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FIGURE 1a
Figure 1b
USE BUX "VHF" UNUN (ONION) withJ-Pole 1:1, 1 kw VHF Balun, BUX BALUN 11V $19.95
Hi-Q, toroid design, wound with teflon covered, silver wire. For VHF beams and J-Pole matching applications, and construction.
BUX BALUNs should be installed at the antenna feed point, or where the coax or feed-line attaches to the above ground antenna. BUX BALUNs are used to connect balanced antennas to unbalanced transmission lines, such as coax cable. Their primary purpose is to prevent antenna (RF) currents from flowing down the outside of the cable. Another function of the BUX BALUN41 is to match the impedance of an unbalanced coax to the balanced feed point of a balanced input antenna(s). BUX BALUNS may also be used as “line isolators” anywhere along the cable to prevent the destructive influence of induced RF currents (VSWR).
BUX 1:1 BALUNs are current BALUNs. They consist of several large, number 73, ferrite type 44 cores. BUX BALUN11 operate from 3.5 to 72 MHz and allow use of RF power to the rated capacity of the BALUN.
Most of our BUX 4:1 BALUNs are voltage BALUNs. They consist of a large, number 41, ferrite dough-nut bobbin. BUX BALUN41 operate from 3.5 to 55 MHz and allow use of RF power to the rated capacity of the BALUN.
At BUX COMM, *We don't cut corners!
The components used in the manufacture of our BALUNs are from top quality components, beginning with the Silver Plate SO239 connectors and center insulator is made of teflon™(E.I Dupont). The wire we use to wind the ferrite donut is heavy-duty, silver flashed wire, with teflon™ insulation that will handle RF voltages above 5000 volts, and temperatures above 2000 degrees. The binding posts are heavy-duty, tempered brass, with end holes and side-thru holes to accommodate either type loop-thru connection. A double-shoulder brass capture nut is used to add a secure bite and improve antenna wire electrical connections. With our BUX UN UN (ONION), the coax is Belden™ and the PL259 connectors are Amphenol™.
4:1 Balun, BUXBALUN 41 $19.95
o 50 ohm, SO-239 unbalanced input
o Balanced output
o 1.8 to 50 MHz
o Toroid (Voltage) design
o Heavy Duty, Lightweight construction
o Sealed against moisture
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1:1 Balun, BUXBALUN 11 $19.95
o 50 ohm, SO-239 unbalanced input
o Balanced output
o 1.8 to 50 MHz
o Toroid (Current) design
o Heavy Duty, Lightweight construction
o Sealed against moisture
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BUX UN UN De-Coupling transformer, similar to above, but has SO-239 (female)
input connector and output connector is 1 ft Mini 8 cable with PL-259 (male).
BUX ONION $19.95
4:1, 1.5kw Balun, BUX BALUN 41HD $19.95
Toroid design, wound with teflon covered, silver plated wire.* Heavy-Duty, construction.1:1, 1.5kw Balun, BUX BALUN 11HD $19.95
Toroid design, wound with teflon covered, silver plated wire.* Heavy-Duty, construction.1:1, 1 kw VHF Balun, BUX BALUN 11V $19.95
Hi-Q, toroid design, wound with teflon covered, silver wire. For VHF beams and J-Pole matching applications, and construction.
BUX ONION Decoupling Transformer
BUX UN UN De-Coupling transformer, has SO-239 (female)input connector and output connector is 1 ft Mini 8 cable with PL-259 (male). BUX ONION is and UNbalanced to UNbalance (UN-UN) decoupling transformer designed to be used specifically with the DBLSPCL antenna. High RF currents traveling along the coax feed-line shield can cause high VSWR. This decoupling transformer prevents RF currents from traveling down the outer shield of the coax. The input connector is an SO239 (female) and the output connector is a PL259 (male), which mates the connector of the "DBLSPCL" RV/Apartment dweller antenna shown above.BUX ONION $19.95
WHY USE A 4:1 BALUN
Krusty Olde Kurt is now going to repeat himself. Why? Because the same question keeps coming up over and over. And he wants everyone to get it right.
"I'm feeding my dipole with 600-ohm line. At the station end I need a balun to convert to 50-ohm coax. I need a 12:1 balun, right?" Wrong! A 4:1 balun would be better.
Why is that? If your dipole is up, let's say, 35 feet then on 80 meters it will probably have a resistance at resonance of about 40 ohms. The actual resistance depends on the height above ground in wavelengths.
If the dipole is 40 Ohms then what do you see at the transmitter end of your 600 ohm line? If the line is a half-wave long (120 ft on 80 Meters) you'll see 40 ohms. Remember, a half-wave line repeats what it sees at the other end. But if it is a quarter-wave long you'll see 8500 Ohms! At other line lengths you'll see impedances somewhere between these two extremes.
So you are not going to see 600 ohms at the end of your 600-ohm line. That only happens if you have a 600-ohm antenna hooked onto it. With such a variation in impedance at the transmitter end of the line there is no one balun transformer that will match it. Most of the time the impedance will be above the 50 Ohms of your coax so a high impedance balun would be desirable. Unfortunately high impedance baluns don't work well when not matched.
Experience has shown that 4:1 baluns work best in this service. They are more rugged and will take bad mismatches especially if they are wound on an iron powder core. So stop searching for that 12:1 balun. Use a 4:l BALUN and your system will work just fine.
You can read Kurt N. Sterba “AERIALS” column in World Radio Magazine.
BUX MOBALUN
When you hear those strong HF mobile signals, here's one reason they stand out from the rest.
