MV3A Mobile Antenna System
General Information
MV3A has 4 band capability—2m/6m, plus 2 HF bands though use of loading coils. The MV3A is supplied with HVC28 (10m) loading
coil. There are four optional HF coils available: HVC7 (40m), HVC14 (20m), HVC18 (17m), and HVC21 (15m). The MV3A has a foldover structure which allows for entrance into parking structures (i.e. garages, buildings, etc.). Use DIAMOND model MX62M Duplexer
for single antenna operation with ICOM IC-706, Yaesu FT100 or for combining HF & VHF transceivers.
Specifications
Bands Supplied 10m/6m/2m
Power, PEP: HF 120 watts / VHF 200 watts
Mount Connection: UHF
Length: 58” (with the HVC7 installed, total length is 80”)
VSWR: 1.5:1 Nominal–MV3A (10m/6m/2m)
Frequency: 2m: 144.5-148 MHz; 6m: 52-54* MHz;
(Nominal BW) 10m Loading Coil: 28-29 MHz (± 300 Khz)
HVC7 (40m): (± 28 Khz)
HVC14 (20m): (± 60 Khz)
HVC18 (17m): (±140 Khz)
HVC21 (15m): (± 180 Khz)
*6MSSB-EXT (6m SSB) (± 500 Khz)
Element Phasing: 5/8O 2m, 1/4O 6m
Recommended Antenna Mounts: Diamond K400C or K600M
Recommended Duplexer: Diamond MX62M
Installation Instructions
PRECAUTIONS:
(1) The MV3A requires vehicle ground.
(2) If installing HVC7 (40m) loading coil, install on top (vertical position) only. Some installations may require a nylon
cable to relieve stress on vehicle mount.
(3) The MV3A 6m/2m tuning assumes that at least one loading coil is mounted at the top end. VSWR may be out of
specification without the coil(s).
(1) Choose desired mounting location to insure maximum strength of mount, best performance of antenna, and
proper vehicle ground.
(2) Assemble MV3A with desired loading coil (HVC28
10m coil is included in package) and install on vehicle mount.
NOTE: Metric Hex wrenches are enclosed.
(3) With quality VSWR meter, check VSWR on all bands
to insure proper tuning of antenna. The loading coil rods
may require adjusting or trimming to reach best VSWR. If
it is necessary to trim coil rods, do so in 1/8” increments
only, until lowest VSWR is obtained at desired center frequency. Shortening coil rods will have the effect of raising
the resonant frequency. Check both the high and low band-
width edges before cutting.
Discharge Protection Cap
—10m Coil
MV3A Parts List
Trim element with cutting device appropriate for cutting
metal. (i.e. Hacksaw, etc.)
Metric Hex Wrench M4
(4) When tuning optional loading coils (HVC7, HVC14, HVC18,
HVC21 and HVC28-10m coil), install on the top (vertical position) and
proceed to tune the coils by adjusting or trimming coil rods. (NOTE: HVC
Tuning Coils have a limited tuning range–refer to “frequency” under specifications for bandwidth). Choose your desired center frequency as a guide
for tuning range and adjust for best VSWR at center frequency.
(5) Once you have adjusted all coils for best VSWR in the vertical position, you may assemble one optional coil horizontally. All coils can work
horizontally except the HVC7 (40m); it must be in the vertical position due
to its size. The VSWR will change slightly by adding a coil horizontal; therefore, it is best to check your VSWR readings to verify tuning.
— 40m
—20m
HVC Loading Coils
—17m
—15m
—10m
(6) To replace loading coils, simply unscrew coil from coil support
bracket and replace with another coil (see illustration). Be sure loading
coils are fastened securely so they don't loosen from vehicle and road
vibration.
(7) The MV3A has a fold-over structure for situations where the
antenna height is a problem (see illustration). Simply unscrew the
fold-over lock, lift up, and tilt over 90°. Care should be taken when
folding over, not to damage vehicle or any loading coils. Do not
drive with antenna in the folded position.
MV3A Accessory Items
MX62M Duplexer
LPF 1.6-56; HPF 76-470
Power; 200w CW, 600w PEP
Connectors: Mix-UHF(F);
Ports-UHF(M)
w/12” cable
K400C
Trunk/Hatchback Mount
Deluxe UHF type base
Dual-axis adjustable
6½” RG316 Teflon Coax
w/PL-259.
Use Diamond Model C110
for front radio installations.
K600M
Trunk Mount
Deluxe trunk mount.
16.5' RG188 and 7mm 5D Coax.
Tilt Angle (0-9°)
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