Mobile Antenna Springs: Military, Commercial, and Amateur HF, Robotic & UGV VHF / UHF Masts

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Mobile Antenna Springs

For Military, Commercial, and Amateur HF, Robotic & UGV VHF / UHF Masts

General Description

The Mark-5 is a commercial grade antenna spring of polished, all-stainless construction, except for the internal tinned-copper braid, which bonds its end pieces. The Mark-5 is 2" in diameter by just under 5" long, with ham-standard 3/8-24 threaded hole in each end.

The Mark-6 is also all-stainless, except for the internal tinned-copper braid, which bonds its end pieces. It is an exceptionally heavy-duty spring intended for very large whips and remotely tuned antennas. Owing to strength requirements, it is threaded 1/2-13 on both ends. Additionally, these threads are equipped with locking set screws. Contact factory for variations to accommodate thru-coaxial cable, etc.

Click to enlarge

SPECIFICATIONS	MK-5	MK-6
SIZE:	4.65" High	6.9" High
WEIGHT:	2.1 lb.	4.875 lb.
TORQUE:	9 ft. lbs.	39 ft. lbs.
(To achieve 10-degree deflection, length measured from bottom of spring to perpendicular load at 3 ft.)
THREADS:	3/8-24	1/2-13
Pricing Info, FOB Tucson, AZ	$89.00	$225.00

Mark-5 Mobile Antenna Spring Variants

(Click photos to enlarge.)

Family of CAL-AV's Universal Through Hole (UTH) and
Mast Socket size A (MSA) springs;
Left to Right: Mk-6-UTH, Mk-5 UTH, Mk-5 MSA, and Mk-6 MSA.
Mast Socket size A fits a 1-inch O.D. mast or radome.

Mark-5 UTH5-UTH5	$105
Mark-5 UTH5-MSA5	$110
Mark-5 Custom	$ Call

Mark-6 Mobile Antenna Spring Variants

(Click photos to enlarge.)

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.

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.

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

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

Mark-6 Variants and Accessories

Mark-6–1, 3/8-24 Thread each end, internal braid	$ Call w/qty
Mark-6–2, 1/2-13 Thread bottom, 3/8-24 thread top, internal braid	$ Call w/qty
Mark-6–3, 5/8-11 Thread each end, internal braid	$ Call w/qty
Mark-6–UTH6–UTH6, Universal Through-Hole Mounting each end	$245
Mark-6–UTH6–MSA6, Universal Through-Hole Mounting on bottom, Mast Socket “A” on top.	$265
Adapter Plates SINCGARS Mount (6” diameter, nominal, 4 holes, 0.438 dia., 90 degrees apart on 4.5-inch bolt circle), ¼” 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	$40
APS-0.5: .250-AL, ½” hole at center to mount standard Mark-6	$40
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.	$50
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.	$50
APS-BLANK: .250-AL, BLANK, with 0.125 pilot hole at center	$40

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

info@cal-av.com