ENR 4  RADIO NAVIGATION AIDS/SYSTEMS

ENR 4.1  RADIO NAVIGATION AIDS - EN-ROUTE

Name of station (VOR/VAR)IdFrequency (CH)Hours of operationCo-ordinatesELEV DME antennaRemarks
1234567
BANGKOK

DVOR/DME

 BKK

117.7 MHZ

(CH 124X)

H24

135336.8N

1003546.3E

16.58 M

DVOR/DME restriction due to obstacles surround DVOR/DME station, coverage check does not provide adequate signal 40 NM at required altitude in various areas as follows:

  1. Radial 321°-030° altitude should not below 2 500 FT

  2. Radial 031°-060° altitude should not below 4 000 FT

  3. Radial 061°-120° altitude should not below 3 000 FT

  4. Radial 121°-320° altitude should not below 4 000 FT

BETONG

DVOR/DME

BET

113.1 MHZ

(CH 78X)

H24

054707.68N

1010838.65E

DVOR/DME restrictions,

  1. Due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal to 40 NM at required altitude and distance in various areas as follows:

    1. Radial 350°-020° altitude should not below 8 000 FT

    2. Radial 021°-040° altitude should not below 6 500 FT

    3. Radial 041°-060° altitude should not below 9 000 FT

    4. Radial 061°-075° altitude should not below 15 000 FT

    5. Radial 076°-349° unable to check due to border limit

  2. Due to the out-of-tolerance 30Hz FM deviation ratio in the following areas:

    1. Radial 130°-180°

    1. Radial 320°-010°

BURI RAM

DVOR/DME

 BRM

117.2 MHZ

(CH 119X)

H24

151422.43N

1031531.59E

-

DVOR/DME restriction due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal clockwise orbit 40 NM at required altitude in various areas as follows:

  1. Radial 091°-140° altitude should not below 3 500 FT

  2. Radial 141°-240° altitude should not below 5 000 FT

  3. Radial 241°-280° altitude should not below 4 000 FT

  4. Radial 281°-090° altitude should not below 2 500 FT

CHIANG MAI

DVOR/DME

 CMA

116.9 MHZ

(CH 116X)

H24

184558.06N

0985740.38E

318 M

DVOR/DME restriction due to mountainous terrain surround station coverage check does not provide adequate signal at required altitudes in various areas as follows:

  1. Beyond 40 NM

    1. Radial 350º-080º altitude should not below 8 000 FT

    2. Radial 081º-180º altitude should not below 7 000 FT

    3. Radial 181º-240º altitude should not below 9 000 FT

  2. Beyond 20 NM

    1. Radial 241º-349º altitude should not below 12 000 FT

CHIANG RAI

DVOR/DME

 CTR

116.5 MHZ

(CH 112X)

H24

195653.65N

0995300.12E

-

DVOR/DME restriction due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal at the required altitude in various areas as follows:

  1. 40 NM

    1. Radial 141º-180º altitude should not below 5 000 FT

    2. Radial 181º-210º altitude should not below 7 500 FT

    3. Radial 211º-255º altitude should not below 9 000 FT

    4. Radial 256º-265º altitude should not below 10 000 FT

    5. Radial 266º-270º altitude should not below 9 000 FT

  2. 20 NM (Due to border limited)

    1. Radial 271º-340º altitude should not below 6 500 FT

    2. Radial 341º-140º altitude should not below 5 000 FT

CHUM PHAE

DVOR/DME

 CMP

112.9 MHZ

(CH 76X)

163811.3N

1015905.4E

-

DVOR/DME restrictions,

  1. Due to mountainous terrain surround DVOR/DME station, during radial check found roughness and bends out of tolerance, DVOR/DME unusable on radial as follows:

    1. Radial 102° distance between 9.5-10.5 DME at altitude 4 500 FT

    2. Radial 223º distance between 11.0-12.0 DME at altitude 5 000 FT

    3. Radial 273º distance between 13.0-14.0 DME at altitude 6 000 FT

    4. Radial 343º distance between 6.0-8.5 DME at altitude 5 500 FT

  2. Due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal to 40 NM at required altitudes and distances in various areas as follows:

