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#1
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On 1/16/2011 5:07 PM, bpnjensen wrote:
... Short answer - I am getting desperate over the noise level here. Grasping at straws. The fellow I spoke to who makes these things said they are best used as close to the receiver input as possible. You will certainly need to locate the noise source and place the antenna as far away as possible and orientate the antenna so the direction favored by the particular antenna is pointed AWAY form the noise source. You will probably want to use a 9:1 balun and use coax for the run past any noise source and to provide isolation from noise sources in the home. A GOOD GROUND on the receiver will serve you well. If possible, would also be good to ground the coax braid at the antenna, or run a wire down to ground as short as possible ... Regards, JS |
#2
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On Jan 16, 6:09*pm, John Smith wrote:
On 1/16/2011 5:07 PM, bpnjensen wrote: ... Short answer - I am getting desperate over the noise level here. Grasping at straws. The fellow I spoke to who makes these things said they are best used as close to the receiver input as possible. You will certainly need to locate the noise source and place the antenna as far away as possible and orientate the antenna so the direction favored by the particular antenna is pointed AWAY form the noise source. * You will probably want to use a 9:1 balun and use coax for the run past any noise source and to provide isolation from noise sources in the home. *A GOOD GROUND on the receiver will serve you well. *If possible, would also be good to ground the coax braid at the antenna, or run a wire down to ground as short as possible ... Regards, JS John, thanks - but my whole neighborhood is a noise source. That's no joke. Otherwise, I know all of this already, and have already built it to the best possible configuration, much as you've described here. |
#3
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On Jan 16, 10:13*pm, bpnjensen wrote:
On Jan 16, 6:09*pm, John Smith wrote: On 1/16/2011 5:07 PM, bpnjensen wrote: ... Short answer - I am getting desperate over the noise level here. Grasping at straws. The fellow I spoke to who makes these things said they are best used as close to the receiver input as possible. You will certainly need to locate the noise source and place the antenna as far away as possible and orientate the antenna so the direction favored by the particular antenna is pointed AWAY form the noise source.. * You will probably want to use a 9:1 balun and use coax for the run past any noise source and to provide isolation from noise sources in the home. *A GOOD GROUND on the receiver will serve you well. *If possible, would also be good to ground the coax braid at the antenna, or run a wire down to ground as short as possible ... Regards, JS John, thanks - but my whole neighborhood is a noise source. *That's no joke. *Otherwise, I know all of this already, and have already built it to the best possible configuration, much as you've described here.- Hide quoted text - - Show quoted text - Have you attempted to see if it is coming from the ac 120v outlets? Quite often THAT is one the biggest source of noise . What receiver(s) /antenna(s) are you using ? |
#4
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On Jan 16, 8:27*pm, wrote:
On Jan 16, 10:13*pm, bpnjensen wrote: On Jan 16, 6:09*pm, John Smith wrote: On 1/16/2011 5:07 PM, bpnjensen wrote: ... Short answer - I am getting desperate over the noise level here. Grasping at straws. The fellow I spoke to who makes these things said they are best used as close to the receiver input as possible. You will certainly need to locate the noise source and place the antenna as far away as possible and orientate the antenna so the direction favored by the particular antenna is pointed AWAY form the noise source. * You will probably want to use a 9:1 balun and use coax for the run past any noise source and to provide isolation from noise sources in the home. *A GOOD GROUND on the receiver will serve you well. *If possible, would also be good to ground the coax braid at the antenna, or run a wire down to ground as short as possible ... Regards, JS John, thanks - but my whole neighborhood is a noise source. *That's no joke. *Otherwise, I know all of this already, and have already built it to the best possible configuration, much as you've described here.- Hide quoted text - - Show quoted text - Have you attempted to see if it is coming from the ac 120v outlets? Quite often THAT is one the biggest source of noise . *What receiver(s) /antenna(s) are you using ? Actually, I know that my outlets/switch boxes are sources of buzzing RF noise. When I bring an AM radio, especially one with a tunable loop on it, toward the switches and outlets, the buzzing becomes more audible. I believe that the house is miswired so that ground and one hot side may be on the same path (this needs to be fixed). I do have an RF-born noise filter that I run the 115 VAC through. I do not get any serious amount of noise from this source (as far as I can tell) on the radio. The radio I use primarily is an Icom R75 (also an Allied SX-190 and Realistic DX-160). Two external antennas - the random wire with 9:1 match, and a DX-Ultra (essentially an all- band dipole, but pretty worthyless on the tropical bands). The worst noise, by far, is on the lower bands (7 MHz and down). At 15 MHz and above, the noise is typically minimal and reception is quite good. The tropical bands are a mess, with an S-7/S-9 noise level most of the time. I can clean up some of it with my MFJ-1026, but not all. |
