BALUNS, UNUNS & Line Isolators

Our BALUNs use multiple composite cores selected to provide the widest bandwidth of any BALUN on today's market. Out UNUNs are composed of similar, but not the same ferrite selections. In either case, our multi-core antenna matching transformers (BALUNS) provide the best match across the HF and VHF spectrum. Where impedance variations occur with an increase in operating frequency, our manifold ferrites exhibit a change that compliment this match.
In addition to matching the feed-line cable to the antenna for maximum transfer of RF energy, the BUXCOMM MasterMatch BALUNS
improve the radiation pattern formore predictable coverage. See with and without patterns above.

Antenna BALUNS, UNUNS, and Line Isolators

When you connect center fed antennas, like dipoles, Inverted Vee s, Loops, Yagis, Rhombics, etc, to coaxial cable, care must be taken to insure that you don't end up with feed line radiation. Not only can the loss in power be quite significant, but the radiation characteristics of the antenna system will also be seriously compromised. In lay terms, it won't be what you are expecting from the pattern of your antenna.

The feed-line, coax or twin lead is to be considered  part of the antenna. RF currents can flow from the feed-line shield or wire feed-line into the utility power mains and into nearby t elevision and other communications cables. Support masts andmetal poles can cause a variety of TVI and EMI problems that can be very difficult to trace. Frequently these problems are due to the lack of antenna line-isolation or no BALUN to prevent this condition. The solution is to use a BALUN at the feed-point of your antenna, or a Line-Isolator (B2KLISO) at the output of your transceiver or linear. In other words, at the input to your coax feed-line to the antenna.

More, important information for the HAM;

High impedance BALUNs exhibit a poor bandwidth because of increased reactance caused by parasitic's within its core.With BALUNs having ratios of 12:1, and 16:1 we begin to see some self resonant activity due to the added inductance(s) that are employed in these BALUNs.

As we move higher in frequency this added inductance begins to "ring" or display parasitic's which causes the BALUN efficiency (and band-width) to degrade rapidly, in effect, causing the maximum usable frequency to suffer.When this happens several troubles arise;Core saturation (regardless of the core size), VSWR begins to rise, VSWR creates heat (RF power loss/dissipation) within the transmission line, and self-resonance at the higher HF frequencies above 14 MHz. All can cause unnecessary losses.

So when you consider using an antenna with 600 (12:1), or 800 (16:1), ohms(Z impedance) at the feed-point, think again about the consequences that lurk as you move up in frequency.

For most antennas with feed-points that exhibit impedances near 200 ohms, Windom's, Sky-wire/Loops, etc, use the 4 to 1 BALUN.When the 4:1 BALUN (50 to 200 ohms) is constructed in the correct manner, it has a band-width that is wider than any other BALUN made.Our BUXCOMM 4:1 BALUNs exhibit an operating range that reaches above the VHF region.

The Rule of Thumb:

1 to 1 BALUNs are used mostly with center-fed dipoles.
2 to 1 BALUNs are employed with high-frequency Quads and loop antennas (above 40 meters).
4 to 1 BALUNs are commonly used with Windom's, Off-Center fed, and Sky-wire loops cut for 75/80 and 160 meters.
6 to 1 BALUNs are sometimes used with antennas that are fed with 300 ohm feed line.
9 to 1 BALUNs are the BALUN of choice when feeding end-fed, long-wire antennas.
The 9:1 is also preferred when feeding a T2FD antenna that has a 450 ohm balanced terminating load at its center.

Here's the got'cha;When feeding mobile antennas that are end-fed, use coax cable, HOWEVER, the feed-point impedance of most (bottom) end-fed mobile antennas is somewhere between 15 and 35 ohms.To remedy this requirement, we have developed the B1K5022 UNUN.

Where a VHF or UHF yagi is in use, improved transfer of energy is realized when using the B1VBALUN.  For practical purposes, the 12 to 1 and 16 to 1 BALUNs should be avoided where possible. In rare cases. the 12 to 1 BALUN will be necessary when feeding an antenna with 600 ohm open-wire, transmission line. A 16 to 1 BALUN is often used with Rhombic antennas that employ 800 ohm termination balancing network resistors.

BUXCOMM is BALUN Headquarters.
BUXCOMM BALUNS are in the Commonwealth of Virginia

We highly recommend using CoaxSeal, CS104 on all BALUN and UnUn
terminals and attachments.
Any BALUN installed out-of-doors is subject to harsh
weather, hard driving rain, and heavy winds. These conditions can allow
moisture to develop inside a BALUN when the connections are not sealed.





497
B15C91 The ideal BALUN for use with Folded dipoles, antennas fed with 450 ladder-line, and long-wire antennas.
1

B15C91
The ideal BALUN for use with Folded dipoles, antennas fed with 450 ladder-line, and long-wire antennas.


