diff --git a/db/base/migrations/0020_auto_20200802_1804.py b/db/base/migrations/0020_auto_20200802_1804.py
new file mode 100644
index 0000000..e34dbfc
--- /dev/null
+++ b/db/base/migrations/0020_auto_20200802_1804.py
@@ -0,0 +1,106 @@
+# Generated by Django 2.2.14 on 2020-08-02 18:04
+
+import django.core.validators
+from django.db import migrations, models
+import django.db.models.deletion
+import django.utils.timezone
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('base', '0019_satellite_details'),
+    ]
+
+    operations = [
+        migrations.AlterField(
+            model_name='operator',
+            name='website',
+            field=models.URLField(blank=True, validators=[django.core.validators.URLValidator(regex="(?:http(s)?:\\/\\/)?[\\w.-]+(?:\\.[\\w\\.-]+)+[\\w\\-\\._~:/?#[\\]@!\\$&'\\(\\)\\*\\+,;=.]+$", schemes=['http', 'https'])]),
+        ),
+        migrations.AlterField(
+            model_name='satellite',
+            name='dashboard_url',
+            field=models.URLField(blank=True, null=True, validators=[django.core.validators.URLValidator(regex="(?:http(s)?:\\/\\/)?[\\w.-]+(?:\\.[\\w\\.-]+)+[\\w\\-\\._~:/?#[\\]@!\\$&'\\(\\)\\*\\+,;=.]+$", schemes=['http', 'https'])]),
+        ),
+        migrations.AlterField(
+            model_name='satellite',
+            name='website',
+            field=models.URLField(blank=True, validators=[django.core.validators.URLValidator(regex="(?:http(s)?:\\/\\/)?[\\w.-]+(?:\\.[\\w\\.-]+)+[\\w\\-\\._~:/?#[\\]@!\\$&'\\(\\)\\*\\+,;=.]+$", schemes=['http', 'https'])]),
+        ),
+        migrations.AlterField(
+            model_name='transmitterentry',
+            name='baud',
+            field=models.FloatField(blank=True, help_text='The number of modulated symbols that the transmitter sends every second', null=True, validators=[django.core.validators.MinValueValidator(0)]),
+        ),
+        migrations.AlterField(
+            model_name='transmitterentry',
+            name='citation',
+            field=models.CharField(default='CITATION NEEDED - https://xkcd.com/285/', help_text='A reference (preferrably URL) for this entry or edit', max_length=512),
+        ),
+        migrations.AlterField(
+            model_name='transmitterentry',
+            name='created',
+            field=models.DateTimeField(default=django.utils.timezone.now, help_text='Timestamp for this entry or edit'),
+        ),
+        migrations.AlterField(
+            model_name='transmitterentry',
+            name='description',
+            field=models.TextField(help_text='Short description for this entry, like: UHF 9k6 AFSK Telemetry'),
+        ),
+        migrations.AlterField(
+            model_name='transmitterentry',
+            name='downlink_drift',
+            field=models.IntegerField(blank=True, help_text='Transmitter drift from the published downlink frequency, stored in             parts per billion (PPB)', null=True, validators=[django.core.validators.MinValueValidator(-99999), django.core.validators.MaxValueValidator(99999)]),
+        ),
+        migrations.AlterField(
+            model_name='transmitterentry',
+            name='downlink_high',
+            field=models.BigIntegerField(blank=True, help_text='Frequency (in Hz) for the top of the downlink range for a transponder', null=True, validators=[django.core.validators.MinValueValidator(0, message='Ensure this value is greater than or equal to 0Hz'), django.core.validators.MaxValueValidator(40000000000, message='Ensure this value is less than or equal to 40Ghz')]),
+        ),
+        migrations.AlterField(
+            model_name='transmitterentry',
+            name='downlink_low',
+            field=models.BigIntegerField(blank=True, help_text='Frequency (in Hz) for the downlink, or bottom of the downlink range             for a transponder', null=True, validators=[django.core.validators.MinValueValidator(0, message='Ensure this value is greater than or equal to 0Hz'), django.core.validators.MaxValueValidator(40000000000, message='Ensure this value is less than or equal to 40Ghz')]),