#5
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On 1/16/2011 9:41 PM, bpnjensen wrote:
... Do you have above ground power in your area? Is it possible you are in an area where a "ground loop" is occurring? How often are the poles grounded? I have seen every pole grounded and some installations where only 1 out of five poles are grounded ... this can result in noise ... indeed, tremendous currents can circulate though the ground ... Regards, JS |
#6
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On Jan 17, 12:56*am, John Smith wrote:
On 1/16/2011 9:41 PM, bpnjensen wrote: * ... Do you have above ground power in your area? Is it possible you are in an area where a "ground loop" is occurring? How often are the poles grounded? *I have seen every pole grounded and some installations where only 1 out of five poles are grounded ... this can result in noise ... indeed, tremendous currents can circulate though the ground ... Regards, JS That could be a really atrocious scenario, indeed. |
#7
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On Jan 16, 9:56*pm, John Smith wrote:
On 1/16/2011 9:41 PM, bpnjensen wrote: * ... Do you have above ground power in your area? Is it possible you are in an area where a "ground loop" is occurring? How often are the poles grounded? *I have seen every pole grounded and some installations where only 1 out of five poles are grounded ... this can result in noise ... indeed, tremendous currents can circulate though the ground ... Regards, JS Good question. I would not be a bit surprised. We have 1950's era aerial power. |
#8
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On Jan 17, 12:41*am, bpnjensen wrote:
On Jan 16, 8:27*pm, wrote: On Jan 16, 10:13*pm, bpnjensen wrote: On Jan 16, 6:09*pm, John Smith wrote: On 1/16/2011 5:07 PM, bpnjensen wrote: ... Short answer - I am getting desperate over the noise level here. Grasping at straws. The fellow I spoke to who makes these things said they are best used as close to the receiver input as possible. You will certainly need to locate the noise source and place the antenna as far away as possible and orientate the antenna so the direction favored by the particular antenna is pointed AWAY form the noise source. * You will probably want to use a 9:1 balun and use coax for the run past any noise source and to provide isolation from noise sources in the home. *A GOOD GROUND on the receiver will serve you well. *If possible, would also be good to ground the coax braid at the antenna, or run a wire down to ground as short as possible ... Regards, JS John, thanks - but my whole neighborhood is a noise source. *That's no joke. *Otherwise, I know all of this already, and have already built it to the best possible configuration, much as you've described here.- Hide quoted text - - Show quoted text - Have you attempted to see if it is coming from the ac 120v outlets? Quite often THAT is one the biggest source of noise . *What receiver(s) /antenna(s) are you using ? Actually, I know that my outlets/switch boxes are sources of buzzing RF *noise. *When *I bring an AM radio, especially one with a tunable loop on it, toward the switches and outlets, the buzzing becomes more audible. *I believe that the house is miswired so that ground and one hot side may be on the same path (this needs to be fixed). I do have an RF-born noise filter that I run the 115 VAC through. *I do not get any serious amount of noise from this source (as far as I can tell) on the radio. *The radio I use primarily is an Icom R75 (also an Allied SX-190 and Realistic DX-160). *Two external antennas - the random wire with 9:1 match, and a DX-Ultra (essentially an all- band dipole, but pretty worthyless on the tropical bands). *The worst noise, by far, is on the lower bands (7 MHz and down). *At 15 MHz and above, the noise is typically minimal and reception is quite good. The tropical bands are a mess, with an S-7/S-9 noise level most of the time. *I can clean up some of it with my MFJ-1026, but not all.- Hide quoted text - - Show quoted text - Have you tried using a 12v battery as a power source ? This may clear things up. |
#9
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On Jan 16, 10:05*pm, wrote:
On Jan 17, 12:41*am, bpnjensen wrote: On Jan 16, 8:27*pm, wrote: On Jan 16, 10:13*pm, bpnjensen wrote: On Jan 16, 6:09*pm, John Smith wrote: On 1/16/2011 5:07 PM, bpnjensen wrote: ... Short answer - I am getting desperate over the noise level here.. Grasping at straws. The fellow I spoke to who makes these things said they are best used as close to the receiver input as possible. You will certainly need to locate the noise source and place the antenna as far away as possible and orientate the antenna so the direction favored by the particular antenna is pointed AWAY form the noise source. * You will probably want to use a 9:1 balun and use coax for the run past any noise source and to provide isolation from noise sources in the home. *A GOOD GROUND on the receiver will serve you well. *If possible, would also be good to ground the coax braid at the antenna, or run a wire down to ground as short as possible ... Regards, JS John, thanks - but my whole neighborhood is a noise source. *That's no joke. *Otherwise, I know all of this already, and have already built it to the best possible configuration, much as you've described here.