RF Antenna FAQs

/RF Antenna FAQs
RF Antenna FAQs 2018-05-23T04:13:20+00:00


Find answers to Frequently Asked Questions about Sinclair Technologies systems in the categories below.  For further assistance, please contact us.

How to Choose a Clamp

This guide lists the Sinclair clamps available for most standard antenna installations. Each column identifies one or more clamps by the Sinclair number and indicates whether these are suitable for use with round support pipes or tower legs, 60 degree angles, 90 degree angles, or other mounting situations. For ease of reference, similar antennas are grouped together, as are similar  clamps. An extensive range of non-standard mounting hardware is also available  on a special order basis.  If you have any other requirements or need further  assistance, consult your Sinclair representative. Before ordering clamps or mounting hardware for your particular requirement,  consider whether a professional review of all relevant factors is necessary. The information contained in this document is provided for reference only: the customer is responsible for compliance with all applicable engineering and safety standards and regulations. Click here to download the Sinclair Clamp and Side Mount Selection Guide.

Sinclair Antenna Naming Convention

Download a pdf version here.

1 Purpose 1.1 It provides a product coding system that can be used to create universal     product numbers for Sinclair Antennas, eliminating any discrepancies or     inconsistencies in the product codes previously used in U.S.A, EMEA and Canada. 1.2 It strives to eliminate any ambiguity in product naming in order to further     reduce the likelihood of shipping the wrong product. 2 DEFINITIONS 2.1 SKU Stock Keeping Unit 3 NAME STRUCTURE The complete name structure has four components and it is comprised with the     following code designations:

1 2 3 4
Series/Config. Identifier SKU Variant Identifier Options List P.I.
‘S’ AT FR Ser Cf ‘-‘ ER FS P PR Cx ‘(‘ EE Tf MC E# ‘-‘ MO ‘)‘ “X”

Component #1: Series/Configuration Identifier Component #2: SKU     Variant Identifier Component #3: Options List (or “E-number”) Component #4: Prototype Identifier (P.I., optional) Example: A complete product name for an exposed dipole, VHF, with specific     options looks as follows:

Antenna Requirements: Exposed dipole
Two dipole elements
Heavy duty
VHF (138-174MHz)
¼ Wavelength
Low noise
Four degree downtilt
Din female connector
Includes lightning spike
1 2 3 4
Series/Config. Identifier SKU Variant Identifier Options List P.I.
‘S’ AT FR Ser Cf ‘-‘ ER FS P PR Cx ‘(‘ EE Tf MC E# ‘-‘ MO ‘)‘ “X”
S D 2 12 H F2 P4 L DF ( D04 LS )

3.1.1 Series/Configuration Identifier “S”: The names of all Sinclair antennas start with “S” AT: Antenna Type     (collinear omni, exposed dipole, yagis, etc.) FR: Frequency Range (100 MHz –     299 MHz, 300 MHz – 599 MHz, etc.) Ser: Antenna Series (eg; 21 = Excaliber     mobiles, 80 = high-gain omnis) Cf: Antenna Configuration (fixed vs field-adj,     2-bay vs 4-bay, etc.) 3.1.2 SKU Variant Identifier “-”: Separates the Series/Configuration Identifier from the SKU Variant     Identifier ER: Environmental Rating (standard duty or heavy duty) FS:     Frequency Split (split code or centre frequency or TB1, etc.) P: Pattern or     Wavelength (eg: offset vs bi-directional, ½ wave vs ¼ wave) PR: PIM Rating     (standard noise rating or PIM-enhanced) Cx: Connector (BNC – female, TNC –     male, etc.) 3.1.3 Options List The Options List may contain the following elements: “(”: Signifies the     beginning of the Options List – mandatory EE: Electrical Elevation (uptilt or     downtilt in degrees) – optional Tf: Tune frequency – optional MC: Mounting     Configuration (side mount, end mount, etc.) – optional E#: A special assembly     “E-number” – optional < MO: A string of characters signifying one or more     miscellaneous options (paint colour, high power, etc.) – optional “)”:     Signifies the end of the Options List – mandatory 3.1.4 Prototype Identifier An engineering prototype constructed for customer acceptance testing is further     designated by the character “X” following the Options List. X: Prototype     identifier 3.2 DEFINITIONS OF NAME STRUCTURE ELEMENTS 3.2.1 “S” : Names of all antennas start with “S” for “Sinclair”. Single alphabetic character. Value is always upper case “S”. This portion of the     name is mandatory. 3.2.2 AT : Antenna Type Single alphabetic character, always upper case. This portion of the name is     mandatory.

