[time-nuts] Maser 0.7 nsec jumps solved

[paul swed]

One more thought.
Is the aircon on the same power phase as the maser?
Are you split phase in the facility at least.

On Fri, Jun 3, 2016 at 9:24 AM, paul swed <paulswedb at gmail.com> wrote:

> Jim,
> My head is precisely in the get it away from the unit approach.
> Did not mention it for the following reason.
> Its well understood and for time-nut boring. Its more fun to figure out
> peak currents and such.
> But I tend to fall into the get it done camp and move on.
> That doesn't mean its a simple answer. Flex duct is bad. So only use it in
> the last few feet. You want low resistance hard duct.
> Then the fun of the return feed. Often overlooked and poorly considered.
> Regards
> Paul
> WB8TSL
>
> On Fri, Jun 3, 2016 at 1:00 AM, Jim Palfreyman <jim77742 at gmail.com> wrote:
>
>> Hi All,
>>
>> Thanks so much for your input and thoughts. It has really proved helpful
>> here at the observatory.
>>
>> As it turned out we easily obtained a zero-crossing solid state relay so
>> we
>> thought we'd try it.
>>
>> And, drumroll......
>>
>>
>>
>> It made things so much terribly *worse* than ever before. (As predicted by
>> many of you above.)
>>
>> We are going to try a SSR that switches at the peak - but we need to order
>> one. So stay tuned on those results.
>>
>> There is of course the "move the bloody thing far away from the maser"
>> solution which could end up being a serious option. These air conditioning
>> units are small and cheap (window-type), so we are trying to find the
>> cheapest solution - and if that ends up being some ducting - so be it!
>>
>>
>> Jim Palfreyman
>>
>>
>>
>> On 26 May 2016 at 13:13, Andy <AI.egrps+tn at gmail.com> wrote:
>>
>> > On Wed, May 25, 2016 at 12:59 PM, Mike Monett <
>> timenuts at binsamp.e4ward.com
>> > >
>> > wrote:
>> >
>> > LTspice shows  switching  at 0V is the best point in  time.  ...
>> >
>> >
>> >
>> > Bzzzt!  Your simulation is seriously flawed, and your conclusions are
>> > wrong.  What you forgot, or may not have realized, is that SPICE's
>> initial
>> > transient solution is obtained by having the signal sources already
>> turned
>> > on (at the moment of the Big Bang) and set to their initial value, so
>> the
>> > current through L2 is limited by DC conditions.  That is not anything
>> close
>> > to switching the driving voltages on.  It is having one waveform sit at
>> > +169.7V DC for a very long time ('forever'), and then letting it follow
>> a
>> > cosine wave.
>> >
>> > Re-run the simulation with "UIC" added to the .tran statement (.tran
>> 50ms
>> > uic) and see what it shows.  Using UIC forces the initial voltage to be
>> 0V
>> > at time=0, the start of the simulation.  That's like having the switch
>> > initially open.
>> >
>> > Or if you don't like that, multiply the sources by a PWL waveform that
>> > starts both voltages at 0V and then switches them on, a few milliseconds
>> > into the simulation, with the appropriate phase.
>> >
>> > Or use an actual switch.  LTspice has a switch element you could use.
>> >
>> > I guarantee you, the case with the voltage switching on at the 0V point
>> in
>> > the voltage waveform, causes greater currents.
>> >
>> > The smaller surge current happens when the source is connected at the
>> > moment when the current i(t) would be 0A if it were a continuous
>> waveform.
>> > For an inductive load, this happens when the voltage v(t) would be +/-
>> peak
>> > (or near peak, for a real load which has both inductance and a little
>> > resistance).  This condition also results in no surge, thus no L/R
>> decay.
>> >
>> > All of this might not be relevant to a mechanical system, where surge
>> > current is caused by rotational inertia, rather than anything
>> electrical.
>> >
>> > Regards,
>> > Andy
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