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The
original WINDOM
Antenna tuners were few and far between. This being the case, it's a good thing the more up-to-date transmitter's used Pi-Section output tuning. Yes, I wrote, "transmitter's;" Transceivers were unheard of in those days..... Later the "Benton Harbor Lunchbox" came along, and soon the "gooney-box" (Gonset VHF Transceiver) made the scene. For the newbies to HAM Radio, a "Benton Harbor Lunchbox" was a super-regenerative receiver in a small metal enclosure with a two meter (AM) transmitter that frequency-doubled in the final RF stage, the end result was about one watt to the antenna. In the beginning, Heath Company made three models, one for six (6) meters (SIX'er), one for two (2) meters (TWO'er), and later, they made a ten (10) meter version. In 1958, the ten meter version found its way onto the Citizen Band. The first two "lunch-boxes" picked up the aliases, SIX'er & Two'er.
In the beginning, Heath Company made three models, one for six (6) meters "SIX'er"
HW-29 1957, and HW29A 1960,
In 1958, came one for two (2) meters (TWO'er), and later, they made a ten (10) meter
version. In 1958, the ten meter version found its way onto the Citizen Band. The first two "lunch-boxes" picked up the aliases, SIX'er & Two'er.
All three were the same style and look as the photo above.
SPECIFICATIONS:
Receiver type: Superregenerative detector with RF amplifier stage.
Sensitivity: Usable with signals as low as 1 microvolt at antenna terminals.
Speaker size: 3�" (round).
Audio power output: Approximately 1 watt (undistorted).
Transmitter power input to Final RF amplifier: Approx. 5 watts.
Frequency control: Quartz crystal: 3rd overtone, 8 mc fundamental, 6 & 2 meter, (not supplied).
Power requirements: 6V @ 1.8 amps or 12 V @ 0.9 amps (10 meter), 6V @ 2.35 amps or 12V @ 1.2 amps (6 & 2 meter). Cabinet dimensions: 8" H. x 6" D. x 9�" W.
As for the Gonset Communicator (Gooney Box), Gonset built a more expensive two-meter AM rig (transceiver), and employed a super-het receiver to provide more selectivity. However, during band-openings, it was difficult to tell the difference between the lunch-box receiver and the gooney-box receiver.
The GONSET Six Meter communicator transceiver came next, it also had the alias,
"the Gooney Box", model G-50. Note the transceiver VFO points to 50.4 mHz. We would call CQ on this frequency and "tune-around" for return callers. The separate receiver dial (left) is used to "tune-around" for stations returning a call, or calling CQ. As-built, the G-50 ran 25 to 30 watts, depending on who you were talking to. NO, it was NOT push-to-talk, notice the "receive/transmit" switch, center, bottom row. This was the manual way we implemented ... er, uh.. well early "fumble-finger" PTT. Early models had a 5763 in the final, and later models employed a 2E26. Later some of us would substitute a 6146 for more power. If the owner of a Gooney box wanted to walk on the wild side, he/she could replace the final with a 6146 "B version" (with porous carbon plate), change the cathode resistor from 330 ohms, to 120 ohms (2 watts size) ... but then there was a plate "current" problem... WOULD the power supply handle it???? ! Geeves, do you smell smoke?VHF was fun, but most of our
enjoyment was on HF;
September 1949, I was exhausted from climbing poles and
trees to move, remove, add, or change my single-band HF antenna's. In those
younger years of my HAM radio hobby, I had used single band dipoles and
doublets for almost every HF Amateur band. I had tried long-wires, doublets,
dipoles, and Zepps, but again, operation was restricted to single band
operation, maybe two bands at most. The trick of it all, was to remember and
change the plug-in "tank-coil" to match the antenna band. My ole 807 rig was
a home-brew, that I had built on an old Atwater-Kent radio chassi. I had wound the
tank-coils on phenolic, plug-in coil forms (No, it was NOT a pi-section,
tank-circuit, it was link coupled, no less).
