Add instruction for Phaser baseband

Signed-off-by: Egor Savkin <es@m-labs.hk>

src/SUMMARY.md

@@ -2,7 +2,7 @@
 
 - [Build and test firmware](./build_test_firmware.md)
 - [Hardware](./hw/hardware.md)
-  - [Sinara 4624 AWG Phaser (Upconverter)](./hw/phaser_upconverter.md)
+  - [Sinara 4624 AWG Phaser (Upconverter/Baseband)](./hw/phaser.md)
   - [Sinara 4456 synthesizer Mirny / Sinara 4457 Almazny Mezzanine card](./hw/mirny_almazny.md)
   - [SUServo (Sampler + Urukul)](./hw/suservo.md)
   - [Sinara 2118 BNC-TTL / 2128 SMA-TTL](./hw/bnc_sma_ttl.md)

src/hw/phaser.md

@@ -1,4 +1,4 @@
-# Sinara 4624 AWG Phaser (Upconverter)
+# Sinara 4624 AWG Phaser (Upconverter/Baseband)
 
 [Wiki](https://github.com/sinara-hw/Phaser/wiki)
 
@@ -22,6 +22,8 @@ Frequencies:
 phaser0 10+0 10+1 10+2 10+3 10+4 MHz
 ```
 
+### Upconverter
+
 1. Install gqrx `nix-shell -p gqrx`
 2. Connect bladeRF via USB cable only
 3. Run gqrx and choose `BladeRF #<number>...`
@@ -32,3 +34,15 @@ phaser0 10+0 10+1 10+2 10+3 10+4 MHz
 7. You should see 5 tones on `artiq_sinara_test`'s frequencies, like on the picture below
 
 ![](../img/phaser_upconverter_gqrx.png)
+
+
+### Baseband
+
+1. Install gqrx `nix-shell -p gqrx`
+2. Connect bladeRF via USB cable only
+3. Run gqrx and choose `Nuand bladeRF SN <number>...`
+4. Input rate 15000000, other settings are default
+5. When gqrx loaded, start DSP processing with frequency near 2.875 GHz + frequencies from `artiq_sinara_test`
+   in `Receiver Options`
+6. Connect the probe through attenuator to the Phaser's ports RF0 or RF1 (not the ADC)
+7. You should see 5 tones on `artiq_sinara_test`'s frequencies