BULLET Impedance Transformers (1:1, > 1:1) - Iron Powder Cores

BULLET Impedance Transformers (1:1, > 1:1)
Store/Antenna Products/BULLET Impedance Transformers (1:1, > 1:1)
BULLET format transformers are made in ratios from 1:1 up to 16:1 in 100/500/1500/5000 watt PEP Models. We also make BULLET Hybrids of NN:! + 1:1 in the same enclosure.
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Bullet 50:100 (2:1) HF Balun, .1-61 MHz, 500/1500 Watts PEP, Loop Antenna
Bullet 50:100 (2:1) HF Balun, .1-61 MHz, 500/1500 Watts PEP, Loop Antenna
SKU Bullet-2B-500EB
$89.95
Bullet 50:200 (4:1) HF Balun, 1.8-61 MHz, 500/1500 Watts PEP, Loop, OCF, ZEPP
Bullet 50:200 (4:1) HF Balun, 1.8-61 MHz, 500/1500 Watts PEP, Loop, OCF, ZEPP
SKU Bullet-4B-500EB
$89.95
Bullet 50:200 (4:1) HF Unun, 1.8-61 MHz, 100/500/1500 Watts, End Fed OCF Antennas
Bullet 50:200 (4:1) HF Unun, 1.8-61 MHz, 100/500/1500 Watts, End Fed OCF Antennas
SKU Bullet-4U-100
$69.95
Bullet 50:300 (6:1) HF Balun, 1.8-61 MHz, 500/1500 Watts PEP, OCF, ZEPP, Folded Dipole
Bullet 50:300 (6:1) HF Balun, 1.8-61 MHz, 500/1500 Watts PEP, OCF, ZEPP, Folded Dipole
SKU Bullet-6B-500EB
$89.95
Bullet 50:450 (9:1) HF Balun, 1.8-61 MHz, 500/1500 Watts, T2FD, BBTD, ALE
Bullet 50:450 (9:1) HF Balun, 1.8-61 MHz, 500/1500 Watts, T2FD, BBTD, ALE
SKU Bullet-9B-500EB
$89.95
Bullet 50:50 (1:1) HF Balun + Optional Dipole Kit - .1-61 MHz, 500 Watts PEP, up to 34 dB noise reduction!
Bullet 50:50 (1:1) HF Balun + Optional Dipole Kit - .1-61 MHz, 500 Watts PEP, up to 34 dB noise reduction!
SKU Bullet-1B-500EB
$79.95
Bullet 50:600 (12:1) HF Balun, 1.8-61 MHz, 500/1500 Watts, T2FD, BBTD, ALE
Bullet 50:600 (12:1) HF Balun, 1.8-61 MHz, 500/1500 Watts, T2FD, BBTD, ALE
SKU Bullet-12B-500
$89.95
Bullet 50:800 (16:1) HF Balun, 3-30 MHz, 500/1500 Watts, T2FD, BBTD, ALE
Bullet 50:800 (16:1) HF Balun, 3-30 MHz, 500/1500 Watts, T2FD, BBTD, ALE
SKU Bullet-16B-500EB
$89.95
Bullet Hybrid (16:1) HF Balun + 1:1 Choke, 1.8-31 MHz, 500 Watts, T2FD, BBTD, ALE
Bullet Hybrid (16:1) HF Balun + 1:1 Choke, 1.8-31 MHz, 500 Watts, T2FD, BBTD, ALE
SKU Bullet-16-1-500EB
$119.95
Bullet Hybrid (2:1) HF Balun + 1:1 Choke, 1.8-61 MHz, 500/1500 Watts, OCF, Loop, Folded Dipole Antennas
Bullet Hybrid (2:1) HF Balun + 1:1 Choke, 1.8-61 MHz, 500/1500 Watts, OCF, Loop, Folded Dipole Antennas
SKU BULLET-2-1-500EB
$119.95
Bullet Hybrid (4:1) HF Balun + 1:1 Choke, 1.8-61 MHz, 500/1500 Watts, OCF, Loop, Folded Dipole Antennas
Bullet Hybrid (4:1) HF Balun + 1:1 Choke, 1.8-61 MHz, 500/1500 Watts, OCF, Loop, Folded Dipole Antennas
SKU BULLET-4-1-500EB
$119.95
Bullet Hybrid (9:1) HF Balun + 1:1 Choke, 1.8-61 MHz, 500 Watts, T2FD, BBTD, ALE
Bullet Hybrid (9:1) HF Balun + 1:1 Choke, 1.8-61 MHz, 500 Watts, T2FD, BBTD, ALE
SKU BULLET-9-1-500EB
$119.95
Super Bullet 50:50 (1:1) HF Balun + Optional Dipole Kit - .1-61 MHz, 1500 Watts PEP, up to 38 dB noise reduction
Super Bullet 50:50 (1:1) HF Balun + Optional Dipole Kit - .1-61 MHz, 1500 Watts PEP, up to 38 dB noise reduction
SKU SBULLET-1B-1500EB
$119.95
Super Bullet 50:50 (1:1) HF Balun + Optional Dipole Kit - .1-61 MHz, 5000 Watts PEP, up to 60 dB noise reduction
Super Bullet 50:50 (1:1) HF Balun + Optional Dipole Kit - .1-61 MHz, 5000 Watts PEP, up to 60 dB noise reduction
SKU SBULLET-1B-5000EB
$129.95
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IRON POWDER TOROID CORES-xx

Iron powder cores are more stable than ferrites and do not saturate as easily so they are best for tuned circuits, filters, and high power inductors. They come in different “Mixes” for use at different frequencies. For best “Q” use the Mix specified for your frequency.To find the number of turns to give the desired inductance for your coil use the formula below:

Turns = 100 x

Toroid Dimensions

To order specify core size and mix (e.g. T200A-2). Available in sizes that have µH per 100 turns shown in table.

All iron powder cores are special orders. Please allow one week for shipment after order received.

The iron powder cores shown in the above tables are primarily used for either high power feed line chokes for common mode current reduction or for 4:1 and 9;1 very high power transmission line transformers.

For high power feed line chokes, choose the inside diameter of the iron powder core closest to the transmission line outside diameter and use 6-20 cores at the junction with the antenna feed.

For 4:1 (50/200 or 75/300 ohm) transmission line transformers in the range of 1.8-30 Mhz, select the size appropriate for the power level as follows:

T200A x 2 = 1.5KW

T300A x 2 = 2.5KW

T400A x 2 = 5KW

Use Mix 2 for all the above transmission line transformers. Fully assembled and enclosed units are available for each of the power levels. Click HERE for information.

4:1 transmission line transformers using iron powder cores are typically used for ladder line to 50 ohm coax connections

For .1 – 2 Mhz wide band transformers use Mix 26 which has a higher permeability and requires less turns to achieve a given inductance. Mix 2 has almost constant permeability from 1-30 Mhz. Mix 26 has an initial permeability of 75 at .1 Mhz and gradually decreases to about 10 at 30 Mhz. For high power AM broadcast range (.5-1.7 Mhz) transformer, use Mix 26 to reduce the turn count.

Minimum order for iron powder cores is $50

Shipping on larger cores in quantity may be more than $10 – email/call for quote.