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20-6 Meter Loop Antenna System with 4:1 Balun and Choke Combo, (20, 17, 15, 12, 11, 10, 6 meters) 500/1.5KW/5KW PEP Options
20-6 Meter Loop Antenna System with 4:1 Balun and Choke Combo, (20, 17, 15, 12, 11, 10, 6 meters) 500/1.5KW/5KW PEP Options
SKU PAL-LOOP2006-XXX
List price
$189.95
Save 21%
$149.95
On Sale
40-6 Meter Loop Antenna System with 4:1 Balun and Choke Combo, (40, 20, 17, 15, 12, 11, 10, 6 meters) 500/1.5KW/5KW PEP Options
40-6 Meter Loop Antenna System with 4:1 Balun and Choke Combo, (40, 20, 17, 15, 12, 11, 10, 6 meters) 500/1.5KW/5KW PEP Options
SKU PAL-LOOP4010
List price
$189.95
Save 11%
$169.95
On Sale
50:100 (2:1) CUBE™ Balun/Unun 1.8-61 MHz, 2KW/5KW, Loop Antennas
50:100 (2:1) CUBE™ Balun/Unun 1.8-61 MHz, 2KW/5KW, Loop Antennas
SKU CB-2-2000
List price
$159.95
Save 25%
$119.95
On Sale
50:450 ohm (9:1) CUBE™ Unun, 1.8-61 MHz, 1.5 KW, End Fed Long Wire
50:450 ohm (9:1) CUBE™ Unun, 1.8-61 MHz, 1.5 KW, End Fed Long Wire
SKU CU-9-1500
List price
$129.95
Save 15%
$109.95
On Sale
Coax Common Mode Noise Filter - 500 Watts PEP, 1-60 MHz, -38dB Common Mode Noise Suppression!
Coax Common Mode Noise Filter - 500 Watts PEP, 1-60 MHz, -38dB Common Mode Noise Suppression!
SKU CMNF-500-50
List price
$79.95
Save 13%
$69.95
On Sale
CUBE Feed Line Choke/Line Isolator Unun, 1.5KW, 1.8-65 MHz, -38dB Suppression
CUBE Feed Line Choke/Line Isolator Unun, 1.5KW, 1.8-65 MHz, -38dB Suppression
SKU CU-1-1500SO
List price
$149.95
Save 27%
$109.95
DELUXE Desktop Computer with AC power RFI Kit - 11 Filters
DELUXE Desktop Computer with AC power RFI Kit - 11 Filters
SKU RFI-DESKTOP-DELUXE
$69.95
On Sale
Ferrite Mini Snap On Combo Pack, Mix 31, RFI Range 1-300 MHz - 10 filters (3/8, 1/2, 3/4)
Ferrite Mini Snap On Combo Pack, Mix 31, RFI Range 1-300 MHz - 10 filters (3/8, 1/2, 3/4)
SKU FMSCP-31-10
List price
$55.95
Save 11%
$49.95
On Sale
Ferrite Ring and Snap On Combo Pack - 10 Rings (1.4" ID) + 10 Snap On Beads (1/2" ID) - Mix 31 (RFI Range 1-300 MHz) FREE USA SHIPPING
Ferrite Ring and Snap On Combo Pack - 10 Rings (1.4" ID) + 10 Snap On Beads (1/2" ID) - Mix 31 (RFI Range 1-300 MHz) FREE USA SHIPPING
SKU FRSCP-31-20
List price
$155.00
Save 10%
$139.95
On Sale
Ferrite Ring Combo Pack, FT240 - 1.4" ID, 10 Rings - Mix 31(4), 61(3), 75(3), RFI Range .15-2000 MHz
Ferrite Ring Combo Pack, FT240 - 1.4" ID, 10 Rings - Mix 31(4), 61(3), 75(3), RFI Range .15-2000 MHz
SKU FRCP-240-10
List price
$139.50
Save 14%
$119.95
On Sale
Ferrite Snap On Combo Pack, Mix 31, RFI Range 1-300 MHz - 1/4, 3/8, 1/2, 3/4 - 22 filters
Ferrite Snap On Combo Pack, Mix 31, RFI Range 1-300 MHz - 1/4, 3/8, 1/2, 3/4 - 22 filters
SKU FSCP-31-22
List price
$108.00
Save 12%
$95.00
On Sale
Ferrite Snap on/Ring Combo Pack, Mix 31, RFI Range 1-300 MHz - 16 filters
Ferrite Snap on/Ring Combo Pack, Mix 31, RFI Range 1-300 MHz - 16 filters
SKU FSRCP-31-16
List price
$112.00
Save 15%
$95.00
On Sale
FT240-3I, ID=1.4", AC/DC/Coax Noise Filter, RFI Range 1-300 MHz, Bulk Pack of 10
FT240-3I, ID=1.4", AC/DC/Coax Noise Filter, RFI Range 1-300 MHz, Bulk Pack of 10
SKU F240-31-10
List price
$100.00
Save 10%
$89.95
On Sale
FT240-3I, ID=1.4", AC/DC/Coax Noise Filter, RFI Range 1-300 MHz, Mini Pack of 3
FT240-3I, ID=1.4", AC/DC/Coax Noise Filter, RFI Range 1-300 MHz, Mini Pack of 3
SKU F240-31-3
List price
$34.95
Save 14%
$29.95
On Sale
Garage Door Opener RFI Kit
Garage Door Opener RFI Kit
SKU RFI-GDO
List price
$49.95
Save 20%
$39.95
On Sale
Home Theater System RFI Kit for up to 4 HDTV, A/V units + I/O cables - 12 filters
Home Theater System RFI Kit for up to 4 HDTV, A/V units + I/O cables - 12 filters
SKU RFI-HTS
List price
$89.95
Save 22%
$69.95
On Sale
Hybrid 4:1 Balun + 1:1 Current Balun in one enclosure, 1.8-61 MHz, 1.5/5KW PEP - Loop, OCF Antennas
Hybrid 4:1 Balun + 1:1 Current Balun in one enclosure, 1.8-61 MHz, 1.5/5KW PEP - Loop, OCF Antennas
SKU CB-4-1-1500
List price
$189.95
Save 26%
$139.95
On Sale
Hybrid 6:1 Current Balun + 1:1 Current Balun in one enclosure, 1.8-61 MHz, 1.5KW/5KW PEP
Hybrid 6:1 Current Balun + 1:1 Current Balun in one enclosure, 1.8-61 MHz, 1.5KW/5KW PEP
SKU CB-6-1-1500
List price
$189.95
Save 21%
$149.95
On Sale
Kurt Speaks Out - Digital PDF Version - Download Now!
