diff --git a/ofdm/ofdm_rx.m b/ofdm/ofdm_rx.m
index f3e1024..b39cff9 100644
--- a/ofdm/ofdm_rx.m
+++ b/ofdm/ofdm_rx.m
@@ -94,6 +94,7 @@ fileCunkCounter = 0;
 phi_xwav = 0;
 df_track = 0;
 df_track_ = [];
+max_H_plot = 0;
 symbol_count = -1;
 
 fileRemain = wav_size;
@@ -332,9 +333,9 @@ while(fileRemain > fileChunkSize)
 						end
 					end
 					
-					% check for too small values
+					% check for too small H
 					rms_H = sqrt( abs( H_syms*H_syms' )/length(H_syms) );
-					equalizer.eps_abs_h = max( rms_H/20, MIN_ABS_H );	%quick and dirty fixed settings
+					equalizer.eps_abs_h = max( rms_H/20, MIN_ABS_H );
 					H_too_small_index = find( abs(H_syms)<equalizer.eps_abs_h );
 					H_syms( H_too_small_index ) = equalizer.eps_abs_h;
 
@@ -350,9 +351,10 @@ while(fileRemain > fileChunkSize)
 					end
 					if 1
 						if show_H
+							max_H_plot = ceil(max(max_H_plot, max(abs(H_raw(2:2:N)))));
 							H_raw(1:2:N) = H_raw(2:2:N);
 							subplot(3, 1, 1)
-							plot(carriers, abs(H_raw(carrier_indexes)), 'b-', carriers, abs(H_syms), 'r-'); grid; title('abs(H_{syms})'); axis([ofdm_spec_occ.kmin ofdm_spec_occ.kmax 0 15+0*max(abs(H_syms))]); title(str);
+							plot(carriers, abs(H_raw(carrier_indexes)), 'b-', carriers, abs(H_syms), 'r-'); grid; title('abs(H_{syms})'); axis([ofdm_spec_occ.kmin ofdm_spec_occ.kmax 0 max_H_plot]); title(str);
 							subplot(3, 1, 2)
 							plot(carriers, angle(H_raw(carrier_indexes)), 'b-', carriers, angle(H_syms), 'r-'); grid; title('phi(H_{syms})'); axis([ofdm_spec_occ.kmin ofdm_spec_occ.kmax -4 4]); title(str);
 							subplot(3, 1, 3)