Sirio Antenne SMA 55-550, SMA 108-550, MGA 55-550, MGA 108-550 Installation Manual

TUNING INSTRUCTIONSTUNING INSTRUCTIONS

MATCHING & BANDWIDTH DIAGRAMSMATCHING & BANDWIDTH DIAGRAMS

SMA 55-550 SMA 108-550

SMA 55-550 SMA 108-550

VHF Mobile Antennas 55...550 MHz or 108...550 MHz Stainless steel whip

HI-QUALITY ANTENNAS MADE IN ITALY

B Copyright SIRIO antenne - Technical Data are subjected to change - Printed in ITALY - Rev. 15/06/2006 - Cod. ID369

DESCRIPTIONDESCRIPTION

1/4 l mobile antennas covering the frequency range of 55...550 MHz or 108...550 MHz by using
the enclosed cutting diagram. SMA series is made of 17/7 PH stainless steel rod and supplied with
“SL”, “S” mount (from 55 up to 300 MHz) or “N” mount (from 55 up to100 MHz).

SPECIFICATIONSSPECIFICATIONS

Electrical Data

Type : 1/4 l
Frequency Range : SMA 55-550 from 55 to 550 MHz tunable by cutting

: SMA 108-550 from 108 to 550 MHz tunable by cutting

Impedance : 50 W
Radiation : Omnidirectional
Polarization : Linear Vertical
Gain : 0 dB ref. to a l/4 whip
Bandwidth @ SWR £ 2 : see diagram (”SL” mount)
SWR @ res. freq. : see diagram (”SL” mount)
Max Power : 100 Watts
Standard Mount : “SL”, mounting hole Æ 19 mm, cable 5m RG 58 (55...550 MHz)
Alternative Mount : “S”, mounting hole Æ 19 mm, cable 5m RG 58 ( 55...300 MHz only)

: “N”, mounting hole Æ 12.5 mm, cable 4m RG 58 (55..100MHz only)

Mechanical Data

Materials : Stainless Steel 17/7 PH, Nylon, Chromed Brass
Height (approx.) : SMA 55-550 1360 mm

: SMA 108-550 720 mm

Weight (approx.) : 400 gr

TUNING INSTRUCTIONSTUNING INSTRUCTIONS

108 MHz Start frequency

for SMA 108-550 L=640

L

MOUNT INSTALLATIONSMOUNT INSTALLATIONS

"S” Mount"SL" Mount

A

Æ 39 mm

Æ 1”-1/2

“SL” MOUNT REMARK: Be careful during installation do not use too much strenght but tighten the
metal ring A by means of the suitable tool. TIGHTENING TORQUE: 4 Nm ± 10%

PRECAUZIONE PER BASE “SL”: Porre attenzione durante l'installazione. Non serrare con troppa forza ma
avvitare l'anello metallico A utilizzando la chiave adeguata. COPPIA DI SERRAGGIO: 4 Nm ± 10%

ID369

Æ 42 mm

Æ 1”-3/5

"N" Mount

Æ 41 mm

Æ 1”-3/5

NOTE:

! Use the curves just as a guide. For fine-

tuning please use an SWR-Meter.