| Author |
Message |
    
Allagator
Advanced Member
Username: Allagator
Post Number: 588
Registered: 9-2002
| | Posted on Tuesday, May 03, 2005 - 12:59 am: | 
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ive been running a M104c and a homemade Gatorod !(Dipole)
but ive noticed my recive has drop a bunch !
to the point my locals just bobble my meter !
well i decided to try a test !
Anatenna is a A99
coax is belden RG-8\U
radios i was useing
RCI 2995DX
Connex 3300
Cobra 29 classic
now the test started with the A99 on top my tower ! good for 15 miles ! on all 3 radios !
test 2 with a 20 foot pushup pole !
15 foot from the tower !
still good for 15 miles !
test 3 was on a 10 foot pole on the other side of my house and i got out 20 to 25 miles with no problem !
now is this strange ???
test 3 the antenna was not grounded to the radio other than with the coax !
I think my tower is in a DEAD SPOT !
any ideas ???
Thanks ! Allagator
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Road_warrior
Advanced Member
Username: Road_warrior
Post Number: 531
Registered: 7-2004
| | Posted on Tuesday, May 03, 2005 - 12:31 pm: |
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Yes, i have about 85X25ft of property and
i have dead spots in certain directions in
this little of space. It is possible.
Only thing you can do is locate which spot
works best for your needs and relocate your
antennas and tower. Just make sure you are
correct in your testing. Or alot of work
will be done for nothing. Good Luck |
Tech291
Moderator
Username: Tech291
Post Number: 168
Registered: 11-2004
| | Posted on Tuesday, May 03, 2005 - 4:11 pm: |
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maybe the top of your tower is in a stargate or worm hole and your actually transmitting to other worlds!
tech291
CEF#291
kc8zpj |
Road_warrior
Advanced Member
Username: Road_warrior
Post Number: 532
Registered: 7-2004
| | Posted on Wednesday, May 04, 2005 - 10:15 am: |
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Tech 291 has a good point there...LOL
Hummm
JIM/ PA/ CEF 375 |
Crackerjack
Intermediate Member
Username: Crackerjack
Post Number: 410
Registered: 7-2004
| | Posted on Wednesday, May 04, 2005 - 4:08 pm: |
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What you did was change the angle of radiation and the ground plane effect. A gain in one causes a cost in the other.
Raising the antenna is costing you some ground wave radiation -where the E fields are actually using the ground to radiate (ground wave), and placing them into the air -shooting away into the distance. The lower angle caused by the tower height gets distance at the cost of some local ground wave.
Do you have a "GPK" attached? |
Crackerjack
Intermediate Member
Username: Crackerjack
Post Number: 411
Registered: 7-2004
| | Posted on Wednesday, May 04, 2005 - 4:39 pm: |
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Road Warrior:
I was waiting for my antenna to ship, so I had a 102" SS Whip up 30" on the mast. The SWR was not great but I could talk to Anchorage and Maine from San Antomio barefoot.
I could not talk local for more than 2 miles and was blind out to 70 miles.
That all changed when I mounted the Starduster. |
Bigbob
Senior Member
Username: Bigbob
Post Number: 1861
Registered: 12-2001
| | Posted on Wednesday, May 04, 2005 - 11:26 pm: |
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Check the coax connectors and the coax for water in the braid,as for signal reports it is more likely that your stick was using the tower as a reflector much like a beam,at any rate vertical metal objects in your antennas field will distort it's pattern,horizontal ones will also but more like a ground plane.A metal sided building will reflect,had a a-99 on a ten foot pole twenty feet from my trailer,got out in that direction 13 miles on am 4 watts,raised it to 30 feet lost 7 mi. on local but the skip was almost nauseatingly loud,lost the side reflection but gained the roof reflection.I like that moo-cow avatar.Bigbob |
Allagator
Advanced Member
Username: Allagator
Post Number: 597
Registered: 9-2002
| | Posted on Thursday, May 12, 2005 - 11:32 pm: |
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OK HERE I GO AGAIN !
THANKS BIGBOB ! LOL !
I have moved to of the 2 of the antennas to a tree ! and i have tried somthing i have never done before !!!!
i have a BIG kite so i thought what the heck !
dipole hooked up for part of the lead for the kite !
30 foot i lost everything !
let the sting out more ! 90 foot ! and had everything within the us i think !
pulled it from the 90 foot to 20 foot and cought it in a darn tree and worked great !
now if anyone can tell me why the 30 to 40 foot zone is dead here ????????
and still cant figure out how my Gatorod will talk better than the M104c and the A99 at 48 foot ! but i can hang a darn wire off the tree out front and run tv coax and have a 1.0 match and talk with a handheld better than i can with the base !!!!! something strange has happened !
anymore ideas i will try ! THANKS !!!
