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Serving HAM Radio since 1959, On the Web Since 1995

Order Toll Free Monday through Friday, 9 am to 5 pm, 1 800 726 2919 or 1 866 300 1969, (C) 1988-2012 ALL Times, EasternNO MINIMUM ORDERS, Same Day Shipping, except Sunday and Holidays BUXCOMM Corporation 115 LUENBURG DRIVE EVINGTON, VIRGINIA 24550

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A touch of Class, The Windom and the J-POLEBy Glynn E. "Buck" Rogers Sr (68 years as K4ABT)

above

"When you have reached perfection, anything more becomes a point of diminishing returns." Enough said!

It's difficult to improve on perfection.

J-Pole

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Windom

to know the difference and for heavens sake, DO NOT attempt building a J-Pole for seventy-five (75) meters.

FIGURE 1a

FIGURE 1b

number 12 or 14

(Fig 1A "D")

↑For 2 meters (145.000 to 146.000 MHz) the EXACT dimensions are:

A = 58 inches overall (Long, driven element). B = 19.5 Inches C = 2 Inches D = 1.8 Inches (space)

For 6 meters (50.500 to 51.500 MHz) the EXACT dimensions are:

A = 166-3/4 inches overall (long, driven element). B = 58-3/4 inches (short, tuning stub). C = 5.5 Inches D = 5 inches

USE BUX "VBALUN" withJ-Poles 1 kw VHF & UHF BALUN, BUX VBALUN

> CLICK HERE for on-line CATALOGHi-Q, toroid design, wound with teflon covered, silver wire.

For VHF beams, J-Pole matching applications, and construction.

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FIGURE 1a

Figure 1b

SAVE TIME BY USING THE HANDY J-Pole CALCULATOR BELOW.NOTE: Coax center conductor attaches to the "Long section" feed point.

Shield attaches to the short section feed point.

USE BUX "VBALUN" withJ-Poles 1 kw VHF Balun, BUX VBALUN

> CLICK HERE for on-line CATALOGHi-Q, toroid design, wound with teflon covered, silver wire.

For VHF beams and J-Pole matching applications, and construction.

An adjustable VSWR, 2 meter J-Pole

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BUX VBALUN should be installed at the antenna feed point, or where the coax or feed-lineattaches to the J-Pole antenna. BUX BALUNs are used to connect balanced antennas tounbalanced transmission lines, such as coax cable. Their primary purpose is to preventantenna (RF) currents from flowing down the outside of the cable (VSWR). Anotherfunction of the BUX BALUN41 is to match the impedance of an unbalanced coax to theantenna feed point. BUX LISO BALUNS may also be used as “line isolators” anywherealong 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, ferritecores.

CLOSE UP of the alternative coax feed method.

Use BUX VBALUN to couple coaxial cable to J-Pole.

My Hardware J-Poles from 1959 & BUXCOMM J2JAY (1995)

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In the early days of packetRadio, we used this Jpole as anIndoor antenna to

hit the local Packet Nodes (PacketRepeater). Unbelievableperformance when

suspended vertically near a window or off the patio. Gain is3.7 dbi MOL.

A=Benz-O-Matic propane torch; B=Lead-Free solder; C=Tapemeasure: D=Tubing cutter; E=Sharpie marking pen; F=Solder

Paste; G=1/2 inch copper caps; H=Hardcopy of the above

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drawing; I=Wet Towel; J=PreCut, ready to assemble parts ofthe 2 meter J-Pole.

BUXCOMM J Pole Calculator by BucK4ABT (C) 1992

When using the J pole Calculator below, refer to drawing above for A, B, C, & D.Center conductor to "Long Element" and Shield to "Short Element."

Enter Antenna Operating Frequency0 Freq in MHz

Calculate Antenna Dimensions

A (Longsection)dimensionis:

feet, inches, meters

B (Short

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B (Shortsection)dimensionis:

feet, inches, meters

C (Feedpoint)dimensionis:

feet, inches, meters

D(Spacing)dimensionis:

feet, inches, meters

Inside (spacing) dimensions are metal to metal measurements, NOT center to center.

