Nokia RH-3 Series Guide

CCS Technical Documentation
RH-3 Series Transceivers
Issue 1 06/2003 Confidential Nokia Corporation
Troubleshooting — Antenna

RH-3
Troubleshooting — Antenna CCS Technical Documentation
Page 2 Nokia Corporation Confidential Issue 1 06/2003

CCS Technical Documentation Troubleshooting — Antenna
RH-3
Issue 1 06/2003 Nokia Corporation Confidential Page 3
Contents Page No
Troubleshooting - Antenna ............................................................................................ 5
Whip Antenna ..............................................................................................................5
Visual Quality Requirements.................................................................................... 5
PIFA Antenna ..............................................................................................................6
Visual Quality Requirements.................................................................................... 6
Failures and Corrective Measures.................................................................................. 8
Appearance of Phone ...................................................................................................8
Antenna Position into D-cover.................................................................................. 8
Internal Antenna ..........................................................................................................9
Damaged RF Feed or Ground Pins ........................................................................... 9
Wrong Internal Antenna Installed........................................................................... 10
Obstructed RF Feed and/or Ground Pads for the Main and GPS Antennas ........... 11
Broken or Missing Bottom Antenna Clip ............................................................... 12
Obstructed Whip Stopper........................................................................................ 12
Grounding of Display Frame................................................................................... 13
Misinstalled Whip................................................................................................... 14
Damaged Whips...................................................................................................... 15
Detuning Circuit for Bottom Antenna Clip............................................................. 15
Testing CDMA Antenna.............................................................................................. 15
Calibration Factors.................................................................................................. 15
Calibration Factor for Cell800 frequency ............................................................... 15
Measurement Procedure for Cell800/PCS1900 phones.......................................... 15
Testing GPS Antenna................................................................................................... 16
Calibration Factor for GPS...................................................................................... 16
Measurement Procedure for GPS Antenna ............................................................. 16

RH-3
Troubleshooting — Antenna CCS Technical Documentation
Page 4 Nokia Corporation Confidential Issue 1 06/2003

CCS Technical Documentation Troubleshooting — Antenna
RH-3
Issue 1 06/2003 Nokia Corporation Confidential Page 5
Troubleshooting - Antenna
This troubleshooting guide addresses potential failures that will affect antenna perfor-
mance of the RH-3/RH-3P phone, and discusses methods for correction of these failures.
Whip Antenna
Visual Quality Requirements
Following are the minimum acceptable visual quality standards of the RH-3/RH-3P whip
assembly. This information may be used as an inspection guideline.
• No physical crack or any mechanical defects.
• No oil, dirt or particles are presented on parts.
• Button parting line (flash or offset) less than 0.1 mm.
• Color match to code Nokia Jonathan Gray (GY7999).
• Wire tube must completely cover the NiTi wire. No uncovered NiTi wire
can be seen from the tube side.
• No wire burr greater than 0.1 mm can be seen from the stopper.
• Check if the proper printing is present (can be found on the plastic cap).
• The button must be perpendicular to the tube. This can be interpreted
as maximum of 5°.
Figure 1: Whip Assembly
No wire burr greater than
0.1 mm can be seen
outside of the stopper.
Button
Button
Wire
Cap
Tube

RH-3
Troubleshooting — Antenna CCS Technical Documentation
Page 6 Nokia Corporation Confidential Issue 1 06/2003
Figure 2: Whip Assembly
PIFA Antenna
Visual Quality Requirements
Following are the minimum acceptable visual quality standards of the RH-3/RH-3P PIFA
antenna assembly. This information may be used as an inspection guideline.
• Gloves must be used when handling antennas. Do not touch radiator
with bare hands.
• Maximum burrs of any metal part must be less than 0.01 mm, except for
burrs on radiator resulted by antenna tuning.
• General parting lines, or flash lines (including gate) must be less than
0.20 mm.
• No visual crack or any mechanical defects.
• Proper marking must present.
• No oil, dirt, or particles are present on parts.
• Radiator must be aligned with plastic housing.
• GPS antenna contacts must be inside the plastic housing.
• Radiator must be flat and no warp.
Parting line (flash or
offset) must be less than
0.1 mm.
Check the part printing.
Button must be perpendicular to the tube

CCS Technical Documentation Troubleshooting — Antenna
RH-3
Issue 1 06/2003 Nokia Corporation Confidential Page 7
• All pins must be at same level.
• Check if proper printing is present.
Figure 3: PIFA Module showing antenna feed pins
Figure 4: PIFA Actual Element
Pins must be at
the same level.
Proper printing must be present. (See Figure 10).

RH-3
Troubleshooting — Antenna CCS Technical Documentation
Page 8 Nokia Corporation Confidential Issue 1 06/2003
Failures and Corrective Measures
Appearance of Phone
Figure 5: Front of RH-3/RH-3P handset
Figure 6: Back of RH-3/RH-3P phone, whip retracted and whip extended
Note in Figure 6 that when the whip is properly installed that the cap clicks into the
D-cover when the whip is fully retracted.
Antenna Position into D-cover
Internal antenna and whip are assembled into D-cover as shown in Figure 7. Whip must
be inserted prior to inserting internal antenna

CCS Technical Documentation Troubleshooting — Antenna
RH-3
Issue 1 06/2003 Nokia Corporation Confidential Page 9
.
Figure 7: RH-3 D-cover assembly
If the internal antenna is missing, install one. If the radiator looks obviously damaged,
then replace the internal antenna.
If no internal antenna is installed, the antenna gain will be degraded by more than
25 dB.
If the whip is missing, then remove the internal antenna, install a whip and reinstall the
internal antenna.
Internal Antenna
RH-3/RH-3P internal antenna shown in Figure 8 has a metal sheet (main antenna radia-
tor) and a metal strip (GPS antenna) attached to a plastic carrier (Models 2285 and 2270
only).
Figure 8: RH-3/RH-3P internal antenna from two different view angles
Damaged RF Feed or Ground Pins
Both main and GPS antennas have pins (spring clips) that should properly touch the
PWB. Positioning of these pins is shown in Figure 9.

RH-3
Troubleshooting — Antenna CCS Technical Documentation
Page 10 Nokia Corporation Confidential Issue 1 06/2003
Figure 9: Back view of RH-3/RH-3P internal antenna
If either the RF feed pin or ground pin are broken, or bent such that either pin will not
touch the PWB, then the internal antenna must be replaced. If the springs for the RF or
ground pin appear damaged, then the internal antenna must be replaced.
If the RF feed pin of main antenna doesn't touch the PWB, then the antenna gain will
degrade by more than 25 dB and GPS antenna will be detuned. If the ground pin of main
antenna doesn't touch the PWB then the antenna gain may degrade about 5 to 10 dB
and GPS antenna will be detuned.
If the RF feed pin of GPS antenna doesn't touch the PWB, then the GPS antenna gain will
degrade by more than 20dB. If the ground pin of GPS antenna doesn't touch the PWB,
then the GPS antenna gain may degrade more than 5dB.
Wrong Internal Antenna Installed
The RH-3/RH-3P and RH-17 antennas share the same mechanical interface with the
D-cover. So either antenna can be installed in either phone. However, there are three
important differences between RH-3/RH-3P and RH-17 internal antennas:
1 Models 2285 and 2270 RH-3/RH-3P antenna have a GPS strip (antenna) while
the RH-17 antenna does not
2 The slot pattern is very different between the two antennas; and
3 RH-3/RH-3P and RH-17 antennas are marked on their radiators with "F" and "H"
respectively. See Figure 10.