[Discuss-gnuradio] RFX-2400 Max. Tx and Rx power

[Lee Patton]

This one's most likely for Matt:

I would like to connect the RFX-2400 Tx/Rx and Rx ports via coax and
some attenuators.  Here's my best guess at how much attenuation I need
when tuning to 2.4 GHz:

Rx
-----
* signal enters through HMC174MS8 T/R switch -- negligible effect
* then MGA 82563 LNA -- apx. 12.5 dB gain @ 2.4 GHz
* then AD8347-MIX -- max input of -20 dB

Therefore, max. allowable input power @ 2.4 GHz is -20 - 12.5 = -32.5 dB
(0.56 mW)


Tx
-----
* signal leaves AD834X-MIX (I assumed X = 8) -- max SSB output power of
-30 dB at 2.4 GHz.
* then MGA 82563 LNA -- apx. 12.5 dB gain @  2.4 GHz
* then RF3315 LNA -- apx. 10 dB gain @ 2.4 GHz (spec sheet only goes up
to 2.2 GHz)
* then HMC174MS8 T/R switch --negligible effect

Therefore, max. output power @ 2.4 GHz is -30 + 12.5 + 10 = -7.5 dB (178
mW)


>From these numbers I guess I need -32.5 + 7.5 = 25 dB of attenuation.
Are these number correct?  I am not exactly sure if I'm using "SSB
output power" correctly. 

Thanks,
 - Lee