Enter; THE WINDOM:
Call it what you like, OCF, OCFD, or the name for which it is named...
its namesake is Windom. The Windom was, is, and will be the number one
antenna in the world for many years to come. The Windom was first
designed in 1923. It was fed by a single wire (coaxial cable was not
around in those days), The designer William Litell Everitt (his photo
is shown elsewhere on this page), brought it to the world in 1923, and later
wrote a brief about it in 1926.
A detailed article by Loren G Windom, W8GZ
written in the September, 1929 issue of QST Magazine. The Windom
gained it fame then and many times through the following years. I had heard of the "Windom" and
read a few articles about the Windom, but most of my thoughts were ...
ho-hum.. just another off center fed (OCF) dipole fed a bit off-center. Then one fall evening in
1949, at a
meeting of the GARC in the old "Sea Scouts" club house near the Coosa River
in Gadsden, Alabama; I listened as some of my "Elmer's"
discussed the Windom
all-band HF
antenna. It was when Jack Kennamer, (W4YPC) (SK), mentioned
That last phrase caught my undivided attention. "all HF
bands, ..etc" What !
To think that I could hang a Windom, and no longer have to
climb the poles and trees to hang another (single band) HF antenna was great
news to me. To be able to use it without an antenna tuner was
icing-on-the-cake. For a kid without extra funds, an antenna tuner was a luxury that I could
In those days, a BALUN was unheard of. My Elmer's described,
a means of connecting the coax to the off-center fed antenna using a lossy,
nine (9) turn coil of the coax feed-line at the feed point. This coil of
feedline coax formed a "de-coupling" loop. The de-coupling loop provided a
crude means of matching the feed coax to the antenna, and at the same time,
it would reduce the "re-radiation" (RF currents) along the outside (shield)
of the feeder coax. Later I began to study something called a "BALUN." In 1958 I read
more papers by Gillette Guanella which referenced a �current� type BALUN.
then I came across 
Figure 11, The graphics shown here represent the BUXCOMM
Windom at an elevation of 35 feet above ground,
operating at 14.17 MHz. A 4:1 "current" BALUN is employed with this
configuration.
UP CLOSE, dealing with the reality of ground influence: PLEASE, Pay close attention to what I'm about to say.
l Impedance at the feed point of the Windom decreases at resonance as the height above ground decreases !
Having made this statement, I should clarify how we arrived at this axiom.
Here in the BUXCOMM lab and our antenna farm, we made many tests with the Windom at various heights above ground. After many, and I mean "many" trials with the Windom at various heights above terra-firma, we found optimum performance at thirty-three (33') feet above ground while using a 4:1 BALUN at the feed point.
When we raised the BUXCOMM Windom above 35 feet (raised to 45') we found the feed-point impedance at 75 meters rose to 266 ohms. To make our Windom appear at a more constant impedance, at the same operating frequency, we made a change in the BALUN ratio from 4:1, to 5:1. With our 5:1 BALUN (model MM51), the impedance at resonance remained fairly stable when our Windom is 40+ feet above ground. When in doubt, use the following rule-of-thumb to match/balance your Windom and BALUN;
Antenna height above ground:
20 to 40 feet (optimum performance) use Windom with 4:1 BALUN, 50>200 ohm (BUXCOMM model MM41)
40 to 55 feet, use Windom with 5:1 BALUN, 50>250 ohm (BUXCOMM model MM51)
55 to * 70 feet, use Windom witn 6:1 BALUN, 50>300 ohm (BUXCOMM model MM61)
BucK4ABT
* No test results available above 70 feet
Today we have toroid cores and BALUN devices that provide a more efficient means of coupling RF energy to the antenna (reducing the VSWR, "standing-waves"), while performing better impedance matching. In the drawing shown above, I've drawn the exact dimensions of the Windom I built in 1949. The only differences in my Windom of 1949 and today are:
1) the material the insulators are made of, and 2) I've substituted a 4 to 1 BALUN for the (lossy) 9 turn, 8 inch diameter, decoupling loop.
