From faaaf59da75b2aea316f22c8196095cb398bf87c Mon Sep 17 00:00:00 2001
From: Roman Piksaykin <47501785+RPiks@users.noreply.github.com>
Date: Thu, 30 Nov 2023 23:36:35 +0300
Subject: [PATCH] Update README.md

---
 README.md | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/README.md b/README.md
index b60e6cf..3e1564a 100644
--- a/README.md
+++ b/README.md
@@ -1,11 +1,12 @@
 # pico-WSPR-tx
 WSPR beacon for Raspberry Pi Pico, based on pico-hf-oscillator PLL DCO library as submodule.
+The GPS reference is used to compensate Pico's clock drift. GPS is also used to schedule WSPR transmissions.
 
-![pico-wspr-rx](https://github.com/RPiks/pico-WSPR-tx/assets/47501785/a69103e7-d766-4554-b288-aa0f82a74da9)
-The example of this WSPR beacon (QRPX power level) reception.
+![image](https://github.com/RPiks/pico-WSPR-tx/assets/47501785/3f835a9d-fa42-4eb8-ba93-ea72033d9e62)
+The example of this WSPR beacon (QRPX power level) reception. Max QRB is ~3400 km.
 
-![Screenshot_2023-11-16_22-42-12](https://github.com/RPiks/pico-WSPR-tx/assets/47501785/dcc20f80-17c8-4c37-84e6-c162bffd8bbb)
-The spectrum of this WSPR beacon received on SSB transceiver.
+![image](https://github.com/RPiks/pico-WSPR-tx/assets/47501785/a86280b9-71cb-4bb2-8b3c-0e33d2499aca)
+High spectrum quality and less than 1Hz frequency drift.
 
 # *NO* additional hardware
 The WSPR beacon provides the output signal on the GPIO pin of Raspberry Pi Pico. No externall PLL, analog oscillators!