diff --git a/radiospectra/spectrogram2/spectrogram.py b/radiospectra/spectrogram2/spectrogram.py
index 1ad504b..a4515ea 100644
--- a/radiospectra/spectrogram2/spectrogram.py
+++ b/radiospectra/spectrogram2/spectrogram.py
@@ -631,28 +631,7 @@ def _read_cdf(file):
     def _read_fits(file):
         hd_pairs = fits.read(file)
 
-        if 'e-CALLISTO' in hd_pairs[0].header.get('CONTENT', ''):
-            data = hd_pairs[0].data
-            times = hd_pairs[1].data['TIME'].flatten() * u.s
-            freqs = hd_pairs[1].data['FREQUENCY'].flatten() * u.MHz
-            start_time = parse_time(hd_pairs[0].header['DATE-OBS']
-                                    + ' ' + hd_pairs[0].header['TIME-OBS'])
-            end_time = parse_time(hd_pairs[0].header['DATE-END']
-                                  + ' ' + hd_pairs[0].header['TIME-END'])
-            times = start_time + times
-            meta = {
-                'fits_meta': hd_pairs[0].header,
-                'detector': 'e-CALLISTO',
-                'instrument': 'e-CALLISTO',
-                'observatory': hd_pairs[0].header['INSTRUME'],
-                'start_time': start_time,
-                'end_time': end_time,
-                'wavelength': a.Wavelength(freqs.min(), freqs.max()),
-                'times': times,
-                'freqs': freqs
-            }
-            return data, meta
-        elif hd_pairs[0].header.get('TELESCOP', '') == 'EOVSA':
+        if hd_pairs[0].header.get('TELESCOP', '') == 'EOVSA':
             times = Time(hd_pairs[2].data['mjd'] + hd_pairs[2].data['time'] / 1000.0 / 86400.,
                          format='mjd')
             freqs = hd_pairs[1].data['sfreq'] * u.GHz
@@ -673,6 +652,35 @@ def _read_fits(file):
             }
             return data, meta
 
+        # semi standard - spec in primary and time and freq in 1st extension
+        try:
+            data = hd_pairs[0].data
+            times = hd_pairs[1].data['TIME'].flatten() * u.s
+            freqs = hd_pairs[1].data['FREQUENCY'].flatten() * u.MHz
+            start_time = parse_time(hd_pairs[0].header['DATE-OBS']
+                                    + ' ' + hd_pairs[0].header['TIME-OBS'])
+            end_time = parse_time(hd_pairs[0].header['DATE-END']
+                                  + ' ' + hd_pairs[0].header['TIME-END'])
+            times = start_time + times
+            meta = {
+                'fits_meta': hd_pairs[0].header,
+                'start_time': start_time,
+                'end_time': end_time,
+                'wavelength': a.Wavelength(freqs.min(), freqs.max()),
+                'times': times,
+                'freqs': freqs,
+                'instrument': hd_pairs[0].header.get('INSTRUME', ''),
+                'observatory': hd_pairs[0].header.get('INSTRUME', ''),
+                'detector': hd_pairs[0].header.get('DETECTOR', ''),
+            }
+            if 'e-CALLISTO' in hd_pairs[0].header['CONTENT']:
+                meta['detector'] = 'e-CALLISTO'
+                meta['instrument'] = 'e-CALLISTO'
+
+            return data, meta
+        except KeyError:
+            raise ValueError('Could not load fits file into spectrogram')
+
     @staticmethod
     def _read_idl_sav(file, instrument=None):
         data = readsav(file)