As I soon learned, this is one of the best and least expensive HF multi-band antennas ever made. It appears as an off-centre-fed (OCF) dipole. This off-center fed design is actually the way the first Windom antennas were designed. The short side of this story is: the early Windom's were fed with a single wire (non-coaxial) which allowed the RF to radiated freely inside and outside the HAM shack.
UPDATING THE "ORIGINAL" WINDOM:
Using an open-wire feeder from the transmitter to the antenna was somewhat dangerous when running power levels above 50 watts. This is in difference to today's rules regarding RF radiation exposure, so to prevent this radiation by the feeder wire, we have adopted the use of coaxial cable to feed the Windom antenna. In order to do so, we had to move a bit further away from center than the designer of the Windom had.
With the Windom more than 55 feet above ground), we found a more suitable feed point that was closer to 33 percent off-center. This point comes closer to being a 226 ohm feed-point, and since we adapted the Windom for coax feed, we now use a 1 to 4 (MM41) current BALUN when our Windom is 25 to 35 feet above ground. We use a 1 to 5 (MM51) current BALUN when our Windom is 40 to 50 feet above ground.
We have moved to a more desirable feed-point (33 %) offset, and used a 4:1 BALUN (25 to 35 ft above ground or a 5:1 BALUN when we have the Windom center 40 to 55 feet above ground. When in doubt, use the 4 to 1 BALUN. In either case, the 4 to 1 and 5 to 1 BALUN's are more efficient than a 6:1 BALUN.
Using a 4:1 or 5:1 BALUN at the feed-point of the Windom antenna, we can operate without the use of an antenna tuner. The Windom is an uncomplicated, easy to build, harmonic related antenna. If we are the owner of an antenna tuner then by all means use it. Since I run 200 watts (or less) I for one don't like the idea of placing too many obstacles in line with my antenna, because each transition from one feed-line, tuner, or other transmission line transformer simply adds more losses into the equation and thus reduces this wonderful antenna's high performance.
Today, many radio amateurs are using multiband Windom antennas with more than satisfactory results. It would not be without reason that Windom antennas are being employed during IARU HF World Championships! and most of all, by "high-stake-contests." The complexity of feeding other dipoles and doublets, the losses in dipoles with traps, and the esoteric marketing of some other antennas seem to appeal to them more. Perhaps many young hams ignore the multiband Windom antenna because of its sheer simplicity and may be thinking it is too good to be true. Think about it, and while you are doing so, remember, the more trinkets, and unnecessary inserts that are placed into the RF path to the antenna are simply "window-dressing" or gimmicks. These added "gimmicks" become an obstacle or loss to that extra bit of RF signal that could have made that rare and needed contact in a contest pile-up. The original coax fed Windom has proven itself many times over, to be the number one wire type antenna with the most versatile and valued performance record in the HF communications world.
Remember the axiom: "When you have reached perfection, anything more becomes a point of diminishing returns." Enough said!Trust me on the above paragraph, as I have experimented with every Windom and Jpole concept or design that can be imagined. Having built and sold thousands of these two antennas, I've found that It's difficult to improve on perfection.
