Ah, I wish it was that simple! It's been back for several days now
and runs its' cycle non-stop.
The only good thing about it is that it's every 30 Khz and not every
10! For the most part it stays away from my PSK and CW frequencies and I
can work around it somewhat.
Thanks, Jose es 73
Dave
KB3MOW
Jose A. Amador wrote:
>
> It might be a switching PSU on standby mode. I know one TV set that
> cycles in a similar way (producing some 'reverse TVI"), even when the
> numbers are not the same, it starts, charges the main capacitor, goes
> into standby and restarts when its voltage diminishes under a certain
> threshold.
>
> 73,
>
> Jose, CO2JA
>
> Dave 'Doc' Corio wrote:
>
> > Thanks for the info, Bruce. I didn't have a chance to record it or
> > measure it accurately before it disappeared Friday evening some
> time. As
> > to if it's time synced, I would have to guess that it is. It was
> > extremely close to 10 seconds on and 5 seconds off, and the number of
> > pulses was 55 during the "on" period. Granted, timing it with a
> > stopwatch is not exactly precise, but it was close enough that I'm
> > reasonably certain it's timed somehow.
> >
> > The simple fact that it stopped Friday night leads me to believe
> > it's some type of commercial activity. I've had the rig on a lot this
> > weekend, and haven't heard it once. It also stopped before I could log
> > exactly where it was. If I'm lucky, it's gone, never to return. I doubt
> > it, however. If it comes back, I'll get a recording of it and post it.
> > If you have a recording of yours, please send it to me! May not help,
> > but it sure couldn't hurt!
> >
> > Tnx es 73
> > Dave
> > KB3MOW
> >
> >
> > Bruce Sawtelle wrote:
> >> Hi Dave,
> >>
> >> I have a similar type noise in our neighborhood. By doing some DF'ing,
> >> we've pinned it down to a neighbor's house, but haven't been
> >> successful yet in gaining their confidence to let us explore beyond
> >> their front door. Can here it on VHF when we're at their front porch.
> >>
> >> Is it "time synced", i.e. is the accuracy such that it's being derived
> >> from a 60Hz/Xtal time base. In my case, it's not. It comes on for
> >> APPROX 12 seconds and goes off for APPROX 3 seconds, but if I listen
> >> to it over a few minutes, it will drift up or down. Also, I noticed I
> >> can hear it at ~ 16.7KHz "offsets", which makes me think it could be
> >> PC video related. Not sure if it could be switching power supply
> >> related, I thought most of them were 100's Khz. Actually, It had been
> >> across the full 20M band last year when we were DF'ing, but now it's
> >> "discrete". I have a wav file I can send you if that would help.
> >>
> >> Fortunately, it's been down to S2-3 as of late. It also seems to be
> >> tied to colder weather (thermostat control??). BTW, the neighbor is
> >> 300-400 feet away in a suburban area (70' x 120' lots) . W5AHC is
> >> another ham in the neighborhood and he's ~100 fett closer and hears it
> >> as well.
> >>
> >> Hope this helps. Let me know what it ends up being.
> >>
> >> tnx es 73
> >> Bruce - W3NJ
>
>
