MICROWAVE PATH PROPAGATION RELIABILITY PREDICTIONS INDEPENDENT HILL - ROSSLYN

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP88-01418R000200130007-1
• Release Decision: RIFPUB
• Original Classification: K
• Document Page Count: 33
• Document Creation Date: December 22, 2016
• Document Release Date: May 31, 2011
• Sequence Number: 7
• Publication Date: January 7, 1986
• Content Type: MISC

Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
, SEARCH
Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
Prepared for
OVERSEAS TELECOMMUNICATIONS, INC.
ROSSLYN, VIRGINIA
COMSEARCH, INC.
SYSTEMS ENGINEERING DIVISION
1307 GLENVILLE DRIVE
RICHARDSON, TEXAS 75081
J
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 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
1. INTRODUCTION
II. SUMMARY OF RESULTS
III. CONCLUSIONS
IV. SUPPORT DOCUMENTATION
1. Independent Hill - Arlington (WETA)
a. Path Data Sheets
b. Path Reliability Predictions
2. Arlington (WETA) - Rosslyn
a. Path Data Sheets
b. Path Reliability Predictions
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 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
zMa
I. INTRODUCTION
This report presents the results of frequency studies and
path propagation reliability predictions performed on behalf
of Overseas Telecommunications,Inc. for the proposed
microwave system connecting customer transmit-receive earth
terminal facilities in Independent Hill, Virginia with office
facilities in Rosslyn, Virginia.
The microwave path study report issued January 6, outlined
numerous interconnect possibilities which appeared feasible
based on field verification of potential sites together with
path profile path studies. This report specifically
addresses one of the most direct routings that can be
achieved, namely Independent Hill - Rosslyn via a single
repeater utilizing the existing self-supporting tower in
Arlington, Virginia, serving station WETA broadcasting
facilities.
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 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
UMLAKGH
II. SUMMARY OF RESULTS
This section of the report summarizes the results of
frequency studies and path reliability studies for the
proposed microwave links connecting Independent Hill,
Virginia and Rosslyn, Virginia.
FREQUENCY STUDY RESULTS
Independent Hill _ Arlington (WETA) - This path is 25.3
miles in length with approximate antenna heights of 300 feet
at WETA and 225 feet at Independent Hill. Frequency studies
indicate a very high probability for establishing either
full band 6 or 11 GHz common carrier frequencies for this
link. If 6 GHz is selected for operation, it will be
necessary to share frequencies with the proposed transmit-
receive earth station planned at Independent Hill. Transmit
frequency recommendations are:
Independent Hill
Arlington
(WETA)
6 GHz
11 GHz
6 GHz
11 GHz
5945.20V
11405V
6197.24V
10755V
5974.85H
11685H
6226.89V
10955H
6004.50V
11645V
6256.54V
10995V
6034.15H
11445H
6286.19H
10715H
6063.80V
11325V
6315.84V
11155V
6093.45H
11605H
6345.49H
10875H
6123.10V
11565V
6375.14V
10915V
6152.75H
11365H
6404.79H
11115H
11245H
11075V
11525H
1 0795H
11485V
10835V
11285H
11035H
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Frequency analysis was performed in the 6 GHz band assuming
use of Andrew Corporation UHX10-59H or UHX12-59J series
antennas in combination with Microwave Associates Radios,
MA85TO7H, exhibiting a transmit power of 5 watts. Refer to
path data sheets in Section IVa. Andrew UHX10-107H type
antennas were selected for the 11 GHz studies together with
Microwave Associates MA85T126 radios exhibiting a transmit
power of 1.5 watts.
Arlington JWETA) - Rosslyn - This path is 3.2 miles in
length with antenna center line requirements of
approximately 225 feet at WETA and 145 feet at Rosslyn (five
feet above roof level). Since the path is so short, initial
frequency studies were performed in the 11 GHz band.
Frequency results are as follows.
11 GHz Common Carrier Band - GTE Sprint 11 GHz frequencies
-- --- ------ ------- ----
planned a nd in use at the WETA tower together with 11 GHz
frequency conflicts with ATT Garden City facilities prohibit
the establishment of 11 GHz frequencies on the WETA-Rosslyn
link.
