[Elecraft] Fwd: K4 SDR version

[Wes]

I understand that, however the weird pattern is daytime and nulls some of their 
service area. I doubt they are protecting any of those stations, especially as I 
understand it protection only extends 750 miles anyway..  The nighttime pattern 
is more-or-less a cardioid, without any deep nulls, and pointed south toward 
downtown.

Wes  N7WS

On 7/23/2019 5:10 PM, Joe Subich, W4TV wrote:
> On 2019-07-23 7:42 PM, Wes wrote:
>> Why escapes me, as there is no one to service in my direction.
>
> Typically AM patterns are designed to put nulls in the direction
> of stations that a secondary user of a frequency must protect.
> From the list of stations on 1030, I suspect KVOI is required to
> protect WBZ (Boston), KTWO (Casper WY) and possibly XEQR (Mexico
> City).
>
> Looking at the protection requirements along with what is possible
> when it comes to antenna patterns will often lead one to understand
> the reason for "crazy" patterns (particularly nigh time patterns).
>
> 73,
>
>    ... Joe, W4TV