THE BIRO TECHNICAL BULLETINS 
MAY 2006


THE BIRO TV RECEPTION STUDIES

When the US Army decides to organize a task force with a mission, the commanding officer wants to find out as much information (intelligence) as possible about the strength, disposition and armament of the enemy.The same is true when the CATV chief technician or the head-end engineer is given the task of relocating the CATV antenna tower or adding High Definition Broadcast TV stations to the channel line-up.He needs over-the-air TV reception related technical information such as:

The above information is presented by the Biro Reception Study in the following formats and segments.

COMPUTER RUNS

SIGNAL DIRECTION SHEETS

*** COMPUTER AIDED TV RECEPTION STUDY ***
 
BIRO ENGINEERING
PRINCETON, NEW JERSEY
SITE: HOBOKEN, GA.
COORDINATES: 31/10/7    82/7/12
DIST
CHAN
CALL
LOCATION
STATE
NETWK
DTV
POWER
OFST
HAAT
AZIMUTH
LEVEL
POLAR
MILES
kW
FT
DEGS
dBmV
27.02
18
WXGA
WAYCROSS*
GA.
ED
X
20.0
0
938.
277.9
-7.1
H
27.02
8
WXGA
WAYCROSS
GA.
ED
316.0
+
1030.
277.9
11.4
H
32.53
24
WPXC
BRUNSWICK
GA.
PAX
X
500.0
0
1371.
136.3
4.8
H
32.53
21
WPXC
BRUNSWICK
GA.
PAX
5000.0
+
1371.
136.3
15.0
H
40.51
34
WGSA
SAVANNAH
GA.
UPN
316.0
0
482.
351.1
-1.7
H
41.64
35
WGSA
SAVANNAH*
GA.
UPN
X
35.0
0
443.
351.3
-13.9
H
67.99
48
WFXU
LIVE OAK*
FL.
WBN
X
1000.0
0
381.
231.3
-35.6
H
68.01
57
WFXU
LIVE OAK
FL.
WBN
2500.0
-
443.
231.3
-30.5
H
69.45
7
WJCT
JACKSONVILLE
FL.
ED
270.0
0
991.
151.8
-11.1
H
69.45
32
WAWS
JACKSONVILLE
FL.
FOX
X
1000.0
0
955.
151.8
-17.9
H
69.45
38
WJCT
JACKSONVILLE
FL.
ED
X
1000.0
0
945.
151.8
-18.8
H
69.45
30
WAWS
JACKSONVILLE
FL.
FOX
4000.0
+
1007.
151.8
-10.5
H
69.83
19
WTEV
JACKSONVILLE
FL.
CBS
X
1000.0
0
915.
151.8
-17.5
H
69.85
47
WTEV
JACKSONVILLE
FL.
CBS
5000.0
-
981.
151.8
-12.5
H
69.88
44
WJEB
JACKSONVILLE
FL.
ED
X
715.0
0
771.
151.7
-25.8
H
69.88
59
WJEB
JACKSONVILLE
FL.
ED
3311.0
0
944.
151.7
-16.5
H
69.90
17
WJWB
JACKSONVILLE
FL.
WBN
4680.0
0
1000.
151.6
-8.8
H
69.90
34
WJWB
JACKSONVILLE
FL.
WBN
X
863.0
0
924.
151.6
-20.0
H
70.22
13
WTLV
JACKSONVILLE
FL.
NBC
X
25.0
0
1017.
151.2
-23.2
H
70.37
42
WJXT
JACKSONVILLE
FL.
IND
X
976.0
0
961.
151.3
-20.1
H
70.38
4
WJXT
JACKSONVILLE
FL.
IND
100.0
+
960.
151.3
-9.4
C
70.38
12
WTLV
JACKSONVILLE
FL.
NBC
316.0
+
970.
151.3
-12.7
C
73.61
43
WSWG
VALDOSTA*
GA.
UPN
X
50.0
0
830.
270.5
-40.2
H
73.61
44
WSWG
VALDOSTA
GA.
UPN
1700.0
-
909.
270.5
-23.1
H
73.69
9
WVAN
SAVANNAH
GA.
ED
316.0
-
1050.
23.5
-13.7
H
73.69
13
WVAN
SAVANNAH*
GA.
ED
X
20.0
0
961.
23.5
-27.9
H
75.99
27
WTGS
HARDEEVILLE
S.C.
FOX
X
1000.0
0
1493.
36.9
-14.5
H
75.99
28
WTGS
HARDEEVILLE
S.C.
FOX
5000.0
-
1500.
36.9
-7.5
H
76.06
15
WTOC
SAVANNAH
GA.
CBS
X
422.0
0
1381.
36.3
-18.8
H
76.06
11
WTOC
SAVANNAH
GA.
CBS
316.0
0
1470.
36.3
-11.2
H
76.70
23
WJCL
SAVANNAH*
GA.
ABC
X
200.0
0
1355.
36.6
-24.2
H
76.70
22
WJCL
SAVANNAH
GA.
ABC
3830.0
0
1430.
36.6
-9.9
H
77.83
25
WJXX
ORANGEPARK
FL.
ABC
5000.0
0
659.
166.1
-26.9
H
77.83
10
WJXX
ORANGEPARK
FL.
ABC
X
11.1
0
1007.
166.1
-32.5
H
78.01
39
WSAV
SAVANNAH
GA.
NBC
X
1000.0
0
1450.
38.0
-18.8
H
78.16
3
WSAV
SAVANNAH
GA.
NBC
100.0
+
1450.
37.9
-10.5
H

