[TangerineSDR] TangerineSDR Digest, Vol 26, Issue 15

Ward Silver hwardsil at gmail.com
Tue May 25 15:05:59 EDT 2021


I suggest 2m and 70cm transmissions of 10-50 watts within 10 feet of the
installation and with three-axis antenna orientation using a full-size
dipole.  Cabling and internal conductors are electrically much longer at
those frequencies and more likely to pick up significant energy.

73, Ward N0AX

On Tue, May 25, 2021 at 12:49 PM <tangerinesdr-request at lists.tapr.org>
wrote:

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>    1. Re: Testing magnetometer with nearby RF (Tom McDermott)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 25 May 2021 10:48:23 -0700
> From: Tom McDermott <tom.n5eg at gmail.com>
> To: TAPR TangerineSDR Modular Software Defined Radio
>         <tangerinesdr at lists.tapr.org>
> Subject: Re: [TangerineSDR] Testing magnetometer with nearby RF
> Message-ID:
>         <
> CACO3nRR1exNE+2qZ2v_+m-6zzX4LTU4A9M-gvquvLHBeSArqwg at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> HI BIll - encouraging news from a susceptibility perspective !
>
> The other concern would be noise radiated by the magnetometer, cabling, and
> activity.
> Do you have the capability to listen on HF to see if the magnetometer
> causes noise when
> you make readings?
>
> -- Tom, N5EG
>
> On Tue, May 25, 2021 at 9:02 AM Bill Engelke via TangerineSDR <
> tangerinesdr at lists.tapr.org> wrote:
>
> > I have a TAPR magnetometer in the ground (sitting at 24? deep).
> >
> >
> >
> > I have tested for RF exposure as follows:
> >
> >
> >
> > 80 M dipole, about 20? away and 15? elevation,  1500 W on 80M
> >
> > 30 M vertical, about 60? away  200W (legal limit) on 30M
> >
> > 40 M double bazooka about 50? away and at 30? elevation, 1500 W on 40M
> >
> > DX Engineering hexbeam, on 50? tower, base of which is 70? away, 1500 W
> on
> > 20M, 17M, 15M, 12M, 10M
> >
> > 4-element 6 meter beam on 50? tower which is about 70? away, 500 W on 6 M
> >
> >
> >
> > There was no discernable effect on magnetometer readings from any of
> these
> > tests, which were a carrier for 10 seconds at the noted power level.
> >
> >
> >
> > If anyone has ideas for additional tests, please advise; based on the
> > above, my impression is that the current magnetometer should produce good
> > results when in the yard of typical ham installation.
> >
> >
> >
> > -73-  Bill,   AB4EJ
> >
> >
> >
> > Magnetometer installation:
> >
> >
> >
> >
> >
> > --
> > TangerineSDR mailing list
> > TangerineSDR at lists.tapr.org
> > http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org
> >
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> End of TangerineSDR Digest, Vol 26, Issue 15
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