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Adjustable output

 

I have measured the output of the NanoVNA at around +3dBm. Is there a way to adjust this output internally? Sure I can add 20dB attenuation (and I do), but it would be nice to be able to say I want an output of -10dBm instead of adding an external attenuation.

Asking for a friend ;)
 

That entirely depends upon the VNA and what version firmware running on the
VNA.
The Latest firmware for the Nano_VNA-F can give the following levels that
are adjusted via menu selection.
Main Menu
Config
More
Power Level
+1 dBm
-1 dBm
-4 dBm
-10 dBm

Those are the only levels available in the menu selections.

Other NanoVNAs such as the H4 should have similar adjustment capabilities.



*Clyde K. Spencer*



On Mon, Jan 18, 2021 at 11:51 AM Brian Donaldson <brianb253@...>
wrote:

I have measured the output of the NanoVNA at around +3dBm. Is there a way
to adjust this output internally? Sure I can add 20dB attenuation (and I
do), but it would be nice to be able to say I want an output of -10dBm
instead of adding an external attenuation.

Asking for a friend ;)
 

OK... I have the standard H model running Hugen's NanoVNA-H_AA_20200118.dfu firmware.
 

Is that function also available on the H4


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On Mon, Jan 18, 2021 at 5:00 PM Brian Donaldson <brianb253@...> wrote:

OK... I have the standard H model running Hugen's
NanoVNA-H_AA_20200118.dfu firmware.
 

It is, under the calibrate menu, The available options are Auto, 2, 4, 6 or 8mA, yes mA.

HTH

Liam

On Mon, Jan 18, 2021 at 10:18 PM, Fred Moore wrote:


Is that function also available on the H4
 

I should add this applies to DisLord's 1.0.45 firmware.

On Mon, Jan 18, 2021 at 11:32 PM, Liam K wrote:


It is, under the calibrate menu, The available options are Auto, 2, 4, 6 or
8mA, yes mA.

HTH

Liam

On Mon, Jan 18, 2021 at 10:18 PM, Fred Moore wrote:


Is that function also available on the H4
 

i loaded my Nano with Dislord's 1.0.45 and was able to adjust the output. I started out by using a 20dB attenuation to ensure I did not violate the maximum input power on the Low Port. So, using the TinySA after removing the attenuation these are the values I got.

Auto - +2 dBm
2mA - -9 dBm
4mA - -3 dBm
6mA - 0 dBm
8mA - +2 dBm

These should be accurate enough for government work, yes?
 

Slightly different to my results, I only calibrated at 2mA and 4mA with this setup:

TinySA:
30dB attenuator on input
¡®External amplifier¡¯ setting -30dB
280MHz centre frequency, 10MHz span
Sweep setting ¡®precise¡¯
Marker set to 280MHz

NanoVNA-H4:
280MHz CW
Power level 2mA got -8.1dB on the TinySA
Power level 4mA got -2.1dB on the TinySA

Accurate enough for government use? I wouldn¡¯t think so but it depends on the requirement. If it¡¯s for quickly checking local authority 2 way radios, then possibly yes. If it¡¯s for NASA, definitely not!

Liam

On 19 Jan 2021, at 16:22, Brian Donaldson <brianb253@...> wrote:

?i loaded my Nano with Dislord's 1.0.45 and was able to adjust the output. I started out by using a 20dB attenuation to ensure I did not violate the maximum input power on the Low Port. So, using the TinySA after removing the attenuation these are the values I got.

Auto - +2 dBm
2mA - -9 dBm
4mA - -3 dBm
6mA - 0 dBm
8mA - +2 dBm

These should be accurate enough for government work, yes?
 

Liam, I got the gist of what you were saying. The government comment was in jest. :)

I wonder if #hugen could make a modification to his firmware to include power levels in dBm?

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