B K T train, truck, etc. (excaliber)
C collinear omni L low-profile mobile U parabolic, circular reflector
D exposed dipole M mobile V corner reflector
E enclosed dipole N W
F O X dual polarity “slant 45” panel
G ground plane P single polarity panel Y yagi
I in-building R

Note: For dual-band antennas (eg. dual 312/212 dipole antenna) use forward slash between the two frequency range designators, placing first the frequency range that is implemented higher up the mast. (eg. SD312/212D-SF2/F2P2S(…). 3.2.3 FR : Frequency Range Single numeric character. This portion of the name is mandatory.

1 <100MHz
2 100MHz – 299MHz
3 300MHz – 599MHz
4 600MHz – 999MHz
5 1000MHz – 2000MHz

3.2.4 Ser : Antenna Series Two numeric characters. This portion of the name is mandatory.

01 ground plane (101, 201, 301, 401) 34 69 collinear omni (369)
02 corner reflector (302, 402) 35 2-bay exposed dipole (235, 335) 70 cellular/panel (470)
03 3 element yagi (203, 303) 36 71
04 37 72
05 38 omni (238) 73
06 6 element yagi (206, 406) 39 74
07 7 element yagi (307) 40 data antenna (440) 75
08 41 data antenna (441) 76
09 42 77
10 1-bay exposed dipole (210, 310) 43 78
11 2-bay enclosed dipole (411) 44 79
12 2-bay exposed dipole (212, 312) 45 80 phasor collinear omni (480)
13 46 81 corporate feed collinear omni (481)
14 4-bay exposed dipole (214, 314) 47 82 mobile 1/2wave
14 4-bay enclosed dipole (414) 48 83 mobile 5/8wave
15 yagi (415) 49 84
16 50 yagi (250, 350) 85
17 low-gain omni-directional (217) 51 86
18 8-bay exposed dipole (218, 318) 52 87
19 9-bay enclosed dipole (419) 53 88 phasor collinear omni (488)
20 collinear omni (320, 420) 54 89 short phasor collinear omni (489)
21 excaliber mobiles (221, 321) 55 90 wide-band collinear omni (490)
21 collinear omni (421) 56 91
22 2-bay exposed dipole (222) 57 92
23 coil collinear omni (323) 58 93
24 4-bay exp. dipole (224) 59 94
25 marine omni (225) 60 radaflector (260, 360, 460) 95
26 61 96
27 corner reflector (227) 62 97 phasor collinear omni (497)
28 corner reflector (228) 63 98
29 coil collinear omni (229, 329) 64 99
30 tetra panel (330) 65 00 excaliber mobiles (500)
31 66
32 67
33 phasor collinear omni (233) 68

3.2.5 Cf : Configuration Single alphanumeric character. This portion of the name can be left blank only     for the dominant configuration variant for the product, or if there are NO     configuration variants anticipated for the product.

2 dual bay. Single input cable
4 four bay. Single input cable
D dual array. Two separate input cables
L low profile
M marine version (gen. 156 – 162.5 MHz)
Q quad array. Four separate input cables
R radome
T triple array. Three separate input cables

3.2.6 “-“ : Separator inserted to enhance readability This separator distinguishes the series/configuration, being the level at which     family-level marketing collateral is likely to be generated for the majority of     products, from the variants defined by frequency splits, etc. This separator is     mandatory. 3.2.7 ER : Environmental Rating Single alphabetic character. This portion of the name is mandatory.

S Standard duty
H Heavy duty
U Ultra duty

3.2.8 FS : Frequency Split Two, three, four, or five alphanumeric characters. This portion of the name is     mandatory. Use “FX” if no frequency splits exist or are anticipated for the     product, or a specific frequency is required as per 7.2.14. Note that frequency     split codes (and even the logic behind the codes) may vary between antenna     series. For simplicity, antennas that existed prior to this naming convention     will use the same frequency split codes (or centre frequencies) that were used     previously. Where “*” preceded the frequency split code, it is replaced with     “F”.

