Model SB-1 is a static bleeder meant for 50 or 75 ohm coax line. It is rated from 1-150 Mhz at 1.5KW with a maximum SWR of 5:1 on the line. The bleeder is used on a coax “T” in line with the coax transmission line as shown in the picture below. SB-1 Coax Static Bleeder installed on coax “T” connector To use procure a coax “T” and a male to male connector. Connect the SB-1 to the male to male connector and thence to the coax “T”. Static voltages are bled off from the center conductor to the outside conductor (braid of the coax). At the entrance to your radio station ensure that the outside conductor of the coax transmission line is grounded so as to provide a sink for the static electricity on the antenna center conductor. The SB-1 static bleeder is usually installed near the radio shack entrance on the antenna side of any 1:1 baluns/line isolators (between isolator and radio) if used. the connector is a male PL-259 and will fit into a SO-239 (female) or "T" with female counterpart to the PL-259. Small, convenient, effective and easy to install! "T" connector shown in picture NOT included.
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.