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520.624.1300
www.cal-av.com
Mobile Antenna / Mast Spring
Assemblies
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Mobile Antenna / Mast Spring Assemblies
For Military,
Commercial, and Amateur HF, Robotic & UGV VHF / UHF Masts
General Description
Family of CAL-AV springs. From front to rear: Mark-5, Mark-6, and Mark-7.
From left to right in each size: Threaded end, Universal Through-hole (UTH), and Mast Socket. All
versions available in mil black oxide. Contact factory for details.
"CALL REGARDING: All-316-Stainless Springs"
CAL-AV LABS produces a family of mobile antenna springs comprising the Mark-5,
Mark-6, and Mark-7. These model series represent three basic sizes: 4.65 inches high for the
Mark-5, 6.9 inches for the Mark-6, and 8.45 inches high for the Mark-7, each in its threaded-end
style. These are commercial grade springs of polished, all-stainless construction, except for the
internal tinned-copper braid, which bonds their end pieces for high frequency applications.
Each basic size includes springs of three basic styles:
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Threaded at each end, e.g. for mounting a whip antenna. Each of these
threaded-end springs has an internal tinned copper braid bond between its end pieces. Each
size has one standard thread size, plus other sizes available as options. Please see the
specifications for each size for details.
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A “Universal Through Hole” (UTH), at each end, e.g. for
mounting an antenna or mast so that a coaxial cable(s) can be passed through the spring. The
UTH end has a central hole surrounded by a pattern of 6 threaded mounting holes. This style
allows the spring to be mounted on an enclosure (e.g. for a matching or switching function)
and in turn, an enclosure, antenna, or mast can be mounted on the spring. Please see the
specifications for each size for details.
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A UTH at one end, and a Mast Socket (MSA or MSB) at the other. This allows
easy attachment of an antenna, radome, or mast directly to the spring, while allowing passage
of the coax(s), control cable(s), etc. The Mark-5 and Mark-6 spring accommodate 1-inch O.D.
masts, and the Mark-7 takes a 1.25-inch O.D. Masts are retained with set screws. Please see
the specifications for each size for details.
Specifications
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STANDARD THREADED END
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MARK-5
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MARK-6
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MARK-7
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Size / Height / Nominal Diameter
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4.65”/2.1”
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6.9”/2.8”
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8.45”/3.7”
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Weight
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2.1 lb
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4.875 lb
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10.5 lb
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Thread (Standard)
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3/8-24
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1/2-13
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5/8-18
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Thread (Available-Contact Factory)
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Up to 5/8
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3/8 to 5/8
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1/2 to 3/4
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Torque
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9 Ft.-lbs.
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39 Ft.-lbs.
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95 Ft.-lbs
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(To achieve 10-degree deflection, length measured from
bottom of spring to perpendicular load at 3 ft.)
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UTH EACH END
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MARK-5
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MARK-6
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MARK-7
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Size
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4.65” High
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6.9” High
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8.45” High
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Weight:
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2.1 lb
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4.875 lb
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10.5 lb
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Center Hole Dia.
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0.50”
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0.813”
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1.00”
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Threaded Holes
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10-32
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1/4-28
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5/16-24
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Bolt Circle Rad.
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0.660”
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0.830”
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1.100”
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Max. Thrd depth
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0.370”
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0.495”
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0.685”
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UTH / MAST SOCKET
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MARK-5
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MARK-6
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MARK-7
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Size
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4.65” High
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8.8” High
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12.0” High
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Weight
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2.4 lb
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4.8 lb
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12.1 lb
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Socket Dia.
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1.05 in.
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1.05 in.
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1.255 in.
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Socket Depth
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2.50 in.
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2.75 in.
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3.50 in.
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Set Screws
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10=32
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10-32
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1/4-28
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* MAST sockets for Mark-6 are available for mast diameters of 1.0",
1.25", 1.5" & 1.75". Consult factory for custom sockets
Mark-5 / Mark-6 Size Comparison
(Click photos to enlarge)
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At left is a matte-finish standard Mark-6 HF
antenna all-stainless spring assembly. At right is a Mark-6 based custom mast /
radome socket assembly for a military application. The low-reflectance finish on this
all-stainless spring assembly is black oxide per latest Mil-Spec. CAL-AV
welcomes inquiries regarding custom spring assemblies. |
| (STAINLESS & BLACK STAINLESS) |
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Mark-6 Mobile Antenna Spring Variants
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Mark-6 with UTH each end on left; Mark-6 with UTH on bottom,
Mast Socket on top to right. 1" diameter mast section with seven
RG-303/U cables in sleeve, illustrates through-hole capability.
