Ferrite rods are made up of special ceramic magnetic materials wherein the magnetic molecules (domains) have the ability to align freely with external magnetic fields. The result is a powerful gain in strength (amplification) of the received radio signal but without adding any electronic "hiss" noise. Its sort-of like a pre-amplifier but requires no external power except for the incomming signals.
We have long thick ferrite rods for use in your specialized radio receiver or transmitter. These are not the brittle thin ferrite rods that break easy that you might be familliar with. Our ferrite rods are made with a plastic coating to help prevent breakage and provide a smooth non-abrasive electrically insulating winding surface.
We have 2 magnetic permeability values of ferrite rods: 125u and 2000u.
125u is a general use material that works at very low frequency, low frequency, medium frequency, and high frequency.
2000u is a material that works at extremely low frequency, super low frequency, ultra low frequency, very low frequency, and low frequency.
We have ferrite rods in lengths from 4.5 inches long to 27 inches long.
Our 125u ferrite rods are for use in the range of 10 KHz - 30 MHz. (VLF, Longwave, AM, Shortwave). It will also work very well down to 1000 Hz in longer (over 20 inches) lengths!
Our 2000u ferrite rods are for use in the range of 0 Hz - 500 KHz. (ELF, SLF, ULF, VLF, LF, MF).
All of our plastic ferrite rods are weather-proof and water-proof and they resist shattering due to the plastic casing.
Benefits of our plastic coated ferrite rods:
Won't break in two if stressed.
No rough edges that could cut your wires.
No electrical short-circuit to the ferrite (loss of "Q").
Weather-proof and Water-proof.
Environment will not contaminate ferrite quality.
Clean to handle: your hands and equipment won't get dirty.
Smooth clean white plastic surface gives high contrast so you can easily see your wire work.
Plastic case is about 1/8th inch thick. Your antenna coil is electrically insulated from the ferrite for slightly higher "Q".
Plastic case outside diameter is about 1 and 3/8ths inches.
Ferrite rod material diameter is a THICK 1 inch to allow transmitting and receiving.
Circumferance: Holds 4.25 inches of wire per turn. (Example: 100 turns requires 35.416 feet of wire).
125u Plastic Ferrite Rods
High "Q" ferrite rods made from premium ferrite material.
These 125u ferrite rods are for use in the 10 KHz to 30 MHz range. It will also work well down to 1000 Hz in lengths over 20 inches long.
This ferrite rod offers excellent narrow band (high "Q") reception.
This ferrite rod is for use in super-sensitive antennas, especially the AM broadcast band 530 KHz - 1710 KHz, and in the VLF and longwave bands below 530 KHz.
Shorter lengths (under 10 inches) are generally useful for antennas, coupling and small sensors.
Longer lengths (over 15 inches) are useful for very low frequency applications down to 1 KHz.
Chart shows recommended frequency range of 125u ferrite rods.
Outer Circumferance: Holds 4.25 inches of wire per turn.
Length of case: Outer case length is approximately 1.25 inches longer than Ferrite Length.
Ferrite Technical Properties Charts
U.S.A. only. No Foreign Orders.
