On 6 feb, 18:44, "Robert Lacoste" see-alciom-dot-com wrote:
Hello,

I am looking for the antenna factors table for a Eaton 94455-1 biconical
antenna (20MHz to 200MHz). Does someone have a calibration table for a
similar antenna around, or a manual for this antenna model ?

More exactly I have found some K factors for it but they seems wrong, except
if I'm wrong with the units somewhere. I have a table with figures ranging
from "47" (65MHz) up to "59" (200MHz). Assuming these figures are in dB/m
this would give a gain of -44dBi at 160MHz (K = 20 log(F in MHz) - G - 29.8
isn't it ?). The result is not reasonnable... and not at all compatible with
the measurements.

Are my K factor figures wrong, or is my calculation wrong somewhere ?

Thanks for your help !
Yours,
Robert

Hello Robert,

AF (K) for Eaton 94455-1 as a receive antenna:

30, 13.7
40, 13.5
50, 12.4
70, 7.7
100, 10.2
140, 16.0
160, 17.5
200, 12.5
Frequency in MHz, K in dB/m.

I don't have the manual, values are from a report, original source
unknown. It would be nice when somebody could confirm these values.

Hope this helps you a bit.

Best regards,

Wim
PA3DJS
www.tetech.nl
when you remove abc, the address is OK.

Wimpie wrote:

Hello Robert,

AF (K) for Eaton 94455-1 as a receive antenna:

30, 13.7
40, 13.5
50, 12.4
70, 7.7
100, 10.2
140, 16.0
160, 17.5
200, 12.5
Frequency in MHz, K in dB/m.

I don't have the manual, values are from a report, original source
unknown. It would be nice when somebody could confirm these values.

Hope this helps you a bit.

Best regards,

Wim
PA3DJS
www.tetech.nl
when you remove abc, the address is OK.

It's been a long time since I've done field strength measurements, but I
recall that each antenna came with a calibration chart for that
particular antenna -- that's really what you're paying for when you buy
one. I wouldn't expect a great deal of difference from one to another,
but don't have the experience to say how much variation you might expect.

Roy Lewallen, W7EL

"Roy Lewallen" wrote in message
...
Wimpie wrote:

Hello Robert,

AF (K) for Eaton 94455-1 as a receive antenna:

30, 13.7
40, 13.5
50, 12.4
70, 7.7
100, 10.2
140, 16.0
160, 17.5
200, 12.5
Frequency in MHz, K in dB/m.

I don't have the manual, values are from a report, original source
unknown. It would be nice when somebody could confirm these values.

Hope this helps you a bit.

Best regards,

Wim
PA3DJS
www.tetech.nl
when you remove abc, the address is OK.

It's been a long time since I've done field strength measurements, but I
recall that each antenna came with a calibration chart for that particular
antenna -- that's really what you're paying for when you buy one. I
wouldn't expect a great deal of difference from one to another, but don't
have the experience to say how much variation you might expect.

Roy Lewallen, W7EL

http://www.ets-lindgren.com/page/charts.cfm?i=3104C
Has typical cal charts for 3104C biconical. The
actual antennas are individually calibrated. The
antenna factors are not that far from Wim's example
above.

Frank

Thanks to all for your answers, all figures converge and seems to give an
approximate gain of 0dBi around 160MHz, consistent with our measurements.
Many thanks again !
Robert

Robert Lacoste wrote:
Thanks to all for your answers, all figures converge and seems to give an
approximate gain of 0dBi around 160MHz, consistent with our measurements.
Many thanks again !
Robert


Unity?

"Wimpie" a écrit dans le message de news:
...
On 6 feb, 18:44, "Robert Lacoste" see-alciom-dot-com wrote:
Hello,

I am looking for the antenna factors table for a Eaton 94455-1 biconical
antenna (20MHz to 200MHz). Does someone have a calibration table for a
similar antenna around, or a manual for this antenna model ?

More exactly I have found some K factors for it but they seems wrong,
except
if I'm wrong with the units somewhere. I have a table with figures
ranging
from "47" (65MHz) up to "59" (200MHz). Assuming these figures are in dB/m
this would give a gain of -44dBi at 160MHz (K = 20 log(F in MHz) - G -
29.8
isn't it ?). The result is not reasonnable... and not at all compatible
with
the measurements.

Are my K factor figures wrong, or is my calculation wrong somewhere ?

Thanks for your help !
Yours,
Robert

Hello Robert,

AF (K) for Eaton 94455-1 as a receive antenna:

30, 13.7
40, 13.5
50, 12.4
70, 7.7
100, 10.2
140, 16.0
160, 17.5
200, 12.5
Frequency in MHz, K in dB/m.

I don't have the manual, values are from a report, original source
unknown. It would be nice when somebody could confirm these values.

Hope this helps you a bit.

Best regards,

Wim
PA3DJS
www.tetech.nl

Many thanks Tim, that's exactly what I was looking for !
Robert