RFI
[Top] [All Lists]

Re: [RFI] Link-coupled loop - more.

To: <n0tt1@juno.com>, <rfi@contesting.com>
Subject: Re: [RFI] Link-coupled loop - more.
From: "Leigh Sedgwick" <bipi@comcast.net>
Date: Tue, 1 Apr 2014 17:35:05 -0700
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
How about a smart phone?

-----Original Message-----
From: RFI [mailto:rfi-bounces@contesting.com] On Behalf Of n0tt1@juno.com
Sent: Tuesday, April 1, 2014 16:26
To: rfi@contesting.com
Subject: Re: [RFI] Link-coupled loop - more.

> We carefully plotted the bearings we took on a map of our area of the 
> city.
 
I've often thought about attaching, say, a boat or auto compass to the loop
support....might make the plotting easier.
 
Does anyone know of a "good" model of compass that would work for that
purpose?
 
73,
Charlie, N0TT
 
On Tue, 01 Apr 2014 15:24:23 -0700 "Kenneth G. Gordon"
<kgordon2006@frontier.com> writes:
> OK. My son, Brendan KB7QEU and I went out after lunch and took 8 more
> 
> bearings with one of Tom Thompson's loops which I had constructed over 
> the past few days.
> 
> Tom's loop tunes VERY sharply. I intend to add a bandswitch, a large 
> scale, and a vernier dial to it to make it both easier to peak and 
> easier to take down a data point.
> 
> We carefully plotted the bearings we took on a map of our area of the 
> city.
> 
> I connected the loop to the FT-890 in AM mode (BW 6 KHz), tuned to
> 3573.5
> KHz where "my" noise peaks, and used the FT-890's "S" meter to take
> 
> readings.
> 
> First of all, the nulls are not quite as sharp, nor as deep, as those 
> I get with a shielded loop, but they suffice. (The shielded loop I was 
> using would commonly show a difference from null to peak of over 30 
> db, while the unshielded loop most often provides a difference of only 
> about 10 db).
> 
> The results we plotted are somewhat confusing to me as three of the
> 
> bearings did not result in anything common to the other five.
> 
> 4 of the bearings definitely converge on an area that appears to be 
> around an area of about 1 square block which is 4 blocks east of us.
> 
> A 5th is close, but outside the convergence zone of the other 4.
> 
> Signal strengths became greater as we got up on a hill to the east of 
> my station which is also nearer to that 1 block area than some other 
> bearings.
> 
> Those three bearings that gave confusing results were the weakest 
> ones, and the differences between the null and a peak were only about 
> 1 "S" unit.
> 
> However, one odd thing is that two of those three bearings, if I take 
> a 90 degree normal bearing to those, both show up in the same area as 
> the
> 4
> "good" bearings. One, in fact, is exactly coincident at its end with 
> two of the other "good" bearings.
> 
> I don't know how to read those odd ones, but I am not in the habit of
> 
> throwing out data points just because they don't "fit" either. So I 
> don't know what to do about them right now.
> 
> I suppose I should drive over to that spot 4 blocks east of us and 
> take a look around, then take some more bearings.
> 
> Probably tomorrow...
> 
> Ken W7EKB.
> _______________________________________________
> RFI mailing list
> RFI@contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi
> 

_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi

_______________________________________________
RFI mailing list
RFI@contesting.com
http://lists.contesting.com/mailman/listinfo/rfi

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