[TangerineSDR] [EXTERNAL] Re: Testing magnetometer with nearby RF

[Tom McDermott]

Hi Bill - looking at differences in the noise level in several of the ham
bands 160 - 6 meters would be good.
Additionally, looking at the clock frequencies of I2C chip would also be
good. My recollections
is that the chip is capable of operating at 100 kbps, 1 Mbps, 4 Mbps, so
those would be candidates.
I'd expect to at least see weak clock lines at the current setting of the
device.  Do you know what
bit rate that Dave's software currently sets up for I2C operation?

-- Tom, N5EG



On Tue, May 25, 2021 at 2:15 PM Bill Engelke via TangerineSDR <
tangerinesdr at lists.tapr.org> wrote:

> Tom – I am able to listen across a wide variety of frequencies – I can try
> that – though, I am a bit fuzzy on what to listen for – I can try turning
> the device on and off and observe the waterfall on the Flex and see if
> anything shows up, at least in the ham bands – any other suggestions?    -
> tnx es 73- Bill
>
>
>
> *From:* TangerineSDR <tangerinesdr-bounces at lists.tapr.org> *On Behalf Of *Tom
> McDermott via TangerineSDR
> *Sent:* Tuesday, May 25, 2021 12:48 PM
> *To:* TAPR TangerineSDR Modular Software Defined Radio <
> tangerinesdr at lists.tapr.org>
> *Cc:* Tom McDermott <tom.n5eg at gmail.com>
> *Subject:* [EXTERNAL] Re: [TangerineSDR] Testing magnetometer with nearby
> RF
>
>
>
> 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:
>
>
>
>
>
> --
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