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Post by jimhenry2000 on May 25, 2017 0:15:07 GMT
My 5000 is again up and running and the 150' coax run between transmitter and 102" whip has been eliminated. The transmitter is now out at the antenna site and it is basically ground mounted though up on a BIG hill. Due to not finding a practical way to mount the whip antenna I went back to a 118" wire antenna. I had big hopes for increased range but it's not increased and possibly somewhat decreased. I am wondering if there is any electrical difference between three antennas?
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Post by Deleted on May 25, 2017 0:40:25 GMT
What Little I Know
Not having done actual side-by-side comparisons between antenna types I have an expectation based entirely on reading about it in these forums over the years.
The length of the antenna seems to have more to do with range than the metal or relative thickness of that metal.
Many have claimed that the thickness contributes to a wider bandwidth in the audio frequency spectrum, but I have not observed a bandwidth limitation in a wire antenna....
The bandwidth is the 5 to 10 kHz frequency response of an AM transmission.
Using a copper pipe, regardless of its diameter, apparently the RF energy does not saturate more of that metal but rides on the outer surface of the pipe owing to the so-called "skin-effect".
The stiffer the antenna the less it will move or shimmer in the wind, and that might make a copper pipe the most stable form of antenna if it is staunchly held in position. Even with that, if your fiber-glass tower structure moves in the wind the issue is moot.
Moving in the wind might cause reception to increase-decrease slightly at the radio.
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Post by mark on May 25, 2017 2:14:50 GMT
Don't know much about the technical side of things with AM as I do FM in Canada but from what I have read in these forms the wetter the ground the better and also the deeper you get the metal stake helps too but since you are on a "big" hill, at the higher elevation there is less moisture in the earth than a lower lying area and not as good conductivity.
Mark
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Post by Deleted on May 25, 2017 2:34:28 GMT
Amazing How We Overlook the Obvious
Mark mentions something that seems obvious after he says it: "At the higher elevation there is less moisture in the earth than a lower lying area and not as good conductivity."
I wish I'd thought of that. Right.
What clouded my mind is the notion that having the antenna on the highest part of a hill is a good thing, but what about the fact that moisture follows gravity and heads downhill?
Ground moisture is a huge boost to ground conductivity as I learned when operating a carrier current station using the neutral injection method of transmission... totally dependent upon ground rods and earth conduction.
During a prolonged dry spell my signal became very weak on the outskirts, but when it rained heavily the station went out like a tsunami and covered a large area.
Doing the most with a very low power radio signal is a huge challenge in the dynamic realm of nature.
These antenna discussions are proudly sponsored by national flag suppliers. Flags for your country or theirs, in wonderful full color. Hang them on poles and let them flap.
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Post by station8 on May 25, 2017 13:27:46 GMT
Howdy All: I can help you out with this,but need to meet me on team speak and you will need pencil and paper.
I can say this do to actual test ive done on 30 different antennas with several various am tx.
So pick your date and time ( eastern ) OK.
It would be to much for me to type what I know on here.
Carl a good show for you.
And everyone welcome to the show to ask questions and have them ready.
Station 8
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Post by Deleted on May 25, 2017 16:40:29 GMT
Watch This Thread
Hi Jeff... sounds like a good opportunity and there was already the possibility of maybe doing a TeamSpeak Show sometime this weekend... no time has been set.
Thinking about Saturday afternoon... it's Thursday now unless I have the wrong calendar.
As we get closer a notice will be posted right here and the fun will get off to a start.
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Post by station8 on May 25, 2017 17:18:16 GMT
Howdy All: Sounds good Carl I'll check back to see time.
Jim try to make it OK
Station 8
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Post by Deleted on May 25, 2017 18:19:58 GMT
The Best of All Worlds
Program time officially announced: On Saturday, May 27, 11 AM EDT, the TeamSpeak Open Room will come alive as Jeff Station8 and Carl Blare conduct a special edition of Blare OnAir around the topic of antenna technology for part 15 AM radio, in response to questions raised in this thread.
Other persons are welcome to log on and join the conversation, but also have the option of listening later, keeping in mind that the program will be linked for download.
Membership in the ALPB is not necessary, and by simply using the contact info on the ALPB Home Page you will be instructed how to enter TeamSpeak for the show.
Saturday morning at 11 AM EDT KDX will be broadcasting Donitzetti's opera "Lucia di Lammermoor" and Carl does not need to hear it as he heard it once many years ago.
Blare OnAir is brought to you by paper roll holders. If it weren't for paper roll holders, rolls of paper would be rolling all over the place.
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Post by jimhenry2000 on May 26, 2017 0:29:34 GMT
I'll do my best to make it. Howdy All: Sounds good Carl I'll check back to see time. Jim try to make it OK Station 8
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Post by jimhenry2000 on May 27, 2017 15:10:59 GMT
Sorry I didn't make it until 11:06 and no one was on. The Best of All WorldsProgram time officially announced: On Saturday, May 27, 11 AM EDT, the TeamSpeak Open Room will come alive as Jeff Station8 and Carl Blare conduct a special edition of Blare OnAir around the topic of antenna technology for part 15 AM radio, in response to questions raised in this thread. Other persons are welcome to log on and join the conversation, but also have the option of listening later, keeping in mind that the program will be linked for download. Membership in the ALPB is not necessary, and by simply using the contact info on the ALPB Home Page you will be instructed how to enter TeamSpeak for the show. Saturday morning at 11 AM EDT KDX will be broadcasting Donitzetti's opera "Lucia di Lammermoor" and Carl does not need to hear it as he heard it once many years ago. Blare OnAir is brought to you by paper roll holders. If it weren't for paper roll holders, rolls of paper would be rolling all over the place.
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Post by station8 on May 27, 2017 15:11:29 GMT
Howdy You All:
Just so you know may 27, 2017 at 11:00 am est show has been cancelled.
Carl was having audio issue OK.
We will set up a new date and time for everyone OK .
So put your date and time inputs for the new show in please.
Station 8
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Post by cthuskyman on May 27, 2017 15:28:15 GMT
Howdy You All: Just so you know may 27, 2017 at 11:00 am est show has been cancelled. Carl was having audio issue OK. We will set up a new date and time for everyone OK . So put your date and time inputs for the new show in please. Station 8 Ah crap. I guess that's why the room's empty, LOL.
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Post by Deleted on May 27, 2017 16:42:41 GMT
Double Threads
Thanks to Jeff Station8 for alerting you to the audio trouble experienced here at KDX.
This past week the Control Desk was moved and some equipment re-installed, something is not right and my microphone channel is HUM.
Very serious weather coming this afternoon.
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Post by Deleted on May 28, 2017 16:22:21 GMT
KDX Floating Around Without Engines
We just used a fine-toothed comb to inspect our audio system and found the XLR cable connecting our Alpmic to the mixer had developed a defect, possibly due to the age of the cable dating back to the late 1960s.
Jeff Station8, the best thing for you to do is arrange to meet Jim Henry on TeamSpeak to talk antennas...
It will be awhile before the problem here is solved.
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Post by mighty1650 on Jun 1, 2017 17:40:01 GMT
The copper pipe would have more bandwidth. Both the whip and pipe will do better than the wire.
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