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Mark-6 with mast in socket above, UTH below, mounted on a
SINCGARS adapter plate, which is in turn mounted on a vehicular
SINCGARS mount.
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Underside of vehicular SINCGARS antenna mount and underside of
SINCGARS to Universal Through-Hole (UTH) Adaptor Plate, showing
safety-wired 1/4-28 bolts.
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Close-up of safety-wired 1/4-28 bolts holding Mark-6 UTH base to
SINCGARS adapter plate.
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Prices: (Single Piece Prices Shown)
Mark-5 Prices:
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Mark-5-Standard, 3/8-24 threaded end
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$164
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Mark-5 - Threaded end, 3/8 Through 5/8
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$ Call
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Mark-5 UTH5-UTH5, Universal Through-Hole Each End
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$273
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Mark-5 UTH5-MSA5, Universal Through-Hole Mast Socket
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$281
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Mark-5 Custom
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$ Call
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Mark-6 Variants Prices
| Mark-6 - Standard, 1/2-13 Thread each end, Internal
braid |
$372 |
| Mark-6-1, 3/8-24 Thread each end, Internal braid |
$ Call |
| Mark-6-2, 1/2-13 Thread bottom, 3/8-24 thread top, Internal braid |
$ Call |
| Mark-6-3, 5/8-11 Thread each end, internal braid |
$ Call |
| Mark-6-UTH6-UTH6, Universal Through-Hole Mounting Each End |
$438 |
| Mark-6-UTH6-MSA6, Universal Through-Hole Mounting on bottom,
Mast Socket for 1" diameter mount on top |
$471 |
| Mark-6-UTH6-MSB6, Universal Through-hole Mounting on bottom, Mast
Socket "B" for 1.25" diameter mast on top |
$495 |
| Mark-6-UTH6-MSC6, Universal Through-hole Mounting on bottom, Mast
Socket "C" for 1.50" diameter mast on top |
$518 |
| Mark-6-UTH6-MSD6, Universal Through-hole Mounting on bottom, Mast
Socket "D" for 1.75" diameter mast on top |
$542 |
Mark-7 Variants Prices
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Mark-7-Standard, 5/8-18 Thread each end,
Internal braid
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$884
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Mark-7-UTH7-UTH7 Universal Through-Hole
Each End
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$996
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Mark-7-UTH7-MSB7 Universal Through-Hole and
Mast Socket "B" for 1.25" diameter mast
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$983
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Mark-7-CUSTOM
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Contact
Factory
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Adapter Plates Prices
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SINCGARS Mount (6” diameter, nominal, 4 holes, 0.438 dia., 90
degrees apart on 4.5-inch bolt circle),
1/4” Thick 6061-T6 Aluminum, Chem-Coat, ready to prime and paint:
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APS-0.375: .250-AL, 3/8” hole at center to mount standard Mark-5
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$89
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APS-0.5: .250-AL, 1/2” hole at center to mount standard Mark-6
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$89
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APS5-UTH: .250-AL, to mount Mark-5 UTH5 pattern spring end
NOTE: UTH5 is a 0.500 through-hole, surrounded by a pattern of 6 clearance
holes for 10-32 screw, every 60 degrees on a 0.660 bolt-circle radius.
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$104
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APS6-UTH: .250-AL, to mount Mark-6 UTH6 pattern spring end
NOTE: UTH6 is a 0.750 through-hole, surrounded by a pattern of 6 clearance
holes for 0.25” bolt, every 60 degrees on a 0.830 bolt-circle radius.
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$104
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| APS-BLANK: .250-AL, BLANK, with 0.125 pilot hole at center |
$89 |
Also available: Pairing plates; allows pairing two springs side-by-side
to double spring constant fore-and-aft, while virtually eliminating side
motion. Stainless steel. Intended for mounting on a trailer hitch. Contact
factory for details.
Information Sheets
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Voice: 520.624.1300 | Email: Info@cal-av.com
CAL-AV LABS, INC.
1985 North El Moraga Drive
Tucson, AZ 85745-9070
Mobile Antenna / Mast Spring Assemblies
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