home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
World of Ham Radio 1997
/
WOHR97_AmSoft_(1997-02-01).iso
/
mods
/
radioshk
/
pro2006a.doc
< prev
next >
Wrap
Text File
|
1997-02-01
|
2KB
|
58 lines
PRO2006.1
Radio Shack PRO-2006 Scanner Mods
by Mark A. Day N4OQK @ CHO
Introduction
The PRO-2006 is probably the worlds most versatile scanner to date.
Modifications are easily implemented, and upgrade performance over stock
units tremendously. Enjoy, and keep scanning!
Mod#1 : Cellular restoration
Parts : NONE
To restore the missing CMT frequencies, merely clip diode D502.
It is located in the upper left corner of the CPU/display board.
Mod#2 : Scan rate increase
Parts : 16Mhz. Quartz Crystal - fundamental cut
Replace CX503 (12Mhz) with a 16Mhz crystal, clip diode D503 (near D502)
The unit now scans at around 40 channels per second.
Mod#3 : Squelch hysteresis suppression
Parts : 100-200K ohm 1/8w resistor
Locate R152 (33K) on the linear PCB (main board). This is a tricky
resistor to get to, since it is on the bottom side of the board.
Remove this resistor, and replace it with a 100-200K resistor. The
higher the resistance, the less hysteresis will be present. I found
100K gave me all the razor-sharpness I was looking for, without
sacrificing performance.
Mod#4 : "S" meter output
Parts : 10Kohm 1/8w resistor, 0.1 uf capacitor
Locate D33 on the linear PCB. Solder in the 10K resistor to the ANODE
of this diode. Note this is not the same as TP2. Connect a wire from
the free end of this resistor to a rear panel jack (RCA). Solder the
0.1uf capacitor from the jack's center terminal to ground. Output on
this jack follows the AGC voltage. Negative for no signal, goes
positive when a signal is present, increasing with signal strength.
A 1Volt full scale panel meter makes a good "S" meter
Mod#5 : Increased headphone audio
Parts : NONE
Locate resistor R228 (27 ohm) on linear board (near IC7).
Remove this resistor and replace it with a jumper wire.