ALLAGATOR
CEF115 |
Crackerjack
Intermediate Member
Username: Crackerjack
Post Number: 472
Registered: 7-2004
| | Posted on Friday, May 13, 2005 - 1:03 am: |
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You have way too much time on your hands. Stop taking those medications. LOL |
Bigbob
Senior Member
Username: Bigbob
Post Number: 1881
Registered: 12-2001
| | Posted on Friday, May 13, 2005 - 6:47 am: |
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My solution is simple but pricy,trash everything and start over,my wife says the only dead spot I have is between my ears for coming up with such a lame answer,but you got me stumped.Bigbob |
Bigbob
Senior Member
Username: Bigbob
Post Number: 1882
Registered: 12-2001
| | Posted on Friday, May 13, 2005 - 6:51 am: |
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Addendum,add another 50 feet to your tower and forget about the problem,it's just going to drive you nuts,lol.Bigbob |
Road_warrior
Advanced Member
Username: Road_warrior
Post Number: 552
Registered: 7-2004
| | Posted on Friday, May 13, 2005 - 9:19 am: |
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I always wanted to float a antenna real
high up in the air with a Hot Air
Balloon...LOL...
Allagator it must be that new black hole
thats developing up in the sky. Its
Swallowing up all your signal...Hummmm
In other words, got me stumped too...
JIM/ PA/ CEF 375 |
Crackerjack
Intermediate Member
Username: Crackerjack
Post Number: 473
Registered: 7-2004
| | Posted on Friday, May 13, 2005 - 10:38 am: |
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We played with weather balloons for emergency antennas -long wire, when I was in the Navy.
They actually work well, just not too practical.
Oh, illegal for civilians, if they go over 60 feet! |
Allagator
Advanced Member
Username: Allagator
Post Number: 598
Registered: 9-2002
| | Posted on Friday, May 13, 2005 - 4:42 pm: |
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ok i got it !
im in the dead skip hole ! LOL
but rite now im going to keep up on this till i figure it out or i move from this place ! LOL
Thanks guys !
Allagator |
Road_warrior
Advanced Member
Username: Road_warrior
Post Number: 555
Registered: 7-2004
| | Posted on Friday, May 13, 2005 - 7:00 pm: |
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Ok, lets get thing straight here...LOL
Did you live at your home for a long time
and was getting out good, but, suddenly
now your not???
Or did you just move there and can't find
a good spot except when antenna is hanging
in a tree or flying on the tail of a kite
at 90ft??? Do you live near Area 51???
I'm so confused!
JIM/ PA/ CEF 375 |
Allagator
Advanced Member
Username: Allagator
Post Number: 600
Registered: 9-2002
| | Posted on Friday, May 13, 2005 - 9:02 pm: |
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Road warrior i have lived here for 5 or so months now and it seems like almost of my skip has gone bye bye !
and even part of my locals is hard to hear !
but from the 30 to 60 foot i seam to loose everything ! get past that and im good ! so im thinking about adding another 20 foot to the tower !
Allagator ! in the blackhole of skip ! LOL
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Allagator
Advanced Member
Username: Allagator
Post Number: 601
Registered: 9-2002
| | Posted on Saturday, May 14, 2005 - 12:26 am: |
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well i think 291 has the blackhole of no skip now ! LOL cause ive been talking to shady in FL like he was one of my locals ! and he even walked on 2 of my not so close locals ! LOL
things are looking better !
hope sunday is better too !
and shady watch for my locals ! they wil be trying to pull some extra power to get to ya sunday ! !!!!
Allagator
CEF115
MIDWEST AM NET-CONTROL !
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Bigbob
Senior Member
Username: Bigbob
Post Number: 1888
Registered: 12-2001
| | Posted on Saturday, May 14, 2005 - 2:20 pm: |
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Well the topography of the surrounding land,may have something to do with your troubles,from what I understand there are rock outcroppings and boulders in various parts of Ill.which can have a deliterious effect on ground wave propagation,you need not be close to these to "feel" their effect,depending on their make-up they can aid or detract from local comunications.It just may be of tremendous benefit to you to get your antenna as high as feasibly possible to take advantage of uninhibited ground-wave,wherefore a low antenna such as 20 feet may be relying more on short skip conditions,which may take some experimenting to decipher.Here in northern michigan I can barely copy people at 90 mi.,but most of the time short skip will let me talk to people 150 to 250 mi. north,but not so south.The topo. of this area is codusive to local out to 90 mi. south,but only 50 mi. north,2 mi. west,120 miles east.Check your area you may be surprised at what you find.Bigbob |
