FYI...
---------- Forwarded message ---------
From: Rich Gopstein <rich(a)ourowndomain.com>
Date: Sun, Feb 28, 2021, 5:04 PM
Subject: Re: ax5043 RSSI calibration
To: Burns Fisher (AMSAT) <wb1fj(a)fisher.cc>, Zach Metzinger <
zmetzing(a)pobox.com>, Eric Skoog <eric.n.skoog(a)gmail.com>
And I just double checked the secondary ax5043 again - and it varied in the
-97 to -90 range with a dummy load, but didn't go any lower than that.
Note that on my board, I don't have mmcx connectors, only coax soldered to
the board with SMA connectors on the other end, so maybe that's the problem?
Rich
On Sun, Feb 28, 2021 at 4:51 PM Rich Gopstein <rich(a)ourowndomain.com> wrote:
> Sorry - you're right - I just checked my notes again, and one of my two
> ax5043's did go down to -115 with a dummy load. The other only went down
> to -90 or so.
>
> Rich
>
>
> On Sun, Feb 28, 2021 at 4:50 PM Burns Fisher (AMSAT) <wb1fj(a)fisher.cc>
> wrote:
>
>> Hmm. Odd. With no signal being sent at all, I'm at -114 or so. Do you
>> get that kind of value with no signal in the air?
>>
>> Good to know it is pretty good though. And on the other end, we are
>> unlikely to get a signal as strong as -27!
>>
>> Thanks for checking!
>>
>> 73,
>>
>> Burns Fisher, WB1FJ
>> *AMSAT(R) Flight Software*
>>
>>
>> On Sun, Feb 28, 2021 at 4:44 PM Rich Gopstein <rich(a)ourowndomain.com>
>> wrote:
>>
>>> Using the new "get rssi" command, I checked the calibration of the RSSI
>>> when driven with my HP signal generator tuned to the input frequency.
>>>
>>> The reported values closely (within 2-3 dBm) matched the generated power
>>> between -90 dBm and -30 dBm. -27 dBm was the largest RSSI value reported
>>> by the ax5043 even with increasing input power.
>>>
>>> One of the two ax5043s was able to go down to -97 dBm, the other one
>>> only went down to -90 dBm (more or less).
>>>
>>> Rich
>>>
>>>