6 GHz Common Carrier Band - Frequency studies indicate a
- --- ------ ------- very high probability for establishing full band (8 duplex
r.f. channels) on this link considering terrestrial
facilities only. There are a number of problems with
transmit earth stations in the Arlington/Rosslyn area which
would have to be resolved through further office studies and
confirmation through RFI field measurements. This band with
a 4 duplex r. f. channel r e q u i re me nt probably has a 50
percent chance for utilization at this time. If it becomes
necessary to use this band, there wwi 11 be the further
requirement to submit a waiver to the Federal Communications
Commission because of the short path length involved.
Justification is usually made through intended use and
stringent reliability requirements.
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,JOMSEAiCN
23 GHz Common Carrier Band - Frequency studies indicate the
-- --- ------ ------- availability of at least five (5) duplex r.f. channels from
either of two frequency plans. One or two frequencies are
conditional acceptable based on further analysis work to
determine local blockage. Frequencies are as listed on path
data sheets of Section IVa.
PATH RELIABILITY PREDICTIONS
Path reliability prediction sheets are included in Section
IVb. of the report. The following summarizes pertinent data
concerning each path.
Independent Hill - Arlington (WETA)
6 GHz Band Operation
Propagation outages were predicted assuming non-diversity
hot standby radio equipment configurations for 10 and 12
foot parabolic antennas and MA-COM MA85TO7H 5 watt radios.
2 Way Unavailability Long Haul
(Seconds Per Year) 2 Way Obj.
10' Antennas 39.6 19.9
12' Antennas 18.9 19.9
As noted the pro-rated long haul objective can be met using
12 foot antennas. If 99.99% overall system reliability is
required for the combined satellite and terrestrial links,
the pro-rated reliability for propagation only i n the
terrestrial link could be met using 10 foot antennas.
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4UMLRflbfl
INCORPORATE()
11 GHz Band Operation
Propagation outages were predicted assuming non-diversity
hot standby radio equipment configurations for 10 and 12
foot parabolic antennas and MA-COM MA126 0.5 watt and 0.7
watt radios.
2-Way 2-Way 2-Way
Unavailability Unavailability Total
Multi-Path Rain Unavailability
Minutes/Yr. Minutes/Yr. Minutes/Yr.
----------- ----------- -----------
10' Antennas
.5 Watt Tx. 2.95 77.9 80.9
.7 Watt Tx. 2.09 73.0 75.1
12' Antennas
.5 Watt Tx. 1.55 68.4 69.9
.7 Watt Tx. 1.09 62.7 63.8
The above assumes worst case outages due to rain for
horizontal polarizations. If vertical polarizations can be
utilized the total 2-way unavailability for .5 watt
operation becomes 56.8 and 45.8 minutes per year for 10' and
12' antennas respectively. For 0.7 watt transmitter
operation, the total unavailability becomes 50.3 and 40.7
minutes per year respectively for 10 and 12 foot antenna
application.
As can be seen, the rain outage totally controls the overall
path propagation performance. This outage is due to heavy
rainfall rates associated with thundercells which average 3
to 5 kilometers in circumference. Since the proposed path
is in a northeasterly direction and the majority of storms
move west to east, the duration of each outage will last on
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the order of 5 to 10 minutes. There will be occasions,
however, when a storm cell may travel the path in the
direction of transmission in which case, the outage could
exceed 15 minutes or more. For planning purposes, the
majority of thunderstorms experienced in the greater
Washington, D.C. area occur during the summer months between
the hours of 4 PM and 12 PM.
ArlinRl n kWETAM = Rosslyn
23 GHz Band Operation
The predicted propagation outage for the path is controlled
by rain and is 18.4 minutes for horizontal polarization and
10.7 minutes for vertical polarization.
