===== Radio system =====
<label>sub:Radio-system</label>

The first goal of the software-radio was to enable a two-way transceiver on a
2.4GHz link. Use the setup described here:

==== Hardware-setup ====

For a radio transmission, the setup in Figure <ref>cap:Radio-setup</ref> must be done
on both radios.
It is necessary to have frequency doubler exactly as shown in the figure and
not attached to the output of the 8-way splitter, as one may try to do to get
rid of the 2-way splitter.
Otherwise the clock-signal for the ICS-554 card would be too weak.

<figure>en:research:sr:manuel:sradio-setup|Radio-setup|cap:Radio-setup</figure>


==== Software-setup ====

In order to be sure that the STD-software is loaded in the FPGA, process as
described in section <ref>sec:FPGA</ref>.
If that is not the case, reprogram the FPGA with the STD-software.

The software needs to be run on both radios, //radio1// and //radio2//.
On one radio you have to run the sender (BS), on the other radio the receiver
(MS).
To start the sender, run the following commands:

<code>
cd $SRADIO/Radios/Image/BS

make rf_show
</code>

For the receiver you have to log in to the other radio and run the following
commands:

<code>
cd $SRADIO/Radios/Image/MS

make rf_show
</code>

on the receiver side. If it doesn't work, go through the following checklist:

  * all cables correctly connected
  * power is applied to all elements (50MHz clock and RF-cards)
  * RF-cards are connected with the right flatband-connector
  * Using the Rohde \& Schwarz signal analyzer to check for a singal at 2.38GHz