KFBK in Sacramento uses [or used, my info is a few years old] a
center-fed half-wave vertical ["Franklin"] antenna, said to be the only
one left. It's ... interesting. [:-) KFBK is also the originator of
the first out-phasing BC TX which became the RCA Ampliphase [or
Amplifuzz if you ever had to get one to pass PoP]. KFBK is also the
radio birthplace of Rush, "Bloviator in Chief," although that's probably
far less important than the Franklin. There was a radial field under
the Franklin, it may have rusted into oblivion by now, I'm not sure it
was all that important, it's located in the flood plain north of
Sacramento ... moderately wet, they grow rice in the area.
73,
Fred ["Skip"] K6DGW
Sparks NV DM09dn
Washoe County
On 2/12/2017 5:31 PM, Jim Brown wrote:
Not true, Ron. Most AM broadcast transmitting antennas are in the
range of 80-90 electrical degrees (a quarter wave). Nearly all of the
Class I clear channel stations use antennas that are at least 180
electrical degrees. You can see this data for any US station at
https://www.fcc.gov/media/radio/am-query
WLW's tower is 189.3 degrees. So is WLS. WGN is 195 degrees. WBZ
uses an array of four towers that are 188.5 degrees. WIND on 560 kHz
near Chicago, has an array of four 100 degree towers. The station
where I worked in my home town has an array of four 82 degree towers.
And so on.
73, Jim K9YC
On Sun,2/12/2017 9:13 AM, Ron D'Eau Claire wrote:
Most BCB (0.5 to 1.6 MHz) antennas are 1/8 wavelength high (or less)
which necessitates an extensive ground system.
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