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 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
AOMSURH
III. CONCLUSIONS
o The WETA tower in Arlington, Virginia, if available for
use, can serve as an intermediate repeater point to provide
microwave interconnect between Independent Hill, VA and
Rosslyn, VA.
o Full band 6 GHz or 11 GHz common carrier frequencies can be
assigned on the Independent Hill-Arlington (WETA) microwave
link. If 6 GHz is selected, sharing must be made with
proposed Independent Hill earth station.
o Five duplex 23 Ghz band frequencies are available for
assignment on the Arlington (WETA) - Rosslyn link. 11 GHz
is not available and 6 GHz is conditionally acceptable
pending resolution of a number of interference cases from 6
GHz operating earth stations in the Arlington/Rosslyn area.
o Total cumulative outage due to propagation for a 6 GHz link
to Independent Hill from WETA and 23 GHz to Rosslyn is
predicted to be approximately 37 minutes for horizontally
polarized 23 GHz channels or 20 minutes for vertical
channels.
o Total cumulative outage due to propagation for a 11 GHz
link to Independent Hill from WETA and 23 GHz to Rosslyn is
predicted to be approximately 60 to 70 minutes a year
randomly distributed according to thunderstorm activity.
This outage could be 5 times greater during a worst case
year.
o The 23 GHz radio is planned for installation at the
required antenna height level on the WETA tower. This will
require tower access to perform maintenance on the radio
equipment.
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 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
IV. SUPPORT DOCUMENTATION
1. Independent Hill - Arlington (WETA)
a. Path Data Sheets
b. Path Reliability Predictions
2. Arlington (WETA) - Rosslyn
a. Path Data Sheets
b. Path Reliability Predictions
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 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
IV. SUPPORT DOCUMENTATION
1. Independent Hill - Arlington (WETA)
a. Path Data Sheets
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 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
1307 GLENVIL.L.E DRIVE
R a. cr1A %D%:0:v. TX 755\i
(L!4)
SITE NAM
CALL SIGN
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 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
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R I CHARDSON. TX 75QEi 1
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 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
C O!"i t t:. hl rtc -; . I N c'.
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1307 G; _ENV fi LLc: DRIVE'
RICHARDSON. TX 75061
(ai4) a3 - a +E_
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LONGITUDE (DDDMMSS. S)
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.....r Approved For Release 2011/05/31 : CIA-RDP88-01418R000200130007-1
 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
IV. SUPPORT DOCUMENTATION
1. Independent Hill - Arlington (WETA)
b. Path Reliability Predictions
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 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
COMSEARCH INC.
1307 GLENV I LLE DRIVE
RICHARDSON, TX 75081
CUSTOMER: OVERSEA TELCOM PATH NO: 2
SYSTEM: VIRGINIA
TYPE RADIO: MA85TO7H TYPE CARRIER: VIDEO
RF FREQUENCY (GHZ): 6.175
RECEIVER I F BANDWIDTH (MH Z.) : 30.
CHANNEL LOADING: 1
CALCULATED CHANNEL. SLOT (KHZ): 4000 SITE A: WETA
CHAN DEV (KHZ) : 4000 PRE EMPHASIS CC I R SITE B: INDEPENDENT
ENGINEER: L THELANER DATE:6 JAN 86 SITE A: SITE B
--------------------------------------------------------------------
TOWER HEIGHT
(FT) !
300 !
225
MAIN ANTENNA HEIGHT
(FT)
300 !
225
DIVERSITY ANTENNA HEIGHT
(FT)
0
0
MAIN ANTENNA SIZE
(FT)
10
10
DIVERSITY ANTENNA SIZE
(FT)
0
0
MAIN ANTENNA GAIN
(DB) !
43.2
43.2
DIVERSITY ANTENNA GAIN
(DB) !
.0
.0
MAIN WAVEGUIDE LENGTH
(FT)
310
235
WAVEGUIDE LOSS (EW52 ) 1.2 DB/100 (FT)
STACKING LOSS
(DB)
(DE)
1.7
1.5
2.8
1.5
RADOME LOSS
OTHER LOSSES
(DB)
(DB)
.0 !
