Antenna Parts & Accessories
Home Page Antennas Transmitting Variable Inductors
 
 
Transmitting Variable Inductors

La Pointe Pancake Inductor
0.1 - 6 µH

(IRV) 420-1
La Pointe pancake inductor. 0.1 - 6 µH. 5-1/2" square mounting plate. Sunair P/N: 6032-1062-09. A one of a kind item!!
 

Variable Inductor
0.1 - 40 µH
2-10 kw Power Handling
Taper Wound Front End • Silver Plated Edge Wound Coil
(IRV) RI-40
  • Description
  • Details
  • More Info

It's here at last! The ultimate variable inductor. Isn't your tuner or amplifier project worth the very best? Made exclusively for Surplus Sales of Nebraska.

0.1 - 40 µH variable edge wound inductor. Taper wound lower end (higher Q) for better results beyond 20 MHz. Enough inductance for work below 160 meters too. All RF surfaces are thick silver plated. Quad 10 amp contact sets on all rotating connections; coil to rotor; rotor to shaft armature; shaft armature to to end plate contacts. There are no weak links with our mil-spec design.

Perfect for 2-10 kw antenna tuners, tank network for amplifier or anywhere a larger, high Q, variable inductance is required. Be sure to use our turns counter (SHW) TCV. 5" wide, 5-1/4" high, 12-1/2" end to end, maximum dimensions. 1/4" shaft. Optional end stop kit for motor drive schemes. Add $35 for kit, P/N: (IRV) RI-40ESK
*** SOLD OUT ***
 
(IRV) RI-40ESK
Optional end stop kit for motor drive schemes.
$479 each
 
$35 each

Roller Inductor
0 - 15 µH
(IRV) 3852
Barker & Williamson 3852 roller inductor. 0 - 15 µH. Silver plated roller. 1/4" x 3/8" long shaft. 4-3/4" x 3" x 6". Fits Collins 30S-1.
 

Motorized Roller Inductor
18 µH
(IRV) 640333
Motorized roller inductor. 18 µH. 12 vdc reversible motor with limit switches. Requires 13 sec to go end to end. 10 turn, 10k ohm pot coupled to motor to indicate position to external sense circuit. Roller tap tied to frame ground. Easily removed. Ceramic form - end plates. 5" x 7" x 4" high. Removed from new, unused SRS SR-640 tuner. NOTE: This is the same size inductor used in Lew McCoy's ultimate transmatch.
$165 each
 
$295 each

Motorized Roller Inductor
0.1 - 28 µH
(IRV) 406-32-M
Motorized roller inductor. 0.1 to 28 µH. with 12 vdc reversible motor with limit switches. Requires 10 sec to go end to end. 10 turn, 10k ohm pot coupled to motor to indicate position to external sense circuit. Attached PC board contains TIP140 Darlington transistors that drive the motor. Use an external 10 turn pot and TTL logic to compare with the on-board pot to control the on-board motor drivers. Roller tap tied to one end of the coil and the "N" female input connector. Easily removed. Output lead is spade lug female on lead. Ceramic form - end plates. 5-1/2" x 8-3/8" x 6" high. NOTE: This is the inductor used in the SRS-645, 1 kw tuner shown on this page. LaPoint 406-32; same as Johnson 229-203.
 

Roller Inductor
0.2 - 50 µH
(IRV) GCU1935
Roller inductor. Internal pinch roller design. 0.2 - 50 µH, 5 kw, 10 amps. Coil: 36 turns, 3/32" x 1/2" wide silver plated edgewound copper, 5-1/4" diameter. Coil is 0.094” thick. 5 turns per inch, 9" long. 4-1/2" diameter - 72XL037 sprocket on drive-end for motor. 3/8" shaft. 6" diameter x 15" long overall dimensions. Brand new!!
$395 each
 
$349 each

Gates Edgewound Inductor
1 - 17 µH
(IRV) 17-VC-15V4
Gates edgewound inductor. 1 - 17 µH, 20 amp. 3/8" shaft. Removed and old. (1950's). 6" x 11"L x 6-1/2"H.
 

Edge Wound Variable Inductor
35 µH
(IRV) RI-35
35 µH, edge wound silver coil, opposing gripper contact arrangement for reliable service year after year. 40 turns.
4" x 5-5/8" long x 4-1/4" high. 1/4" shaft.
$265 each
 
$145 each

Silver Coil
28 µH
(IRV) ALSIMAG
Silver Coil. 28 µH. Made in the 1940's. Ceramic form. Two separate contact points. 1/4" shaft. 3-1/2" x 3-1/2" x 7"L.
 

