| Home |
| Search |
| Today's Posts |
|
|
|
#1
December 4th 07, 01:33 AM
posted to rec.radio.amateur.antenna
|
|||
|
|||
Coils, why?
Richard Harrison wrote:
... Best regards, Richard Harrison, KB5WZI Richard: I'll break down and be honest, I cannot "dust you off." However, how much "Q" is there in a straight wire radiator? And, in "linear loading" that much of an "hinderence?" You know, I have no horse here either--come to think of it! Warm regards, JS |
|
#2
December 4th 07, 04:36 AM
posted to rec.radio.amateur.antenna
|
|||
|
|||
|
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 |
|
#3
December 4th 07, 05:05 AM
posted to rec.radio.amateur.antenna
|
|||
|
|||
|
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 |
Hybrid Mode
