[ARC5] ARC5 Digest, Vol 105, Issue 155

Fri Oct 26 17:50:20 EDT 2012

Perhaps you should be thankful that you have found such a simple mechanism for clearing your space -- your Sanctum Sanctorum....

Tell the cats that "The Cat-Busters" are after 'em... 

"When there's stinkin' cats
In th' neighborhood
Who ya gonna call?
CAT-BUSTERS!"

Don't know how such an explanation might work with your XYL... but perhaps you can take things to a whole new level:  

If the Mk 2 set dyno gets to be "old hat," let me suggest an even finer device:  Try a 28 volt DC-115 volt AC 400 Hz inverter from an ARN-7 Radio Compass.

Guaranteed to not only clear a basement, but perhaps an entire house.  Perhaps even an entire apartment block.

The sound is like that of the love child of a Hoover Industrial Vacuum Cleaner and a Fire Truck Siren.  I have experience with both devices.  Plus the inverter.  I speak from experience.

73

Mike
W4DSE

--- On Thu, 10/25/12, Darryl Sage <trifid284 at gmail.com> wrote:

> From: Darryl Sage <trifid284 at gmail.com>
> Subject: Re: [ARC5] ARC5 Digest, Vol 105, Issue 155
> To: arc5 at mailman.qth.net
> Date: Thursday, October 25, 2012, 9:25 PM
> Hi guys i had a 19set #2 M xyl and 3
> cats were in the basement when i
> sterted the dynamotor the cats took off to hide under a bed
> my xyl shook
> her head as she left the basement owell     
> 73    darryl    ve3cpo
> 
> On Thu, Oct 25, 2012 at 12:53 AM, <arc5-request at mailman.qth.net>
> wrote:
> 
> > Send ARC5 mailing list submissions to
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> >
> > When replying, please edit your Subject line so it is
> more specific
> > than "Re: Contents of ARC5 digest..."
> >
> >
> > Today's Topics:
> >
> >    1. Re: Why an UNUN? (Neil)
> >    2. Re: Why an UNUN? (Neil)
> >    3. Re: Why an UNUN? (Mike Feher)
> >    4. Re: Why an UNUN? (J. Forster)
> >
> >
> >
> ----------------------------------------------------------------------
> >
> > Message: 1
> > Date: Thu, 25 Oct 2012 15:58:21 +1300
> > From: "Neil" <neilb at ihug.co.nz>
> > Subject: Re: [ARC5] Why an UNUN?
> > To: "arc5" <arc5 at mailman.qth.net>
> > Message-ID:
> <338D1B49C9D640969376EEC1D3C96068 at neilb>
> > Content-Type: text/plain;   
>    charset="iso-8859-1"
> >
> > > The 13 seems a bit high. Is there a lower limit
> given also? I don't have
> > > that manual to hand.
> >
> > I've seen a figure of 5 ohms, but I can't recall
> where.
> > Most likely on this very forum.
> >
> > 73 de Neil ZL1ANM
> >
> >
> > ------------------------------
> >
> > Message: 2
> > Date: Thu, 25 Oct 2012 16:03:13 +1300
> > From: "Neil" <neilb at ihug.co.nz>
> > Subject: Re: [ARC5] Why an UNUN?
> > To: "arc5" <arc5 at mailman.qth.net>
> > Message-ID:
> <DDCC699C353D4EEFA36F27E37DD44CA0 at neilb>
> > Content-Type: text/plain;   
>    charset="iso-8859-1"
> >
> > > A transmitter does not present a "load" as such to
> the input end of a
> > > transmission line.
> >
> > Actually it does, to the power reflected from a
> mismatch.
> > And in the real world, there is ALWAYS reflected
> power,
> > no matter how minute.
> >
> > 73 de Neil ZL1ANM
> >
> >
> > ------------------------------
> >
> > Message: 3
> > Date: Wed, 24 Oct 2012 23:38:11 -0400
> > From: "Mike Feher" <n4fs at eozinc.com>
> > Subject: Re: [ARC5] Why an UNUN?
> > To: "'arc5'" <arc5 at mailman.qth.net>
> > Message-ID:
> <[email protected]>
> > Content-Type: text/plain;   
>    charset="us-ascii"
> >
> > About 25 or more years ago I bought a mint WS-19 at the
> Vienna hamfest. I
> > just had to put it on the air. Read up on it and I
> figured I at a minimum
> > needed a 1to 4 matching transformer. So, I built one. A
