[Lowfer] Lowfer KE

Sun Nov 22 11:01:25 EST 2020

Ok just making sure, I really think my biggest improvement will be adding a
variometer. That should really improve things. From looking those pictures
of your setup it looks like you have the 8 inch piece of cardboard tube
mounted in the middle of the 12 inch coil. I think I'm correct.

Kasey

On Sun, Nov 22, 2020, 10:58 AM John Hamer <wilbur0611 at gmail.com> wrote:

> Kasey,
>
> Nope,  it's ok to leave it open.
>
> Regards,
> John Hamer
> Lowfer JH
>
> On Sun, Nov 22, 2020, 10:53 AM KA4SEY <ka4sey at gmail.com> wrote:
>
> > Ok sounds good, I wasnt sure if leaving the coil open on one side would
> > effect anything. I will try it and hopefully I can achieve the max power.
> >
> > Kasey
> >
> > On Sun, Nov 22, 2020, 10:49 AM John Hamer <wilbur0611 at gmail.com> wrote:
> >
> > > Kasey,
> > >
> > > You don't do anything with them.  You will only have 2 connections to
> > your
> > > coil.  The transmitters output will be at one end,  and the antenna
> will
> > be
> > > on the tap that gives you the most current near the other end. All the
> > > other taps are just left open.  After you find the tap that gives you
> the
> > > most current, connect your 24v and make sure you are not exceeding the
> > > 1watt allowance. You should be pretty close to 1 watt. If it's too
> high,
> > > we can come up with a way for you to adjust the voltage down a little.
> > >
> > > Regards,
> > > John Hamer
> > > Lowfer JH
> > >
> > > On Sun, Nov 22, 2020, 10:33 AM KA4SEY <ka4sey at gmail.com> wrote:
> > >
> > > > Ok that's good to know. Hopefully I will get to do that later. I
> forgot
> > > > about that too, when you take the antenna to different taps, what do
> > you
> > > do
> > > > with the antenna output wire and the end of the coil?KaseySent from
> my
> > > > Verizon, Samsung Galaxy smartphone
> > > > -------- Original message --------From: John Hamer <
> > wilbur0611 at gmail.com
> > > >
> > > > Date: 11/22/20  10:20 AM  (GMT-05:00) To: "Discussion of the Lowfer
> > (US,
> > > > European, & UK) and MedFer bands" <lowfer at mailman.qth.net> Subject:
> > Re:
> > > > [Lowfer] Lowfer KE Kasey,Ohh, yeah,  you don't need to tre the 24v
> > until
> > > > you get the newconfiguration.Regards,John HamerLowfer JHOn Sun, Nov
> 22,
> > > > 2020, 10:17 AM KA4SEY <ka4sey at gmail.com> wrote:> No the original
> > > setup.>>
> > > > On Sun, Nov 22, 2020, 10:13 AM John Hamer <wilbur0611 at gmail.com>
> > > wrote:>>
> > > > > Kasey,> >> > Are you using the new loading coil configuration?> >>
> >
> > > > Regards,> > John Hamer> > Lowfer JH> >> > On Sun, Nov 22, 2020, 10:07
> > AM
> > > > KA4SEY <ka4sey at gmail.com> wrote:> >> > > John,Glad you could get it
> > > > going, I'm messing around with 13.8 and 24> > > volts and 13.8 seem s
> > to
> > > > work better? Now sure why but on 24 it draws> > 20ma> > > and on 13.8
> > it
> > > > draws 40ma. At 13.8 it also has a stronger signal here> at> > > the
> > > house.
> > > > Not sure if that's overloading it or what.KaseySent from my> > >
> > Verizon,
> > > > Samsung Galaxy smartphone> > > -------- Original message
> --------From:
> > > John
> > > > Hamer <> wilbur0611 at gmail.com> > >> > > Date: 11/22/20  9:53 AM
> > > > (GMT-05:00) To: "Discussion of the Lowfer (US,> > > European, & UK)
> and
> > > > MedFer bands" <lowfer at mailman.qth.net> Subject:> Re:> > > [Lowfer]
> > > Lowfer
> > > > KE Kasey,That sounds good.  You are going to need the> 24v> > > to
> get
> > 1
> > > > watt with thatconfiguration. I think it will work better for> > you.>
> > > >
> > > > It made a bigdifference for me. The new computer is working well.  I>
> > > have>
> > > > > > been going through windowsupdates for hours because it has been
> off
> > > > for> > > years,  but it's almostthere.RegardsJohn HamerLowfer JHOn
> Sun,
> > > Nov
> > > > 22,> > > 2020, 9:48 AM KA4SEY <ka4sey at gmail.com> wrote:> Hey John,
> how
> > > is
> > > > your> > > computer setup doing? I meant to tell you, I took> the LPF
> > out
> > > > and both> > > transistor are doing good. I put a 10W 50 ohm resistor>
> > > from
> > > > the output> > to> > > ground and supplied 24v to the circuit and got
> > 75ma
> > > > to> the finals. It> > was> > > putting out a whopping 1.8 watts! The
> > > > resistor even got> got. I'm> > excited!> > > Now with it out of line
> > and
> > > > back at the antenna it's on a> 13.8v power> > > supply with the same
> > > > configuration and I was getting 35ma to> the> > finals. I> > >
> believe