80 through 6 meter WINDOMs are completely assembled
↓|
Similar to WINDOMs shown above, These WINDOMs are completely assembled, ready to connect the coax, and erect. BUXCOMM Windoms are power rated at 1000 watts SSB and include all insulators, high-tensile strength, super flexible PVC covering, Power-Flex, tinned, copper wire, connectors, and BALUN. Our High-power versions are rated at 2000 watts and are identified with an "HP" in the model number. See coaxial cable and related items below. You can be on the air in no time, with any of our Windoms.BUXCOMM Windoms are the choice of Hams, World Wide
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Figure D
The Windom can be installed as a Droop-End (see figure D below) or as a sloper, but in no case, should the angle be greater than 90 degrees against itself. To use an angle that folds against the pattern of the opposite end, or the feed line of the Windom, could change the impedance of the feed-point, change the multi-band features, and most important, destroy the radiation characteristics of the antenna. |
A touch of
Class, The Windom and the
J-POLE
By Glynn E. "Buck" Rogers Sr
(68 years as K4ABT)
The J-POLE has been around since the early days of HAM Radio, and is a direct descendant of the "Windom" Like the Windom or ZEPP, the J-POLE is a spin-off, or a modified WINDOM for VHF and UHF. One of the first articles I wrote about the J-Pole was in HRC magazine in 1958. Since 1958, I've written several j-pole articles in other HAM Radio publications.Here, my references are to the early, 1923 (version) Windom (Article by Loren G. Windom September 1929, QST magazine) . If you look at the feed of the early Windom that was fed with a single wire, you may soon see the similarity between the Windom, ZEPP, and the J-Pole.Look close at the configuration of the Jpole and the Windom, and you will understand why in many of my articles in CQ Magazine and other publications, that I often refer to the Jpole as a Windom, with the short section folded back on itself to form the parasitic element. It is for this reason that I feel these are two of the best antennas ever designed.Having said this, you will also note that the Windom (and the Jpole) are powerful antennas that provide outstanding performance on all bands above the band for which they are cut or designed for. The reason these two antennas perform so well (as Multi-Band antennas; Windom for HF & lo VHF, Jpole VHF & UHF), is because they operate at harmonics of the fundamental or lowest frequency for which they are cut/designed. To add additional feeders (ladder-line), other than 50 ohm coax or UNUNs is a waste of RF energy. Only 50 ohm coaxial cable and a BALUN at the feed-point is all that is necessary. Anything more, adds losses into the equation that cannot be overcome after-the-fact.
From: Richard
Soikkeli
Sent: Monday, May 19, 2008 11:35 AM
To: [email protected]
Subject: Thanks for your fantastic Windom antenna!
| Dear Buck, Thank you so much for your patient technical help and the Buxcomm Quality windom antenna. 2 weeks ago down came the 102' G5RV and up went the 802136 BUXCOMM Windom. Now I am filling the log book with countries I rarely could even hear before, much less work, even with 500w CW. I have "busted" some pile ups with a first or second call and got real 599 rpts from DX over 8000 miles away. The low noise factor and gain does the trick. Also, I don't have RF into my son's computer speakers any more and I'm sure the neighbors are happier. I am advising our Field Day team to ditch the g5rv's as they don't compare at all as you told me would be the case. I only wish I had heard about BUXCOMM Windom's sooner and had more fun working DX over the years. I just installed a 2nd windom for my jr. high ham station. Now its time to break out the QRP rig and see what it will do too. I will be ordering more parts soon. 73 and thanks again, Rick AE6RS |
To manage both CW and Phone portions of the HF bands with the Windom, some "pruning" of the elements L1 & L2 can be made. Pruning (reducing) the length of L1 & L2 may cause an increase in VSWR at the lower ends of the band(s). Always remember to make the cuts proportional to each element. If you remove 12 inches (1 ft) from L1, remove only six (6) inches from L2.... If you remove 2 feet from L1, remove one (1) foot from L2.
Do not remove more than 3 feet total (L1=2 ft, L2=1 ft)The Windom above is cut for the
CW portions of the HF bands.For the technical minded Windom builder, we opt for the 4:1 BALUN because it is; more efficient, and weighs less. Another nice feature we found using our Rhode & Swartz Antenna Systems Analyzer, the Windom exhibits similar feed-point impedance across the bands from 75 through 6 meters.
A word to the wise.... NEVER make any angle of the Windom (or any flat-top antenna) more than 90 degrees. Ends can hang down, from a horizontal plane, but do not allow the angle to be tighter than 90 degrees e.g. 75, 45, degrees etc. A Windom may also be installed as an Inverted Vee, as long as the Apex (Point where BALUN feeds the Windom) is not sharper than 90 degrees.
