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Hugen Thanks so much for the reply. Can you confirm this would be a replacement for it https://www.digikey.ca/en/products/detail/nxp-usa-inc/BGA2817-115/2832873?s=N4IgTCBcDaIEIHECCYAcBGA7CAugXyA I

U14 LNA is damaged.

Can anyone help regarding posts 19061 and 19063 specifically the 3 failed self tests and what could be wrong with the unit? Thanks

I must say that I haven't used my NanoVNA for diplexer adjustments, I have a VNWA which was used. Just on that topic a mate who also has a VNWA compared it to a HP Agilent the scans were identical up

Be careful of how much broadband power your noise generator puts out lest it overload the SA front end.? You definitely won't be able to use the LNA! I just measured and my 3-MMIC "NOISE SOURCE

OK. I have never used the BB noise technique for high dynamic range measurements. I have other test equipment for those purposes. But, for amateur application (not for tuning cavities), it works

The problem with using wideband noise sources is that the total power output can easily exceed the safe maximum power input limit of the Spectrum Analyzer if one is not careful. If you keep the total

For filters, not active devices (!!), one can amplify the BB noise to the point where a good SA is able to display (maybe barely) 100 dB of dynamic range. All my "professional" SAs are capable of

Dave, can you explain how you can reach a high dynamic range, such as 100 dB, using a noise source? This because this thread seems to focus on high dynamic range measurements. -- Designer of the

BTW: Zener diodes make wonderful BB noise generators when biasef just breaking into the Zener knee! Follow that with a few MMICs to increase amplitude and finally a 6 dB resistive attenuator for

May I suggest yet another cheap solution for a tracking generator for use with the TINYSAs? This has been used extensively with many SDRs as well. A good flat output noise generator makes an

There are some problems with building a tracking generator for the Ultra LO output is possible through the CAL port using CONFIG/MORE/LO OUTPUT but the level is somewhat lower then with the tinySA

Also please note: This is a tracking generator for the TinySA not the TinySA ultra.. To build a tracking generator for the tinySA is relative easy even with the need of high isolation. To build a

For those that do not have a translator here is the text of Valentino's post: The Nanovna is a low-cost, very versatile and easy-to-use instrument. It has a mediocre dynamic range and is very useful

The N2PK VNA can achieve measurements as low as -120 dB, but its frequency range is limited to 60 kHz to 60 MHz.

Il Nanovna è uno strumento a basso costo, molto versatile e facile da usare. Ha una gamma dinamica mediocre ed è molto utile per visualizzare la curva di risposta di un filtro. Tuttavia, se

Ideally, yes.? But finding a VNA that costs less than $500 that has the dynamic range and sweep speed to do so real-time does not appear to be currently available.? My main point was that there are

To adjust diplexers, duplexers filters etc better off using a VNA. A spectrum analyzer / tracking generator only provides amplitude, a VNA measures S parameters i.e. amplitude and phase etc. Always

I just checked my litevna and above 3.5Gz you don't get anywhere near 80 dB of dynamic range.? I haven't read the full article but for tuning duplexers a tracking generator could be a handy

Thank you, pa3cqn. That's a perfect explanation. It really helps me.