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Tektronix 531A How fast is it and what plugins will it accept
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Aperna1985:
I didn't see that little button to attach. Thanks. 

So basically there's no way to see 90MC on my Tek 531A?

I attached the Schematic of the radio below.
David Hess:

--- Quote from: Aperna1985 on January 18, 2024, 06:58:02 pm ---So basically there's no way to see 90MC on my Tek 531A?
--- End quote ---

That is the short answer.  The Tektronix 531A only has a 15 MHz bandwidth.  Usually an RF probe to measure the envelope is more suitable.

https://w140.com/tekwiki/wiki/531

In theory a Tektronix 1S1 sampling plug-in can be installed to allow operation up to 1 GHz, however the chance of getting this to work with such old instruments is low so I do not recommend it, and sampling oscilloscope operation by itself even when everything works is not straightforward.

https://w140.com/tekwiki/wiki/1S1
Aperna1985:

--- Quote from: David Hess on January 18, 2024, 10:06:36 pm ---
--- Quote from: Aperna1985 on January 18, 2024, 06:58:02 pm ---So basically there's no way to see 90MC on my Tek 531A?
--- End quote ---

That is the short answer.  The Tektronix 531A only has a 15 MHz bandwidth.  Usually an RF probe to measure the envelope is more suitable.

https://w140.com/tekwiki/wiki/531

In theory a Tektronix 1S1 sampling plug-in can be installed to allow operation up to 1 GHz, however the chance of getting this to work with such old instruments is low so I do not recommend it, and sampling oscilloscope operation by itself even when everything works is not straightforward.

https://w140.com/tekwiki/wiki/1S1

--- End quote ---


What equipment do I need for an RF probe and can you recommend one?
BrokenYugo:
A basic passive RF probe is a simple diode detector circuit. Maybe biased for better picking up small signals below the diode's forward voltage. Easy to DIY, you probably have enough parts to make one.

http://techlib.com/electronics/detect.htm
https://n5ese.com/rfprobe1.htm
Aperna1985:
Oh I actually already have one. I tried it but there's literally no signal anywhere. If I use my signal generator I can pass through so I know the IF section and audio amp are working. I need to check the oscillator and I'll also need the scope for aligning the Oscillator
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