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-   -   Coils, why? (https://www.radiobanter.com/antenna/127851-coils-why.html)

John Smith December 4th 07 03:39 AM

Coils, why?
 
Yuri Blanarovich wrote:

...

73 Yuri, K3BU.us



Oh yeah, I trust you are here legally, right? Would hate to call
immigration on "another one!" chuckle

JS

Richard Harrison December 4th 07 04:36 AM

Coils, why?
 
John Smith wrote:
"However, how much "Q" is there in a straight wire radiator?"

That`s easy. Arnold B. Bailey has already done all the work for us in
"Antennas and Other Receiving Antennas", but it depends on how fat the
wire is.

For a thin-wire dipole, the 3 dB down bandwidth is 34%, so
F2-F1/Fo=0.34. For Bailey`s 200 MHz antenna, BW = F/Q and Q = 200/68=
2.94.

Best Regards, Richard Harrison, KB5WZI


John Smith December 4th 07 05:05 AM

Coils, why?
 
Richard Harrison wrote:

...

For a thin-wire dipole, the 3 dB down bandwidth is 34%, so
F2-F1/Fo=0.34. For Bailey`s 200 MHz antenna, BW = F/Q and Q = 200/68=
2.94.

Best Regards, Richard Harrison, KB5WZI


Thanks Richard, good math! So many won't take the time ...

Warm regards,
JS

Yuri Blanarovich December 4th 07 02:54 PM

Coils, why?
 

"John Smith" wrote in message
...
Yuri Blanarovich wrote:

...

73 Yuri, K3BU.us


Oh yeah, I trust you are here legally, right? Would hate to call
immigration on "another one!" chuckle

JS


Your "brilliance" is blinding!

I admire Cecil for having patience to engage with such brilliant minds. :-)

Time to grow up from diapers?

Yuri



John Smith December 4th 07 08:17 PM

Coils, why?
 
Yuri Blanarovich wrote:

...
Your "brilliance" is blinding!

I admire Cecil for having patience to engage with such brilliant minds. :-)

Time to grow up from diapers?

Yuri



Ahhh, that just felt good ...

JS


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