.0
.0
PATH LENGTH
(MI)
25.3
SPACE LOSS
(DB) !
140.5
FIELD MARGIN (LOSS)
(DB) !
1.0
TOTAL LOSSES
(DB)
151.0
TOTAL GAINS
(DB) !
86.4
NET PATH LOSS
(DE,)
64.6
TRANSMITTER OUTPUT POWER
(DE;M)
35.6
!
MEDIAN RECEIVED CARRIER LEVEL
RECEIVER THRESHOLD
(DIN)
(DBM)
-29.0
THERMAL. FADE MARGIN
(DB)
50. 0
- --__
--
-
-
----------
-
-------------- --..- .....-_---- - - ___------
Y _ ONE:--WAY
I
-
--
-
-7
7000000627
!
UNAVAILABIL
T
UNAVAILABILITY ONE-WAY
SECONDS
19.8
RELIABILITY NON DIVERSITY 99.999937
PATH 2 WAY I iNAVAB I I_. I TY . 00000 1254
PATH 2 WAY UNAVAB I L I TY SECONDS 39.558
PATH 2-WAY RELIABILITY ' 99.999875
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 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
COMSEARCH INC.
1307 GLENVILLE DRIVE
RICHARDSON, TX 750B1
CUSTOMER: OVERSEA TELCOM
SYSTEM: VIRGINIA
TYPE RADIO: MA85TO7H
RF FREQUENCY (GHZ): 6.175
RECEIVER I F BANDWIDTH (MHZ) :
30.
CHANNEL LOADING: 1
CALCULATED CHANNEL SLOT (KHZ):
4000
SITE
A:
WETA
CHAN DEV (KHZ): 40(X) PRE EMPHASIS CCIR
SITE
B:
INDEPENDENT
ENGINEER: L THELANER
DATE:6 JAN 86
SITE
A:
SITE B
TOWER HEIGHT (FT)
MAIN ANTENNA HEIGHT (FT)
DIVERSITY ANTENNA HEIGHT (FT)
MAIN ANTENNA SIZE (FT)
DIVERSITY ANTENNA SIZE (FT)
MAIN ANTENNA GAIN (DB)
DIVERSITY ANTENNA GAIN (DB)
MAIN WAVEGUIDE LENGTH (FT)
WAVEGU I DE LOSS (EW52 ) 1.2 DB / 100 (FT) (DB )
STACKING LOSS (DB)
RADOME LOSS (DB)
OTHER LOSSES
PATH LENGTH
SPACE LOSS
FIELD MARGIN (LOSS)
TOTAL LOSSES
TOTAL GAINS
NET PATH LOSS
TRANSMITTER OUTPUT POWER
MEn I AN RECEIVED CARRIER LEVEL.
RECEIVER THRESHOLD
THERMAL FADE: MARGIN
(DB)
(MI)
(DB)
(DB)
(DB)
(DB)
(DB)
(DBM)
(DBM)
(DEB
(DE)
300 ! 225 !
300 ! 225
12 12
0 0
44.8 ! 44.8
.0 ! .0
310 ! 235
3.7 ! 2.8
1.5 ! 1.5
.0 ! .()
.0
2 C
140.5
1. 0
151. 0
89.6
61.4
35.6
-25.8
7. ()
53.2
UNAVAILABILITY ONE-WAY .000000300 UNAVAILABILITY ONE-WAY SECONDS ' 9.5 RELIABILITY NON DIVERSITY ! 99.999970
PATH 2 WAY LNAVAB I L I TY .000000600
PATH 2 WAY UNAVABILITY SECONDS ! 10.90
PATH 2-WAY RELIABILITY 99.999940
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 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
COMSEARCH INC.
1 307 GLENV I LLE DRIVE
RICHARDSON, TX 75001
CUSTOMER: OVERSEAS TELECOM
SYSTEM: VIRGINIA
(MI)
(DB)
(DB)
(DB)
(DB)
(DB)
(DBM)
(DBM)
(DBM)
(DB)
TYPE RADIO: MA-12G TYPE CARRIER: VIDEO
RF FREQUENCY (GHZ) : 20-~
RECEIVER IF BANDWIDTH (MHZ): 30.