Roller Inductor Replacement
Wheel & Bar

(IRV) K57J58-G1
Roller inductor replacement wheel & bar. Silver roller with ball bearings inside!! Ribbon wire tie-offs on end. 1-3/16" diameter wheel made for 1/8" diameter inductor wire. Made by G.E. in 1945. 7-3/4"L x 3/16" diameter shaft.
$95 each
 
$15 each

Variable Inductor
12 µH
(IRV) RI-12
All silver plated. Looks like it should handle 20 - 30 kw. 8 turns 3/8" diameter tube coil. 3/8" shaft coupling included. 9" diameter x 13" long. Excess from SRS. Only a few left.
 

Roller Inductor Wheel
(IRV) 7809266P2
Westinghouse roller inductor wheel. Silver plated bronze. TPE transmitter spare. 0.938" diameter. 0.863" inner groove diameter. 0.2" bore diameter. 0.5" long. Westinghouse item 284, 293.
$325 each
 
$9.75 each

Core Roller Inductor
3 - 35.8 µH
(IRV) 2434
Nice ceramic core roller inductor. Shaft end has slot to mate with nylon quick coupling (shown right) which fits 1/2" shaft. Little or no previous use. Electrical connections are made to ribbon conductors opposite shaft end. Mounts on bottom with 4 screws, 2 in each of the green composite end plates. 3" x 3-1/2" x 5-1/2". Composite RF material. Stand alone frame, silver plated kilowatt roller coil, as new, removed from (IRV) 503178 auto tuners found in Vacuum Variable section.
$99 each
 

Sliding slotted coupling mates with female on end of inductor and automatically recovers from missalignment
Close-up of slotted shaft on end of inductor.
Close-up of 1/2" diameter female end of nylon
coupling that is supplied with 2434.

Roller Coil
4 - 20 µH
(IRV) N16C-76423
Surplus heavy duty ceramic core roller inductor. 8-1/2" maximum length, 4-3/8" x 5" high. 1/4" shaft two ends. Should handle 3,000 watts.
 

Square Edgewound
Wire Inductor / 0.5 - 11 uH @ 20 amps
(IRV) 226-005-22
Identical to left but 10" max. length. 3/8" shaft. Includes 30 kv, 1/4" shaft coupling. Made by Multronics, Inc.
$175 each
 
*** SOLD OUT ***
 

Adjustable Inductor
23 µH
(COL) 544-5984-003
Adjustable inductor on 1" x 3" ceramic coil form has 23 µH total inductance. Graduated scale marked "3-45" turns.

Collins surplus. Shorting wheel on slider selects tap.
 

Motorized Rotary Inductor
25 µH
(COL) 635-9851-004
Collins / Rockwell motorized rotary inductor. 25 µH. Handles 500w to 1 kw. 1/8" diameter gold plated inductor. 27.5 vdc motor drive. 20k, 10 turn pot attached for high resolution position indication. Maximum dimensions 6-3/8" high x 5-1/4" wide x 8" long. Complete with Collins acceptance tag. Brand new in the box.
$325 each
 
*** SOLD OUT ***
 

Gear Motor
24 vac / 28 rpm

(IRV) B00003
Gear motor for operating rotary switches. 24 vac, 28 rpm. It has a spring loaded pawl that retracts when power is applied and engages when power is removed to stop the motor. Plenty of torque due to gear reduction. NOT REVERSIBLE.

Mounted in a 4-1/4" x 3-1/2" x 5"H aluminum frame with mounting tabs. Motor measures: 2-5/8" x 3-1/4" x 4". 1/4"D shaft.
 

70 rpm Loaded Speed
Reversible Gear Motor
(MOT) B00005
24 vac (50 / 60 Hz) operated motor is used in the SRS Antenna Couplers to tune inductors, switches and vacuum caps.

Healthy torque manages any component in their line. 70 rpm at 24 vac 60 Hz, with full rated load. Lower voltage to lower speed also decreases torque. Double 1/4" shaft exits each side of gearbox. Mounts by threaded post sockets on front spaced in a 1-9/16" square.

Max dimensions 3-3/4" high x 2-7/8" wide x 3-1/2" deep from mounting posts to electrical terminals on back. MK Model QFS3420R. Includes starting cap and wiring instructions.

Limited quantity!
Suitable for almost any remote tuning
application of a vacuum cap, rotary
inductor or ceramic switch.
$59 each
 
$79 each
 

Motorized Edge Wound
Variable Inductor
0.3 - 40 µH
(IRV) 77935
Our last coil has modified motor with high torque. 14-28 vdc motor control with end stops. 5k, 20 turn Bourns pot has been attached to side in order to monitor rotor position. This mil-spec design will handle 5 kilowatts easily. All silver plating on the edge wound inductor which measures 0.3-40 µH.

5" wide x 11" long x 7" high. 34 turns, 5" diameter, 6" long coil.
 
 
$495 each