SGC SG-303 User Manual

SG-303/307 WHIP ANTENNA MANUAL
© SGC 2007
HIGH PERFORMANCE HF SSB ANTENNA FOR MARINE AND MOBILE USE
ITEM # 55-27: SG-303 W/ MOUNT / ITEM # 55-67: SG-303 W/O MOUNT
ITEM # 55-28: SG-307 W/ MOUNT / ITEM # 55-69: SG-307 W/O MOUNT
DESCRIPTION
The SG-303 and the SG-307 are designed to radiate efficiently at HF frequencies from 2-30 MHz.
Both antennas provide reliable long range communications. Their short length permits
communication from a vehicle in motion (60 MPH or 100 KPH speed maximum). The antennas
must be used with an antenna coupler (SG-230 or any coupler with a similar specification).
SPECIFICATIONS
Specification
SG-303
SG-307
Maximum Input Power.
500 Watts PEP or CW
150 Watts PEP or CW
Operating Range.
2-30 MHz
2-60 MHz
Primary Loading Resonance:
11 Mhz
8 Mhz
Secondary Loading Resonance
22 MHz
25 MHz
Mounting
High Voltage, 4-way
Ratchet
High Voltage, 4-way
Ratchet
Ratchet mount material:
Stainless Steel
Stainless Steel
Maximum vehicle or boat speed:
60 MPH/100 KPH
(when erect)
60 MPH/100 KPH
(when erect)
Radiation:
Omnidirectional
Omnidirectional
Shipping weight:
10 pounds
8 pounds
Maximum total height:
9 feet
7 feet
Maximum shipping length
4.5 feet
7.5 feet
ITEMS SUPPLIED
1. Loaded whip antenna (in two sections of 4 ft each for the SG-303)
2. 3 iinch, high voltage Delron insulator
3. 4-way stainless steel ratchet mount
4. Special SGC heavy duty, rubber encapsulated base spring
5. 3 ft. of high voltage wire, one end terminated by a ring lug
6. High voltage wall feed-through bushing (hole = .890 inch)
7. 3 ft of ¾ inch wide braided copper ground strap for coupler grounding
8. 12 releaseable tie wraps
9. Lug to connect high voltage wire to coupler
10. Manual

SGC SG-303 Specifications

General

Brand	SGC
Model	SG-303
Category	Antenna
Language	English

Summary

Product Description

Antenna Specifications

Vehicle Installation Guide

Installation with Antenna Coupler

Details on connecting the coupler to the antenna base, emphasizing high voltage wire clearance and coupler placement.

Poor Vehicle Installation Locations

Illustrates detrimental mounting positions for antennas on vehicles, affecting radiation and causing noise.

Vessel Mounting Instructions

Small Power Boat Mounting

Guidance for mounting antennas on small power boats, suggesting deck placement with the coupler underneath.

Small Boat Fishing Tower Mounting

Instructions for mounting on a fishing tower, ensuring coupler proximity and proper tower bonding to metal structures.

Boat Hull Installation

Metal-Hulled Speed Boat Installation

Utilizing the boat's metal structure for ground purposes in speed boat installations.

Fiberglass-Hull Speed Boat Installation

Mounting on the bow of fiberglass boats, using ground straps to the engine for RF grounding.