[TangerineSDR] RFI and PSWS Magnetometer
Ward Silver
hwardsil at gmail.com
Thu Jun 3 14:02:50 EDT 2021
Thanks, Dave. I'm getting enough free time again that I could be a test
site if that is useful. I can also edit or proofread, if need be. Thanks
for the info on configuration!
Ward
FYI All of us that have been involved in the initial testing of the
Magnetometer boards are using cat6a shielded cables and shield
connectors. Dave Witten KD0EAG has created a draft install manual that is
being reviewed now and will be available on the tangerinesdr.com website
once the reviews are done.
Dave KV0S
On Thu, Jun 3, 2021 at 9:23 AM Ward Silver via TangerineSDR <
tangerinesdr at lists.tapr.org> wrote:
> (Changing the thread title to something more descriptive...)
>
> > Jonathan,
> > If necessary, we could probably reduce the i2c bus speed and still
> > easily meet the 1 per second magnetometer polling rate currently in use.
> > Jules-K2KGJ
>
> RFI from the digital data stream would be mostly generated by the edges of
> the I2C pulses and isn't really affected much by the bit rate. The edges
> have to remain sharp, so not a lot of relief there. I guess intermittent
> polling would result in bursts of RF which might be an improvement.
>
> I want to mention that we probably don't have a serious RFI. As Bill
> noted, the receive antenna is quite close to the unit and it is not an
> enormous increase in the noise floor.
>
> At this point, having noted a potential issue, I think the focus should be
> on proper metallic enclosures and shielding, including cable connectors,
> along with careful connections between the chassis and enclosure, in the
> configuration we expect to actually be deployed. Once that is available,
> more testing can be performed.
>
> 73, Ward N0AX
On Thu, Jun 3, 2021 at 12:42 PM <tangerinesdr-request at lists.tapr.org> wrote:
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> Today's Topics:
>
> 1. RFI and PSWS Magnetometer (Ward Silver)
> 2. Re: RFI and PSWS Magnetometer (Dave Larsen)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Thu, 3 Jun 2021 08:50:45 -0500
> From: Ward Silver <hwardsil at gmail.com>
> To: TAPR TangerineSDR Modular Software Defined Radio
> <tangerinesdr at lists.tapr.org>
> Subject: [TangerineSDR] RFI and PSWS Magnetometer
> Message-ID:
> <CAFr7d=qO7r2C=fU4pXU_bNz_QK05MOR1xNj=
> sp8VBoyTWVm+JA at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> (Changing the thread title to something more descriptive...)
>
> > Jonathan,
> > If necessary, we could probably reduce the i2c bus speed and still
> > easily meet the 1 per second magnetometer polling rate currently in use.
> > Jules-K2KGJ
>
> RFI from the digital data stream would be mostly generated by the edges of
> the I2C pulses and isn't really affected much by the bit rate. The edges
> have to remain sharp, so not a lot of relief there. I guess intermittent
> polling would result in bursts of RF which might be an improvement.
>
> I want to mention that we probably don't have a serious RFI. As Bill
> noted, the receive antenna is quite close to the unit and it is not an
> enormous increase in the noise floor.
>
> At this point, having noted a potential issue, I think the focus should be
> on proper metallic enclosures and shielding, including cable connectors,
> along with careful connections between the chassis and enclosure, in the
> configuration we expect to actually be deployed. Once that is available,
> more testing can be performed.
>
> 73, Ward N0AX
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>
> Message: 2
> Date: Thu, 3 Jun 2021 09:52:29 -0500
> From: Dave Larsen <kv0s.dave at gmail.com>
> To: TAPR TangerineSDR Modular Software Defined Radio
> <tangerinesdr at lists.tapr.org>
> Subject: Re: [TangerineSDR] RFI and PSWS Magnetometer
> Message-ID:
> <
> CALuQ3+zAuR+z_6ZTNEfmrE4VPZT8eXyLWkDO3wEFeJ0yws8CvA at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Ward
>
> FYI All of us that have been involved in the initial testing of the
> Magnetometer boards are using cat6a shielded cables and shield
> connectors. Dave Witten KD0EAG has created a draft install manual that is
> being reviewed now and will be available on the tangerinesdr.com website
> once the reviews are done.
>
> Dave KV0S
>
> On Thu, Jun 3, 2021 at 9:23 AM Ward Silver via TangerineSDR <
> tangerinesdr at lists.tapr.org> wrote:
>
> > (Changing the thread title to something more descriptive...)
> >
> > > Jonathan,
> > > If necessary, we could probably reduce the i2c bus speed and still
> > > easily meet the 1 per second magnetometer polling rate currently in
> use.
> > > Jules-K2KGJ
> >
> > RFI from the digital data stream would be mostly generated by the edges
> of
> > the I2C pulses and isn't really affected much by the bit rate. The edges
> > have to remain sharp, so not a lot of relief there. I guess intermittent
> > polling would result in bursts of RF which might be an improvement.
> >
> > I want to mention that we probably don't have a serious RFI. As Bill
> > noted, the receive antenna is quite close to the unit and it is not an
> > enormous increase in the noise floor.
> >
> > At this point, having noted a potential issue, I think the focus should
> be
> > on proper metallic enclosures and shielding, including cable connectors,
> > along with careful connections between the chassis and enclosure, in the
> > configuration we expect to actually be deployed. Once that is available,
> > more testing can be performed.
> >
> > 73, Ward N0AX
> > --
> > TangerineSDR mailing list
> > TangerineSDR at lists.tapr.org
> > http://lists.tapr.org/mailman/listinfo/tangerinesdr_lists.tapr.org
> >
>
>
> --
> KV0S - Dave Larsen
> Columbia, MO, USA
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