> > > > that's about 450mw. But looking at the signal here on> the> radio> >
> >
> > > it's
> > > > much stronger. I even picked the tub up and sat a milk crate>>
> under> >
> > > it>
> > > > > > and now it's a strong 20 over. So both of those helped. I will
> try>
> > > > the> > > configuration you told me to try today and see how that
> goes.
> > I
> > > > might>> > try> > > the thing on 24 volts and see if the signal
> > > > increases.KaseySent from> my>> > > Verizon, Samsung Galaxy
> smartphone>
> > > > -------- Original message> > --------From:> > > John Hamer <
> > > > wilbur0611 at gmail.com>> Date: 11/22/20  9:38 AM> (GMT-05:00)> > > To:
> > > > "Discussion of the Lowfer (US,> European, & UK) and MedFer bands" <>
> >
> > >
> > > > lowfer at mailman.qth.net> Subject: Re:> [Lowfer] Lowfer KE I Believe
> > he> >
> > > > has> > > the capacitors on the oscillator and> they are just not
> onthe
> > > > schematic> > he> > > posted.  I went through datasheet with> him over
> > the
> > > > summerand> calculated> > > the proper capacitor values.RegardsJohn>
> > > > HamerLowfer JHOn Sun, Nov 22,> > > 2020, 9:28 AM KA4SEY <
> > > ka4sey at gmail.com>>
> > > > wrote:> Thank you John, I> will> > > add those capacitors on in the
> > > future
> > > > and> make any> other changes.> Like> > I> > > said I'm going to try
> > > another
> > > > configuration> with the> coil today to> see> > if> > > it will do any
> > > > better. I will hopefully find> an> ammeter which would> > help> > >
> me
> > a
> > > > lot. Thanks againKaseySent from my> Verizon,> Samsung Galaxy> > >
> > > > smartphone> -------- Original message> --------From: J D <> > >
> > > > listread at lwca.org> Date:> 11/22/20  2:27 AM> (GMT-05:00) To:> > >
> > > > lowfer at mailman.qth.net Subject: Re:> [Lowfer] Lowfer KE> Kasey, it>
> > > > would> > > appear from your schematic that a few> components may be>
> > > > missing,> > thereby> > > preventing your oscillator from being as>
> > stable
> > > > as it> needs to be.> This> > > same situation is found in a
> > commercially>
> > > > made sorta-kit> rig for 22> > > meters, and beacons using it there
> can
> > > > often be> identified by> their> > > tendency to wander or even
> outright
> > > > jump around in> frequency from> day> > to> > > day.A Pierce
> oscillator
> > > > needs capacitance from both> legs of the>> crystal> > > to ground as
> > part
> > > > of a phase shift network. There is> stray>> capacitance> > > present,
> > of
> > > > course, without which it would not oscillate> at> all; but> > that>
> > >
> > > is
> > > > neither of sufficient magnitude nor stability to ensure>> reliable>
> > >
> > > > oscillation at the design frequency of the crystal. A good>>
> starting>
> > >
> > > > value> > > for capacitors for a typical 3 MHz parallel resonant>
> > crystal>
> > > > would be> > 27> > > pF each.In addition, there n>  eeds to be a
> series>
> > > > resistor between> pin> > 10> > > and the crystal. It serves> three
> > > > functions that> each affect frequency> > > stability to a certain
> > > extent:>
> > > > it isolates the> crystal somewhat from> > the> > > complex impedance
> of
> > > the
> > > > gate> output, it limits> current and thereby> > power> > >
> dissipation
> > in
> > > > the crystal, and> it is part of> the phase delay> network.> > As> >
> > a
> > > > rough first approximation, I'd> suggest 1 K,> maybe as high as 2.2>
> > >
> > > > K.Finally, the shunt resistance across> the crystal> could be a
> little>
> > > > >
> > > > higher in value for 3 MHz operation, such as> 3.3 M to> 4.7 M. It's
> > not>
> > > >
> > > > > terribly critical, but it is preferable to operate> it with> as
> high
> > > a> >
> > > > > value as will allow for reliable startup. Lowering the> operating>
> Q
> > > of>
> > > > > the> > > crystal with a low parallel resistance could allow a>
> > crystal
> > > > to> jump> > too> > > easily between primary resonance and any
> > secondary>
> > > > resonance> modes it> > may> > > have.These comments are some basic
> rule
> > > of
> > > > thumb> guidance.> For more> > > detailed treatment of Pierce
> > oscillators
> > > > implemented> with logic>> gates,> > I> > > believe Crystek s>  till
> > > offers
> > > > this article:>>> > >> >>
> > > >
> > >
> >
> https://www.crystek.com/documents/appnotes/pierce-gateintroduction.pdfJohn
> > > >
> > > > > >>> > >> >>
> > > >
> > >
> >
> Davis______________________________________________________________Lowfer>>>
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