CHANNEL LOADING: 1
CALCULATED CHANNEL SLOT (KHZ) : 4000 SITE A: WETA
CHAN DEV (KHZ): 4000 PRE EMPHASIS CCIR SITE B: INDEPENDENT
ENGINEER: L THELANER DATE:6 JAN 86 SITE A: SITE B
TOWER HEIGHT (FT)
MAIN ANTENNA HEIGHT (FT)
DIVERSITY ANTENNA HEIGHT (FT)
MAIN ANTENNA SIZE (FT)
DIVERSITY ANTENNA SIZE (FT)
MAIN ANTENNA GAIN (DB)
DIVERSITY ANTENNA GAIN (DB)
MAIN WAVEGUIDE LENGTH (FT)
WAVEGUIDE LOSS (WC109) 1.3 DB; 1C 0 (FT) (DB)
STACKING LOSS (DB)
RADOME LOSS (DD)
OTHER LOSSES
PATH LENGTH
SPACE LOSS
FIELD MARGIN (LOSS)
TOTAL LOSSES
TOTAL GAINS
NET PATH LOSS
TRANSMITTER OUTPUT POWER
MEDIAN RECEIVED CARRIER LEVEL
RECEIVER THRESHOLD
THERMAL FADE MARGIN
-
UNAVAILABILITY ONE-WAY -
UNAVAILABILITY ONE-WAY
RELIABILITY NON DIVERSITY
300 ! 225
3t )C) ! 225
0 0
.iLL ! r'~ !
0 ! 0
48.4 ! 48.4
.0 ! .0
310 235
4.0 3.1 1.5 ! 1.5 !
. 0 . (_) !
145.6
1.0
156.7
96.8
59.9
'-'..0
--_2.9
-79.0
46.1.
.0C10002803 SECONDS ! 88.4
99.999720
PATH 2 WAY UNAVAB I L I TY ! .000005606 PATH 2 WAY UNAVABILITY SECONDS ! 176.796
PATH 2-WAY RELIABILITY 99.999439
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TRANSMIT SITE
RECEIVE SITE
WETA
INDEPENDENT
RAIN
1st
OUTAGE METI-40D
& 2nd RAIN RATES- MM/YR
U. S.
173
41
1st
& 2nd RAIN TIMES- MIN/YR
1
1 OC)
FREQUENCY BAND-GHZ 11.2
-PATH
DISTANCE -MI
25.3
FADE
MARGIN IN DB
46.1
TWET
RADOME LOSS-DB
i
L
POLARIZATION
(-'ANNUAL RAIN OUTAGE-MINUTES/YEAR
i
HORIZONTAL
77.9
POLARIZATION
PANNUAL RA 1N O(J7 AGE--1"I I NLUTEZ')'/YEAR
L
VERTICAL
5 3
'TOTE: CALCULATIONS OF THE RAIN OUTAGES PER YEAR ARE BASED ON
EXTRAPOLATIONS OF LONG TERM RAINFALL STATISTICS. ACTUAL RAIN OUTAGES
ARE TYPICALLY SEVERAL MINUTES IN DURATION BUT MAY OCCUR ONLY ONCE
OVER A PERIOD OF SEVERAL. YEARS
""""' Approved For Release 2011/05/31 : CIA-RDP88-01418R000200130007-1
 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
COMSEARCH INC.
1307 GLENVILLE DRIVE
RICHARDSON, TX 75081
r
L
CUSTOMER: OVERSEAS TELECOM PATH NO: ..
SYSTEM:VIRGIN]:A
TYPE RADIO: MA-12G TYPE CARRIER: VIDEO
RF FREQUENCY (GHZ): _11,200-
RECEIVER IF BANDWIDTH (MHZ) : :.. ~C) .