    1. Radial 001º-010º altitude should not below 5 500 FT

    2. Radial 011º-080º altitude should not below 4 500 FT

    3. Radial 081º-105º altitude should not below 7 000 FT

    4. Radial 106º-120º altitude should not below 6 000 FT

    5. Radial 121º-190º altitude should not below 5 000 FT

    6. Radial 191º-230º altitude should not below 6 000 FT

    7. Radial 231º-260º altitude should not below 8 000 FT

    8. Radial 261º-310º altitude should not below 7 000 FT

    9. Radial 311º-330º altitude should not below 8 000 FT

    10. Radial 331º-350º altitude should not below 5 500 FT

    11. Radial 351º-360º altitude should not below 6 500 FT

CHUM PHON

DVOR/DME

 CPN

110 MHZ

(CH 37X)

H24

104240.21N

0992156.03E

5.50 M

(18 FT)

DVOR/DME restriction, due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal clockwise orbit at the required altitude and distance in various areas as follows:

  1. 40 NM

    1. Radial 011°-020° altitude should not below 5 000 FT

    2. Radial 021°-050° altitude should not below 4 000 FT

    3. Radial 051°-100° altitude should not below 2 000 FT

    4. Radial 101°-110° altitude should not below 4 000 FT

    5. Radial 111°-190° altitude should not below 2 000 FT

    6. Radial 191°-225° altitude should not below 4 000 FT

    7. Radial 226°-230° altitude should not below 6 000 FT

  2. 30 NM (Due to border limited)

    1. Radial 231°-270° altitude should not below 5 000 FT

  3. 20 NM (Due to border limited)

    1. Radial 271°-010° altitude should not below 5 000 FT

HAT YAI

DVOR/DME

 HTY

115.3 MHZ

(CH 100X)

H24

065602.75N

1002316.47E

37.3 M

DVOR/DME restriction, due to mountainous terrain surround DVOR/DME station coverage check does not provide adequate signal to 40 NM at the required altitude in various areas as follows:

  1. Radial 171º- 240º at 10 NM ALT should not below 5 000 FT

  2. Radial 131º- 170º at 20 NM ALT should not below 4 000 FT

  3. Radial 031º-130º at 40 NM ALT should not below 5 000 FT

  4. Radial 241º- 270º at 40 NM ALT should not below 7 000 FT

  5. Radial 271º- 300º at 40 NM ALT should not below 10 000 FT

  6. Radial 301º- 330º at 40 NM ALT should not below 6 000 FT

  7. Radial 331º- 030º at 40 NM ALT should not below 3 000 FT

HUA HIN

DVOR/DME

 HHN

113.3 MHZ

(CH 80X)

H24

123804.04N

0995704.23E

-

DVOR/DME restriction, due to terrain surround DVOR/DME station coverage check does not provide adequate signal 40 NM at required altitude in various areas as follows:

  1. 40 NM clockwise orbit

    1. Radial 001°-170° altitude should not below 3 000 FT

    2. Radial 171°-210° altitude should not below 7 000 FT

    3. Radial 301°-340° altitude should not below 10 000 FT

    4. Radial 340°-360° altitude should not below 3 000 FT

  2. 30 NM clockwise orbit (Due to border limited)

    1. Radial 211°- 300° altitude should not below 10 000 FT

  3. Radial 341° distance 10.3 DME at altitude 4 000 FT found roughness out of tolerance

KAMPHAENG SAEN

DVOR/DME

 KPS

114.5 MHZ

(CH 92X)

2300-1100

140956N

0995715E

-

KHON KAEN

DVOR/DME

 KKN

114.9 MHZ

(CH 96X)

H24

162814.73N

1024716.07E

-

DVOR/DME restriction due to terrain surround DVOR/DME station, coverage check does not provide adequate signal 40 NM at required altitude in various areas as follows:

  1. Radial 001°-080° altitude should not below 2 500 FT

  2. Radial 081°-220° altitude should not below 2 000 FT

  3. Radial 221°-360° altitude should not below 3 500 FT

KHORAT

DVOR/DME

 KRT

113.7 MHZ

(CH 84X)

H24

145502.35N

1020823.32E

-

DVOR/DME restriction due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal clockwise orbit 40 NM at required altitude in various areas as follows:

  1. Radial 081°-280° altitude should not below 5 000 FT

  2. Radial 281°-080° altitude should not below 3 500 FT

KRABI

DVOR/DME

 KBI

111 MHZ

(CH 47X)

H24

080627.19N

0985839.07E

-

DVOR/DME restriction due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal to 40 NM at required altitude in various areas as follows:

