DANIELS
ELECTRONICS LTD.
TM
5-2
IM10-VR3H040-AB VHF Enhanced Extra Wideband Receiver Instruction Manual
• Jumper JU26:
not installed
+6.0 Vdc COR pull-up
• Jumper JU27:
not installed
+9.5 Vdc COR pull-up
• Jumper JU28:
not installed
Opto-isolated COR enable
• Jumper JU29:
not installed
Relay COR enable
• Jumper JU30:
installed
Noise based squelch select
• Jumper JU31:
not installed
Signal strength squelch select
• Jumper JU32:
not installed
Squelch override zener diode bypass
• Jumper JU33:
not installed
Mute zener diode bypass
• Jumper JU34:
installed
OS-3 synthesizer mute control enable
• Jumper JU35:
installed
High level drive gain select (Narrow Band)
• Jumper JU35:
not installed
High level drive gain select (Wide Band)
• Jumper JU36:
installed
Fuse bypass
• Jumper JU37:
installed
Amplified Discriminator output enable
• Jumper JU38:
not installed
LPF discriminator output to Discriminator output routing
•Jumper JU39:
not installed
+6.0 / +9.5 Vdc Priority COR pull-up select
• Jumper JU40:
installed
Squelch override precedence enable
• Jumper JU41:
not installed
45 MHz IF narrow band matching
• Jumper JU42:
not installed
Installed for 45 MHz only
• Jumper JU43:
not installed
Squelched discriminator audio ENA
• Jumper JU44:
not installed
Squelched discriminator audio ENB
5.1.3
Test Points
TP1
+6.0 Vdc ± 0.1 Vdc. U1 positive regulator output.
TP2
-6.0 Vdc ± 0.1 Vdc. U12 negative regulator output.
TP3
+4.75 Vdc ± 0.1 Vdc. Virtual ground reference source.
TP4
21.4 MHz IF injection point.
TP5
+8.75 Vdc ± 0.1 Vdc. MOSFET Q1 operating point.
TP6
Second IF sample input / output.
TP7
455 kHz Filter input / second mixer output.
TP8
RSSI output. + 1.0 Vdc to +5.0 Vdc depending on received signal strength.
TP9
Unfiltered, recovered audio.
≈
200 mV pk-pk with standard input signal applied.
TP10 COR internal logic line.
≈
-5.7 Vdc squelched,
≈
+8.5 Vdc unsquelched.
TP11 Squelch noise temperature compensated amplifier output.
TP12 Squelch noise power level. 0.0 to +1.5 Vdc (depending on signal strength).
TP13 +2.50 Vdc ± 0.02 Vdc. U15 squelch threshold reference.