CHANNEL LOADING: 1
CALCULATED CHANNEL SLOT (k::HZ) : 4000) SITE A : WETA
CHAN DEV (KHZ): 4000 F'RE EMPHASIS CCIR SITE B: INDEPENDENT
ENGINEER: L THELANER DATE:6 JAN 86 SITE A: SITE B
--------------------------------------------------------------------
TOWER HEIGHT (FT)
MAIN ANTENNA HEIGHT (FT)
DIVERSITY ANTENNA HEIGHT (FT)
MAIN ANTENNA SIZE (FT)
DIVERSITY ANTENNA SIZE (FT)
MAIN ANTENNA GAIN (DES)
DIVERSITY ANTENNA GAIN (DB)
MAIN WAVEGUIDE LENGTH (FT)
WAVEGUIDE LOSS (WC109) 1.3 DB/100 (FT) (DB)
STACKING LOSS (DE:)
RADOME LOSS (DB)
300 ! 225
30 , 225
C) 0
49.8 ! 49.8
. C) .0 3 10 235
4.(--) ! 3.1 1.5 ! 1.5 !
.c-) .0 !
------------------------------------------ ------------------ -----
OTHER LOSSES (DES) ! .0
PATH LENGTH (MI) 25.3
SPACE LOSS (DB) I 145.6
FIELD MARGIN (LOSS) (DES) I 1.0
TOTAL LOSSES (DB) I 156.7
TOTAL GAINS (DB) ! 99.6
NET PATH LOSS (DB) 57.1
TRANSMITTEF"' OUTPUT POWER' (I)BM", C)
MEDIAN RECEIVED CARER; I ER: L-E'VE:L. (t:)I N'i) - ' :), 1
RECEIVER THRESHOLD (DBM) ! -79.0
THERMAL FADE MARGIN (DB) ! 48.9
UNAVAILABILITY ONE-WAY I . C)C)O001471 _ - - !
UNAVAILABILITY ONE-WAY SECONDS I 46.4
RELIABILITY NON DIVERSITY I 99.99985E
PATH 2 WAY UNAVAB I L_ I TY ' . 000002,942
PATH 2 WAY UNAVABILITY SECONDS ! 92.784
PATH 2-WAY RELIABILITY I 99.999706
Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
TRANSMIT SITE : WETA
RECEIVE SITE INDEPENDENT
RAIN OUTAGE METHOD U. S.
1st & 2nd RAIN RATES--- MM/YR 173 41
1st & 2nd RAIN TIMES-- MIN/YR 1. 100
L--PATH REQUENCY BAND-GHZ 11.2
DISTANCE -MI 25. 3:
FADE MARGIN IN DB : 48.9
f4ET RADOME LOSS-DB 2
POLARIZATION HORIZONTAL
F"ANNUAL RAIN OUTAGE-MINUTES/YEAR : 68.4
,POLARIZATION VERTICAL
ANNUAL RAIN OUTAGE--MINUTES/YEAR 44..E
NOTE: CALCULATIONS OF THE RAIN OUTAGES PER YEAR ARE BASED ON
EXTRAPOLATIONS OF LONG TERM RAINFALL STATISTICS. ACTUAL RAIN OUTAGES
ARE TYPICALLY SEVERAL MINUTES IN DURATION BUT MAY OCCUR ONLY ONCE
OVER A PERIOD OF SEVERAL YEARS
Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
COMSEARCH INC.
1307 GLENVILLE DRIVE
RICHARDSON, TX 75081
CUSTOMER: OVERSEAS TELECOM PATH NO: 2
SYSTEM: VIRGINIA
TYPE RADIO: MA-12G TYPE CARRIER: VIDEO
RF FREQUENCY (GHZ) 1. 2=
RECEIVER IF BANDWIDTH (MHZ): 30.
CHANNEL LOADING: 1.
CALCULATED CHANNEL SLOT (KHZ) : 4000 SITE A: WETA
CHAN DEV (KHZ) : 4000 F'RE EMPHASIS CC I R SITE B : INDEPENDENT
ENGINEER: L THELANER DATE:6 JAN 86 SITE A: SITE B
--------------------------------------------------------------------
TOWER HEIGHT
(FT) !
300 !
225 !
