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#1
January 26th 04, 08:40 PM
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Baluns & Long Wires
Hi.
Further to my last post............ This weekend i messed about with my long wire receiving ( only ) antenna. ( Length 20Mtrs, coax fed , earthed 10 mtrs from house). Yesterday i built a 9:1 balun / transformer .Placed it at my earth rod out side. I am not even sure if this is the right one for a long wire? Anyway.. reception on 20 mtrs now has much less noise now. The signal to noise ratio has vastly improved. Reception on other bands remains about the same as before i added the balun. (I used my Wellbrook loop antenna to compare signals.) My question now is... How do improve reception/noise on other bands ? Do i need a different balun or change the length of my wire ? What ever i have done seems to of peaked on 20mts ( 14Mhz). It would be great to get rid of the noise on 80mtrs for example. Any ideas or diagrams appreciated. Interesting stuff this ! Regards Jeff |
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#2
January 27th 04, 07:07 AM
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JEFF-UK,
QUESTION - Prior to 'making' your Changes did you do any Reception Testing and Record your Results ? FWIW - Our Memories are "Poor-Recorders-of-the-Facts: When it comes to all the 'factors' that make-up the Ojective Evidence and Subjective Judgements like a Radio Broadcaster's Signal Strength and the Background Noise Level {Signal-to-Noise Ratio} of a Shortwave Band. * Now multiply this by five to ten Broadcasters per SW Band. * Then multiply this by five to ten SW Bands. You now have 50 to 200 Observations to Memorize or Record. I 'favor' the "Write-It-Down" Method. Read Message # 556 Your ANTENNAS Journal-Ledger and Understanding the Shortwave Bands http://groups.yahoo.com/group/SWL-AM...na/message/556 Read Message # 88 Hooking-Up a "Balun" [Matching Transformer] to a Random Wire Antenna http://groups.yahoo.com/group/SWL-AM...nna/message/88 More Balun (Matching Transfromer Reading: * MLB Theory http://groups.yahoo.com/group/SWL-AM...na/message/340 * Magnetic Longwire Balun (MLB) - Help ! http://groups.yahoo.com/group/SWL-AM...na/message/173 * Magnetic Longwire Balun (MLB) - Build Your Own "DIY" http://groups.yahoo.com/group/SWL-AM...na/message/177 * Balun / Matching Transformer Reading List ( Long 43 Links ) http://groups.yahoo.com/group/SWL-AM...na/message/337 iane ~ RHF .. Some Say: On A Clear Day You Can See Forever. http://groups.yahoo.com/group/SWL-AM...na/message/502 I BELIEVE: On A Clear Night... You Can Hear Forever and Beyond ! .. .. = = = "JEFF UK" = = = wrote in message ... Hi. Further to my last post............ This weekend i messed about with my long wire receiving ( only ) antenna. ( Length 20Mtrs, coax fed , earthed 10 mtrs from house). Yesterday i built a 9:1 balun / transformer. Placed it at my earth rod out side. I am not even sure if this is the right one for a long wire ? Anyway.. reception on 20 mtrs now has much less noise now. The signal to noise ratio has vastly improved. Reception on other bands remains about the same as before i added the balun. (I used my Wellbrook loop antenna to compare signals.) My question now is... How do improve reception/noise on other bands ? Do i need a different balun or change the length of my wire ? What ever i have done seems to of peaked on 20mts ( 14Mhz). It would be great to get rid of the noise on 80mtrs for example. Any ideas or diagrams appreciated. Interesting stuff this ! Regards Jeff .. |
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#3
January 27th 04, 07:10 AM
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No. I just know 20 mtrs is very noisy here.
