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 _______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