By installing the BUX MoBalun near the input to your antenna, you deliver more RF energy to the antenna. At the same time, the BUX MoBalun prevents RF from traveling back along the shield (high SWR) of your coax. High power rating, Low-permeability toroid, with Internal composition fiber-glass to prevent vibration during mobile operation. For input and output connectors, we use only the best Silver plated, Teflon insulated, SO239 connectors. 700 watts PEP. Our MoBALUN is also ideal for marine antenna installations.
$19.95 MOBALUN
ANTENNA INSULATORS
Weatherproof, (TENYTE) insulators. Perfect for your DIPOLE or Windom antenna.
For the apartment dweller, you can now hang the 20 meter doublet
in the attic. I've QSO'd with stations all over the world with the
33 ft dipole in my garage attic. One insulator at the center, and one each end.
It's great for other HF WINDOM and single-band dipole antennas. Dielectric strength is comparable to the old ceramic insulators, without susceptibility to cracking or breakage under impact or extreme temperature changes.
Package of 3, $2.99 ANTINSL3
Package of 10, Insulators $8.99, ANTINSLX10
UHF DOUBLE FEMALE BULKHEAD (feed-thru) CONNECTORS
For bulkhead and through-the-wall UHF connector feed-thru connections, with keeper nuts.:Order 7518-2 (Two inches) $ 2.95 ea.
Order 7518-4 (Four inches) $ 3.95 ea.
Order 7518-6 (Six inches) $ 4.95 ea.
Order 7518-8 (Eight inches) $ 8.95 ea.
Order 7518-10 (Ten inches) $ 10.95ea.
Order 7518-12 (Twelve inches) $12.95ea.
Heavy Duty (1") Nuts for the above bulkhead connectors.
2/.99 cents HDM1-NUT
50 Ohm impedance, 3 ft, 6 ft, 9 ft, 12 ft, & 18 feet.
These jumpers are made from high quality, low-loss, coax cable with PL-259 connectors installed at each end.
Three ft. (3') ORDER No. 8X3-PLPL $3.95
Six ft. (6') ORDER No. 8X6-PLPL $4.95
Nine ft. (9') ORDER No. 8X9-PLPL $5.95
Twelve ft. (12') ORDER No. 8X12-PLPL $7.95
Eighteen ft. (18')ORDER No. 8X18-PLPL $8.95
Reinforced, Double Bracket used with our "DBLSPCL" antennas shown elsewhere on this page.
Mount two mobile whips in a horizontal plane to form a compact apartment dweller Dipole, or RV antenna. Comes with two sets of mounting hardware (bolts), those shown here and another
set of longer bolts for larger masts. Double Antenna Bracket as shown at left.
$16.95 DBLBRKT
washer_s_small.jpgAfter a few years, the hardened, nylon shoulder washers become weather-brittle and break. Keep a few spares in the Ham Shack:
4 for 99˘ SM1SW
Mobile tuneable-tip antennas.BHF75M 75 METER 3/8" X 24 THREAD 8 feet long $16.95
BHF40M 40 METER 3/8" X 24 THREAD 8 feet long $16.95
BHF20M 20 METER 3/8" X 24 THREAD 8 feet long $16.95
BHF17M 17 METER 3/8" X 24 THREAD 8 feet long $16.95
BHF15M 15 METER 3/8" X 24 THREAD 8 feet long $16.95
BHF10M 10 METER 3/8" X 24 THREAD 8 feet long $16.95
BHF6M 6 METER 3/8" X 24 THREAD 5 feet long $16.95
Spare 48" Tips for above tuneable-tip antennas. TIP48, $2.95
Here's the perfect solution for your RV and portable HF antenna applications. Use our dipole, mast-mounted bracket for 'fixed-station', field-day operating, apartment dwellers, and the RV travelers. With two of the mobile HF antennas shown at left, you can have the best of both worlds.
By combining a pair (two) of the single band HF Mobile (loaded) tuneable-tip antennas, and (VHF) whips at left, you can have an ideal, single element, horizontal dipole (beam). This type antenna opens the world of HF and VHF communications for the apartment dweller, RV HAM, field-day operating, and a variety of other uses and applications. Shown mounted on 1 & 1/4" mast. Antenna(s)
Not Included.
$16.95 each
DBLBRKT
tuneable-tip antennas allow adjusting for minimum VSWR.
CLICK HERE to read more about our HF DIPOLE SPECIAL!By combining a pair (two) of the single band HF Mobile (loaded) tuneable-tip antennas above, you can have an ideal, single element, horizontal dipole (beam). This type antenna opens the world of HF communications for the apartment dweller, RV HAM, field-day operating, and a variety of other uses and applications. The packages described below include two antenna, the Double Antenna-Bracket (DBLBRKT), and mounting hardware
$ 39.97 DBLSPCL (without BALUN) With BALUN, see "DBLCOMBO", below.
75 Meters→, 40 Meters→
17 Meters→
6 Meters → By combining a pair (two) of the single band HF Mobile (loaded) tuneable-tip antennas above, you can have an ideal, single element, horizontal dipole (beam). This type antenna opens the world of HF communications for the apartment dweller, RV HAM, field-day operating, and a variety of other uses and applications. The package described below includes two antenna, the Double-Bracket (DBLBRKT), mounting hardware, and BUX BALUN (UNUN). $AVE $$$$$, ADD the BUX UNUN , shown below, BOTH, DPLSPCL & BUXUNUN, for only $ 54.97, ORDER, DBLCOMBO
75 Meters→
17 Meters→
6 Meters → We accept:
BUX COMM corp.
Order Line, Monday - Friday 10 AM to 4 PM 1 - 4 3 4 - 5 3 4 - 88 73
or FAX your order, 24/7 to FAX 1 434 525 7818
All text and graphics on these pages are ©®™ of G. E. Rogers Sr and BUX COMM Corp 1986 - 2005