125u
Part # | Ferrite Length | Ferrite Outside Diameter | Ferrite Weight | Test Frequency * | Test Inductance ** | Resistance per turn at 1000 Hz | Resistance per turn at 120 Hz | __Price |
| VFR4M | 4.5 in | 1.0 in |
6 oz | - | - | - | - | $ 15.00 |
| VFR5M | 5.6 in | 1.0 in |
8 oz | - KHz | - uH | - | - | $ 18.75 |
| VFR6M | 6.7 in | 1.0 in |
10 oz | - KHz | - uH | - | - | $ 22.50 |
| VFR7M | 7.8 in | 1.0 in |
12 oz | - KHz | - uH | - | - | $ 26.25 |
| VFR9M | 9.0 in | 1.0 in |
14 oz | - KHz | - uH | - | - | $ 30.00 |
| VFR10M | 10.1 in | 1.0 in |
1 lb 0 oz | 500 KHz | 663 uH | 0.56338: | - | $ 33.75 |
| VFR11M | 11.2 in | 1.0 in |
1lb 2 oz | - KHz | - uH | - | - | $ 37.50 |
| VFR12M | 12.3 in | 1.0 in |
1 lb 4 oz | 475 KHz | 730 uH | 0.68943: | - | $ 41.25 |
| VFR13M | 13.5 in | 1.0 in |
1 lb 6 oz | - KHz | - uH | - | - | $ 45.00 |
| VFR14M | 14.6 in | 1.0 in |
1 lb 8 oz | - KHz | - uH | - | - | $ 48.75 |
| VFR15M | 15.7 in | 1.0 in |
1 lb 10 oz | - KHz | - uH | - | - | $ 52.50 |
| VFR16M | 16.8 in | 1.0 in |
1 lb 12 oz | 444 KHz | 833 uH | 0.89690: | 0.01939 | $ 56.25 |
| VFR18M | 18.0 in | 1.0 in |
1 lb 14 oz | - KHz | - uH | - | - | $ 60.00 |
| VFR19M | 19.1 in | 1.0 in |
2 lb 0 oz | - KHz | - uH | - | - | $ 63.75 |
| VFR20M | 20.2 in | 1.0 in |
2 lb 2 oz | - KHz | - uH | - | - | $ 67.50 |
| VFR21M | 21.3 in | 1.0 in |
2 lbs 4 oz | - KHz | - uH | - | - | $ 71.25 |
| VFR22M | 22.5 in | 1.0 in |
2 lbs 6 oz | - KHz | - uH | - | - | $ 75.00 |
| VFR23M | 23.6 in | 1.0 in |
2 lbs 8 oz | - KHz | - uH | - | - | $ 78.75. |
| VFR24M | 24.7 in | 1.0 in |
2 lbs 10 oz | - KHz | - uH | - | - | $ 82.50 |
| VFR25M | 25.8 in | 1.0 in |
2 lbs 12 oz | - KHz | - uH | - | - | $ 86.25 |
| VFR27M | 27.0 in | 1.0 in |
2 lbs 14 oz | - KHz | - uH | - | - | $ 90.00 |
Prices subject to change without notice. All sales final (So you know you're getting a brand new ferrite rod, not a used or pre-owned one, thank you!).
Shipping/Handling charges are extra, depends on weight and size of box at actual time of shipping.
* Test Frequency is for example: When a coil of wire is wound and centered on the rod: 71 turns of # 22 copper wire and a 151 pF capacitor is used for resonating the coil.
** Test inductance is measured when a coil of wire is wound and centered on the rod: 71 turns of # 22 copper wire.
***Ohms per turn is measured with 71 turns of # 22 wire wound on the center of the rod. Test frequency is 1000 Hz and 120 Hz.
2000u Plastic Ferrite Rods
Low Frequency ferrite rods made from premium ferrite material.
These 2000u ferrite rods are for use in the 0 Hz to 500 KHz range, works best below 200 KHz.
This ferrite rod offers highest "Q" below 200 KHz.
Learn more about VLF here
Shorter lengths (under 10 inches) are generally useful for antenna coupling and small sensors.
Longer lengths (over 24 inches) are useful for applications below 300 Hz.
Outer Circumferance: Holds 4.25 inches of wire per turn.
Length of case: Outer case length is 1.25 inches longer than ferrite length.
Ferrite Technical Properties Charts
U.S.A. only. No Foreign Orders.