All Jacksonville analog and HDTV UHF stations, Channel 17-19-30-32-34-38-42-49-59 are received from the same direction.The application of high gain parabolic antennas is strongly recommended.

The same technique should be applied to receive CH 15-22-23-27-28-38, Savannah, Ga.

To demonstrate our flexibility, here is the same 80 mile radius computer run, displaying only HDTV stations.

*** COMPUTER AIDED TV RECEPTION STUDY ***
 
BIRO ENGINEERING
PRINCETON, NEW JERSEY
SITE: HOBOKEN, GA.
COORDINATES: 31/10/7    82/7/12
DIST
CHAN
CALL
LOCATION
STATE
NETWK
DTV
POWER
OFST
HAAT
AZIMUTH
LEVEL
POLAR
MILES
kW
FT
DEGS
dBmV
27.02
18
WXGA
WAYCROSS*
GA.
ED
X
20.0
0
938.
277.9
-7.1
H
32.53
24
WPXC
BRUNSWICK
GA.
PAX
X
500.0
0
1371.
136.3
4.8
H
41.64
35
WGSA
SAVANNAH*
GA.
UPN
X
35.0
0
443.
351.3
-13.9
H
67.99
48
WFXU
LIVE OAK*
FL.
WBN
X
1000.0
0
381.
231.3
-35.6
H
69.45
32
WAWS
JACKSONVILLE
FL.
FOX
X
1000.0
0
955.
151.8
-17.9
H
69.45
38
WJCT
JACKSONVILLE
FL.
ED
X
1000.0
0
945.
151.8
-18.8
H
69.83
19
WTEV
JACKSONVILLE
FL.
CBS
X
1000.0
0
915.
151.8
-17.5
H
69.88
44
WJEB
JACKSONVILLE
FL.
ED
X
715.0
0
771.
151.7
-25.8
H
69.90
34
WJWB
JACKSONVILLE
FL.
WBN
X
863.0
0
924.
151.6
-20.0
H
70.22
13
WTLV
JACKSONVILLE
FL.
NBC
X
25.0
0
1017.
151.2
-23.2
H
70.37
42
WJXT
JACKSONVILLE
FL.
IND
X
976.0
0
961.
151.3
-20.1
H
73.61
43
WSWG
VALDOSTA*
GA.
UPN
X
50.0
0
830.
270.5
-40.2
H
73.69
13
WVAN
SAVANNAH*
GA.
ED
X
20.0
0
961.
23.5
-27.9
H
75.99
27
WTGS
HARDEEVILLE
S.C.
FOX
X
1000.0
0
1493.
36.9
-14.5
H
76.06
15
WTOC
SAVANNAH
GA.
CBS
X
422.0
0
1381.
36.3
-18.8
H
76.70
23
WJCL
SAVANNAH*
GA.
ABC
X
200.0
0
1355.
36.6
-24.2
H
77.83
10
WJXX
ORANGEPARK
FL.
ABC
X
11.1
0
1007.
166.1
-32.5
H
78.01
39
WSAV
SAVANNAH
GA.
NBC
X
1000.0
0
1450.
38.0
-18.8
H

* indicates under construction

Observe the large variation in HDTV output power.1000 kW for Channel 19, Jacksonville, but only 50 kW for Channel 43, Valdosta, resulting in a 20 dB reduction in the project signal level.

