How to measure received power from s21 of antenna?

[G7RUX]

But the transmitter should be rated for 100% duty cycle for a beacon, right?
When the FCC talks about MCW, are they talking about cw with a single sideband or DSB (or both)? ,
I always thought it was DSB.
Thanks
Joel

One would expect so, yes, otherwise it would likely fail after some time of running.

In short, power rating duty cycle is subtly different from the duty cycle of an individual signal so this may be where some of your confusion is coming from.

As regards MCW, there are lots of ways it can be achieved, ranging from full DSB AM, through full or pilot carrier SSB (these three could be generated with a stable carrier and key the mod, or key the whole thing), pure SSB, FM with keyed tone, pretty much any way you can think of to make a modulated signal that you can key in some way.

 

[AB5ID]

Hello,
In keysight VNA I found this option for measuring power. is it the right option here?

That measurement looks like it is in Log Mag which can be used to calculate power ratio. According to the article referenced earlier, you need three antennas.
1) A radiator antenna on port 1 (don't care about its characteristics.
2) A the reference on port 2.
3) The antenna under test on port 2 after calibrating with the reference antenna.

Do a S21 thru calibration using antenna 1 (radiator) and antenna two (reference) then replace the reference antenna with the antenna 3 (antenna under test). Now you have the difference in DB between reference and antenna under test.

Not sure this is exactly what you are looking for??? If not let us know.
Just curious is the for school , work or something else??? There might be other forums for RF and microwave engineering that can give better more academic answers.

 

[prcguy]

Hello,
In keysight VNA I found this option for measuring power. is it the right option here?


hi it is real measurements for mm-wave band antenna 30 GHz

I would have to go through the menus to see what you are looking at. A received level of -53dBm is believable for what you are doing.

 

[jawad231]

Thank you, guys. I found the gain by using the following formula
k(dB) = S21(aut) - S21(ref)

G(aut)= G(ref) + k(dB)

I know G (ref). It is 19 dB.

it is university subject project.

 

[G7RUX]

Thank you, guys. I found the gain by using the following formula
k(dB) = S21(aut) - S21(ref)

G(aut)= G(ref) + k(dB)

I know G (ref). It is 19 dB.

it is university subject project.

Yep, K-factor/figure is your friend...