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#1
March 8th 06, 11:32 PM
posted to rec.radio.shortwave
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Why Antenna Tuners Aren't Necessarily Useful for Shortwave Listening - Question Shortwave Listening (SWL) Antenna Tuners - Do You Have An Opinion ?
On Wed, 08 Mar 2006 20:59:22 GMT, Telamon
wrote: In summery, in my opinion, a pre-selector would be a good bet to improve portable reception when connected to an external antenna especially the worse case single conversion units. Following that in usefulness would be an antenna tuner. People chasing DX with tabletop units might want to try antenna tuners where less useful for them would be pre-selector use. And, I would pre-sume the "pre-amp" is different from the pre-selector? bob k5qwg |
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#2
March 8th 06, 11:39 PM
posted to rec.radio.shortwave
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Why Antenna Tuners Aren't Necessarily Useful for Shortwave Listening - Question Shortwave Listening (SWL) Antenna Tuners - Do You Have An Opinion ?
On Wed, 08 Mar 2006 22:32:23 GMT, Bob Miller
wrote: On Wed, 08 Mar 2006 20:59:22 GMT, Telamon wrote: In summery, in my opinion, a pre-selector would be a good bet to improve portable reception when connected to an external antenna especially the worse case single conversion units. Following that in usefulness would be an antenna tuner. People chasing DX with tabletop units might want to try antenna tuners where less useful for them would be pre-selector use. And, I would pre-sume the "pre-amp" is different from the pre-selector? bob k5qwg A receiver pre-amp can get the signal (and noise) above the AGC threshold so at least the volume will be constant. A pre-amp between the antenna and the transmission line can keep the cable from attenuating the signal too much. However, at HF frequencies, line losses are for the most part inconsequential. |
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#3
March 9th 06, 12:18 AM
posted to rec.radio.shortwave
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Why Antenna Tuners Aren't Necessarily Useful for Shortwave Listening - Question Shortwave Listening (SWL) Antenna Tuners - Do You Have An Opinion ?
In article ,
Bob Miller wrote: On Wed, 08 Mar 2006 20:59:22 GMT, Telamon wrote: In summery, in my opinion, a pre-selector would be a good bet to improve portable reception when connected to an external antenna especially the worse case single conversion units. Following that in usefulness would be an antenna tuner. People chasing DX with tabletop units might want to try antenna tuners where less useful for them would be pre-selector use. And, I would pre-sume the "pre-amp" is different from the pre-selector? Good assumption. I'm not big on pre-amps because they add their own noise to the existing signal to noise but they can help. For an amp the be a help it must be low noise and the best location would be at the antenna. Amps are best used where you have a long run of coax. Other feature enhancements of the amp design can come into play to make them more valuable. -- Telamon Ventura, California |
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