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Galaxy DX Radios
Model DX45MP
Chassis EPT6900-10C
Symptom Excessive noise or whistling type noise on receive when NB/ANL is on. This problem is caused by the wiring harness that runs from J6 on the main pcb to J204 on the channel selector pcb. When this wire harness is tucked in with the wires from the echo board you will hear excessive static on the receiver when the NB/ANL is turned on.
Cure To fix this problem cut the three wire harness from J6 to J204 and shorten the wires by removing 4 inches. The problem is caused by the oscillator in the echo board inducing noise on the wires going to the NB and ANL circuits in the receiver.
Additional Comments To test for this problem setup the radio for AM receive on 26.965mhz with the signal generator set to about 1.0uv. and turn the NB/ANL to the on position. Wait about 10-15 minutes and while listening to the receiver use a non metallic tuning instrument and slightly touch any of the three wires at J6 and you will hear the increase in static. Turning the NB/ANL switch to off will make this noise go away.
Category RX
Posted By Galaxy Tech Support
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Galaxy DX Radios
Model DX48T
Chassis EPT6900-10C
Symptom Excessive short wave radio noise or whistling type noise on receive. To test for this problem setup the radio for AM receive on 26.965mhz with the signal generator set to about 1.0uv. and turn the NB/ANL to the on position. Wait about 10-15 minutes and while listening to the receiver use a non metallic tuning instrument and slightly touch any of the three wires at J6 and you will hear the increase in static. Turning the NB/ANL switch to off will make this noise go away.
Cure To fix this problem cut the three wire harness from J6 to J204 and shortening the wires by removing 4 inches. The problem is caused by the step-up transformer in the EL lighting pc board inducing noise on the wires going to the NB and ANL circuits in the receiver.
Additional Comments If you don't want to cut the wires you can do this:
1. Remove the 5 screws of the bottom speaker cover.
2. With the knobs of the radio facing your chest, flip the bottom cover over on it's side.
3. Carefully cut all the cable straps along the front wiring harness along the front chrome bezel.
4. Locate connector J6 on the main pcb and re-route the three wires (green/yellow/orange) away from behind the s-meter.
5. Twist the excess wires at the left end of the harness and fold over.
6. Install new cable ties.
Category RX
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Make Galaxy DX Radios
Model See text for Model
Chassis EPT6900-10C
Symptom Models DX93T and DX95T.
Excessive white noise on RX.
Cure Disconnect the antenna from the radio. Locate L8 on the main pcb and adjust it from 1/4 to 1/2 turn clockwise or until the white noise (static) drops to your satisfaction. Be care not to adjust too far or you will lose some receive range.
Additional Comments
Category RX
Posted By Galaxy Tech Support
