Hi all,

What's the delay (in degrees) 1/10 lambda coax (for a given freq.)
introduces considering its velocity factor ??

ik3umt wrote:
What's the delay (in degrees) 1/10 lambda coax (for a given freq.)
introduces considering its velocity factor ??

Well, let's see. 1/10 of 360 degrees = 36 degrees.
What am I missing?
--
73, Cecil http://www.qsl.net/w5dxp


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I agree. The question assumes the coax is 1/10 wavelength considering VF. -
so 36 degrees is a slam-dunk.
But 'delay' infers there is another signal to be compared to for the delay.
If you compare the signal on one end of the coax to the signal on the other
end of the coax, then there's your delay.



"Cecil Moore" wrote in message
...
ik3umt wrote:
What's the delay (in degrees) 1/10 lambda coax (for a given freq.)
introduces considering its velocity factor ??

Well, let's see. 1/10 of 360 degrees = 36 degrees.
What am I missing?
--
73, Cecil http://www.qsl.net/w5dxp

thanks all, sincerely i'm working around raibeam modelling, but
argument seems other than easy !!
I'm scaling one home made to 7.1 MHz but only to duplicate dimensions
seems not the only one thing to do .....

Someone has tried ??

TNX

ik3umt wrote:
thanks all, sincerely i'm working around raibeam modelling, but
argument seems other than easy !!
I'm scaling one home made to 7.1 MHz but only to duplicate dimensions
seems not the only one thing to do .....

Someone has tried ??

Is a raibeam two driven elements with a phasing harness?
--
73, Cecil http://www.qsl.net/w5dxp


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Cecil Moore wrote:
ik3umt wrote:

thanks all, sincerely i'm working around raibeam modelling, but
argument seems other than easy !!
I'm scaling one home made to 7.1 MHz but only to duplicate dimensions
seems not the only one thing to do .....

Someone has tried ??


Is a raibeam two driven elements with a phasing harness?

According to an ARRL September, 1997, review of the Raibeam RB-206B (6
meters), it is a two-element HB9CV-type antenna. They go on to say

"In that design, two
dipole elements are driven out of phase
with respect to each other and closely
spaced."

The article footnote says

"For a description of the HB9CV mini-beam,
see the RSGB VHF UHF Manual (4th edition),
G. R. Jessop, G6JP, ed, pp 8.30 and
8.31."

Cheers,
John

It depends.

First, ONLY IF THE TRANSMISSION LINE IS TERMINATED IN ITS CHARACTERISTIC
IMPEDANCE: If the coax is 1/10 *electrical* wavelength, the delay is 36
degrees (360 * 1/10). If it's 1/10 *physical* wavelength (that is, the
physical length of the line is 1/10 of a free space wavelength), the
delay is 36/VF degrees where VF is the velocity factor.

IF THE TRANSMISSION LINE ISN'T TERMINATED IN ITS CHARACTERISTIC
IMPEDANCE, the delay of voltage and current won't be the same and,
depending on the load impedance, both can be very different from the
delay when the line is terminated in its characteristic impedance. The
voltage and current delays can be known only if the characteristic
impedance of the line, the impedance of the load, and the electrical
length of the line are known(*).

(*) Actually, you only need to know the ratio of the load impedance to
the line's characteristic impedance and not their actual values.

Roy Lewallen, W7EL

ik3umt wrote:
Hi all,

What's the delay (in degrees) 1/10 lambda coax (for a given freq.)
introduces considering its velocity factor ??