Copper Talk » Ask The Tech » Antennas » Swr flat at dead key talk and they jump up to 1.5 whats up « Previous Next »

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Grumpy
Intermediate Member
Username: Grumpy

Post Number: 133
Registered: 4-2005
Posted on Saturday, June 02, 2007 - 9:35 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Hi I have a dipole and it was flat on 1 and 40
now this i just picked up some new coax and still the same high swr
what went wrong
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Wildrat
Senior Member
Username: Wildrat

Post Number: 1302
Registered: 12-2003


Posted on Sunday, June 03, 2007 - 12:56 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Describe your problem a little more.
Does your swr go down when you stop talking?
WILDRAT
Mark
27.285MHZ
CEF674
CVC029
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Marconi
Advanced Member
Username: Marconi

Post Number: 726
Registered: 11-2001


Posted on Sunday, June 03, 2007 - 2:19 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Nobody is going to answer this with any real confidence without some real details. Don't be afraid to ask a real question.
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Dale
Advanced Member
Username: Dale

Post Number: 952
Registered: 12-2002
Posted on Sunday, June 03, 2007 - 7:53 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

was it the same type of coax/rg58,rg8x,rg8,ect
is it the same exact lenth
dale/a.k.a.hotrod
cef426
cvc#64
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Hotwire
Senior Member
Username: Hotwire

Post Number: 2233
Registered: 1-2005


Posted on Sunday, June 03, 2007 - 6:54 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

Grumpy, Reading your thread title... When checking your antennas SWR, dead key only. When you talk that uncalibrates the meter because your output wattage is changing.
Kenny
cef491(27.115lsb)
2sf491(27.555usb)
Indiana
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Grumpy
Intermediate Member
Username: Grumpy

Post Number: 134
Registered: 4-2005
Posted on Sunday, June 10, 2007 - 11:21 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

it's 1.2 on 40 and 1.1 on ch1 but when I talk it goes up a bit i'm on the 2rd floor do i need something like a mfj ground
how can i ground my radio stuff I thank that would help I use a dipole at a 45
thanks
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Kid_vicious
Senior Member
Username: Kid_vicious

Post Number: 2554
Registered: 9-2004


Posted on Sunday, June 10, 2007 - 11:12 pm:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

grumpy,
your SWR meter is not calibrated for when you are speaking, like hotwire said.
therefore, you cannot trust what the meter says when talking.

you do not need the MFJ ground.
sounds to me like that antenna is working just fine.
matt
anyone wanting a "clean signal", just look to the left and build one of these!!!
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Tech237
Moderator
Username: Tech237

Post Number: 806
Registered: 4-2004
Posted on Monday, June 11, 2007 - 8:44 am:   Edit Post Delete Post    Move Post (Moderator/Admin Only)

I wish people would stop worrying about an swr that is 1.8:1 or less - the amount of loss os negligable.

The reason your swr appears to change is exactly as Hotwire and Kid have indicated, your meter was calibrated for the power out with no modulation and is slightly off calibration when you speak into teh transmitting radio. Personally I'd be more concerned if it did not change.

Simon
Tech237
KD7IEB

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