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#2
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Dave wrote:
Wow. Thank you for these concise and clear directions. One thing though, I really don't *think* I am overloading the set. Only problem I have is digging the weak (but desired) signals our of the background noise surrounding them. In another post I mentioned Voice of Korea's Central and South American broadcast as the point of interest. It is just at the same level as the background noise that doesn't interfere with other broadcasts like the BBC on 5975 kHz or Radio Havana, Cuba on 9820 kHz (or Radio China International, originally from Taiwan and rebroadcast through some place in Florida, which frequency I can't remember at the moment.) It is only the weak signals I am having trouble with. If I tune into WWV our of Ft. Collins CO I can barely make out some out-of-band signals coming in, but they are so weak as to be vanishing. Does this still sound like overloading? Because the troublesom signals are also very weak, I am thinking that a preselector will probably take care of my problems. (I am still tempted to abandon my random wire and install your suggested antenna just because it sounds so much more sophisticated. Will let you know.) Thanks for the feedback. Dave If you don't hear that background noise with the whip antenna, the problem is almost certainly too much signal (overloading) from the external antenna. That's why I recommended a passive preselector. -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
#3
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"starman" wrote in message ... Dave wrote: Wow. Thank you for these concise and clear directions. One thing though, I really don't *think* I am overloading the set. Only problem I have is digging the weak (but desired) signals our of the background noise surrounding them. In another post I mentioned Voice of Korea's Central and South American broadcast as the point of interest. It is just at the same level as the background noise that doesn't interfere with other broadcasts like the BBC on 5975 kHz or Radio Havana, Cuba on 9820 kHz (or Radio China International, originally from Taiwan and rebroadcast through some place in Florida, which frequency I can't remember at the moment.) It is only the weak signals I am having trouble with. If I tune into WWV our of Ft. Collins CO I can barely make out some out-of-band signals coming in, but they are so weak as to be vanishing. Does this still sound like overloading? Because the troublesom signals are also very weak, I am thinking that a preselector will probably take care of my problems. (I am still tempted to abandon my random wire and install your suggested antenna just because it sounds so much more sophisticated. Will let you know.) Thanks for the feedback. Dave If you don't hear that background noise with the whip antenna, the problem is almost certainly too much signal (overloading) from the external antenna. That's why I recommended a passive preselector. Okay, that I can understand. If I leave the radio switched to DX while listening to BBC etc, the background noise is still there, but like the desired signal is at least twice the strength it would be with the whip alone. Therefore I switch to Local, which blanks out the noise. WithVOK to Central and South America I can't do that without losing the desired broadcast as well. Will a preselector still help (at least somewhat?) or is this just the way it is? Thanks, Dave |
#4
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Dave wrote:
"starman" wrote in message If you don't hear that background noise with the whip antenna, the problem is almost certainly too much signal (overloading) from the external antenna. That's why I recommended a passive preselector. Okay, that I can understand. If I leave the radio switched to DX while listening to BBC etc, the background noise is still there, but like the desired signal is at least twice the strength it would be with the whip alone. Therefore I switch to Local, which blanks out the noise. WithVOK to Central and South America I can't do that without losing the desired broadcast as well. Will a preselector still help (at least somewhat?) or is this just the way it is? Thanks, Dave Your describing (above) the classic symptom of overloading. Make the noise comparison using just the receiver's whip antenna first, then connect the external antenna. You can leave it set to DX for both antennas. If you hear the noise *only* when using the external antenna, the problem is overloading. The noise you're hearing is coming from many intermodulation products caused by insufficient dynamic range when using an external antenna. A passive preselector will allow you to use the external antenna without the noise. -----= Posted via Newsfeeds.Com, Uncensored Usenet News =----- http://www.newsfeeds.com - The #1 Newsgroup Service in the World! -----== Over 100,000 Newsgroups - 19 Different Servers! =----- |
#5
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"starman" wrote in message ... Dave wrote: "starman" wrote in message If you don't hear that background noise with the whip antenna, the problem is almost certainly too much signal (overloading) from the external antenna. That's why I recommended a passive preselector. Okay, that I can understand. If I leave the radio switched to DX while listening to BBC etc, the background noise is still there, but like the desired signal is at least twice the strength it would be with the whip alone. Therefore I switch to Local, which blanks out the noise. WithVOK to Central and South America I can't do that without losing the desired broadcast as well. Will a preselector still help (at least somewhat?) or is this just the way it is? Thanks, Dave Your describing (above) the classic symptom of overloading. Make the noise comparison using just the receiver's whip antenna first, then connect the external antenna. You can leave it set to DX for both antennas. If you hear the noise *only* when using the external antenna, the problem is overloading. The noise you're hearing is coming from many intermodulation products caused by insufficient dynamic range when using an external antenna. A passive preselector will allow you to use the external antenna without the noise. Hello Starman, Sorry I forgot to respond to you earlier. I did this a while back, when you or someone else first suggested it, and I hear hte same background noise with the whip that I hear with the external antenna, it (along with the other signals, inaudable with the whip alone) is just louder with the external. That is why I am wanting to use the passive preselector. I am thinking that will reduce the noise without reducing the desired signal. Dave |
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