+        ),
+        migrations.AlterField(
+            model_name='transmitterentry',
+            name='downlink_mode',
+            field=models.ForeignKey(blank=True, help_text='Modulation mode for the downlink', null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='transmitter_downlink_entries', to='base.Mode'),
+        ),
+        migrations.AlterField(
+            model_name='transmitterentry',
+            name='invert',
+            field=models.BooleanField(default=False, help_text='True if this is an inverted transponder'),
+        ),
+        migrations.AlterField(
+            model_name='transmitterentry',
+            name='service',
+            field=models.CharField(choices=[('Aeronautical', 'Aeronautical'), ('Amateur', 'Amateur'), ('Broadcasting', 'Broadcasting'), ('Earth Exploration', 'Earth Exploration'), ('Fixed', 'Fixed'), ('Inter-satellite', 'Inter-satellite'), ('Maritime', 'Maritime'), ('Meteorological', 'Meteorological'), ('Mobile', 'Mobile'), ('Radiolocation', 'Radiolocation'), ('Radionavigational', 'Radionavigational'), ('Space Operation', 'Space Operation'), ('Space Research', 'Space Research'), ('Standard Frequency and Time Signal', 'Standard Frequency and Time Signal'), ('Unknown', 'Unknown')], default='Unknown', help_text='The published usage category for this transmitter', max_length=34),
+        ),
+        migrations.AlterField(
+            model_name='transmitterentry',
+            name='status',
+            field=models.CharField(choices=[('active', 'active'), ('inactive', 'inactive'), ('invalid', 'invalid')], default='active', help_text='Functional state of this transmitter', max_length=8),
+        ),
+        migrations.AlterField(
+            model_name='transmitterentry',
+            name='uplink_drift',
+            field=models.IntegerField(blank=True, help_text='Receiver drift from the published uplink frequency, stored in parts             per billion (PPB)', null=True, validators=[django.core.validators.MinValueValidator(-99999), django.core.validators.MaxValueValidator(99999)]),
+        ),
+        migrations.AlterField(
+            model_name='transmitterentry',
+            name='uplink_high',
+            field=models.BigIntegerField(blank=True, help_text='Frequency (in Hz) for the top of the uplink range for a transponder', null=True, validators=[django.core.validators.MinValueValidator(0, message='Ensure this value is greater than or equal to 0Hz'), django.core.validators.MaxValueValidator(40000000000, message='Ensure this value is less than or equal to 40Ghz')]),
+        ),
+        migrations.AlterField(
+            model_name='transmitterentry',
+            name='uplink_low',
+            field=models.BigIntegerField(blank=True, help_text='Frequency (in Hz) for the uplink, or bottom of the uplink range for a             transponder', null=True, validators=[django.core.validators.MinValueValidator(0, message='Ensure this value is greater than or equal to 0Hz'), django.core.validators.MaxValueValidator(40000000000, message='Ensure this value is less than or equal to 40Ghz')]),
+        ),
+        migrations.AlterField(
+            model_name='transmitterentry',
+            name='uplink_mode',
+            field=models.ForeignKey(blank=True, help_text='Modulation mode for the uplink', null=True, on_delete=django.db.models.deletion.SET_NULL, related_name='transmitter_uplink_entries', to='base.Mode'),
+        ),
+    ]
diff --git a/db/base/models.py b/db/base/models.py
index 3d97c20..3f3c8b3 100644
--- a/db/base/models.py
+++ b/db/base/models.py
@@ -32,9 +32,9 @@ SERVICE_TYPE = [
     'Space Operation', 'Space Research', 'Standard Frequency and Time Signal', 'Unknown'
 ]
 URL_REGEX = r"(?:http(s)?:\/\/)?[\w.-]+(?:\.[\w\.-]+)+[\w\-\._~:/?#[\]@!\$&'\(\)\*\+,;=.]+$"
-MIN_FREQ = 130000000
+MIN_FREQ = 0
 MAX_FREQ = 40000000000
-MIN_FREQ_MSG = "Ensure this value is greater than or equal to 130Mhz"
+MIN_FREQ_MSG = "Ensure this value is greater than or equal to 0Hz"
 MAX_FREQ_MSG = "Ensure this value is less than or equal to 40Ghz"