> simple coaxial on a
> > toroid and placed it in a small box. Right away I was
> able to load up my
> > WS-19 and worked all over the place with it. Never used
> a series capacitor.
> > When I got a BC-474A, I also used it with it with
> amazing results. Again,
> > no
> > capacitor. Then came a brand new TCS, and, same
> results. In my opinion it
> > is
> > the simplest, no mod, remedy to get a rig designed for
> a short antenna on
> > the air.
> >
> > Mike B. Feher, N4FS
> > 89 Arnold Blvd.
> > Howell, NJ, 07731
> > 732-886-5960
> >
> >
> >
> >
> > ------------------------------
> >
> > Message: 4
> > Date: Wed, 24 Oct 2012 21:51:50 -0700 (PDT)
> > From: "J. Forster" <jfor at quikus.com>
> > Subject: Re: [ARC5] Why an UNUN?
> > To: "mac" <w7qho at aol.com>
> > Cc: ARC-5 List <arc5 at mailman.qth.net>,
> Mike Hanz
> >         <aaf-radio-1 at aafradio.org>
> > Message-ID:
> >         <1154.12.6.201.149.1351140710.squirrel at popaccts.quikus.com>
> > Content-Type: text/plain;charset=iso-8859-1
> >
> > >
> > >
> > >
> > >
> > >
> > > On Oct 24, 2012, at 6:45 PM, J. Forster wrote:
> > >
> > >>
> > >> Not really.
> > >
> > >
> > > Yes really
> > >
> > >
> > >>
> > >> A transmitter, like a battery or other power
> supply, can be modelled
> > >> as a
> > >> Thevinin Equivalenrt, an ideal Voltage Source
> in series with an Output
> > >> Impedance.
> > >
> > >
> > > The equivalent circuit of a class C amplifier
> would look like an AC
> > > (RF) voltage source with a very low internal
> resistance.
> > >
> > >
> > >
> > >>
> > >> There is a circuit theory theorem that, for
> maximum real power
> > >> tranfer,
> > >> the load impedance should be equal to Complex
> Conjugate of the source
> > >> impedance.
> > >
> > > We're not talking about maximum power transfer
> here.  A Class C amp is
> > > designed to provide a particular power output at a
> high efficiency,
> > > not maximum power transfer which results in an
> efficiency of 50% .
> > > You''re thinking of class A.
> >
> > The class of the amplifies has nothing to do with the
> conditions for
> > maximum power transfer fron the transmitter tank to the
> antenna.
> >
> > -John
> >
> > ====================
> >
> > > This means equal to, if the source and load are
> purely resistive.
> > >
> > >>
> > >> This means if one is inductive, the other must
> be capacitive, and the
> > >
> > >
> > > We keep the load resistance seen by the PA tube
> purely resistive here
> > > with our resonant tank
> circuit.   In practice we strive to present
> the
> > > amplifier with a purely resistive load if
> possible. Small values of
> > > reactance reflected into the tank circuit can be
> accommodated by
> > > tuning adjustments.  In those cases where the
> reactive components are
> > > too large external antenna 'tuners" are employed.
> > >
> > >
> > >> inductive reactance equals the capacitive
> reactance.
> > >>
> > >> This means if the source is complex (resistive
> + inductive), the
> > >> load must
> > >> have a load where the resistive componants are
> equal and the
> > >> capacitive
> > >> reactance is equal, and opposite, to the
> source inductive reactance.
> > >>
> > >> ie:  The L & C are resonant at the
> operating frequency.
> > >
> > > See above
> > >
> > > Dennis D.  W7QHO
> > > Glendale, CA
> > >
> > >
> >
> >
> >
> >
> > ------------------------------
> >
> > _______________________________________________
> > ARC5 mailing list
> > ARC5 at mailman.qth.net
> > http://mailman.qth.net/mailman/listinfo/arc5
> >
> >
> > End of ARC5 Digest, Vol 105, Issue 155
> > **************************************
> >
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