The Windom is suitable for mounting as an inverted V, supported between two masts, tower, or trees. The Windom wire elements must not come in contact with limbs, vegetation or metal objects. In practice, try to keep both ends (wire elements) of the Windom three (3) or more feet away from any limbs, vegetation or metal objects.The BUXCOMM Windom can be purchased in several different band or lengths. The number of bands covered is determined by the length.
The 160 thru 6 meters version is approximately 260 total length. BUXCOM P/N 166260 With Current BALUN attached The 75 thru 2 meters version is approximately 130 ft total length. BUXCOM P/N 752130 With Current BALUN attached The 80 thru 6 meters version is approximately 137 ft total length. BUXCOM P/N 806136 With Current BALUN attached The 40 thru 6 meters version is approximately 66 ft total length. BUXCOM P/N 40670 With Current BALUN attached The 20 thru 6 meters version is approximately 37 feet, total length. BUXCOM P/N 20634 With Current BALUN attached
AN UPDATE:
Since writing this article several decades ago for a major HAM radio magazine, I've received tons of mail (and eMail) asking for more information, especially with regards to my 160 meter version;
The BUXCOMM model 166260 Windom antenna is a horizontal wire, multi-band antenna intended for use without an antenna tuner on 160, 80, 40, 30, 24, 20, 17, 15, 10, 6, abd 2 meters. The WARC bands of 30, 17, 15, and 12 meters by using an antenna tuner. The antenna wire is made of 61 strands of silver flashed wire and covered with non-metallic, super-flexible PVC insulation. Each end of the BUXCOM Windom�s have end insulators made of high tensile strength TyNYTE. The Center insulator is also Tynyte, and is fed by customer�s choice of either a 4:1 or 6:1 BUXCOMM MasterMatch BALUN transmission line transformers. The BALUN feed is attached near the one-third offset point according to the feed-point required by the BALUN ratio (200 ohms/4:1, 250 ohms/5:1,or 300 ohms/6:1). By using a different feed-point for 4:1 BALUNS, a slight increase in antenna efficiency is realized when using the MM51 (243 ohm) feed which results good VSWR on all referenced HAM bands. The antenna is suitable for mounting as a dipole, supported between two masts, tower, or trees.
The Windom wire elements should not come into contact with any limbs or other vegetation. Here's why;
The sky-blue insulation on the wire elements of our Windom antennas provide esthetic blending with surroundings, added tensile strength, and most important, it prevents oxidation of the wire. Oxidation can wreak havoc after a few years exposure to the elements.
A few new HAMS do not understand why
we advise against allowing the wire elements (although insulated) to come in contact with metal objects, tree limbs, and similar vegetation. Here, insulation does not prevent "proximity influence (added capacitance), and RF absorption" by nearby vegetation, be it limbs, or metallic objects. The same thing happens when the "sap" is up in the limbs, as happens when the antenna elements come in contact with, or near metal objects; stray capacitance, both inductive and capacitive will surely detune a well engineered antennaThe BUXCOMM Windom�s may also be mounted as an "inverted Vee". Do not exceed 90 degrees when erecting as an "inverted Vee". Specifications: Frequency range: 1.8 � 2.0 MHz 3.5 � 4.0 MHz 6.8 � 7.4 MHz 13.9 � 14.7 MHz 27.8 � 29.8 MHz 49.5 � 54.0 MHz Feed-point Impedance 50 ohms VSWR <2.0:1 Horizontal Polarization (If suspended as an Inverted Vee, do not exceed 90 degrees) Maximum power 1200 Watts SSB, 750 W AM/CW, Wire Length model 166260 = 260ft. WARC bands of 30, 17, 15, and 12 meters by using an antenna tuner. Now-a-days, I see a lot of knock-offs of the windom, they even try to change the name or use acronyms and try and relate it to the dipole.
