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50 Ohm test probe - RF Cafe Forums
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| jom
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Post subject: 50 Ohm test probe
Posted: Mon Jul 16, 2007 12:08 pm
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| Captain |
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Joined: Fri Jan 26, 2007
2:40 am
Posts: 23 |
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Hello
Does anyone have a simple RF 50 ohms
test probe idea (either build or buy) for testing
a relatively low frequency radio (<500 MHz).
The probe will connect into a 50 ohm spectrum analyzer
but it has to not significantly load the point being
tested. I need to be able to troubleshoot through
a series of amplifiers to find any gain problems
and whatnot.
thanks
jom
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sm7ovk |
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Post subject:
Posted: Mon Aug 27, 2007 3:52 pm
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Joined: Thu Jan 11, 2007
12:59 pm
Posts: 16 |
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Hi!
At some occasions I have made a simple
probe by taking a coaxial cable and soldered a small
capacitor at the end, in your case a couple of pF.
In this way the load on the objekt is small - if
the capacitor is small. Ground the coax by holding
the shield to the PCB-ground. If the ground is a
couple of cm from the measuringpoint doesn't matter
at 500MHz.
Regards and good luck
Jens
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maxwell |
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Post subject:
Posted: Wed Sep 19, 2007 9:21 am
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Joined: Mon Sep 01, 2003
6:59 pm
Posts: 24
Location: Boston
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Check eBay for a used 50 ohm probe. I've seen them
go for well under $100.
...Max
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jom |
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Post subject:
Posted: Tue Oct 16, 2007 1:17 am
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Joined: Fri Jan 26, 2007
2:40 am
Posts: 23 |
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Posted 11/12/2012
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