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#15
March 5th 07, 12:28 AM
posted to rec.radio.amateur.moderated
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Tube equipment question
"Mike Coslo" wrote in message
6 wrote: If the only antennas we have are trapped verticals, tribanders or dipoles/inverted vees cut for the band to be used, we might get away with not having to use a tuner at all. Still there are likely to be frequencies significantly removed from the antenna's resonant frequency where one might need a tuner to enable the transmitter to make full power. We aren't likely to need a wide range tuner for those times. A simple T-match will likely enable us to find a combination of settings which will present a low VSWR to the transmitter. The main alternative is to have a variety of antennas which present a VSWR of under 2:1 to a transmitter. That brings up a related issue. Lots of Hams today are restricted to one antenna, yet they would like all band operation. I think it would be a great idea for a manufacturer to have a transciever that included a tuner right in the rig itself. - 73 de Mike KB3EIA - They do exist, although being primarily interested in VHF/UHF operation (we only recently had the morse requirement for HF dropped over here in the UK, but that's another topic..!!) I've had little experience of them. I do remember vividly using a Drake commercial HF transceiver (I think it came out of a ship's radio room) back in the late 80's at a special event station that had this feature, you could operate on any band without any form of tuning at all, although of course how much power would get out on a really bad antenna is debatable ;-) Of course if you've enough money, there are those antennas that tune themselves. A friend has a 3-element beam that is computer controlled; as you tune across the bands, the elements automatically adjust themselves to the correct length..! I don't recall the make/model, but it is of American origin, does anyone know of it..? 73 Ivor G6URP |
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