Home |
Search |
Today's Posts |
#1
|
|||
|
|||
AM Radio Question
I'm hoping someone can shed some light on why my AM radio doesn't come
in as clearly as my stock car radio. I am a KGO talk radio fan and live in the bay area. I also have a home in the gold country that I visit almost every weekend. I noticed that KGO didn't come in at all on my regular, small radio so I invested in a CC Radio Plus with a ferrite antenna. Much to my dismay it comes in very distorted, although KNBR comes in very clearly. What I don't understand is why my stock car radio tunes in KGO perfectly. I'm wondering if it's because my CC Radio is inside and my car is outside? Also, does anyone have any suggestions as to how I can get better reception? Any help would be greatly appreciated! |
#2
|
|||
|
|||
ldbk wrote: I'm hoping someone can shed some light on why my AM radio doesn't come in as clearly as my stock car radio. I am a KGO talk radio fan and live in the bay area. I also have a home in the gold country that I visit almost every weekend. I noticed that KGO didn't come in at all on my regular, small radio so I invested in a CC Radio Plus with a ferrite antenna. Much to my dismay it comes in very distorted, although KNBR comes in very clearly. What I don't understand is why my stock car radio tunes in KGO perfectly. I'm wondering if it's because my CC Radio is inside and my car is outside? Also, does anyone have any suggestions as to how I can get better reception? Any help would be greatly appreciated! The am mw antenna on that radio is a ferrite bar antenna on the inside of the rear of that receiver. Try turning the radio until the reception is best. usually broadside to the antenna. Les Locklear Monitoring since ' 57 Located on the Gulf of Mexico Bendix R-1015B/URR Hammarlund R-274C/FRR (SP-600JX-14) Ten Tec RX-340 RF Systems MLB - MK2 Quantum QX Loop CU-2279/BRC Multicoupler http://www.hammarlund.info/homepage.html |
#3
|
|||
|
|||
On 2 May 2005 16:37:43 -0700, "ldbk" wrote:
I'm hoping someone can shed some light on why my AM radio doesn't come in as clearly as my stock car radio. I am a KGO talk radio fan and live in the bay area. I also have a home in the gold country that I visit almost every weekend. I noticed that KGO didn't come in at all on my regular, small radio so I invested in a CC Radio Plus with a ferrite antenna. Much to my dismay it comes in very distorted, although KNBR comes in very clearly. What I don't understand is why my stock car radio tunes in KGO perfectly. I'm wondering if it's because my CC Radio is inside and my car is outside? Also, does anyone have any suggestions as to how I can get better reception? Any help would be greatly appreciated! http://www.ccrane.com/am-antennas.aspx |
#4
|
|||
|
|||
KGO uses a directional antenna. AM directional anntennas work by generating
interfering or re-inforcing waves in various directions. KGO's system favors the north-south directions and disfavors east-west transmission. Your gold country home is in a "null" direction from the KGO transmitter (at the eastern end of the Dumbarton bridge). In such areas, the phase interference produced by the transmitting antenna causes distortion in receivers. KNBR has a non-directional antenna which is not subject to these effects. The only way to improve your reception of KGO is to move. As for your auto reception, the phase interference is a factor of postion. If you drive around while listening to KGO you will find the area of distortion is in a line between you and the KGO transmitter. BTW, how is your reception of KCBS? Its situation is similar to KGO's Norm Lehfeldt "ldbk" wrotf: I'm hoping someone can shed some light on why my AM radio doesn't come in as clearly as my stock car radio. I am a KGO talk radio fan and live in the bay area. I also have a home in the gold country that I visit almost every weekend. I noticed that KGO didn't come in at all on my regular, small radio so I invested in a CC Radio Plus with a ferrite antenna. Much to my dismay it comes in very distorted, although KNBR comes in very clearly. What I don't understand is why my stock car radio tunes in KGO perfectly. I'm wondering if it's because my CC Radio is inside and my car is outside? Also, does anyone have any suggestions as to how I can get better reception? Any help would be greatly appreciated! |
#5
|
|||
|
|||
norml wrote: KGO uses a directional antenna. AM directional anntennas work by generating interfering or re-inforcing waves in various directions. KGO's system favors the north-south directions and disfavors east-west transmission. Your gold country home is in a "null" direction from the KGO transmitter (at the eastern end of the Dumbarton bridge). In such areas, the phase interference produced by the transmitting antenna causes distortion in receivers. KNBR has a non-directional antenna which is not subject to these effects. The only way to improve your reception of KGO is to move. As for your auto reception, the phase interference is a factor of postion. If you drive around while listening to KGO you will find the area of distortion is in a line between you and the KGO transmitter. BTW, how is your reception of KCBS? Its situation is similar to KGO's Norm Lehfeldt Thanks for such a clear response! KCBS comes in strong and is very clear as well. That's really strange since KGO is practically non-existent. I was going through talk radio withdrawal. The only really clear talk radio was out of Utah or KSFO. Neither were stations I like to listen to. Maybe I should think about listening via the internet. |
#6
|
|||
|
|||
"norml" wrote
KGO's system favors the north-south directions and disfavors east-west transmission. Your gold country home is in a "null" direction from the KGO transmitter (at the eastern end of the Dumbarton bridge). In such areas, the phase interference produced by the transmitting antenna causes distortion in receivers. _________________ Distortion of this nature usually occurs only very close to the transmit site (a mile or so). Note that if KGO was transmitting distortion toward ldbk's gold country site, she also would hear it there on her stock car radio. But she says her car radio "tunes in KGO perfectly." While KGO radiates less power toward the gold country than KNBR, the signal strengths of each are defined more by groundwave losses than by their radiated power. For example, the 2.5 mV/m groundwave field strength contour for KNBR passes about 60 miles beyond Sacramento, while for KGO it is about 20 miles beyond Sacramento -- and this includes the differences in their radiation patterns. Probably the reception that ldbk notes is based more on the sensitivities of the radios, and the locations where they are used. Radios used inside a building have less signal to work with because the wiring in the building can act as a shield. Aluminum siding just about kills AM reception except in very strong signal areas. Also there could be a lot of interference in the building (light dimmers, touch lamps etc). Rotating/moving the CC radio around the building may help reduce noise by capturing more signal and/or rejecting some of the local noise sources. RF (retired broadcast engineer) |
#7
|
|||
|
|||
LDBK,
|
#8
|
|||
|
|||
"LauraM" wrote in message ups.com... Thanks for such a clear response! KCBS comes in strong and is very clear as well. That's really strange since KGO is practically non-existent. So, does KGO get bad reception in your car when it is parked in the driveway? If so, I guess that would clinch it. |
#9
|
|||
|
|||
David,
|
#10
|
|||
|
|||
I don't know about the KCBS pattern, but from experience it always
sounds better east of the bay area than KGO. This is especially true in central Nevada, which is due east of the bay area. You can hear KCBS better than KGO in Yosemite as well. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|