[Lowfer] Lowfer KE

KA4SEY ka4sey at gmail.com
Sun Nov 22 10:52:25 EST 2020 

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
> >
> > > >>> > >> >>
> >
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