Topband
[Top] [All Lists]

Re: Topband: EIRP Measurement

To: topband@contesting.com
Subject: Re: Topband: EIRP Measurement
From: Jack/W6NF <vhfplus@gmail.com>
Date: Tue, 21 Feb 2012 10:05:01 -0800
List-post: <topband@contesting.com">mailto:topband@contesting.com>
On 2/21/2012 8:26 AM, Joe Subich, W4TV wrote:
>   >  On Mon, 2012-02-20 at 19:04 -0700, Tod - ID wrote:
>   >
>   >  The important thing is to have a way to assure that when someone
>   >  measured the same field at the same point with the same type of
>   >  measurement device they would get the same measurement result.
>   >  That would allow us to compare measurements between different
>   >  people even if we did not know the absolute field strength value.
>
> I think simple, repeatable and accurate are a difficult triad.  What
> you are talking about is an accurate Field Intensity Meter (FIM) and
> getting stable calibrations with home constructed equipment is not
> going to be easy - let along easy to duplicate.  The closest solution
> is to use standard antennas (not simple whips) and calibrate them
> against broadcast signals at known locations and known field strengths.
>
> This will still require separate antennas for 160 and 630 meters and
> separate calibration sources on the appropriate ends of the standard
> broadcast band (due to the antennas).
>
> 73,
>
>      ... Joe, W4TV
>
>
> _______________________________________________
> UR RST IS ... ... ..9 QSB QSB - hw? BK
>
It's been many years since I have had to make any AM broadcast field 
measurements. I don't recall if the Potomac Instruments, or other, FIMs 
go much below 550kHz.

73,

-- 
Jack, W6NF
Silver Springs, NV
DM09ji

_______________________________________________
UR RST IS ... ... ..9 QSB QSB - hw? BK

<Prev in Thread] Current Thread [Next in Thread>