MAIN ANTENNA HEIGHT
(FT) !
300 !
225
DIVERSITY ANTENNA HEIGHT
(FT)
0
0
MAIN ANTENNA SIZE
(FT)
DIVERSITY ANTENNA SIZE
(FT)
0
0
MAIN ANTENNA GAIN
(DE)
48.4
48.4
DIVERSITY ANTENNA GAIN
MAIN WAVEGUIDE LENGTH
(DB)
(FT)
.0 !
310
.0
2:35
WAVEGUIDE LOSS (WC1O9) 1.1 DB/100
STACKING LOSS
(FT)
(DB)
(D8)
4.0 !
1.5
3.1
1.5
RADOME LOSS
(DB)
.0
.0
6007600 ------------------------------------ --------------
(DB) .0
PATH LENGTH (MI) ! 25.3 SPACE LOSS (DB) 145.6
FIELD MARGIN (LOSS) (DB) ! 1.0
TOTAL LOSSES (DB) 156.7
TOTAL GAINS (DB) 96.8
NET PATH LOSS (DB) 59.9
TRANSMITTER OL.tTF'UT POWER (DPM) 28.5 MEDIAN RECEIVED CARRIER LEVEL .. (D:E )
RECEIVER THRESHOLD (DBM) -79.0 THERMAL FADE MARGIN (DB) 47.6
UNAVAILABILITY ONE-WAY .000001984 UNAVAILABILITY ONE-WAY SECONDS 62.6
RELIABILITY NON DIVERSITY 99.999802
PATH 2 WAY UNAVAB I L.. I TY 000003969
PATH 2 WAY UNAVABILITY SECONDS 125.162
PATH 2-WAY RELIABILITY 99.999603 LONG HAUL. OBJECTIVE 2--WAY SECONDS 19. 900
"""""' ""' Approved For Release 2011/05/31 : CIA-RDP88-01418R000200130007-1
 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
RAINFALL OUTAGE CALCULATION
TRANSMIT SITE
RECEIVE SITE
WETA
INDEPENDENT
RAIN
,-1st
OUTAGE METHOD
Q< 2nd RAIN RATES- MM/YR
U.S.
173
41
1st
& 2nd RAIN TIMES-- MIN/YR
1
100
`-FREQUENCY BAND-GHZ 11.2
PATH DISTANCE -MI 25.3
F ADE MARGIN IN DB 47.6
F
WET RADOME LOSS-DB 2
ANNUAL : HORIZONTAL
ANNUAL RAIN OUTAGE-MINUTES/YEAR : 73
rPOL.AR I ZAT I ON VERTICAL
-ANNUAL RAIN OUTAGE-MINUTES/YEAR 48.2
:NOTE: CALCULATIONS OF THE RAIN OUTAGES PER YEAR ARE BASED ON
EXTRAPOLATIONS OF LONG TERM RAINFALL STATISTICS. ACTUAL RAIN OUTAGES
ARE TYPICALLY SEVERAL MINUTES IN DURATION BUT MAY OCCUR ONLY ONCE
OVER A PERIOD OF SEVERAL YEARS
Approved For Release 2011/05/31 : CIA-RDP88-01418R000200130007-1
 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
COMSEARCH INC.
1307 GLENV I LLE DRIVE
RICHARDSON, TX 75081
CUSTOMER: OVERSEAS TELECOM PATH NO: 1
SYSTEM: VIRGINIA
TYPE RADIO: MA-12G TYPE CARRIER: VIDEO
RF FREQUENCY (GHZ) : i . 2C -i
RECEIVER IF BANDWIDTH (MHZ): 30.
CHANNEL LOADING: 1
CALCULATED CHANNEL SLOT (KHZ): 4000 SITE A : WETA
CHAN DEV (KHZ): 4000 PRE EMPHASIS CCIR SITE B: INDEPENDENT
ENGINEER: L THELANER DATE:6 JAN 86 SITE A: SITE B
--------------------------------------------------------------------
TOWER HEIGHT
(FT) !
300 !
225 !
