Sirio CB/AM/FM/CELL(900) Fuba Style Antenna

[juliemac57@hotmail.com (Julie Macfarlane)]

The cable is not included in the lenght. The antenna is on the electrically 
cold side of a tank circuit (a coil and a cap in parallel) that resonates at 
the desired frequency. The cable is shielded up to the tank and then out 
from there.
To calc this, try the following:

f=1/(2*3.1415926)(root L*C)
L=inductance of the coil
C=Capasitance

(Could not find a Pi or Root symbol... Sorry)
PLEASE don't ask me to transcribe that eq. It hurt just trying to remember 
it...



Julie Macfarlane
Menlo Park Research & Development
Internet Application Developer
Amsterdam NY





>From: "ATS - Patrick Bureau" <txrocco@sbcglobal.net>
>To: "Julie Macfarlane" <juliemac57@hotmail.com>,<scirocco-l@scirocco.org>
>Subject: RE: Sirio CB/AM/FM/CELL(900) Fuba Style Antenna
>Date: Wed, 29 Jan 2003 11:32:58 -0600
>
>Julie, you did get thinking about something you said
>
>"Either that or extra wire is added to balance the load at either the base
>or in the middle of the antenna"
>
>well I did a little exercise in math...as per specs on the web site;
>
>Antenna lengh = 450mm (1.476378  Feet)
>cable that emerges from antenna = 215mm (0.705381  Feet)
>Additional Cable = 5M = 5000mm (16.404199  Feet)
>
>If you add it all up, 5665mm = 18.585958 Feet,  which it's 2.065958 Feet
>(629,704mm) taller than Optimum.
>(you quoted 16.52 ft or 5035.296  Millimeters)
>
>Now the question is, is taller than 16FT a bad thing? I mean I have had 72"
>whips with 10ft cable, which is ~16ft, but after SWR adjustements I would
>like to know if there would be that much of a loss.
>
>The other thing is since it PL-259 cable and connectors (standard CB radio)
>I could just simply trim the extra 2.1 FT and splice in a new connector 
>then
>I would be in accordance to your stated rules of telecommunications.
>
>ATS - Patrick Bureau - txrocco@sbcglobal.net
>
>
>=>-----Original Message-----
>=>From: Julie Macfarlane [mailto:juliemac57@hotmail.com]
>=>Sent: Tuesday, January 28, 2003 9:49 PM
>=>To: txrocco@sbcglobal.net; vwscir88@hotmail.com; scirocco-l@scirocco.org
>=>Subject: Re: Sirio CB/AM/FM/CELL(900) Fuba Style Antenna
>=>
>=>
>=>A transmitter antenna must be wave lenght matched. Meaning that the full
>=>wave frequency for a 27 Mhz radio (cb) is 16.52 feet (both sides + & - of
>=>the sinusiodal waveform). Divisors of lenght are allowed but in
>=>even steps
>=>only. Mismatch the antenna and the forward moving wave (energy) can be
>=>reflected back to the transmitter and burn out the output stage.
>=>Therefore 1/2, 1/4, 1/8 wave antennas are good. Either that or
>=>extra wire is
>=>added to balance the load at either the base or in the middle of the
>=>antenna, and to fine tune the antenna a matcher (SWR) is added in line.
>=>I didn't see this antenna matching the correct frequency for a
>=>CB. Maybe the
>=>hand held FM jobs on 900 mhz, but not 27Mhz.
>=>Sorry boys
>=>
>=>
>=>Julie Macfarlane
>=>Menlo Park Research & Development
>=>Internet Application Developer
>=>Amsterdam NY
>=>
>=>
>=>
>=>
>=>
>=>>From: Patrick Bureau <txrocco@sbcglobal.net>
>=>>To: brett cooke <vwscir88@hotmail.com>, scirocco-l@scirocco.org
>=>>Subject: Re: Sirio CB/AM/FM/CELL(900) Fuba Style Antenna
>=>>Date: Tue, 28 Jan 2003 19:11:03 -0800 (PST)
>=>>
>=>>This antenna is actually a CB antenna with an Fm and
>=>>GSm coiled around the shaft, it is not a power FM
>=>>antenna in any way, that is what is different
>=>>and no you cannot use a standard FM antenna to
>=>>transmit CB radio signal, youll just end up burning up
>=>>your cb radio.
>=>>
>=>>Patrick
>=>>
>=>>--- brett cooke <vwscir88@hotmail.com> wrote:
>=>> > what is the difference betwwen this antenna and the
>=>> > stock antenna?
>=>> >
>=>>
>=>>_______________________________________________
>=>>Scirocco-l mailing list
>=>>Scirocco-l@scirocco.org
>=>>http://neubayern.net/mailman/listinfo/scirocco-l
>=>
>=>
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