2000u
Part # | Ferrite Length | Ferrite Outside Diameter | Ferrite Weight | Test Frequency * | Test Inductance ** | Resistance per turn at 1000 Hz | Resistance per turn at 120 Hz | __Price |
| VFR4T | 4.5 in | 1.0 in |
6 oz | 540 KHz | 537 uH | 0.3732943: | 0.0115774: | $ 15.00 |
| VFR5T | 5.6 in | 1.0 in |
8 oz | 506 KHz | 627 uH | 0.53028 | 0.013633 | $ 18.75 |
| VFR6T | 6.7 in | 1.0 in |
10 oz | 467 KHz | 735 uH | 0.72704 | 0.016521 | $ 22.50 |
| VFR7T | 7.8 in | 1.0 in |
12 oz | 438 KHz | 831 uH | 0.92760 | 0.019478 | $ 26.25 |
| VFR9T | 9.0 in | 1.0 in |
14 oz | 421 KHz | 907 uH | 1.102676 | 0.022042 | $ 30.00 |
| VFR10T | 10.1 in | 1.0 in |
1lb 0 oz | 408 KHz | 962 uH | 1.233239 | 0.024014 | $ 33.75 |
| VFR11T | 11.2 in | 1.0 in |
1 lb 2 oz | 395 KHz | 1027 uH | 1.47183 | 0.026535 | $ 37.50 |
| VFR12T | 12.3 in | 1.0 in |
1 lb 4 oz | 384 KHz | 1088 uH | 1.687323 | 0.029183 | $ 41.25 |
| VFR13T | 13.5 in | 1.0 in |
1 lb 6 oz | 376 KHz | 1128 uH | 1.76338 | 0.030746 | $ 45.00 |
| VFR14T | 14.6 in | 1.0 in |
1 lb 8 oz | 370 KHz | 1170 uH | 1.901408 | 0.032633 | $ 48.75 |
| VFR15T | 15.7 in | 1.0 in |
1 lb 10 oz | 365 KHz | 1195 uH | 1.991549 | 0.033859 | $ 52.50 |
| VFR16T | 16.8 in | 1.0 in |
1 lb 12 oz | - KHz | - uH | - | - | $ 56.25 |
| VFR18T | 18.0 in | 1.0 in |
1 lb 14 oz | - KHz | - uH | - | - | $ 60.00 |
| VFR19T | 19.1 in | 1.0 in |
2 lb 0 oz | - KHz | - uH | - | - | $ 63.75 |
| VFR20T | 20.2 in | 1.0 in |
2 lbs 2 oz | - KHz | - uH | - | - | $ 67.50 |
| VFR21T | 21.3 in | 1.0 in |
2 lbs 4 oz | - KHz | - uH | - | - | $ 71.25 |
| VFR22T | 22.5 in | 1.0 in |
2 lbs 6 oz | - KHz | - uH | - | - | $ 75.00 |
| VFR23T | 23.6 in | 1.0 in |
2 lbs oz 8 | - KHz | - uH | - | - | $ 78.75. |
| VFR24T | 24.7 in | 1.0 in |
2 lbs 10 oz | 305 KHz | 1705 uH | 3.85211 | 0.06197 | $ 82.50 |
| VFR25T | 25.8 in | 1.0 in |
2 lbs 12 oz | - KHz | - uH | - | - | $ 86.25 |
| VFR27T | 27.0 in | 1.0 in |
2 lbs 14 oz | - KHz | - uH | - | - | $ 90.00 |
Green area on chart shows recommended operating frequency range.
ORDERING:
Prices subject to change without notice. All sales final. (So you know you're getting a brand new ferrite rod, not a used or pre-owned one, thank you!).
Shipping/Handling charges are extra, depends on weight and size of box at actual time of shipping.
* Test Frequency is for example: When a coil of wire is wound and centered on the rod: 71 turns of # 22 wire and a 151 pF capacitor is used for resonating the coil.
** Test inductance is measured when a coil of wire is wound and centered on the rod: 71 turns of # 22 wire.
***Ohms per turn is measured with 71 turns of # 22 wire wound on the center of the rod. Test frequency is 1000 Hz or 120 Hz as indicated.