MAIN ANTENNA HEIGHT
(FT)
300 !
225
DIVERSITY ANTENNA HEIGHT
(FT)
0 !
0
MAIN ANTENNA SIZE
(FT)
.-A W
12
DIVERSITY ANTENNA SIZE
(FT)
0
0
MAIN ANTENNA GAIN
(DB)
49.8 !
49.8
DIVERSITY ANTENNA GAIN
(DB)
.0
.0
MAIN WAVEGUIDE LENGTH
WAVEGU I DE LOSS (WC 1.09) 1 .
OSS
. DD/100
(FT)
(FT)
(DB) !
(DB)
310
4.0 !
5 !
1
235
3.1
5
1
STACKING L
RADOME LOSS
SPACE LOSS
(DB)
(DB)
.
.0
145.6
.
.0
FIELD MARGIN (LOSS)
(DB)
1.0
TOTAL LOSSES
(DB)
156.7
TOTAL. GAINS
(DB)
99.6
NET PATH LOSS
(DB)
57.1.
TRANSMITTER OUTPUT POWER
(DBM )
26, 5
NFL) I AN RECEIVED CARRIER LEVEL.
(DE M )
-26.
RECEIVER THRESHOLD
(DBM)
-79.0
ADE MARGIN
(DB)
50
4
THERMAL F
.
----------
-
-
UNAVAILABILITY ONE-WAY
7
7000001041
UNAVAILABILITY ONE-WAY
SECONDS
32.8
RELIABILITY NON DIVERSITY
99.999896
PATH 2 WAY UNAVAB I L I TY ! . 000002083
PATH 2 WAY UNAVABILITY SECONDS 65.686
PATH 2-WAY RELIABILITY 99. 99 i'792
L
Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
TRANSMIT SITE :
RECEIVE SITE
WETA
INDEPENDENT
RAIN
1st
OUTAGE METHOD
:< 2nd RAIN RATES- MM/YR
U. S.
173
41
r-.ist
& 2nd RAIN TIMES- MIN/YR
1
100
FREQUENCY BAND-GHZ 11.2
-PATH
DISTANCE -MI
25.3
FADE
MARGIN IN DB
50.4
rWET
RADOME LOSS-DB
2
POLARIZATION HORIZONTAL
r-^ANNUAL RAIN OUTAGE-MINUTES/YEAR 62.7
,POLARIZATION VERTICAL
ANNUL RAIN OUTAGE--MINUTES/YEAR 39.6
TNOTE: CALCULATIONS OF THE RAIN OUTAGES PER YEAR ARE BASED ON
EXTRAPOLATIONS OF LONG TERM RAINFALL. STATISTICS. ACTUAL RAIN OUTAGES
ARE TYPICALLY SEVERAL MINUTES IN DURATION BUT MAY OCCUR ONLY ONCE
OVER A PERIOD OF SEVERAL YEARS
r'
L
Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
IV. SUPPORT DOCUMENTATION
2. Arlington (WETA) - Rosslyn
a. Path Data Sheets
Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
 Approved For Release 2011/05/31: CIA-RDP88-01418R000200130007-1
COMSEARCH, INC.
1307 GLENVILLE DRIVE
RICHARDSON, TX 75081
(214) 235-3156
SITE NAME
CALL SIGN
LATITUDE (DDMMSS.S)
38
53
41.13
38 53
29. 0
LONGITUDE (DDDMMSS. S)
77
4
19.0
77 7
5S.0
GND ELEV (FT AMSL) 100
365
PRIMARY ANT (FCC CODE)AD1016
AD1016
HEIGHT (FT) 130
300
LINE LOSS (DB)
TYPE
ANDREW CORPORATION
HP6-220
ANDREW CORPORATION
HP6-220
GAIN
49.7
49. 7
RADIO TYPE (FCC CODE)
2YFM01
M/A COM VIDEO SYSTEMS
2YFM01
INC M/A COM VIDEO SYSTEMS INC
BV88U4MA2 3CC
BV88U4MA23CC
POWER( DEM)
18.0
18.0
STABILITY