CAL-AV Labs, Inc.

Quality Engineering Solutions Since 1959

Voice: 520.624.1300 Fax: 520.624.1311


520.624.1300

www.cal-av.com

 

 


Mobile Antenna Springs

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.
"COMING SOON: All-316-Stainless Marine Spring Line"

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:

    1. 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.

    2. 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.

    3. 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

    STANDARD THREADED END

    MARK-5

    MARK-6

    MARK-7

    Size / Height / Nominal Diameter

    4.65”/2.1”

    6.9”/2.8”

    8.45”/3.7”

    Weight

    2.1 lb

    4.875 lb

    10.5 lb

    Thread (Standard)

    3/8-24

    1/2-13

    5/8-18

    Thread (Available – Contact Factory)

    Up to 5/8

    3/8 to 5/8

    1/2 to 3/4

    Torque

    9 Ft.-lbs.

    39 Ft.-lbs.

    95 Ft.-lbs

    (To achieve 10-degree deflection, length measured from bottom of spring to perpendicular load at 3 ft.)

     

     

     

     


    UTH EACH END

    MARK-5

    MARK-6

    MARK-7

    Size

    4.65” High

    6.9” High

    8.45” High

    Weight:

    2.1 lb

    4.875 lb

    10.5 lb

    Center Hole Dia.

    0.50”

    0.813”

    1.00”

    Threaded Holes

    10-32

    1/4-28

    5/16-24

    Bolt Circle Rad.

    0.660”

    0.830”

    1.100”

    Max. Thrd depth

    0.370”

    0.495”

    0.685”

     

     

     

     

     

    UTH / MAST SOCKET

    MARK-5

    MARK-6

    MARK-7

    Size

    4.65” High

    8.8” High

    12.0” High

    Weight

    2.4 lb

    4.8 lb

    12.1 lb

    Socket Dia.

    1.05 in.

    1.05 in.

    1.255 in.

    Socket Depth

    2.50 in.

    2.75 in.

    3.50 in.

    Set Screws

    10=32

    10-32

    1/4-28

     

     

     

     

    * 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

    Mark-5 and Mark-6 Commercial grade mobile antenna springs
    (Click photos to enlarge)

    Mark-5 and Mark-6 Commercial grade mobile antenna springs   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 MIL-DTL-13924, CLASS 4.  CAL-AV welcomes inquiries regarding custom spring assemblies.
    (STAINLESS & BLACK STAINLESS)    

    Mark-6 Mobile Antenna Spring Variants

    Mobile Antenna Springs: MK-6-UTH-UTH-AND-MK-6-UTH-MAS

    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.

    MK-6-UTH--MSA-ON-SINCGARS-ADA.jpg

    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.

    Mobile Antenna Springs: vehicular SINCGARS antenna mount and underside of SINCGARS to Universal Through-Hole (UTH) Adaptor Plate

    Underside of vehicular SINCGARS antenna mount and underside of SINCGARS to Universal Through-Hole (UTH) Adaptor Plate, showing safety-wired 1/4-28 bolts.

    Safety-wired 1/4-28 bolts holding Mobile Antenna Spring Mark-6 UTH base to SINCGARS adapter plate.

    Close-up of safety-wired 1/4-28 bolts holding Mark-6 UTH base to SINCGARS adapter plate.

    Prices: (Single Piece Prices Shown)
    Mark-5 Prices:

    Mark-5 – Standard, 3/8-24 threaded end

    $99

    Mark-5 Threaded end, 3/8 Through 5/8

    call w/quant.

    Mark-5 UTH5-UTH5, Universal Through-Hole Each End

    $145

    Mark-5 UTH5-MSA5, Universal Through-Hole Mast Socket

    $165

    Mark-5 Custom

    $ Call

     

     

     

     

    Mark-6 Variants Prices

    Mark-6 – Standard, 1/2-13 Thread each end, Internal braid $ 225
    Mark-6–1, 3/8-24 Thread each end, Internal braid $ 235
    Mark-6–2, 1/2-13 Thread bottom, 3/8-24 thread top, Internal braid $ 235
    Mark-6–3, 5/8-11 Thread each end, internal braid $ Call w/qty
    Mark-6–UTH6–UTH6, Universal Through-Hole Mounting Each End $265
    Mark-6–UTH6–MSA6, Universal Through-Hole Mounting on bottom, Mast
    Socket “A” on top.
    $285
    Mark-6 - UTH6 - MSA6, Universal Through-hole Mounting on bottom, Mast Socket "A"  for 1.00" diameter mast on top $285
    Mark-6 - UTH6 - MSB6, Universal Through-hole Mounting on bottom, Mast Socket "B"  for 1.25" diameter mast on top $300
    Mark-6 - UTH6 - MSA6, Universal Through-hole Mounting on bottom, Mast Socket "C"  for 1.50" diameter mast on top $310

     

     

     

     

     

     

     

    Mark-7 Variants Prices

    Mark-7 Standard, 5/8-18 Thread each end, Internal braid

    $ 535

    Mark-7UTH7 – UTH7 Universal Through-Hole Each End

    $ 585

    Mark-7UTH7 – MSB7 Universal Through-Hole Mast Socket

    $ 595

    Mark-7 – CUSTOM

    Contact
    Factory

     

     

     

     

    Adapter Plates Prices

    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, Alodined, ready to prime and paint:

    APS-0.375: .250-AL, 3/8” hole at center to mount standard Mark-5

    $72

    APS-0.5: .250-AL, 1/2” hole at center to mount standard Mark-6

    $72

    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.

    $84

    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.

    $84

    APS-BLANK: .250-AL, BLANK, with 0.125 pilot hole at center $72

     

     

     

     

     

     

     

    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 | Fax: 520.624.1311

    CAL-AV LABS, INC.
    2440 N. Coyote Dr, STE 116
    Tucson, AZ 85745 USA

    info@cal-av.com


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