diff --git a/src/main.rs b/src/main.rs
index 1906530..3f98ab4 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -248,13 +248,14 @@ impl Transceiver {
                     {
                         // Wait for end of tranmission
                         let mut recv = Some(FSKReceiver::new(eyes_tx.clone()));
+                        let mut send_ack = false;
                         while let Some(iq) = squelch.next(iq_sampler.sample(sample_stream.recv().await.unwrap()))
                         {
                             if recv.as_ref().is_some()
                             {
                                 match recv.as_mut().unwrap().receive(iq).await
                                 {
-                                    Ok(Some(Frame::Data(_))) => {println!("GOT DATA"); Self::transmit(Frame::Ack, &mut sample_sender).await; recv = None;},
+                                    Ok(Some(Frame::Data(_))) => {println!("GOT DATA"); send_ack = true; recv = None;},
                                     Ok(Some(Frame::Ack)) => {current_message = None; recv = None;},
                                     Err(()) => {recv = None;},
                                     _ => {}
@@ -262,6 +263,10 @@ impl Transceiver {
                             }
                         }
                         println!("EOT");
+                        if send_ack
+                        {
+                            Self::transmit(Frame::Ack, &mut sample_sender).await;
+                        }
                     },
                     message = async
                     {
@@ -497,7 +502,7 @@ impl EguiApp {
                     &config.into(),
                     move |data: &[f32], _| {
                         for x in data.iter() {
-                            let _ = down_sender.try_send(*x * 30.); // non-blocking send
+                            let _ = down_sender.blocking_send(*x * 30.); // non-blocking send
                         }
                     },
                     move |err| eprintln!("Stream error: {}", err),