FX No frequency splits exist or are anticipated for this product
FN Where n = (1 – 99) designating the frequency split code. Care should be taken to     assign codes sequentially
T1 TETRA band 1. Covers at least 380MHz – 400MHz. (TETRA-oriented products only)
T2 TETRA band 2. Covers at least 410MHz – 430MHz. (TETRA-oriented products only)
TB Covers both Tetra bands, 380-430MHz

Note: For dual-band antennas, place a forward slash between the Frequency Split     designators, using the same sequencing used in the Frequency Range designator. 3.2.9 P : Pattern or Wavelength Two alphanumeric characters. This portion of the name is mandatory, unless no     pattern or wavelength variants are anticipated.

nn Azimuth beamwidth in degrees where nn = (30 – 99) (panels and other sectored     antennas only)
P2 1/2 wave (fixed-pattern exposed dipoles and whips only)
P3 3/8 wave (fixed-pattern exposed dipoles only) (no longer available, except as     possible special assembly)
P4 1/4 wave (fixed-pattern exposed dipoles only)
P5 5/8 wave (mobile whip antennas only)
PA Field adjustable pattern, or beamwidth
PC Circular polarized
PS Cross polarized, or Slant

3.2.10 PR : PIM Rating Single alphabetic character. This portion of the name is mandatory.

L Enhanced PIM rating
S Standard PIM rating

3.2.11 Cx : Connector Two alphabetic characters. This portion of the name is mandatory. Connector     variants listed below do not apply to all antenna products.

BF BNC female SF SMA female
BM BNC male SM SMA male
DF 7/16 DIN female TF TNC female
DM 7/16 DIN male TM TNC male
NF N female UF UHF female
NM N male UM UHF male

3.2.12 “(“ : Start of options list This separator distinguishes the product name being the level at which a separate     bill of materials is likely to be required from the options list. The options     list (and therefore this separator) is mandatory because the connector is     specified in the options list, and it is always necessary to specify the     connector. 3.2.13 EE : Electrical Elevation Three alphanumeric characters. This portion of the name can be left blank, only     if the concept of electrical elevation is not applicable to the product series     (e.g.; yagis, corner reflectors).

Dnn Electrical downtilt in degrees where nn = (00 – 10)
Unn Electrical uptilt in degrees where nn = (00 – 10)

Note: For dual downtilt antennas use forward slash between the two downtilt     designators, placing first the downtilt that is implemented higher up the mast.     (eg. SC421-SFXSNF(D0/3.5) 3.2.14 Tf : Tune Frequency Five alphanumeric characters. This portion of the name is only mandatory for     all narrow-band antennas that have to be tuned to a specific frequency.

F0 Untuned. T/B tuned by the Customer
Ff Where f = (0300 – 9995), designating the centre frequency (1/2MHz increments) in     MHz with 1 decimal point. Example: For a SC229 antenna ordered with centre     frequency of 138.5 MHz, the “Ff” designator will be: F1385

3.2.15 MC : Mounting Configuration Single alphabetic character. The mounting configuration is relative to the     antenna, not to the tower. This portion of the name should be used if there is     more than one mounting configuration.

B Bottom mount (Antennas mounted from the bottom of the antenna).
C Centre mount
E End mount
I Inverted
S Side mount
U Universal (Could be mounted in more than one of the above-mentioned     configuration, depending on the type of antenna).

3.2.16 E# : Special Assembly Identifier (“E-number”) Five alphanumeric characters, “E” followed by four digits. Presence of an     “E-number” indicates that the product is a “special assembly”. Occasionally the     customer supplied unique drawing number or part number may be used in place of     the E number. See “Special Assemblies” for details. This portion of the name     will (of course) be omitted for all standard/stocked and standard/non-stocked     products. 3.2.17 “-“ : Separator inserted to enhance readability This separator distinguishes the basic options from the less common     “miscellaneous options”. It is inserted to enhance readability. This separator     is mandatory if the product has miscellaneous options. 3.2.18 MO : Miscellaneous Options This will be a string (of arbitrary length) composed of sequences of two or three     alphanumeric characters. This portion of the name is optional. The sequence of     elements is not critical, but it is recommended that the following sequence be     observed for enhanced readability. Miscellaneous options listed below are not     available for all antenna configurations.

