You both have been very helpful in beginning to understand the schematics of antennas.
Todd in Woodbury Mn Sony ICF 2010, Toyota car radio On Dec 2, 2013 2:07 PM, "Mark Durenberger Mobile" <[email protected]> wrote: > No...that's referring to the Day "Franklin." > > The tower height is related to the frequency. To build a Franklin you'd > need twice the "normal" tower height, so a Franklin or "Baby Franklin" are > practical only at the higher frequencies where wavelengths are shorter. > (FYI: KSTP's nighttime array uses antennas that are closer to the 'normal' > length for 1500...though a bit short). > > So, yes, KSTP's high tower height is because they chose to install a > Franklin-type antenna. SE Hubbard wanted to give his station every > advantage. While being on 1500 is a disadvantage (compared for example to > WCCO at 830)** the use of a Franklin approach helped to slightly overcome > that difference. > > > ** Some propagation charts suggest there's a 6 db difference between > coverage from 830 and 1500. That would mean KSTP (using a normal antenna) > would have needed 4 times WCCO's power, or 200,000 watts to match WCCO's > Field Strength. (Of course in the practical world the difference is > probably not that great.) > > > Mark Durenberger > On the Road > > -----Original Message----- From: Forrest Skaine > Sent: Sunday, December 01, 2013 1:02 PM > To: IRCA Mailing list for the International Radio Club of America > Subject: Re: [IRCA] Short antenna radials > > Did you mean that KSTP night facilities? I'm just trying to understand > because I'm just an amateur. If it is their day facilities is it because > that tower is taller than most? > Confused, > Todd in Woodbury Mn > Sony ICF 2010, Toyota car radio > On Dec 1, 2013 8:37 AM, "Mark Durenberger" <[email protected]> wrote: > > To add to Dennis' info: The KSTP antenna was/is a 179.4/179.4 and appears >> to be considered a "Sectional" rather than a Franklin by the FCC. >> Nit-picking' I guess. >> >> Happy Holidays! >> > > _______________________________________________ > IRCA mailing list > [email protected] > http://montreal.kotalampi.com/mailman/listinfo/irca > > Opinions expressed in messages on this mailing list are those of the > original contributors and do not necessarily reflect the opinion of the > IRCA, its editors, publishing staff, or officers > > For more information: http://www.ircaonline.org > > To Post a message: [email protected] > > _______________________________________________ IRCA mailing list [email protected] http://montreal.kotalampi.com/mailman/listinfo/irca Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers For more information: http://www.ircaonline.org To Post a message: [email protected]
