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RF Cafe Forums closed its virtual doors in 2012 mainly due to other social media platforms dominating public commenting venues. RF Cafe Forums began sometime around August of 2003 and was quite well-attended for many years. By 2010, Facebook and Twitter were overwhelmingly dominating online personal interaction, and RF Cafe Forums activity dropped off precipitously. Regardless, there are still lots of great posts in the archive that ware worth looking at. Below are the old forum threads, including responses to the original posts.

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jom
 Post subject: 50 Ohm test probe
Posted: Mon Jul 16, 2007 12:08 pm 
 
Captain
User avatar

Joined: Fri Jan 26, 2007 2:40 am

Posts: 23

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


 
   
 
sm7ovk
 Post subject:
Posted: Mon Aug 27, 2007 3:52 pm 
 
Captain
User avatar

Joined: Thu Jan 11, 2007 12:59 pm

Posts: 16

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


 
   
 
maxwell
 Post subject:
Posted: Wed Sep 19, 2007 9:21 am 
 
Captain
User avatar

Joined: Mon Sep 01, 2003 6:59 pm

Posts: 24

Location: Boston

Check eBay for a used 50 ohm probe. I've seen them go for well under $100.

...Max


 
   
 
jom
 Post subject:
Posted: Tue Oct 16, 2007 1:17 am 
 
Captain
User avatar

Joined: Fri Jan 26, 2007 2:40 am

Posts: 23

thanks for the info!

jom


Posted  11/12/2012

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