$34.95

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23
B15K11 High Performance, Heavy Duty BALUN, with built-in, center insulator. The B15K11 is PoweRated @ 1500 wts SSB.
1

B15K11
High Performance, Heavy Duty BALUN, with built-in, center insulator. The B15K11 is PoweRated @ 1500 wts SSB.


$34.95

Add:

496
B15K41 4 to 1 Current BALUN, PoweRated @ 1500 watts SSB. Frequency Response 1.5 to 55 MHz.
1

B15K41
4 to 1 Current BALUN, PoweRated @ 1500 watts SSB. Frequency Response 1.5 to 55 MHz.


$34.95

Add:

499
B15K61 6 to 1 Current BALUN, PoweRated @ 1500 watts SSB. Frequency Response 1.0 to 55 MHz.
1

B15K61
6 to 1 Current BALUN, PoweRated @ 1500 watts SSB. Frequency Response 1.0 to 55 MHz.


$29.95

Add:

294
B1K161 Use with T2FD with 800 ohm termination, or antennas fed with 800 ohm ladder line.
1

B1K161
Use with T2FD with 800 ohm termination, or antennas fed with 800 ohm ladder line.


$34.95

Add:

26
B1K21 2:1 Multi-Core, ferrite mix,50 ohms unbalanced to 100 ohms balanced, 1500 watts SSB 1.7 to 30 MHz
1

B1K21
2:1 Multi-Core, ferrite mix,50 ohms unbalanced to 100 ohms balanced, 1500 watts SSB 1.7 to 30 MHz


$34.95

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498
B1K5022 Mobile BALUN designed to put the RF power into your mobile antenna. BUXCOMM Master Match Mobile BALUN.
1

B1K5022
Mobile BALUN designed to put the RF power into your mobile antenna. BUXCOMM Master Match Mobile BALUN.


$39.95

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38
B1KC121 12:1 BALUN with multiple cores, This BALUN is most used with T2FD antennas with 600 ohm termination resistor.
1

B1KC121
12:1 BALUN with multiple cores, This BALUN is most used with T2FD antennas with 600 ohm termination resistor.


$34.95

Add:

99
B1U41 50 ohm SO239 unbalanced input. (SO239) unbalanced 4:1 (200 ohm) output.
1

B1U41
50 ohm SO239 unbalanced input. (SO239) unbalanced 4:1 (200 ohm) output.


$39.95

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41
B1VBALUN DeCoupling transformer. Although specd for upper VHF region many are being used into UHF
1.2

B1VBALUN
DeCoupling transformer. Although specd for upper VHF region many are being used into UHF


$39.95

Add:

30
B2K11 50 ohm to 50 ohm, 1:1 current type BALUN is ideal when feeding dipoles etc..
1

B2K11
50 ohm to 50 ohm, 1:1 current type BALUN is ideal when feeding dipoles etc..


$39.95

Add:

9
B2K115TH The B2K115TH is poweRated @ 2000 watts, and most often used with HF; 3, 5, and 7 element beams.
1

B2K115TH
The B2K115TH is poweRated @ 2000 watts, and most often used with HF; 3, 5, and 7 element beams.


$39.95

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43
B2K41 4 to 1 Current BALUN, with built-in Center Insulator. PoweRated @ 2000 watts SSB. Frequency Response 1.0 to 55 MHz.
1

B2K41
4 to 1 Current BALUN, with built-in Center Insulator. PoweRated @ 2000 watts SSB. Frequency Response 1.0 to 55 MHz.


$39.95

Add:

21
B2KLISO Coaxial in-Line isolator, 160 TO 2 Meters (1.5 to 175 MHz) LINE ISOLATOR, easily handles 3000 watts.
1

B2KLISO
Coaxial in-Line isolator, 160 TO 2 Meters (1.5 to 175 MHz) LINE ISOLATOR, easily handles 3000 watts.


$39.95

Add:

27
B2U11 52 ohm SO239 unbalanced input and unbalanced output. 1.5 to 55 MHz. 2 kW SSB
1

B2U11
52 ohm SO239 unbalanced input and unbalanced output. 1.5 to 55 MHz. 2 kW SSB


$39.95

Add:

1
B4KC41 5000 Watts PEP BALUN, With multiple ferrite Cores and built-in center insulator. 5kW SSB
2

B4KC41
5000 Watts PEP BALUN, With multiple ferrite Cores and built-in center insulator. 5kW SSB


$69.95

Add:

21
B5KC11 1:1 Current BALUN, PowerRated @ 4000 Watts SSB . 2000 watts AM/FSK, AM,PSK
1.5

B5KC11
1:1 Current BALUN, PowerRated @ 4000 Watts SSB. 2000 watts AM/FSK, AM,PSK


$69.95

Add:

498
BLW91 1:9, Asymmetrical to asymmetrical (unbalanced to unbalanced, 1.5 kw ssb) with antenna output studs.
1

BLW91
1:9, Asymmetrical to asymmetrical (unbalanced to unbalanced, 1.5 kw ssb) with antenna output studs.