2 meter version:

> CLICK HERE for on-line CATALOG

70cm version:

> CLICK HERE for on-line CATALOG

BUX VBALUN De-Coupling transformer

Primary use and application:Feed point isolation and matching for

J-Poles and VHF/UHF BEAMS.

This decoupling transformer prevents RFcurrents from traveling down the outershield of the coax. The input connector isan SO239 (female) and the outputconnector is a PL259 (male).

BUX "VBALUN" De-Couplingtransformer, has SO-239 (female) inputconnector. Output connector is 2 feetRG8X cable with Amphenol PL-259(male). BUX VBALUN is an UNbalancedto UNbalance decoupling transformerdesigned to be used by the Apartmentdweller or the RV ops when feeding J-Poles and similar VHF/UHF antennas.

$19.95 VBALUN > CLICK HERE for on-line CATALOG

Teflon ®™ E I DuPont corp.

Amphenol ®™ TYCO Corp.

The "VBALUN" is similar to our BUXUNUN, except constructed for VHF and UHF frequencies.

For all type of outdoor antennaconnections, BALUNS, Coax

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connectors, coax bulkhead entrypanels and more. Use Coax-Seal®to protect any outdoor connection orconnector. Coax-Seal is made of anon-conductive, non-contaminatingwaterproof material that remainsflexible at any temperature from -30°to 180°F. Coax connectors that arenot waterproof or have exposedsolder joints can weaken fromoxidation ! Coax-Seal is superior toelectrical tape or vinyl sealants formoisture protection. Each box ofCoax-Seal contains (60 inches x 1/2inch) five feet and will protect ten(10) connectors.

2.95 Order Code CS104

CLICK HERE to buy COAXSEAL

CAT#, CS104, For alltype of outdoor antennaconnections, BALUNS,Coax connectors, coaxbulkhead entry panelsand more.

TEMPERATURE CONTROLLEDSOLDERING STATION 50W 350 - 900° F

Features :manual temperature settingelectronic temperature controlpower-on LED indicationwith grounded output Specifications :heater power for soldering iron: 50Wtemperature variable control: 375-900°F

voltage supply: 115VACweight: 2.65 lbs.dimensions: 7 1/4" x 3 31/32" x 3 1/2"input power: 50VA max.

$ 24.90 Order VTSS5

> CLICK HERE for Tools & Solder Stations

The "Windom Antenna" was described by Loren G. Windom inQST magazine, September 1929. Pages 19 through 22. Loren Windom, W8GZ, was first to reveal the antenna to the radioamateur community by describing the antenna in the September1929 issue of QST. It was by Windom's name that the antennabecame known. The Windom antenna is an off-center fed dipolewith an unbalanced coax feedline.

In 1937, the Windom was first described as a compromisemultiband antenna. The antenna can be employed on 160, 80, 40, 20 and 10m withconsiderable, though acceptable levels of VSWR. What became perhaps the mostpopular multiband Windom design of all, was the German-made Fritzel FD4 antenna,described by the late Dr. Fritz Spillner1, DJ2KY, in 1971. It had the samedimensions as the multiband Windom antenna, but fitted with a 200Ω (4:1) balun atits feedpoint and fed with coax.

Today, many radio amateurs are using multiband Windom antennas with more thansatisfactory results. It would not be without reason that Windom antennas are beingemployed during IARU HF World Championships! and most of all, by "high-stake-contests." Perhaps many young hams ignore the multiband Windom antennabecause of its sheer simplicity and may be thinking it is too good to be true. Thecomplexity of feeding other dipoles and doublets, the losses in dipoles with traps andthe esoteric marketing of some other antennas seem to appeal to them more.

For more J-Pole information, CLICK HERE:

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Serving HAM Radio since 1959, On the Web Since 1992Order Toll Free Monday through Friday, 9 am to 5 pm, 1 800 726 2919 or 1 866 300 1969, Saturday 9 AM to 2 PM Eastern Time

NO MINIMUM ORDERS, Same Day Shipping, except Sunday and Holidays BUXCOMM Corporation 115 LUENBURG DRIVE EVINGTON, VIRGINIA 24550

BUXCOMM Tech Support is by expert Technicians and Engineers. *Tech Support; Email; support@buxcomm.com

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