BC Bird cap
Cx Where x = (0 – 99) designating cable length (in feet) if other than standard.     This code must not been used for ordering jumper cables.
CG Coast guard
HP High-power version (Note: special assembly: should be assigned an E-number     instead?)
IC Integrated ice-guard version (Note: special assembly: should be assigned an     E-number instead?)
LM Less mast
LS Integrated lightening spike version
LV Low-VSWR version (Note: special assembly: should be assigned an E-number     instead?)
EBK Color finish – black epoxy paint
EBU Color finish – blue epoxy paint
EWH Color finish – white epoxy paint
EGR Color finish – gray epoxy paint
PBK Color finish – black polyurethane paint
PBU Color finish – blue polyurethane paint
PWH Color finish – white polyurethane paint
PGR Color finish – gray polyurethane paint
PSB Color finish – shadow bronze paint
CGO Color finish – gold chromate
ABK Color finish – black anodizing
ABU Color finish – blue anodizing
AGO Color finish – gold anodizing
TBK Color finish – black teflon
TWH Color finish – white teflon
TBU Color finish – blue teflon
TGR Color finish – gray teflon
CWH Radome material color – white (radome material color for products such as the     excaliber and panel antennas)
CGR Radome material color – gray (radome material color for products such as the     excaliber and panel antennas)
Sinclair Antenna Wind Loading Standards

The below listed standards and methods are used to calculate the Survival Wind Velocity and all other related moments, stresses and deflections:

TIA Document

Telecommunications Industry Assoc., Minimum Standards for Communications Antennas, Base Station Antennas.

TIA-329-C (August 2003)

Rated Wind Velocity-The Rated Wind Velocity and Loading for antennas is calculated using industry standard TIA-329-C. The calculation for rated wind velocity determines the maximum wind velocity at which the mechanical stresses in the antenna are below the yield point of the materials by a safety factor of not less than 1.65 as specified in 5.1.2 of the standard.

Rated Wind Velocity calculated using this methodology is the wind speed at which an antenna can endure sustained exposure without failure.

Survival Wind Velocity- The calculation for Survival Wind Velocity determines the maximum wind velocity at which the mechanical stresses in the antenna components are just below the allowable yield strength of the mast, boom and dipole material.  Survival Wind Velocity calculated using this method is the wind speed at which an antenna cannot endure sustained exposure over longer periods of time without experiencing some degree of material deformation or malfunction.  Inspection after the survival wind speeds is recommended.

Notes on how to calculate flat plate equivalent areas and horizontal wind thrust for antennas specified in Sinclair published catalogues. FPE is defined as the flat plate area that would result in the same wind load as the antenna under the same wind condition. To determine the flat plate equivalent area is to multiply the drag coefficient by two thirds of the projected area of a structural member.

1) The Flat Plate Equivalent Area, ft²: FPE= Cd 2/3 A, published value.
Where: FPE, is the Flat Plate equivalent Area, ft² 2/3, conversion factor for flat surfaces areas. A, is the projected area Cd, is the drag coefficient. The standard values for drag coefficients, CSA-37-94:     For round members Cd=1.0     For flat plates Cd=1.5

Note: The drag coefficient is difficult to determine, it varies with the shape, aspect ratio and surface roughness of the antenna or its structural members. Published text book or data from standard associations i.e. CSA-37, TIA/EIA may be used for this calculation, however the most reliable drag coefficients are experimentally determined by wind tunnel trails. For the selection of the drag coefficient Sinclair makes use of both sources.

2) Calculation of Horizontal Thrust or Wind Load (W):
The horizontal thrust or wind loading is the product of the flat plate equivalent area (FPE) and the wind velocity pressure (P) which is expressed in pound force, Lbf.
Calculating the Wind Load acting on Antennas:
W= P (FPE), in Lbf.
Where: P, is the wind velocity pressure in pounds per square foot, lb/ft² FPE, is the Flat Plate Equivalent Area, ft² (see paragraph 1)
Calculating the wind velocity pressure, TIA-329C:
P=KV2, in lb/ft²
Where: K, is the wind conversion factor, a nominal value of K for pressure on the projected areas of flat surfaces is 0.0042. V, is the stated maximum wind velocity in miles per hour, mph.