Sirio Antenne MGA 55-550 User manual

MGA 55-550 MGA 108-550
VHF Mobile Antennas 55...550 MHz or 108...550 MHz Stainless steel and spring
MGA 55-550 MGA 108-550
BCopyright SIRIO antenne - Technical Data are subjected to change - Printed in ITALY - Rev. 15/06/2006 - Cod. ID376
HI-QUALITY ANTENNAS MADE IN ITALY
MATCHING & BANDWIDTH DIAGRAMSMATCHING & BANDWIDTH DIAGRAMS
TUNING INSTRUCTIONSTUNING INSTRUCTIONS

TUNING INSTRUCTIONSTUNING INSTRUCTIONS
ID376
L
NOTE:
!Use the curves just as a guide. For fine-
tuning please use an SWR-Meter.
MOUNT INSTALLATIONSMOUNT INSTALLATIONS
“SL” MOUNT REMARK: Be careful during installation do not use too much strenght but tighten the
metal ring Aby 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 Autilizzando la chiave adeguata. COPPIA DI SERRAGGIO: 4 Nm ± 10%
DESCRIPTIONDESCRIPTION
1/4 lmobile antennas covering the frequency range of 55...550 MHz or 108...550 MHz by using
the enclosed cutting diagram. MGA series is made of 17/7 PH stainless steel rod and stainless steel
spring. They are supplied with “SL” , “S” mount (from 55 up to 300 MHz) or “N” mount (from 55 up
to 100 MHz).
SPECIFICATIONSSPECIFICATIONS
Electrical Data
Type : 1/4 l
Frequency Range : MGA 55-550 from 55 to 550 MHz tunable by cutting
: MGA 108-550 from 108 to 550 MHz tunable by cutting
Impedance : 50 W
Radiation : Omnidirectional
Polarization : 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
Feed System / Position : Direct / Base
Standard Mount : “SL”, mounting hole Æ19 mm, cable 5m RG 58 (55...550 MHz)
Alternative Mount : “S”, mounting hole Æ19 mm, cable 5m RG 58 ( 55...300 MHz only)
: “N”, mounting hole Æ12.5 mm, cable 4m RG 58 (55..100MHz only)
Mechanical Data
Materials : Stainless Steel 17/7 PH, Nylon, Chromed Brass
Height (approx.) : MGA 55-550 1400 mm
: MGA 108-550 705 mm
Weight (approx.) : 420 gr
A
Æ1”-1/2
Æ39 mm
"S” Mount"SL" Mount
Æ1”-3/5
Æ42 mm
"N" Mount
Æ1”-3/5
Æ41 mm
108 MHz Start frequency
for MGA 108-550 L=606