  1. Radial 001º-180º altitude should not below 5 500 FT

  2. Radial 181º-200º altitude should not below 7 000 FT

  3. Radial 201º-340º altitude should not below 10 000 FT

  4. Radial 341º-360º altitude should not below 15 500 FT

LAMPANG

DVOR/DME

 LPN

114.7 MHZ

(CH 94X)

H24

181635.87N

0993008.40E

-

DVOR/DME restriction, due to terrain surround DVOR/DME station coverage check does not provide adequate signal to 40 NM at required altitudes in various areas as follows:

  1. Radial 351º-070º beyond 40 NM should not below 6 000 FT

  2. Radial 071º-130º beyond 30 NM should not below 6 000 FT

  3. Radial 131º-320º beyond 40 NM should not below 6 000 FT

  4. Radial 321º-350º beyond 30 NM should not below 6 000 FT

LOEI

DVOR/DME

 LOY

115.9 MHZ

(CH 106X)

H24

172649.38N

1014323.12E

-

DVOR/DME restriction,

  1. Unusable due to roughness out of tolerance

    1. Radial 020° between 10-11 DME altitude 3 000 FT

    2. Radial 243° between 7-8 DME altitude 6 000 FT and between 32-33 DME altitude 7 500 FT

  2. Due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal to 40 NM at the required altitude in various areas as follows:

    1. 40 NM orbit

      1. Radial 030°-050° altitude should not below 10 000 FT

      2. Radial 051°-100° altitude should not below 7 000 FT

      3. Radial 101°-130° altitude should not below 10 000 FT

      4. Radial 131°-200° altitude should not below 5 000 FT

      5. Radial 201°-250° altitude should not below 12 000 FT

      6. Radial 251°-270° altitude should not below 13 000 FT

    2. 20 NM orbit (Due to border limited)

      1. Radial 271°-029° altitude should not below 4 500 FT

MAE HONG SON

DVOR/DME

 MHS

115.5 MHZ

(CH 102X)

H24

191910.73N

0975443.50E

-

DVOR/DME restrictions,

  1. Unusable due to roughness out of tolerance

    1. Radial 040° distance between 10.5-12.5 DME altitude 5 500 FT

    2. Radial 085° distance between 5.5-7.5 DME altitude 7 000 FT

    3. Radial 100° distance between 9.0-10.0 DME altitude 7 000 FT

    4. Radial 120° distance between 9.5 - 10.5 DME altitude 7 500 FT

  2. Due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal to 40 NM at the required altitude in various areas as follows:

    1. Radial 060°-080° altitude should not below 8 500 FT

    2. Radial 081°-140° altitude should not below 13 000 FT

    3. Radial 141°-190° altitude should not below 9 000 FT

    4. Radial 191°-059° unable to perform due to border limited

MAE SOT

DVOR/DME

 MST

116.7 MHZ

(CH 114X)

H24

164152.13N

0983229.68E

-

DVOR/DME restrictions,

  1. Unusable due to roughness out of tolerance

    1. Radial 104° distance between 6.0-13.0 DME altitude 5 500 FT

    2. Radial 012° distance between 22.0-24.0 DME altitude 5 000 FT

    3. Radial 124° distance between 32.0-34.0 DME altitude 6 600 FT

  2. Due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal clockwise orbit 40 NM at the required altitude in various areas as follows:

    1. Radial 000°-030° altitude should not below 7 000 FT

    2. Radial 031°-060° altitude should not below 9 000 FT

    3. Radial 061°-070° altitude should not below 10 000 FT

    4. Radial 071°-120° altitude should not below 9 000 FT

    5. Radial 121°-360° unable to perform due to border limited

NAKHON PHANOM

DVOR/DME

 NKP

111.6 MHZ

(CH 53X)

H24

172317.87N

1043818.01E

-

DVOR/DME restriction due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal to 40 NM at required altitudes in various areas as follows:

  1. Radial 181°-190° altitude should not below 2 500 FT

  2. Radial 191°-260° altitude should not below 4 000 FT

  3. Radial 261°-320° altitude should not below 2 500 FT

  4. Radial 321°-180° unable to check (Due to border limited)

NAKHON SI THAMMARAT

DVOR/DME

 NKS

117.4 MHZ

(CH 121X)

H24

083229.95N

0995648.67E

-

Due to mountainous terrain surround DVOR/DME station coverage check does not provide adequate signal to 40 NM at required altitudes is various areas:

  1. Radial 001º-190º beyond 40 NM should not below 2 500 FT

  2. Radial 191º-240º beyond 40 NM should not below 7 000 FT

  3. Radial 241º-280º beyond 25 NM should not below 8 000 FT

  4. Radial 281º-320º beyond 40 NM should not below 7 000 FT

  5. Radial 321º-360º beyond 40 NM should not below 5 000 FT

NAN

DVOR/DME

 NAN

115.7 MHZ

(CH 104X)

H24

184832.76N

1004657.31E

-

DVOR/DME restriction, due to mountainous terrain surround DVOR/DME station coverage check does not provide adequate signal to 40 NM at the required altitude in various areas as follows:

  1. Radial 011º-110º at 20 NM should not below 8 000 FT

  2. Radial 111º-160º at 20 NM should not below 6 000 FT

  3. Radial 161º-180º at 40 NM should not below 6 000 FT

  4. Radial 181º-330º at 40 NM should not below 7 000 FT

  5. Radial 311º-010º at 40 NM should not below 8 000 FT

NARATHIWAT

DVOR/DME

NTW 116.3 MHZ

(CH 110X)

H24

063138.24N

1014442.48E

-

DVOR/DME restriction due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal to 40 NM at the required altitude in various areas as follows:

  1. 40 NM clockwise orbit flown from

    1. Radial 271º-290º altitude should not below 9 000 FT

    2. Radial 291º-300º altitude should not below 4 000 FT

    3. Radial 301º-020º altitude should not below 2 000 FT

  2. 20 NM clockwise orbit flown from

    1. Radial 021º-130º altitude should not below 2 000 FT

    2. Radial 131º-270º altitude should not below 5 000 FT

PATTANI

NDB

PT

201 KHZ

H24

064718.45N

1010852.51E

-

PHETCHABUN

DVOR/DME

 PCB

115.4 MHZ

(CH 101X)

H24

164033.66N

1011148.12E

-

DVOR/DME restrictions,

  1. Unusable due to roughness out of tolerance on radial 277° distance between 7-9 DME altitude 5 500 FT

  2. Due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal to 40 NM at the required altitude in various areas as follows:

    1. Radial 061°-230° beyond 30 NM altitude should not below 6 500 FT

    2. Radial 231°-320° beyond 30 NM altitude should not below 8 000 FT

    3. Radial 321°-060° beyond 40 NM altitude should not below 7 500 FT

PHITSANULOK

DVOR/DME

 PSL

114.1 MHZ

(CH 88X)

H24

164613.34N

1001728.70E

-

DVOR/DME restriction due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal to 40 NM at the required altitude in various areas as follows:

  1. Radial 351°-120° altitude should not below 5 500 FT

  2. Radial 121°-270° altitude should not below 3 000 FT

  3. Radial 271°-300° altitude should not below 5 000 FT

  4. Radial 301°-350° altitude should not below 3 500 FT

PHRAE

DVOR/DME

 PAE

111.8 MHZ

(CH 55X)

H24

180802.78N

1000958.35E

-

DVOR/DME restrictions,

  1. Unusable due to roughness out of tolerance on radial 146° distance between 7.0-8.0 DME altitude 7 000 FT

  2. Due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal to 40 NM at the required altitude in various areas as follows:

    1. Radial 055º-080º altitude should not below 9 000 FT

    2. Radial 081º-160º altitude should not below 11 000 FT

    3. Radial 161º-180º altitude should not below 8 000 FT

    4. Radial 181º-350º altitude should not below 6 000 FT

    5. Radial 351º-054º altitude should not below 6 500 FT

PHUKET

DVOR/DME

 PUT

116.9 MHZ

(CH 116X)

H24

080654.83N

0981822.69E

16.72 M

DVOR/DME restriction, due to mountainous terrain surround DVOR/DME station coverage check does not provide adequate signal to 40 NM at the required altitude in various areas as follows:

  1. Radial 360º-030º altitude should not below 5 500 FT

  2. Radial 031º-170º altitude should not below 9 000 FT

  3. Radial 171º-220º altitude should not below 7 000 FT

  4. Radial 221º-359º altitude should not below 3 000 FT

RANONG

DVOR/DME

 RAN

113.4 MHZ

(CH 81X)

H24

094643.18N

0983502.11E

-

DVOR/DME restriction due to mountainous terrain surround DVOR/ DME station coverage, check does not provide adequate signal to 40 NM at the required altitude in various areas as follows:

20 NM orbit

  1. Radial 020°-040° altitude should not below 6 000 FT

  2. Radial 041°-060° altitude should not below 12 000 FT

  3. Radial 061°-120° altitude should not below 16 000 FT

  4. Radial 151°-170° altitude should not below 9 000 FT

40 NM orbit

  1. Radial 121°-150° altitude should not below 16 000 FT

  2. Radial 171°-187° altitude should not below 12 000 FT

  3. Radial 188°-230° altitude should not below 7 000 FT

  4. Radial 231°-019° unable to fly due to border limited.

RAYONG

DVOR/DME

 RYN

112.5 MHZ

(CH 72X)

H24

124648.3N

1014041.7E

-

DVOR/DME restriction due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal clockwise orbit 40 NM at required altitude in various areas as follows:

  1. Radial 011º-040º altitude should not below 9 000 FT

  2. Radial 041º-050º altitude should not below 4 000 FT

  3. Radial 051º-080º altitude should not below 6 000 FT

  4. Radial 081º-240º altitude should not below 4 000 FT

  5. Radial 240º-010º altitude should not below 5 000 FT

ROI-ET

DVOR/DME

 ROT

111.2 MHZ

(CH 49X)

H24

160700.59N

1034619.45E

-

Coverage orbit data refer from commissioning checked as follows:

  1. 40 NM clockwise orbit flown from radial 001°-360° altitude should not below 2 000 FT

  2. Airway W5 flown to 40 NM at 2 000 FT was checked and found satisfactory

SAKON NAKHON

DVOR/DME

 SKN

114.2 MHZ

(CH 89X)

H24

171250.89N

1040812.34E

-

DVOR/DME restriction due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal at required altitude in various areas as follows:

  1. 30 NM orbit (Due to border limited)

    1. Radial 000º-130º altitude should not below 2 100 FT

  2. 40 NM orbit

    1. Radial 131º-280º altitude should not below 5 500 FT

    2. Radial 281º-359º altitude should not below 2 100 FT

SONGKHLA

DVOR/DME

 SKL

113.5 MHZ

(CH 82X)

H24

071119.65N

1003615.11E

-Military facility
SAMUI

DVOR/DME

 SMU

117.6 MHZ

(CH 123X)

H24

093249.47N

1000342.27E

24 M

DVOR/DME restriction due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal at required altitude in various areas as follows:

  1. Radial 000º-015º beyond 25 NM altitude should not below 4 000 FT

  2. Radial 016º-040º beyond 25 NM altitude should not below 6 000 FT

  3. Radial 041º-060º beyond 20 NM altitude should not below 11 000 FT

  4. Radial 061º-070º beyond 25 NM altitude should not below 9 000 FT

  5. Radial 071º-120º beyond 40 NM altitude should not below 11 000 FT

  6. Radial 121º-180º beyond 40 NM altitude should not below 5 000 FT

  7. Radial 181º-210º beyond 25 NM altitude should not below 8 000 FT

  8. Radial 211º-260º beyond 20 NM altitude should not below 9 000 FT

  9. Radial 261º-280º beyond 25 NM altitude should not below 7 000 FT

  10. Radial 281º-360º beyond 40 NM altitude should not below 8 000 FT

SURAT THANI

DVOR/DME

 STN

110.6 MHZ

(CH 43X)

H24

090746.24N

0990805.09E

-

DVOR/DME restriction, due to mountainous terrain surround DVOR/DME station coverage orbit 40 NM as follows:

  1. Radial 001º-070º altitude should not below 1 500 FT

  2. Radial 071º-090º altitude should not below 3 500 FT

  3. Radial 091º-150º altitude should not below 5 000 FT

  4. Radial 151º-190º altitude should not below 1 500 FT

  5. Radial 191º-360º altitude should not below 4 000 FT

  6. Radial 227º distance approximate 10-13 DME out of tolerance roughness and scalloping

SUKHOTHAI

NDB
DME

 THS

292 KHZ

(CH 40X)

H24

171406.81N

0994919.23E

181.03 FT

  1. Route coverage checked on bearing 021° from THS to PR altitude 9 000 FT flown to 57 NM found satisfactory

  2. Coverage 50 NM clockwise orbit data refer from commissioning checked as follows:

    1. Bearing 041°-100° at altitude 4 000 FT

    2. Bearing 101°-190° at altitude 2 000 FT

    3. Bearing 191°-040° at altitude 5 000 FT

DME: Paired with NDB Freq.