The second segment of the computer-run focuses on co-channel interference possibilities.The search is available for every VHF and UHF channel, covering a 400 mile radius.

CHAN CALL LOCATION
STATE
NTWK
DTV
POL
POWER
OFST
HAAT
DIST
AZIMUTH
kw
FEET
DEGS
DESIRED STATION                   
13 WTLV JACKSONVILLE
FL.
NBC
X
H
25.0
0
1017.
70.22 MI 151.2    
CO-CHANNEL CALCULATION               
13 WVAN SAVANNAH*
GA.
ED
X
H
20.0
0
961.
73.69 MI 23.5
13 WRCB CHATTANOOGA
TN.
NBC
X
H
34.8
0
1099.
331.48 MI 327.1
13 WPEC W. PALM BEACH
FL.
CBS
X
H
31.0
0
955.
336.35 MI 159.5

The co-channel interference print-out for Channel 13, WTVV, Jacksonville displayed all potential offenders in increasing distance order.The dominant interfering station, Channel 13, Savannah was found at almost the same distance as the desired,. indicating a potential interference situation.

In this case the installation of a custom-tailored phased-array seems mandatory.

SIGNAL DIRECTION SHEETS

The objective of the computer developed SIGNAL DIRECTION SHEETS is not to promote artistic quality or advances in computer science.Signal Direction Sheets present the Compute Runís technical information in a convenient visual format, helping the on-site verification testing of co-located stations, assisting the survey engineer during the on-site verification testing.The search for the desired and undesired (interfering) stations will be performed faster and with greater accuracy.

Computer developed Signal Direction Sheets have a tremendous flexibility.They can be developed:

ALL ANALOG AND HDTV STATIONS WITHIN 100 MILES

Note that all Jacksonville stations to be receive from the same direction, while. the Savannah stations arrive from three (3) different directions.

ALL HDTV STATIONS WITHIN 75 MILES

All Jacksonville HDTV stations received from the same direction,offering a single antenna solution.

 

A potential Channel 34 co-channel interference situation demonstrated by the Signal Direction Sheet above.

The reception of Channel 24, WPXC-DT, Brunswick may not be absolutely free of adjacent channel interference, arriving from two directions.

CONCLUSION

It is time to move into the 21-st century with computer based, fast and comprehensive data search programs. The results (literally) just a click away.The study can be sent electronically via the Internet to your desktop in minutes, not in days or weeks, or in a more traditional delivery form, the printed version by FedEx, arriving the next morning.

It is true thatother (free) TV reception studies are available on the WEB.But there is no comparison in the wealth of information and particularly special signal direction sheets, coming very handy during an on-site signal survey.

Biro Engineering is not sponsored by the Ford Foundation, the study is not free. Quality technical services require reasonable compensation.

The computer projected signal levels are based on 10 element Yagis,installed at 30' above ground, assuming:

Computer aided studies cannot detect or project interference,generated by high-voltage transmission lines, power-line transformers, mobile radio services, vehicular and airplane- traffic, CB radios, second harmonics of FM stations, and last but not least ghosting.

Costly mistakes can be avoided by verifying the projected signal levels and possible interference conditions at your tower site.Biro Engineering offers cost-effective on-site signal verification surveys, providing factual signal level and picture quality information of the desired channels, as well as identifying co-channel, electrical, RF interference and ghosting difficulties.An antenna bill of material and tower sketch is an integral part of the Biro Study.


For emergency engineering services:
Call: (609) 883-9866
E-mail: steven@biroengineering.com
Web site: www.biroengineering.com

Biro Engineering
P.O.BOX 2175
PRINCETON, N.J. 08543