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FvM, cariban thank you!
These two pads are the RF In/Out and GND of an active circuit working in the 2.4GHz band which is implemented on the PCB. At a later stage they will be connected to the antenna feed of the device. To test the circuit at this point the pcb is placed in a bed-of-nails...
Hi all,
I am looking for a reliable way to measure return loss between two pads on my pcb.
Does soldering a piece of coax feed line give me reliable results?
Are there any considerations e.g. length?
Thank you
Since I don't have a load pull handy, I thought of a comparative measurement to see if there really is a difference in source impedance between different power levels:
Connect the source to a terminated directional coupler and measure the return loss from the In_Cpl/Out_Cpl power difference with...
Thanks for your comments cariban.
But I'd like to improve this to have a better match with the VNA, is there a way to achieve phase detection by setting up the SA to trigger with the SG?
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BigBoss,
I understand, but the question is what is causing the difference and how can...
Is there a standard setup for measuring the return loss(source impedance) of an RF source while it's transmitting?
Someone recommended A VNA sweep at frequencies close to the TX frequency, but I am not convinced because I have seen different results for freq.s lower/higher than the Tx.
And...
Hi All,
I am trying to measure the return loss of a number of passive loads using a directional coupler + signal generator(SG) + spectrum analyzer(SA) with the setup shown.
I basically generate a CW at 500MHz with the SG and feed to the coupler and
a) terminate the out-cpl port and measure...
I figured out the problem guys, the probe connected to ch2 was faulty. It was only picking up a small fraction of the signal. Measuring with a good probe both measurements give same results. Thank you all for your suggestions.
I believe it's set to measure peak but I'll double check
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- Both GND clips are tied to the circuit/supply GND.
- Both channel are set to 1M ohm and DC coupling
- I believe the gains are set to 'Auto' but I'll double check
- The math function will give the same result as...
Sorry Guys, I took the measurement in a hurry and forgot to change the labels they belong to a previous measurement. Ch1, 2 are connected to the points that I marked in the schematic
The Schematic shows part of a circuit that I am working on. I need to vary the current through the diodes using the series resistor R and take measurements. I have tried this in two ways:
a- using a scope current probe and
b- using two scope voltage probes to measure the voltage drop across...
Re: RF Filter prototyping
Thanks SLK001, but how do you make your prototypes?
Is there a prototyping board that you recommend?
How do you go about choosing your components to make sure they behave as expected at these frequencies?
RE: RF Filter prototyping
I need to make a passive band-reject filter in the 400-600MHz frequency range. I have found some design tools online, but does anyone know of any reliable prototyping method? Do I have to use surface mount components at these frequencies or can I still get away with...
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