DME Coordinates 171408.27N 0994906.89E

TAKHLI

NDB

 TL

350 KHZ

H24

151633.45N

1001751.11E

-

TAK

NDB

 TK

332 KHZ

H24

165358.24N

0991507.91E

Output 25 watts

  1. Route coverage checked and result found satisfactory as follows:

    1. Bearing 098° from TK to PL altitude 7 000 FT flown to 56 NM

    2. Bearing 254° from TK to MS altitude 7 000 FT flown to 36 NM

  2. Coverage 15 NM clockwise orbit data refer from commissioning checked as follows:

    1. Bearing 001°-360° at altitude 3 500 FT

TRANG

DVOR/DME

 TRN

116.6 MHZ

(CH 113X)

H24

073032.17N

0993733.67E

-

DVOR/DME restriction due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal at the required altitude in various areas as follows:

  1. 20 NM orbit

    1. Radial 081°-130° altitude should not below 6 000 FT

  2. 40 NM orbit

    1. Radial 131°-350° altitude should not below 4 000 FT

    2. Radial 351°-030° altitude should not below 6 000 FT

    3. Radial 031°-080° altitude should not below 7 000 FT

TRAT

NDB

 TRT

384 KHZ

(CH 36X)

H24

121628.10N

1021850.08E

-

NDB restriction, due to NDB 50 NM orbit coverage data found as follows:

  1. Bearing 001º-130º unusable due to border limited

  2. Bearing 131º-320º altitude should not below 5 000 FT

  3. Bearing 321º-360º altitude should not below 8 000 FT

UBON

DVOR/DME

 UBL

112.7 MHZ

(CH 74X)

H24

151442.71N

1045157.30E

-

DVOR/DME restriction

  1. Due to obstacles surround DVOR/DME station, coverage check does not provide adequate signal clockwise orbit at required altitude in various areas as follows:

    1. 40 NM

      1. Radial 111°-155° altitude should not below 3 000 FT

      2. Radial 156°-165° altitude should not below 7 000 FT

      3. Radial 166°-200° altitude should not below 5 000 FT

      4. Radial 201°-070° altitude should not below 3 000 FT

    2. 30 NM (Due to border limit)

      1. Radial 071°-110° altitude should not below 2 000 FT

  2. During 6 NM orbit (CW) found 30 Hz. AM modulation is fluctuated within 29%-40% between radials 170°-190°. Notify to grounds maintenance, the problem may have occurred from surround obstructions close to the DVOR/DME stations.

    1. Ground maintenance action and flight check requirement verifies on radial 175°altitude 2 000 FT, distance 5-20 NM found the 30 Hz. AM modulation is fluctuated within 25%-35%. But found the DME unlock beyond 10 NM.

    2. DVOR/DME UBL, Azimuth unusable 170°-190° (CW) beyond 10 NM altitude 2 000 FT

UDON

DVOR/DME

 UDN

114.3 MHZ

(CH 90X)

H24

172304.20N

1024630.05E

-

DVOR/DME restriction, due to mountainous terrain surround DVOR/DME station coverage check does not provide adequate signal at required altitudes in various areas as follows:

  1. 20 NM orbit (Due to border limited)

    1. RDL 331º-030º ALT should not below 2500 FT

  2. 40 NM orbit

    1. RDL 031º-090º ALT should not below 3000 FT

    2. RDL 091º-190º ALT should not below 4000 FT

    3. RDL 191º-220º ALT should not below 5000 FT

    4. RDL 221º-330º ALT should not below 4000 FT

  3. The airways were checked and result found satisfactory

    1. Airway W15 on RDL 097º flown to 40.1 NM ALT 4000 FT

    2. Airway W4 on RDL 143º flown to 50.0 NM ALT 4000 FT

U-TAPAO

DVOR/DME

 BUT

110.8 MHZ

(CH 45X)

H24

124000.02N

1010001.71E

6 M

DVOR/DME restriction, due to mountainous terrain surround DVOR/DME station, coverage check does not provide adequate signal clockwise orbit 40 NM at required altitude and distance in various areas:

  1. Radial 101°-170° altitude should not below 2 000 FT

  2. Radial 171°-250° altitude should not below 6 000 FT

  3. Radial 251°-320° altitude should not below 8 000 FT

  4. Radial 321°-050° altitude should not below 8 000 FT

  5. Radial 051°-100° altitude should not below 4 000 FT