Author Topic: SA6 spectrum analyzer without rf shield  (Read 2612 times)

0 Members and 1 Guest are viewing this topic.

Offline harrimansatTopic starter

  • Regular Contributor
  • *
  • Posts: 235
SA6 spectrum analyzer without rf shield
« on: October 20, 2024, 06:12:34 pm »
There is anaone with a cheap aliepress SA6 spectrum analyzer? I have just received one and is quite noise. I have taken it apart and I see that it does  not have RF shield for receiver and generator. If anyone has the same unit can please make the same meassurement that I upload? There´s not signal on SMA input.

Thanks
« Last Edit: October 20, 2024, 06:15:59 pm by harrimansat »
 

Offline harrimansatTopic starter

  • Regular Contributor
  • *
  • Posts: 235
 

Offline Kean

  • Supporter
  • ****
  • Posts: 2573
  • Country: au
  • Embedded systems & IT consultant
    • Kean Electronics
Re: SA6 spectrum analyzer without rf shield
« Reply #2 on: October 20, 2024, 08:42:36 pm »
Without anything connected to the input you are still going to pick up ambient radio signals.

Try again with a 50 ohm terminator on the input.
 

Online KE5FX

  • Super Contributor
  • ***
  • Posts: 2116
  • Country: us
    • KE5FX.COM
Re: SA6 spectrum analyzer without rf shield
« Reply #3 on: October 20, 2024, 09:27:13 pm »
What you actually wanted was a TinySA Ultra.  The Zeenko store on Ali Express sells the legitimate ones, I believe.
 

Offline harrimansatTopic starter

  • Regular Contributor
  • *
  • Posts: 235
Re: SA6 spectrum analyzer without rf shield
« Reply #4 on: October 21, 2024, 08:19:47 am »
I have one too! and other real spectrum analyzers, Thanks!
 

Offline harrimansatTopic starter

  • Regular Contributor
  • *
  • Posts: 235
Re: SA6 spectrum analyzer without rf shield
« Reply #5 on: October 21, 2024, 08:21:46 am »
Thanks for your answer Kean, but this thing has low impeadance inputs. Any way you can see the same results with a 50 ohms termination.
 

Offline electronic_guy

  • Regular Contributor
  • *
  • Posts: 99
  • Country: us
Re: SA6 spectrum analyzer without rf shield
« Reply #6 on: October 21, 2024, 10:53:23 am »
Usually the input is 50 ohms. And even after connecting the 50 ohm termination, you get these spurious signals and they are considerably larger, then it’s probably originated internally and that’s not a good sign. It could be problem with the LO, mixer, power supply issue and/or many more.  It’s also possible that without good shielding it couples external noise. No SA is perfect so there are known spurious signals that will appear on the spectrum, but these are usually noted on the documentations by the manufacturer. I recommend you return it and get your money back if it’s possible.
 
The following users thanked this post: harrimansat

Offline harrimansatTopic starter

  • Regular Contributor
  • *
  • Posts: 235
Re: SA6 spectrum analyzer without rf shield
« Reply #7 on: October 26, 2024, 11:09:33 am »
some more photos
 

Offline harrimansatTopic starter

  • Regular Contributor
  • *
  • Posts: 235
Re: SA6 spectrum analyzer without rf shield
« Reply #8 on: October 26, 2024, 07:45:59 pm »
Improved floor noise with custom made shield, 27.5mm x 24mm x 3mm
 

Offline next3tx

  • Newbie
  • Posts: 1
  • Country: fr
Re: SA6 spectrum analyzer without rf shield
« Reply #9 on: January 26, 2025, 09:01:33 am »
Seems I burned my SA6 with high power signal on input. Now trying to get IC for repair. Below photos of input part of SA6
 


Share me

Digg  Facebook  SlashDot  Delicious  Technorati  Twitter  Google  Yahoo
Smf