Author Topic: new scope capabilitys  (Read 2301 times)

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Offline m3vuv

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new scope capabilitys
« on: November 23, 2021, 06:04:08 am »
Hi all,ive just brought one of these cheap ,Hewlett Packard HP54503A 500MHz 4 Channel Digitizing Oscilloscope, just wondered if it will be capable of doing measurements on a 70cm tx/rx?. tia
 

Offline bob91343

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Re: new scope capabilitys
« Reply #1 on: November 23, 2021, 06:27:37 am »
What are you trying to measure?
 
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Offline m3vuv

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Re: new scope capabilitys
« Reply #2 on: November 23, 2021, 06:55:05 am »
nothing at 70 cms,ive a deaf radio on 2mtrs ,i want to look at the rx signals and trace them,my other scope is 50 meggs bandwith so wondered if the new one is capable of doing this at 145 meggs.
 

Offline BrokenYugo

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Re: new scope capabilitys
« Reply #3 on: November 23, 2021, 05:15:50 pm »
Google says it's not a true 500MHz, in that it will only handle that as a repetitive signal. So I guess it would work fine for usual inject a signal and see where it stops sort of troubleshooting.
 
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Offline bob91343

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Re: new scope capabilitys
« Reply #4 on: November 23, 2021, 08:20:25 pm »
I don't know that model.  I have a 54542A that works fine well past its claimed limit of 500 MHz.  In fact I measured around 650 MHz bandwidth, very high for what I do.

Having said that, it's seldom necessary to have a wide bandwidth scope to troubleshoot a receiver.  You put a signal in and first see if you have a corresponding IF signal.  If not, the problem is near the front end.  If so, it's later in the chain.  Those radios are almost always at least double conversion so there is a second mixer to investigate.
 
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Offline max-bit

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Re: new scope capabilitys
« Reply #5 on: November 30, 2021, 10:59:34 am »
As the oscilloscope has a 500 MHz band, it measures up to about 500 MHz (usually with a decrease of -3dB) but this is not a rule.
 

Offline MF-jockey

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Re: new scope capabilitys
« Reply #6 on: November 30, 2021, 10:13:23 pm »
The probe plays an important role.
There are also nice videos from Dave

active probes

« Last Edit: November 30, 2021, 10:23:49 pm by MF-jockey »
 

Offline radiolistener

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Re: new scope capabilitys
« Reply #7 on: December 01, 2021, 03:02:09 am »
At 400-500 MHz it's better to not use probes, but use RF connectors with coax cable. Because probes are working good bellow 100-200 MHz max.
 


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