The Windom is still a Windom, regardless of what they call it. As with the "apple." The apple is still an "apple" regardless of what other name they try to give it!Having said that: Here then is "the rest of the story."
First of all, we'll address the formula, and how to determine the length(s) of each section, using the same old formula that I used in 1949.
Long side.... = 468, divided by the frequency, then multiply by .64 (= Feet)
Short side.... = 468, divided by the frequency, then multiply by .36 (= Feet)
The
"Windom Antenna" was described by Loren G. Windom in QST magazine, September
1929. Pages 19 through 22. It is named after its inventor/designer.
Loren Windom, W8GZ, was first to reveal the antenna to the radio amateur community by describing the antenna in the September 1929 issue of QST. Although it was first build and tested by William Everitt (see photo), it was by Windom's name that the antenna became known.
The Windom antenna is an off-center fed dipole with an unbalanced coax feedline. In 1937, the Windom was first described as a compromise multiband antenna. The antenna can be employed on 80, 40, 20 and 10m with considerable, though acceptable levels of VSWR. What became perhaps the most popular 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 same dimensions as the multiband Windom antenna, but fitted with a 200
Ω to 50 ohm, (4:1) balun in its feedpoint and fed with coax.In recent years, some operator's are using 300 to 50 ohm, or 6:1 baluns. They base their decision on the simple math that the feed point is three (3) ohms closer to 300, than 200, simply because the feed-point of the Windom is 243 ohms nominal. Has anyone ever heard of "surge-impedance?" In tests, we've found, there's no significant difference in performance either way. Therefore, the trade-off is a matter of personal choice. Mine of course, is the Windom with a 4:1 Current BALUN (MM41 or MM41XV). If you plan to run more than 1000 watts SSB into our Windom, we suggest you request our Windom with the MM41XV Current BALUN rated at 1.5kW SSB.
Here are some final notes:
In our BUXCOMM BALUN's, we make it a point to polarize the posts of our MasterMatch series, identified by a RED or BLACK dot, or ring on the brass terminal posts. This provides the user with a benchmark that allows the BLACK post to be used towards the "cold" side of the antenna and the RED post is connected to the long, or "hot" side of the antenna. Some old-timers of my vintage, refer to the cold side of the antenna as the "parasitic" element.
As a point of interest, in some installations, the coax feed-line may pass through the RF field of the antenna, RF current can be introduced into the feed-line after the balun. In this situation, a 1:1 Current Choke should be inserted into the feedline near the feed-point of the antenna.
A few notes about "SkyWires" or, the full-wave Loop Antenna
Loop antennas have a fairly low impedance when they are built one (1) wavelength in circumference. The low feedpoint impedance at harmonic multiples of the resonant frequency as opposed to dipole antennas, have low feed-point impedances at ODD multiples of the resonant frequency.
When a
Full-Wave Loop is operated near resonance on the desired band, a 2:1 balun works very well, when using 50-ohm coaxial cable to the radio from the balun, VSWR at resonance will normally be below 2:1. An external antenna tuner is not required. If necessary, the transceiver's internal antenna tuner may be used.Typical SWR Plot of full-wave horizontal loop at approximately 40 feet above average ground using BUXCOMM MM21, 2:1 balun should exhibit an VSWR at resonance below 1.5:1.
Application Notes for BUXCOMM BALUN`s
Definitions:
BALUN = Asymmetrical to Symmetrical; UNUN = Asymmetrical to Asymmetrical1:1 BALUN: 50 ohms to 50 ohms, or to feed dipoles and
similar antennas with 40 to 75 ohm feed points.
BUXCOMM model MM11
1:2 BALUN: 50 to 100 ohms. This Balun is suitable for
feeding Vertical Antennas, Quads, Loop antennas and Ladder Line
antennas.
BUXCOMM model MM12
1:4 BALUN: 50 to 200 ohms. This Balun is suitable for
the coupling 50 ohm coaxial cable to Windom�s, and off-center-fed antennas.
