The Highly Portable, Ultra-light Multi-Band. Price, Quality, Service - Now pick all three. The Micro Windom is likely as complicated as it will ever get for us. We will never tire of extolling the virtues of the simple dipole antenna, especially resonant ones.There are times however, when multi-band and other dipole variants become extremely useful. They are still dipoles and function as dipoles. Ham radio operators may have noticed the recent volatility and unpredictability of the amateur radio bands. Therefore, especially for those of us who appreciate the elegance of low power, our antenna systems need to make the most of what power it is given, and exploit any advantage that it can.
In that spirit, we are happy to introduce our latest offering. Like all of our other antennas, it is extremely light , extremely portable and exceptionally rugged. This is antenna is designed for use up to 50 Watts SSB. Our Micro Windom dipole variant with integrated 4:1 Ruthroff Balun placed at the apex, as depicted in the photos & diagrams, tested and described below.
Made in America from materials sourced from U. A vertical section complete with connectors, to be placed between balun and choke. A miniaturized, portable RF Choke to be connected at the feed-point.
A BNC end protector cap for each connector (3). A 7.5" x 10". If available, QSO details will be enclosed. And don't forget to visit the store here.
Antennas of similar design have many different names. Depending on who you ask, it's called a Carolina Windom, a New Carolina Windom; others just call it the Windom.
For our purposes here, we have decided to call it the Miniature Off-Center Fed Micro-Windom Dipole Variant, or Micro-Windom for short. As the name suggests, the Micro-Windom is a variant of the Off-Center Fed Dipole with two critical differences. First, the integrated balun at the apex is a Ruthroff-type voltage balun rather than a current balun.
It allows for 4:1 impedance matching that results from feeding the antenna approximately 1/3 of the distance from the end but does not impede RF flow back to the feed-line. Second, a RF choke is added 10 feet below the apex. Note: some designs call for a line isolator in this section. Line isolators are big, heavy and typically over-engineered so that they may function across a broad range of power levels. We are placing a relatively large inductance at the end of the vertical radiator sufficient for 25 watts (SSB) or less, so we will just say RF Choke.What this configuration does is to allow the 10 foot section of the feed-line between the balun and the choke to radiate. The resulting radiation pattern includes low-angle emanations that are useful for DX operating. Admittedly, this is controversial in some circles especially when operating at power levels of 100 watts and above, but there are positive results to be gleaned from this antenna configuration within certain parameters. From our perspective, these parameters are QRP Operation and operation on frequencies above 7.00 MHz. Our practical experience with this antenna also bears this out. So with this in mind, we have developed the Micro-Windom, optimizing it for ultra-light portable operating. We make antennas for fun.
In producing the Micro-Windom for personal use, it was noticed that it had better characteristics for operating DX. Any DX, but especially QRP DX, can be challenging. We believe this antenna configuration yields the highest probability of working long distance stations (particularly Europe, Central & South America, and the nearer Asian stations) than any other of the antennas we make. Note the screen captures of the PSK reporter map in the photo section.Fabricating and testing these antennas has been found to be exceptionally labor intensive, so only a limited number will be produced. People familiar with our antennas already know that compact, light, effective performance. Means a dipole, or in this case a dipole variant. The difference here is that we now offer all of the highly portable and durable characteristics of our regular antennas in the. For 40 through 6 meters.
This antenna requires a tuner. Fortunately, there are many lightweight, portable tuners available and many newer radios include an auto-tuner.If you are so equipped, then our Micro-Windom is for you. Our antennas are solidly built, rugged and designed to be a high-performance value alternative to much more expensive and fragile equipment. The antenna is a 40 Meter half-wave dipole fed 1/3 of distance from the end. This raises the feed-point impedance to approximately 200 ohms. To compensate, the antenna is equipped with a 4:1 Ruthroff style, voltage balun embedded between the BNC female connector and the 22 AWG UL1007 radials (See schematic with photos).
The balun uses one (1) FT50-43 ferrite toroid. Between the balun and the feed-point, a 10 foot section of RG58 or RG8X coax, complete with BNC male connectors is supplied.
Attaching to the end of the coax is a RF choke that consists of 3 BNOC-43 ferrite apertures with multiple windings. The result is a highly functional dipole variant for use on 40 meters through 10 meters. Using a Yaesu FT-817ND as a transmitter and a MFJ portable tuner, The Micro-Windom tunes between 1.1 to 1.5 SWR on all bands 40 through 6 meters.
During testing it is strung between 25 & 30 feet from the ground and fed with approximately 30 feet of RG-8X coaxial cable. So the testing involves: Radio. Antenna, the same way every time, every antenna. As with our OCF Dipole, a screen capture map taken while testing is included. Perfect for outdoor or stealth operation.Perfect for a small base station antenna. Working QRP DX can be an immensely satisfying experience that our. It's also a great, inexpensive gift to give to those involved with amateur radio that requires no additional finishing. It fits easily into a backpack, glove box, bag or carrying case. The item "40-6M Micro-Windom OCF Multi-Band HF Ham Radio Antenna Complete" is in sale since Monday, August 24, 2020. This item is in the category "Consumer Electronics\Radio Communication\Antennas\Ham, Amateur Radio Antennas". The seller is "timortiz" and is located in Waukegan, Illinois. This item can be shipped to United States, Canada, United Kingdom, Denmark, Romania, Slovakia, Bulgaria, Czech republic, Finland, Hungary, Latvia, Lithuania, Malta, Estonia, Australia, Greece, Portugal, Cyprus, Slovenia, Japan, Sweden, South Korea, Indonesia, Taiwan, South africa, Thailand, Belgium, France, Hong Kong, Ireland, Netherlands, Poland, Spain, Italy, Germany, Austria, Bahamas, Israel, Mexico, New Zealand, Philippines, Singapore, Switzerland, Norway, Saudi arabia, Ukraine, United arab emirates, Qatar, Kuwait, Bahrain, Croatia, Brazil, Chile, Colombia, Costa rica, Dominican republic, Panama, Trinidad and tobago, Guatemala, El salvador, Honduras, Jamaica, Antigua and barbuda, Aruba, Belize, Dominica, Grenada, Saint kitts and nevis, Saint lucia, Montserrat, Turks and caicos islands, Barbados, Bangladesh, Bermuda, Brunei darussalam, Bolivia, Ecuador, Egypt, French guiana, Guernsey, Gibraltar, Guadeloupe, Iceland, Jersey, Jordan, Cambodia, Cayman islands, Liechtenstein, Sri lanka, Luxembourg, Monaco, Macao, Martinique, Maldives, Nicaragua, Oman, Peru, Pakistan, Paraguay, Reunion, Viet nam, Uruguay.