Kurt Speaks Out - Digital PDF Version - Download Now!
SKU KURT-KSO-PDF
List price
$14.95
Save 100%
$0.00
On Sale
Laptop Computer with DC power RFI Kit - 7 Filters
Laptop Computer with DC power RFI Kit - 7 Filters
SKU RFI-Laptop
List price
$34.95
Save 14%
$29.95
MINI-BALUN 1:1 Coax Interface to Ladder Line, Dipole elements, 500 Watts PEP, up to -38Db Common Mode Rejection, 1-61 MHz, Flagpole, Dipole, Beam and G5RV/ZS6BKW Antennas
MINI-BALUN 1:1 Coax Interface to Ladder Line, Dipole elements, 500 Watts PEP, up to -38Db Common Mode Rejection, 1-61 MHz, Flagpole, Dipole, Beam and G5RV/ZS6BKW Antennas
SKU MB-1-500SS
$69.95
On Sale
Multi Ratio 4:1/6:1/9:1 CUBE™ Balun, 1.8-61 MHz, 1.5 KW
Multi Ratio 4:1/6:1/9:1 CUBE™ Balun, 1.8-61 MHz, 1.5 KW
SKU CB-4-9-1500
List price
$149.95
Save 13%
$129.95
Super-Choker™ Common Mode Feed Line Chokes
Best Sellers
Best Sellers from all categories
Sometimes you need a high power common mode choke that is super effective and the Super-Choker™ products fill this need very well. All Super-Choker™ chokes use multiple turns through ferrite cores for higher choking impedance compared to our multi-bead sleeve chokes which only use one turn through multiple cores. Different ferrite mixes and turns ratios are used to optimize choking impedance in the selected product frequency range.
Super-Choker™ chokes are manufactured with 1/2″ 52 ohm coax cable (rated for full amateur radio legal limit of 1500 watts continuous (or the capacity of the coax cable at the selected frequency – good for over 5KW on 4 MHz into a matched load for example) with PL-259 connectors that can be connected to your coax feed line with simple double female barrel connectors.
Super-Choker™ chokes are ideal for high power stations and are very effective for keeping common mode current off the feed line on verticals, dipoles, and loop antennas at their feed point and also for choking coax lines at the station input to reduce common mode noise picked up by the outside of the coax braid between the feed point and the station entrance.
Ferrite core kits are available separately if you want to supply your own coax feed line.
Super Choker™ Case History:
I run an 80 meter loop antenna about 30 feet in height and have previously been using a coaxial balun common mode choke of 25 turns of RG-213 on a 6 inch form attached about 6 feet under the corner feed point of the loop (configured in a triangle). Using a Dentron 3000 antenna tuner I was able to tune all the ham bands and the lowest SWR was about 1.4 on most bands. The antenna feed line was led away from the corner of the loop and was not under the loop. Feed line length was about 105 feet as measured on the Aim 4170-TDR function.
I first placed a Super Choker™ 8010 at the antenna tuner leaving the coaxial balun in place. As I retuned the antenna tuner, the first thing I noticed was that I could now tune down to 1.1:1 on 80, 40 and 20 meters and I could not do that before. The noise level which had been running about S7 on 40 meters during the day had dropped to about S6 on my TS-870 receiver. I was pleased that the reflected power was now almost nil and the noise level was lower.
I then took the next step and replaced the coaxial balun and Super Choker 8010 with a Super Choker™ 16040 in series with a Super Choker 4010 for maximum choking power from 80-10meters. The antenna tuning was about the same but now the SWR was 1.0:1 on 80-10 meters and the noise level on 40 was down to S5. I tuned up on 20, 15 and 10 meters and worked a couple of JA’s and noticed that the noise level on 10 and 15 was not even S1 – something I had not experienced before on the 5 acre plot of land we call home.
What a welcome relief to find such a simple solution to RF feedback I had experienced and I got a lower noise level to boot!
Now to plan that 160 meter loop! I wonder what Krusty ole Kurt would use?
Bob, AK6R