$39.95

Add:

10
BTR-1KW BUXCOMM model BTR-1KW (Non-Inductive) 1000 Watts SSB 450 ohm, BTR. MADE IN THE USA
0

BTR-1KW
BUXCOMM model BTR-1KW (Non-Inductive) 1000 Watts SSB 450 ohm, BTR. MADE IN THE USA


$89.95

Add:

15
BTRB1400 Iintegrated 9:1 BALUN with a 1400 watt SSB, 450 ohm (Non-Inductive) Broadband Terminating Resistor.
1.8

BTRB1400
Iintegrated 9:1 BALUN with a 1400 watt SSB, 450 ohm (Non-Inductive) Broadband Terminating Resistor.


$199.95

Add:

146
CS104 For all type of outdoor antenna connections BALUNS Coax connectors coax bulkhead entry panels and mobile installations
0.2

CS104
For all type of outdoor antenna connections BALUNS Coax connectors coax bulkhead entry panels and mobile installations


$3.25

Add:

334
FB12543 1 & 1/4 inches OD, Type 43 material, the recommended HF BALUN Core Material.
0.2

FB12543
1 & 1/4 inches OD, Type 43 material, the recommended HF BALUN Core Material.


$2.95

Add:

197
FB240-61 Large 2.4 inch, 61 ferrite mix. Type K,. Recommended use in HighPower HF BALUNs.
0.2

FB240-61
Large 2.4 inch, 61 ferrite mix. Type K,. Recommended use in HighPower HF BALUNs.


$6.95

Add:

188
FB30061 No. 61 Composition Core balun bobbin
0.2

FB30061
No. 61 Composition Core balun bobbin


$1.95

Add:

903
FB3061ROD 61 material mix = 125u,
0.2

FB3061ROD
61 material mix = 125u,


$1.95

Add:

185
FB31061 Our number one selling toroid core for BALUN construction.
0.3

FB31061
Our number one selling toroid core for BALUN construction.


$3.95

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351
FB438U Use this core to make choke BALUN or Line Isolator, The perfect fit for RG8U RG213 RG214 9913
0.2

FB438U
Use this core to make choke BALUN or Line Isolator,
The perfect fit for RG8U RG213 RG214 9913


$1.95

Add:

1165
FB438X Ten (10) of these on RG8X (mini 8) equate to a 40 core (choke) BALUN.
1

FB438X
Ten (10) of these on RG8X (mini 8) equate to a 40 core (choke) BALUN.


$1.95

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189
FBSOCHOKE NOISE SUPPRESSOR Snap-to-gether Ferrite Choke. Reduces or prevents noise ingress. Fits cable dia 1/4" to 1/2"
0.2

FBSOCHOKE
NOISE SUPPRESSOR Snap-to-gether Ferrite Choke. Reduces or prevents noise ingress. Fits cable dia 1/4" to 1/2"


$5.95

Add:

120
FBSOCHOKEX10 Ten, NOISESUPPRESSOR Snap-to-gether Ferrite Choke... and RFI is history. Fits cable size 1/4" to 1/2"
1

FBSOCHOKEX10
Ten, NOISESUPPRESSOR Snap-to-gether Ferrite Choke... and RFI is history. Fits cable size 1/4" to 1/2"


$49.60

Add:

95
INSULACI Antenna Center Insulator with heavy-duty, end mount, and suspension eyebolt, and cylon clasp for BALUN support.
0.4

INSULACI
Antenna Center Insulator with heavy-duty, end mount, and suspension eyebolt, and cylon clasp for BALUN support.


$9.95

Add:

16
RFC1SO Pak of 2, Snap on RF Choke to Eliminate Common RF (interference).
0.3

RFC1SO
Pak of 2, Snap on RF Choke to Eliminate Common RF (interference).


$9.95

Add:

830
WINGNUT832 When nuts need tightened or loosened frequently without the use of tools, wing nuts are the solution. Pak of 5
0.1

WINGNUT832
When nuts need tightened or loosened frequently without the use of tools, wing nuts are the solution. Pak of 5


$0.95

Add:

519
8XPLPL Made of top-quality, RG8X coax cable with PL259 connectors installed Select length from drop-down menu
0

8XPLPL
Made of top-quality, RG8X coax cable with PL259 connectors installed
Select length from drop-down menu


$6.95

... more info

32
GROUNDROD Heavy Gauge Copper-Clad Steel Core with tapered tip 1/2 diameter, with Copper ground wire clamp.
3

GROUNDROD
Heavy Gauge Copper-Clad Steel Core with tapered tip 1/2 diameter, with Copper ground wire clamp.


$17.95

Add:

516
CLASP38UV Pak of 8 Coax Cable Clasps, use to support or hang RG8U, RG213, & 9913 etc
0.1

CLASP38UV
Pak of 8 Coax Cable Clasps, use to support or hang RG8U, RG213, & 9913 etc


$0.95

Add:



New Products For October - BALUNS, UNUNS & Line Isolators


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