I PERSONALLY REFER TO THEM AS A "MATCHBOX". Johnson ever actually trademarked the word "Matchbox". However I was unable to find any proof thatĮ.F. Other similar devices at the time were referred to as "Matching Network" or "Z-Match" (a specific type). This goes back to the 1950's to the days of the Johnson Viking Matchbox and Johnson Viking Kilowatt Some people believe that the word "matchbox" is proprietary and belongs to E.F. More Technical Answer: What tuners do by Steve Hunt, G3TXQ.Simple Answer: They match two devices with different impedances to each other.Just another name for the same thing.Ī Remote Matchbox is a matchbox which is located outside in the open, and it either tunes automatically, or is tuned manually by a remote control head, located in the shack.įunctionally, it is exactly the same thing as any other matchbox. Others use the term simply to mean "Antenna Tuning Unit". Some people use this acronym for "Automatic Tuning Unit", meaning an automated device for matching the antenna. If the antenna is already well matched to the transmitter, the internal loss (in every matchbox) actually reduces the power transferred to the antenna. In the presence of a mismatch, it enables the transmitter to deliver more power to the antenna system than it would without a matchbox. Unfortunately it doesn't always increase the power transferred to the antenna. Of increasing the amount of power that is transferred to the antenna. In my opinion a MATCHBOX is an independent device on its own, whose purpose is to be inserted between two devices (the transmitter and the antenna system) and match them together, with the intent Is the matchbox itself part of the antenna system, part of the transmitter, or an independent device on its own? Just assume that Antenna Tuner means the same thing as Antenna Matchbox. I can't change that and I won't even try. Most people seem to prefer to call a matchbox an Antenna Tuner. POSSIBLE EXCEPTION: If you are using a Longwire Antenna, where the wire itself begins inside the shack, at the matchbox, then perhaps it can be consideredĪs tuning the antenna (the military calls these Antenna Tuning Units) but in fact it is not changing the electrical/physical characteristics of the antenna. Therefore I prefer to say "match" and not "tune". To do that, the matchbox would have to be located at and be a physical part of the antenna.ĪND IF IT WERE PART OF THE ANTENNA, IT WOULD NOT NEED A SEPARATE NAME AND DESCRIPTION!īut it does match the antenna and its transmission line (the antenna system) to the transmitter. "matchbox" is descriptive of it's role in the process of delivering power to the antenna. In doing so, we usually are able to transfer more power to the antenna system. The matchbox's job is to match two devices with different impedances to each other. Why DJ0IP prefers the term "Antenna Matchbox" or simply "Matchbox"? NOTE 2: Just because power is efficiently transferred into the transmission line (with very little loss inside the matchbox), do NOT assume the itĮffeciently arrives at the antenna! Don't make that mistake! Transmission lines, ESPECIALLY COAX, can add significant loss to the antenna system. THERE IS ALWAYS SOME POWER LOSS WHEN USING A MATCHBOX. Necessarily mean that all of the power being passed through the matchbox to the antenna. NOTE 1: Just because the matchbox is able to matcht the antenna and transmission line to the transmitter with a perfect match (SWR = 1.0:1), that does not They are the names we call the device which enables a transmitter with a specific impedance (usually 50 Ohms) to efficiently transfer its power into a transmission line and antenna which have
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