Re: Topband: HEBA antenna

2024-04-20 Thread Jim Brown
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

Re: Topband: HEBA antenna

2024-04-20 Thread Joe Subich, W4TV
On 4/20/2024 11:57 AM, Richard (Rick) Karlquist wrote: > No one has commented on the "High Efficiency" "Broadband" claims, Unfortunately, "High Efficiency" and "Broadband" are relative terms and have a different meaning to the AM broadcasters than they do to amateurs. They amount to nothing more

Re: Topband: HEBA antenna

2024-04-20 Thread Richard (Rick) Karlquist
No one has commented on the "High Efficiency" "Broadband" claims, so I will. No antenna of this size will simultaneously have both high efficiency and wide bandwidth, according to established limits in the literature. See K6OIK's Pacificon paper with the latest refinements to these limits. Ad