Hot take: That fancy oscilloscope I bought 3 years ago was a total waste of money

Back in 2021 I dropped $2,800 on a brand new Tektronix scope for my home bench thinking I needed all those advanced features for troubleshooting autopilot systems. Fast forward to last month when I was working on a King KX-155 nav radio at my shop in Orlando and my old beat up analog scope caught a glitch the digital one missed completely. The new one has all these decoding menus and math functions that just slow me down when I'm trying to find a bad cap or a cold solder joint. My buddy Mike has been using the same 1980s B&K scope for 20 years and his repair time is half of mine. I'm honestly thinking about selling the Tektronix and putting that money into a good soldering station instead. Has anyone else found that simpler test gear actually works better for radio work?

3 comments

3 Comments

michael_coleman103d ago

Ditch the digital scope for radio work. I did the same thing with a Rigol 4000 series I bought for automotive CAN bus stuff. For nav comm gear a good analog scope shows you signal integrity issues the digital ones smooth out. The math functions just add noise to your troubleshooting. Sell it, grab a clean used 465B Tektronix and sink the rest into a Hakko or JBC station. You'll cut your diagnosis time in half.

faith_thomas3d ago

Analog scopes show you the real signal, digital ones lie about it.

annaw733d ago

And that Rigol thing is exactly the problem I kept running into. With digital scopes you get this pretty picture that looks clean but it's really just the firmware's best guess at what the signal should be. For nav comm you need to see the actual ringing and overshoot on the waveform edges, not some smoothed over approximation. I had a Fluke 123 scope meter that would completely miss a 40MHz clock glitch on a comm radio because its sampling rate dropped in half once you added any math. The 465B will show you the ugly truth every time, especially when you're chasing intermittent stuff on a Collins radio where the waveform looks like a mess before it actually fails.