Atmel takes care of it. It is a bit slow, but then, not that slow: I have professional field meters which are much slower than that. I considered CSV export, just haven't had time to implement it. If you want to do comparisons, you can for the time being use the TRACE functionality and render MIN, MAX, AVG traces together with the LIVE trace. The thing is: as soon as you are able to save the trace, you want to be able to load it in again and then there is a huge problem: what if you load a trace from a different frequency range, than the one being rendered live? Should the loaded one be shown partially or should the live one adjust to the frequency range of the saved one? It is easier to implement the latter one. It is definitly on my list. The other HUGE issue: calibration! This is IMHO the real deal breaker, as my software does not provide any calibration. Truth is that a spectrum analyser is not so much intendend for accurate power measurements - there are dedicated power meters for exactly this purpose and they are EXPENSIVE! The probe alone can cost over 1000 Euro... But still, the accuracy of the SMA Spectrum Analyser could benefit a lot if some calibration would be implemented. I am still considering it, but have no final idea on how to implement it. Regards, vma [/QUOTE]
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Satellite TV receivers & systems support forums
DISH SETUP: Single sat, Multi-Sat & Motorised
Satellite Meters and Installation Equipment
Using the "138MHz-4.4GHz USB SMA Source/Signal Generator/Simple Spectrum Analyzer" for TV/CATV/SAT
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