Now its much better on a signal to noise ratio. Every thing appears to be the same signal strengh on know frequencies. Cheers Jeff "RHF" wrote in message m... JEFF-UK, QUESTION - Prior to 'making' your Changes did you do any Reception Testing and Record your Results ? FWIW - Our Memories are "Poor-Recorders-of-the-Facts: When it comes to all the 'factors' that make-up the Ojective Evidence and Subjective Judgements like a Radio Broadcaster's Signal Strength and the Background Noise Level {Signal-to-Noise Ratio} of a Shortwave Band. * Now multiply this by five to ten Broadcasters per SW Band. * Then multiply this by five to ten SW Bands. You now have 50 to 200 Observations to Memorize or Record. I 'favor' the "Write-It-Down" Method. Read Message # 556 Your ANTENNAS Journal-Ledger and Understanding the Shortwave Bands http://groups.yahoo.com/group/SWL-AM...na/message/556 Read Message # 88 Hooking-Up a "Balun" [Matching Transformer] to a Random Wire Antenna http://groups.yahoo.com/group/SWL-AM...nna/message/88 More Balun (Matching Transfromer Reading: * MLB Theory http://groups.yahoo.com/group/SWL-AM...na/message/340 * Magnetic Longwire Balun (MLB) - Help ! http://groups.yahoo.com/group/SWL-AM...na/message/173 * Magnetic Longwire Balun (MLB) - Build Your Own "DIY" http://groups.yahoo.com/group/SWL-AM...na/message/177 * Balun / Matching Transformer Reading List ( Long 43 Links ) http://groups.yahoo.com/group/SWL-AM...na/message/337 iane ~ RHF . Some Say: On A Clear Day You Can See Forever. http://groups.yahoo.com/group/SWL-AM...na/message/502 I BELIEVE: On A Clear Night... You Can Hear Forever and Beyond ! . . = = = "JEFF UK" = = = wrote in message ... Hi. Further to my last post............ This weekend i messed about with my long wire receiving ( only ) antenna. ( Length 20Mtrs, coax fed , earthed 10 mtrs from house). Yesterday i built a 9:1 balun / transformer. Placed it at my earth rod out side. I am not even sure if this is the right one for a long wire ? Anyway.. reception on 20 mtrs now has much less noise now. The signal to noise ratio has vastly improved. Reception on other bands remains about the same as before i added the balun. (I used my Wellbrook loop antenna to compare signals.) My question now is... How do improve reception/noise on other bands ? Do i need a different balun or change the length of my wire ? What ever i have done seems to of peaked on 20mts ( 14Mhz). It would be great to get rid of the noise on 80mtrs for example. Any ideas or diagrams appreciated. Interesting stuff this ! Regards Jeff . |
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#4
January 27th 04, 03:14 PM
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JEFF-UK,
WHAT TO DO: Select from three to five strong International Broadcast Stations on Each Band: 120M, 90M, 75M, 60M, 49M, 41M, 31M, 25M, 22M, 19M, 16M, 13M, and 11M. * Record your S-Meter readings for these Stations and Time of Day/Night. * De-Tune by 5-15 kHz to a 'dead-spot' on the band and also record your Background Noise Level for the Band near each of these Stations. iane ~ RHF .. .. = = = "JEFF UK" = = = wrote in message ... No. I just know 20 mtrs is very noisy here. Now its much better on a signal to noise ratio. Every thing appears to be the same signal strengh on know frequencies. Cheers Jeff "RHF" wrote in message m... JEFF-UK, QUESTION - Prior to 'making' your Changes did you do any Reception Testing and Record your Results ? FWIW - Our Memories are "Poor-Recorders-of-the-Facts: When it comes to all the 'factors' that make-up the Ojective Evidence and Subjective Judgements like a Radio Broadcaster's Signal Strength and the Background Noise Level {Signal-to-Noise Ratio} of a Shortwave Band. * Now multiply this by five to ten Broadcasters per SW Band. * Then multiply this by five to ten SW Bands. You now have 50 to 200 Observations to Memorize or Record. I 'favor' the "Write-It-Down" Method. Read Message # 556 Your ANTENNAS Journal-Ledger and Understanding the Shortwave Bands http://groups.yahoo.com/group/SWL-AM...na/message/556 Read Message # 88 Hooking-Up a "Balun" [Matching Transformer] to a Random Wire Antenna http://groups.yahoo.com/group/SWL-AM...nna/message/88 More Balun (Matching Transfromer Reading: * MLB Theory http://groups.yahoo.com/group/SWL-AM...na/message/340 * Magnetic Longwire Balun (MLB) - Help ! http://groups.yahoo.com/group/SWL-AM...na/message/173 * Magnetic Longwire Balun (MLB) - Build Your Own "DIY" http://groups.yahoo.com/group/SWL-AM...na/message/177 * Balun / Matching Transformer Reading List ( Long 43 Links ) http://groups.yahoo.com/group/SWL-AM...na/message/337 iane ~ RHF . Some Say: On A Clear Day You Can See Forever. http://groups.yahoo.com/group/SWL-AM...na/message/502 I BELIEVE: On A Clear Night... You Can Hear Forever and Beyond ! . . = = = "JEFF UK" = = = wrote in message ... Hi. Further to my last post............ This weekend i messed about with my long wire receiving ( only ) antenna. ( Length 20Mtrs, coax fed , earthed 10 mtrs from house). Yesterday i built a 9:1 balun / transformer. Placed it at my earth rod out side. I am not even sure if this is the right one for a long wire ? Anyway.. reception on 20 mtrs now has much less noise now. The signal to noise ratio has vastly improved. Reception on other bands remains about the same as before i added the balun. (I used my Wellbrook loop antenna to compare signals.) My question now is... How do improve reception/noise on other bands ? Do i need a different balun or change the length of my wire ? What ever i have done seems to of peaked on 20mts ( 14Mhz). It would be great to get rid of the noise on 80mtrs for example. Any ideas or diagrams appreciated. Interesting stuff this ! Regards Jeff . |
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#5
January 27th 04, 09:50 PM
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will do
Jeff "RHF" wrote in message m... JEFF-UK, WHAT TO DO: Select from three to five strong International Broadcast Stations on Each Band: 120M, 90M, 75M, 60M, 49M, 41M, 31M, 25M, 22M, 19M, 16M, 13M, and 11M. * Record your S-Meter readings for these Stations and Time of Day/Night. * De-Tune by 5-15 kHz to a 'dead-spot' on the band and also record your Background Noise Level for the Band near each of these Stations. iane ~ RHF . . = = = "JEFF UK" = = = wrote in message ... No. I just know 20 mtrs is very noisy here. Now its much better on a signal to noise ratio. Every thing appears to be the same signal strengh on know frequencies. Cheers Jeff "RHF" wrote in message m... JEFF-UK, QUESTION - Prior to 'making' your Changes did you do any Reception Testing and Record your Results ? FWIW - Our Memories are "Poor-Recorders-of-the-Facts: When it comes to all the 'factors' that make-up the Ojective Evidence and Subjective Judgements like a Radio Broadcaster's Signal Strength and the Background Noise Level {Signal-to-Noise Ratio} of a Shortwave Band. * Now multiply this by five to ten Broadcasters per SW Band. * Then multiply this by five to ten SW Bands. You now have 50 to 200 Observations to Memorize or Record. I 'favor' the "Write-It-Down" Method. Read Message # 556 Your ANTENNAS Journal-Ledger and Understanding the Shortwave Bands http://groups.yahoo.com/group/SWL-AM...na/message/556 Read Message # 88 Hooking-Up a "Balun" [Matching Transformer] to a Random Wire Antenna http://groups.yahoo.com/group/SWL-AM...nna/message/88 More Balun (Matching Transfromer Reading: * MLB Theory http://groups.yahoo.com/group/SWL-AM...na/message/340 * Magnetic Longwire Balun (MLB) - Help ! http://groups.yahoo.com/group/SWL-AM...na/message/173 * Magnetic Longwire Balun (MLB) - Build Your Own "DIY" http://groups.yahoo.com/group/SWL-AM...na/message/177 * Balun / Matching Transformer Reading List ( Long 43 Links ) http://groups.yahoo.com/group/SWL-AM...na/message/337 iane ~ RHF . Some Say: On A Clear Day You Can See Forever. http://groups.yahoo.com/group/SWL-AM...na/message/502 I BELIEVE: On A Clear Night... You Can Hear Forever and Beyond ! . . = = = "JEFF UK" = = = wrote in message ... Hi. Further to my last post............ This weekend i messed about with my long wire receiving ( only ) antenna. ( Length 20Mtrs, coax fed , earthed 10 mtrs from house). Yesterday i built a 9:1 balun / transformer. Placed it at my earth rod out side. I am not even sure if this is the right one for a long wire ? Anyway.. reception on 20 mtrs now has much less noise now. The signal to noise ratio has vastly improved. Reception on other bands remains about the same as before i added the balun. (I used my Wellbrook loop antenna to compare signals.) My question now is... How do improve reception/noise on other bands ? Do i need a different balun or change the length of my wire ? What ever i have done seems to of peaked on 20mts ( 14Mhz). It would be great to get rid of the noise on 80mtrs for example. Any ideas or diagrams appreciated. Interesting stuff this ! Regards Jeff . |
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