BUXCOMM model MM41
1:5 BALUN: 50 to 250 ohms; Suitable for
coupling 50 ohm coaxial cable to a Windom�s, when the Windom is more than 50
above ground.
BUXCOMM model MM51
1:6 BALUN: 50 to 300 ohms. This BALUN is suitable for
the adjustment to asymmetric fed dipoles such as Windom�s, G5RV, and zepp
antennas. The BALUN is fed directly to the Windom and similar antennas. With
double-zepp and G5RV antennas and use of asymmetrical feeder, the BALUN is
positioned before entry of the cable into a building.
BUXCOMM model MM61
1:9 BALUN: 50 to 450 ohms for coupling
Asymmetrical to Symmetrical feeders.1:9 UNUN: asymmetrical to asymmetrical (unbalanced to unbalanced) Long wire antennas, Ground Plane`s, Verticals, and some types of "beverage" antennas,.. etc.
1:16 UNUN: Similar to above application; asymmetrical to
asymmetrical (unbalanced to unbalanced) Long wire antennas, Ground Plane`s,
Verticals, and some types of "beverage" antennas,.. etc
An Improved G5RV Antenna:
The original G5RV antenna was developed by Louis Varney G5RV for 20 meters. Although his design was a good one, he used the 450 ohm ladder line as a feed-line-to-antenna impedance match, and without the use of a BALUN. We discovered that feeding the 450 ohm ladder-line directly with an antenna tuner, left us with a shack full of RF�HOT mics, hum, and in some cases, we had "squeals" from rectified RF getting into the microphone audio path, within the transceiver, a sure sign of RF-Feedback (base rectification).
To make the G5RV more "user-friendly" and with less RF exposure within the HAM-shack, we added an MM11 BALUN at the lower end of the 450 ohm ladder-line, and from the asymmetrical input of the MM11 BALUN (outside the HAM shack), we used 50 ohm (low impedance) coax to reach the antenna tuner inside the HAM shack. We�ve found that this improvement to the G5RV has put more of our transmitted RF into the elements of the antenna, and made the antenna virtually noise free and reduced re-radiation as much as 85 percent.
Without using an external antenna tuner, we�ve found that our transceiver will work into the 50 ohm coax and the MM11 BALUN with VSWR below 2:1 on the bands the G5RV is cut for.
By making the additional BALUN and coax improvement to the original 20 thru 10 meter G5RV, it is now possible to build the G5RV for more bands, and thus cover lower bands and frequency�s. We now have a means by which we can have an antenna that fits almost any real-estate configuration, from as little as
27 feet (8.2 m), (20 thru 10 meter bands) to 207 feet (64 m) (160 thru 10 meter bands).BUXCOMM now builds G5RV antennas in four (4) versions and lengths. Depending on your available space, you may choose the size and version to fit your needs and available real-estate space.
Model Bands/Coverage Overall Lengths BALUN
G5RV-16010 160 to 10 meters 208 feet or 63 meters
G5RV-8010 80 to 10 meters 102 feet or 31 meters MMG5
G5RV-4010 40 to 10 meters 52.5 feet or 16 meters MMG5
G5RV2010 20 to 10 meters 26.5 feet or 8,1 meters MMG5
Here's more commendation for our BUXCOMM Windom antennas:
From: M33Access Sent: Monday, October 16, 2006 2:55 PM To: [email protected] Subject: BUXCOMM WINDOM
Hello
I couldn't resist the opportunity to tell you about your Windom antenna I bought a couple weeks ago. I have been off the air for a number of years. Probably close to 15 to be exact. My oldest son got his ham ticket this past summer and started buggin me to get on the air. That's when I decided to bite the bullet and get on.
After working for days trying to make my old "Inverted V" work. I turned to you folks and your off center fed Windom. Since then I hung the antenna at the 70' mark on my tower and the long end to about the 55' mark on a tree in the back yard. My station is simple, I use the Kenwood TS-180s barefoot to the Windom. I love to work rtty and packet. I am using an ancient AEA Pakratt232.
