[time-nuts] Can a Trimble Thunderbolt cause QRM? Noise can be seen remotely via my SDR.

[paul swed]

Chris
Thanks for pointing the site out.
I did take a listen at 10 MHz and would guess that instead of a nice steady
carrier due to 10 MHz leakage, I hear 50 or 100 Hz hum modulating it. I
also see lots of spurs that sound like a totally free running oscillator.
The nasty type thats all over the place. I did look at other frequencies
from 100 KHz to 25 MHz to see if anything popped out. Nothing really
obvious.
Regards
Paul
WB8TSL

On Tue, Jan 12, 2021 at 9:14 PM Bob kb8tq <kb8tq at n1k.org> wrote:

> Hi
>
> Best guess is that it’s driving a fairly long un-terminated cable. It
> could easily have come
> loose at some point. Indeed there are other possibilities. It depends
> quite a bit on just what
> the TBolt is driving …
>
> Bob
>
> > On Jan 12, 2021, at 6:30 PM, Chris Wilson <chris at chriswilson.tv> wrote:
> >
> >
> >
> >  12/01/2021 23:21
> >
> > I have had a sudden occurrence of interference on all my HF receivers /
> transceivers recently.  I cannot gain access to the remote location where
> they are and am operating them remotely at the moment. At the site is my
> Trimble Thunderbolt and it's been on permanently for several years with no
> apparent issues. It feeds a divider by David Partridge. I am wondering if
> the TB could be the source of the QRM in some way as it's bang on 10MHz. I
> no longer see WWV but a very loud noise on all receivers on 10MHz, 20MHz
> and 30MHZ. If I zoom right in I see what looks like FSK on the signal. The
> spurs are all over the place and particularly bad, if they are indeed spurs
> of the 10MHz noise, around 21 MHz.
> >
> > Would some Sherlock Holmes who is familiar with remote operating a Kiwi
> SDR receiver have a look around and tell me if they think the TB could have
> gone berserk in some way please? I can't think of any other 10Mhz source at
> the location. Thanks and a belated happy and healthy New Year to all.
> >
> > The Kiwi can be accessed at:
> >
> > http://82.70.254.222:8073/
> >
> > --
> >       Best Regards,
> >                   Chris Wilson.
> > mailto: chris at chriswilson.tv
> >
> >
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