DANIELS
ELECTRONICS LTD.
TM
VHF Enhanced Extra Wideband Receiver Instruction Manual IM10-VR3H040-AB
5-1
5
RECEIVER CONFIGURATION AND TEST POINTS
5.1
21.4 MHz IF / Audio Main Board Factory Settings
5.1.1
The 21.4 MHz IF/Audio Main Board Configuration:
• Audio de-emphasis response enabled (JU14).
• Flat audio response enabled (JU11).
•
600
Ω
balanced de-emphasis high level drive (JU17, JU18, JU22 and JU35 [Narrow Band
Only]).
• Noise based squelch (JU30).
• Squelch Override precedence (JU40).
5.1.2
The 21.4 MHz IF/Audio Main Board Configuration Jumper Settings
• Jumper JU1:
installed
Mixer bypass (mixer installed for older Front Ends only)
• Jumper JU2:
installed
Installed if L3 is not a transformer
• Jumper JU3:
installed
IF output disconnect (for testing purposes)
• Jumper JU4:
installed
Demod input disconnect (for testing purposes)
• Jumper JU5:
not installed
AC / DC couple amplified discriminator output
• Jumper JU6:
not installed
Subtone filter input enable
• Jumper JU7:
not installed
Subtone filter power enable
• Jumper JU8:
not installed
Voice band 9.5 Vdc power enable
• Jumper JU9:
not installed
Voice band 4.75 Vdc power enable
• Jumper JU10:
not installed
Unfiltered audio voice band filter input select
• Jumper JU11:
installed
Unfiltered flat audio select
• Jumper JU12:
not installed
Voice band filtered flat audio select
• Jumper JU13:
not installed
De-emphasized audio voice band filter input select
• Jumper JU14:
installed
De-emphasized audio select
• Jumper JU15:
not installed
Voice band filtered De-emphasized audio input select
• Jumper JU16:
not installed
Flat audio high level drive select
• Jumper JU17:
installed
De-emphasized audio high level drive select
• Jumper JU18:
installed
High level drive power enable
• Jumper JU19:
not installed
Auxiliary speaker output
• Jumper JU20:
not installed
Balanced audio, low level de-emphasized audio select
• Jumper JU21:
not installed
Balanced audio bypass
• Jumper JU22:
installed
Balanced audio, high level drive select
• Jumper JU23:
not installed
Balanced audio, low level flat audio select
• Jumper JU24:
not installed
Unbalanced audio output enable
• Jumper JU25:
not installed
Direct discriminator output enable