Re: [Discuss-gnuradio] About Baisc TX/RX power

[Marcus D. Leech]

On 28/03/2011 4:29 AM, Songsong Gee wrote:
> I used to work with RFX 400 for wireless communication
> Now, I have to change daughterboard to BasicTX/RX
>
> And then, received signal is not much strong as RFX 400
> It's to weak
> Other conditions are all same, except boards.
>
> Are Basic TX/RX not appropriate testing wireless communication?
>
> And if I MUST use this boards...
>
> What maximum gain value can I set in USRP sink and source?
Neither the BASIC_RX nor LF_RX include any gain elements.  You can 
usually use the BASIC_RX "naked" to pick up strong local AM and
  HF stations, but you'll usually need *some* gain/filtering in front 
for anything non-local.  The design goal for the BASIC_RX/TX was
  to provide a simple interface to the "raw" ADC/DAC, with many people 
using them to deal with the IF in an external radio.  Although
  many also use the BASIC_RX as an HF receiver, with only minimal 
amounts of gain/filtering in front.

Similarly the BASIC_TX/LF_TX have no gain elements, and will only emit 
somewhere in the neighborhood of 5dBm or less.