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Galaxy DX 2547 Channel Mod
This is the channel mod sheet that is circulating. You can find the same one on http://www.cbtricks.com/ .
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CB World Informer
Before you start, make sure the radio isn't connected to a power source!
This is a 4 position rotary switch
conversion
Exclusive 4 Position Channel Mod
Reference Picture Below
Remove the radio covers, all knobs,
and front bezel.
Remove the headphone jack from the
front panel and leave wired.
Heat shrink headphone jack and
secure to inside of chassis with
double sided mounting foam. (See
Figure 2)
Turn the shaft of the rotary switch to
position 2.
Mount the switch in the hole for the
headphone jack and position the flat
side of the shaft toward the bottom of
the radio.
Wire according to the schematic to
the left and reassemble the radio.
Figure 1
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Figure 2
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Channel Position 1 Position 2 Position 3 Position 4
1 1
2 2
3 3
4 4
5 26.695 5 27.655
6 26.705 6 27.665
7 26.715 7 27.675
8 26.735 8 27.695
9 26.745 9 27.705
10 26.755 10 27.715
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11 26.765 11 27.725
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12 26.785 12 27.425 27.745
13 26.795 13 27.435 27.755
14 26.805 14 27.445 27.765
15 26.815 15 27.455 27.775
16 26.835 16 27.475 27.795
17 26.845 17 27.485 27.805
18 26.855 18 27.495 27.815
19 26.865 19 27.505 27.825
20 26.885 20 27.505 27.845
21 26.895 21 27.515 27.855
22 26.905 22 27.525 27.865
23 26.935 23 27.575 27.895
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24 26.915 24 27.555 27.875
25 26.925 25 27.565 27.885
26 26.945 26 27.585 27.905
27 26.955 27 27.595 27.915
28 28 27.605 27.925
29 29 27.615 27.935
30 30 27.625 27.945
31 31 27.635 27.955
32 32 27.645 27.965
33 33
34 34
35 35
36 36
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37 37
38 38
39 39
40 40
CBWI
©
The 4 position wired rotary switch with matching knob and instructions is available from
Bob's CB & Wireless.
1-800-473-9708
Back To Cover Page
© 1996 - 2002 Worldwide Rights Reserved
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July 2001 Web Edition
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Galaxy DX 2547 Clarifier Mod
Most operators that use sideband have unlocked clarifiers. Unlocking the clarifier means that the clarifier will change both the transmitter frequency as
well as the receiver frequency. They will track together when this is done properly. There are many benefits to having this modification done. First,
two operators having a conversation on sideband with unlocked clarifiers that are tuned to one another can be heard by others without having to retune
on every transmission. Second, it two operators are unlocked, only one need tune to the other and they are both transmitting on the same frequency.
Third, if the clarifier is unlocked and expanded, all the above is true and then the radio can tune between channels or even slide a full channel,
depending on the radio's capabilities.
To unlock and expand the clarifier do the following:
1.
Make sure the radio isn't connected to a power source.
2.
Remove D68 a 1N4148 diode. (Fig. 1)
3.
Remove R113 a 47 ohm resistor. (Fig. 1)
4.
Remove R153 a 2.7K resistor. (Fig. 2)
5.
Jumper D38 a 1N4148 diode with a jumper wire. (Fig. 1)
6.
Jumper R114 a 2.2K resistor with a jumper wire. (Fig. 1)
7.
Run a wire from 8 volts constant to J9 pin F1. (Fig. 1)
Triple check your work before applying power to the radio. Once you're certain that everything has been properly changed, plug in the radio
and turn it on for 15 to 20 minutes and proceed to the alignment step.
Figure 1
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Figure 2
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Now the radio needs to be put back to center slot. With the clarifier switch in the
ITEM UNIT UNDER TEST SETTING
Set the radio to CH 1 AM RX
AM Frequency
USB
Frequency
LSB
Frequency
mode.
Connect frequency counter to TP3.
Set the radio to CH 1 USB RX
mode.
Connect frequency counter to TP3.
Set the radio to CH 1 LSB RX
mode.
Connect frequency counter to TP3.
position, adjust the following.
OFF
ADJUST
POINT
L20 16.2700MHz ± 20Hz
L21 16.2725MHz ± 20Hz
L22 16.2675MHz ± 20Hz
MEASUREMENT
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Turn the clarifier ON and verify, with the clarifier at the 12 0'clock position, that the radio is on center slot. 26.9650. The clarifier will shift the
transmitter and receiver frequency at least
becomes more sensitive once this modification has been made. Much to my surprise, it wasn't to difficult to tune in 5KHz down. Also, once you have
set the clarifier down 5KHz, to go back up 5Khz, just switch the clarifier off. ©
+ 2.4KHz and - 6.3KHz.
This makes it easy to pick up those operators on even frequencies. The clarifier
CBWI
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