Transmitting Variable Inductors

High-End, Military Grade Coil and Capstan Style Variable Inductor
0.3 µH - 150 µH / 1.6 - 30 MHz / 160 - 10 Meters
(IRV) L150CC
High end, Military grade Coil and Capstan Style Variable Inductor. Operation similar to Collins 180L-1 antenna tuner's inductor which is used in the Bliss Match Master. Silver plated beryllium copper band is wound from insulated core to silver plated shorting capstan core. The difference between this type of variable inductor and a "roller inductor" is that there are no unused windings hanging in the circuit like you have on the back side of a roller coil. The unused windings all short out to the silver drum, presenting a perfect coil to the RF circuit. In a balanced tuner, you will need two of these coils and they should be driven together, in tandem, with a timing belt to a gear motor.

Add a vacuum cap that we can also help with and an enclosure, gear motors ( and misc parts and you will have one heck of a tuner. Or add our turns counters ( for a manual set up. Granted the 150µH is excessive for wire Vee antennas in the ham bands but this was originally designed for a mobile whip requiring mucho inductance. Factory power rating is 150 watts but I will add the ribbon is larger than the one used in the Collins 180S-1. Users of the Bliss Match Master swear they use their tuner on legal limit amps with no problem... ever!

The fact is two-thirds of the coil will probably not be used. End stop switches are mounted and provisions to mount a ten-turn pot for indicator circuitry are included. This is the highest quality variable inductor available on a limited basis at a fraction of the original cost.
  • 0.3 µH - 150 µH
  • 1.6 - 30 MHz
  • 160 - 10 Meters
  • Dimensions: 19"L x 8"W x 7-1/4"H
$1,397 each
Roller Inductor
0.1 - 20 µH / 2 kw
(IRV) GE20
General Electric roller inductor. 0.1 - 20 µH, 2 kw. 36 turns on 2" ceramic form. Includes 10 kv ceramic flex coupling and crank knob. 3" x 3-1/4" x 6-1/4" (to front) or 8-1/4" overall length with knob. NOTE: Broken / repaired corner on ceramic end plate.
Ultra Heavy Duty Roller Inductor
5 kw / 0.5 - 25 µH / 22 amps
(IRV) RI-25
Ultra heavy duty roller inductor. 5 kw, 0.5 - 25 µH, 22 amps. 14 turns - 6-1/2"D coil. 8"H x 7-3/4"W x 11-1/2" overall length. 0.185"W x 0.25" inductor winding.
*** SOLD OUT ***
Roller Inductor
0.1 - 18 µH
(IRV) 406-2
La Pointe roller inductor. 0.1 - 18 µH, 2 kw. Silver coil. Tapered winding. 2-1/2" x 2-3/4"H x 6-1/4"L. Only one available.
Motorized Roller Inductor
18 µH
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.
$295 each
Edgewound Roller Inductor
17 µH / 5 kw
(IRV) EW17
Vintage edgewound roller inductor. Silver coil. 17 µH, 5 kw. Includes turns counter and 20 kv flexible ceramic shaft coupling. 4"W x 6"H. 10"L coil. 13" overall length.
Roller Inductor
28 µH
(IRV) GE28
Vintage roller inductor. Silver coil. 28 µH. Includes 40-turn counter. 3" x 3-1/4" x 9" overall length. Circa 1940's. Only one available.
*** SOLD OUT ***
Spherical Link - Coupled Coil
Spherical link - coupled coil. Silver plated coils of 10 AWG copper wire. Each half of the fixed coils are (3+) turns, 3.5" outside diameter at center of sphere, spaced @ 1/4". Coils are both wound to maintain constant spacing as rotor is turned. Rotating sphere is 3" outside diameter on center line, 7-1/2 turns. Measures 3" x 4-1/2" x 5"H.
$150 each

RF Grade Fiberglass Grooved Spool

RF grade fiberglass grooved spool. Non-linear spacing. Silver endposts. 2-7/8"D x 4-1/2"L winding area.
$25 each

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!!
*** SOLD OUT ***

Gates Edgewound Inductor
1 - 17 µH

Gates Edgewound Inductor
(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.
*** SOLD OUT ***

Edge Wound Variable Inductor
35 µH

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. Edgewound ribbon coil. 4" x 5-5/8" long x 4-1/4" high. 1/4" shaft. New old stock, unused.
*** SOLD OUT ***

Roller Inductor
0.1 - 6 µH

(IRV) RI-6
Collins roller inductor with insulated coupling. 0.1 - 6 µH. 4" x 2-3/8" x 2-3/8". 19/32" x 1/4"D shaft. Collins P/N: 546-6435-002.
*** SOLD OUT ***

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" x 3/16" diameter shaft.
$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.
*** SOLD OUT ***

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.
$9.75 each

Roller Coil
0.4 - 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.
*** SOLD OUT ***

Edgewound Roller Inductor
23 µH / 10 amps / Tapered Winding

(IRV) 226-1-1
Cardwell / Johnson edgewound roller inductor. 23 µH, 10 amps, tapered winding. High current rotor contacts. Silver plated. 3/8" shaft on each end. 13-1/2"L x 4"W x 6-5/8"H.

Gear Motor
24 vac / 28 rpm

(IRV) B00003
Brevel Products 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.

$59 each

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.

$79 each

Variable Inductor End Stop Kit

End stop kit for (IRV) RI-40 previously sold by Surplus Sales
$35 each