What I found interesting in the HEBA103 document was that it seemed the
FS measurements were taken at ground level along two compass points. If
I'm not mistaken, the power radiated is spread out over a 3-dimensional
space and from that standpoint, I don't see how improved FS measurements
taken on the near field at ground translate directly into "high
efficiency."
But on this topic, the only think I know **for certain** is that I'm a
mental micro-midget compared to Maxwell.
73/jeff/ac0c
alpha-charlie-zero-charlie
www.ac0c.com
On 4/20/2024 3:19 PM, Jim Brown wrote:
On 4/20/2024 9:18 AM, Joe Subich, W4TV wrote:
Similarly, to the AM broadcaster, "Broadband" simply means sufficient
bandwidth to keep the transmitter happy and avoid distortion of an
IBOC digital signal. That is far more narrow than even a "50 KHz
under 1.5:1" for amateurs on 160.
Great points, Joe. I grew up a mile or two from a 5kW DA-N on 930 kHz,
and as a college student worked at the station. One summer, I helped
the chief engineer silver-solder new radials to new ground screens for
the 4-tower array. The bandwidth issue jumped out at me as I drove
through one of their nulls -- where the carrier cancelled, the
sidebands didn't.
73, Jim K9YC
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