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Re: 0dBm and -60dBm calibration

 

What I am saying here Hans is that 0dbm is no use to check an Antuino unless
we have a 20db attenuator.

Calibrator will be useful for the Antuino between -20 and -80

Just like you are using a clock osc for signal reference, Antuino used the internal
osc level for calibration. Its pretty accurate, worst case is 2db error but mostly
1db. We can do better with AD8310 which is 0.5db with 20mv/dbm compared to
AD8307 which is 1db error and 25mv/dbm. That mod will need sketch correction.
Waiting to try that once I get back to town.

Initially drove me nuts so I call it Mentuino!

Raj


At 13/09/2019, you wrote:

Hi Raj

> AFAIK the Antuino reads from -20dbm to -100dbm at the input. The IF amp amps?
> the signal? by 30db making the -20dbm at input into +10dbm at the AD8307. The
> sketch takes care? of the maths. Any higher level than -20 needs external?
> attenuator (probably internal in? the next version?).

Question is - if the Antuino (or any other piece of test equipment) says -34dBm (for example) on its screen... how do you know the accuracy of that??

This calibration generator generates both 0dBm and -60dBm signals so the latter would be suitable for Antuino testing.?

I do have a Dayton Antuino so could try it. But I am waiting on the upgrade components pack...?

73 Hans G0UPL
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