I have heard DX that I never heard in my years of being a licensed Ham. I have worked Italy, England, South Africa and last night I worked a station in Chile. CHILE! Now that is at the other end of the world! This is so neat, I can't tell you how much I am loving your antenna. Remember this is barefoot. I have my dad's SB-230 amp, but it's not hooked up. I don't have the DIN plug for my 180 yet.
If you have customers asking how your BUX Comm Windom antenna works, give them my call and I will be happy to meet them on the air.
73, and thanks again.
Bob WB8UJB
From: Andy KA3ODJ
Sent: Wednesday, June 07, 2006 6:49 PM To: [email protected] Subject: 166261W100 Just wanted to let you know that your 166261W100 antenna here at KA3ODJ is working like Gang Busters. Purchased the antenna primarily as a 160 Meter antenna for the Internet Remote Base. The SWR and performance exceeded what I had expected, I have added it to the selection choices for the other bands. Can not wait to get the ends up higher, they are only 35" or so right now. Getting good reports from the users of the Internet Remote Base. No RF Problems at the coax end either, I also am using one of your Master Match at the antenna switch. I am running an Icom PW1 and in the past, I've had RFI issues in the shack resetting the computer, but no more, with this new BUXCOMM Windom, it's clean as a whistle. Feel free to give your antenna a try if you like. To operate Remote, You will have to download W4MQs software to get access. http://wpmq.com. Thanks for a great product at a fair price. Andy KA3ODJ
Our Windom Measurements
|
Freq mHz |
1.9 |
3.5 |
7.1 |
10.7 |
14.2 |
21.4 |
28.5 |
|
SWR |
1.8 |
1.2 |
1.8 |
1.55 |
1.33 |
2.1 |
1.25 |
|
Impedance |
233 |
218 |
158 |
161 |
280 |
256 |
190 |
Metric Conversion
|
INCHES To Millimeters Inches x 25.40 To Centimeters Inches x 2.54 To Meters Inches x 0.0254 From Millimeters M x 0.03937 From Centimeters C x 0.3937 From Meters M x 39.3701 |
FEET To Millimeters Feet x 304.8 To Centimeters Feet x 30.48 To Meters Feet x 0.3048 From Millimeters M x 0.00328 From Centimeters C x 0.03281 From Meters M x 3.28084 From Centimeters C x 0.01094 From Meters M x 1.0936 |
YARDS To Millimeters Yards x 914.4 To Centimeters Yards x 91.44 To Meters Yards x .9144 From Millimeters M x 1.094 x 10- 3 From Centimeters C x 0.01094 From Meters M x 1.0936 |
WINDOM, to ZEPP, to VHF J-POLE.
BUXCOMM BALUNS are more than just antenna matching devices:
* Help keep RF out of the shack.
* Provides maximum transfer of RF to the antenna.
* Elemination of radiation from the feeder cable
* Makes the antenna radiation pattern predictable.
* Reduces QRN and TVI to the neighbors.
BUXCOMM 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 Line-Isolator BALUNS may also be installed anywhere along the cable to prevent the destructive influence of induced RF currents (VSWR). The best location for the BUXCOMM LISO is to install it at the output of the transceiver or between the linear and the coax cable feed line to the BALUN at the antenna.
At BUX COMM, *
We don't cut corners!The components used in the manufacture of our BALUNs are of 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 extremely high temperatures. The binding posts are heavy-duty, tempered brass, with side-thru holes to accommodate either type loop-thru connection, solder-lug, or screw attachment. A double-shoulder brass capture nut is used to add a secure bite and improve antenna wire electrical connections.
G. E. "Buck" Rogers K4ABT 1950 Buck Rogers
ABC TV Dir of Engineering 1972
K4ABT 1979 w/18 ton CP, TV, Transmit Antenna
Up it goes, 2000 ft 1981
*Tech Support; Email;
[email protected]
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COMM Corp 1986 - 2008
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