- Hide quoted text - - Show quoted text - Have you attempted to see if it is coming from the ac 120v outlets? Quite often THAT is one the biggest source of noise . *What receiver(s) /antenna(s) are you using ? Actually, I know that my outlets/switch boxes are sources of buzzing RF *noise. *When *I bring an AM radio, especially one with a tunable loop on it, toward the switches and outlets, the buzzing becomes more audible. *I believe that the house is miswired so that ground and one hot side may be on the same path (this needs to be fixed). I do have an RF-born noise filter that I run the 115 VAC through. *I do not get any serious amount of noise from this source (as far as I can tell) on the radio. *The radio I use primarily is an Icom R75 (also an Allied SX-190 and Realistic DX-160). *Two external antennas - the random wire with 9:1 match, and a DX-Ultra (essentially an all- band dipole, but pretty worthyless on the tropical bands). *The worst noise, by far, is on the lower bands (7 MHz and down). *At 15 MHz and above, the noise is typically minimal and reception is quite good. The tropical bands are a mess, with an S-7/S-9 noise level most of the time. *I can clean up some of it with my MFJ-1026, but not all.- Hide quoted text - - Show quoted text - Have you tried using a 12v battery as a power source ? This may clear things up. Not yet, and as RHF also suggested. Maybe worth a try. |
#10
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On Jan 16, 9:41*pm, bpnjensen wrote:
On Jan 16, 8:27*pm, wrote: On Jan 16, 10:13*pm, bpnjensen wrote: On Jan 16, 6:09*pm, John Smith wrote: On 1/16/2011 5:07 PM, bpnjensen wrote: ... Short answer - I am getting desperate over the noise level here. Grasping at straws. The fellow I spoke to who makes these things said they are best used as close to the receiver input as possible. You will certainly need to locate the noise source and place the antenna as far away as possible and orientate the antenna so the direction favored by the particular antenna is pointed AWAY form the noise source. * You will probably want to use a 9:1 balun and use coax for the run past any noise source and to provide isolation from noise sources in the home. *A GOOD GROUND on the receiver will serve you well. *If possible, would also be good to ground the coax braid at the antenna, or run a wire down to ground as short as possible ... Regards, JS John, thanks - but my whole neighborhood is a noise source. *That's no joke. *Otherwise, I know all of this already, and have already built it to the best possible configuration, much as you've described here.- Hide quoted text - - Show quoted text - Have you attempted to see if it is coming from the ac 120v outlets? Quite often THAT is one the biggest source of noise . *What receiver(s) /antenna(s) are you using ? - Actually, I know that my outlets/switch boxes are sources of buzzing - RF *noise. *When *I bring an AM radio, especially one with a tunable - loop on it, toward the switches and outlets, the buzzing becomes more - audible. *I believe that the house is miswired so that ground and one - hot side may be on the same path (this needs to be fixed). BpnJ -First- Buy a simple to use AC Outlet/Receptacle Tester http://en.wikipedia.org/wiki/Receptacle_tester for 3-Wire Outlets : Has 3-Lights to Show Proper & Improper Wiring of each and every Outlet that you Test in the House : Do them One-at-aTime & One Room at a Time : One Room per Day by the End of Two Weeks 14-Days you should be Done. * AC Outlet/Receptacle Tester http://www.amazon.com/dp/B002LZTKIA * AC Outlet/Receptacle Tester http://www.tripplite.com/en/products...xtModelID=3941 * AC Outlet/Receptacle Tester http://www.acehardware.com/product/i...ductId=3099774 BpnJ -Second- Next Question : Do You Have 110/120 Volts AC ? * How to Test for AC Outlet Voltage http://www.ehow.com/how_2072916_test-ac-voltage.html * How To Test AC Outlet Voltage http://www.acmehowto.com/howto/homem...letvoltage.php * 120 Volts? Usually but not always... http://www.rocketroberts.com/techart/power.htm -TIP- The Outlet/Receptacle could be Wired Right -but- You could have Bad Wiring to the Outlet and a Voltage Drop down to 85~105 Volts Another way of doing this is with a Power Strip http://en.wikipedia.org/wiki/Power_strip * 6-Outlet Power Strip with 4 Foot Cord http://www.amazon.com/dp/B00006L4F1 Plug two (2) 100 Watt Incandescent Light Bulbs in to it using two (2) of these Plug-In Light Socket Outlet Adapters http://www.amazon.com/dp/B000VL4CFC Now you can Check the Voltage at the Outlet with a 2 Amp Load on it to see if there are any High Resistance Connections causing a Voltage Drop. BpnJ -Third- LAST : Once all this is Tested and Fixed : You only have one thing left : Your Service Entrance Ground. For this Test and Repair you should Call a Licensed Electrician to do the Work. http://www.cdc.gov/nceh/publications...gure_cha11.htm -Safety- If the Electrical Service Entrance Ground is not *R*I*G*H*T* :Then potentially the whole Electrical System of the House is Unsafe. -Conclusion- Once this is all done : You will have the Knowledge and the Confidence in Knowing that your House's Electrical System is Wired Correctly and Properly Grounded. -in-a-word-'safe'- ![]() The First Rule of Shortwave Radio Listeners [SWLs] using Outside SWL Antennas is "SAFETY" [.] hope this helps - iane ~ RHF |
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