[Lowfer] Lowfer KE

Sun Nov 22 11:42:40 EST 2020

Kasey,

Yes, it's like 9 inches.  I agree that will be the most important thing you
do for getting your antenna to radiate. And, these changes you made
yesterday and today should get your transistors to stop failing.

Regards,
John Hamer
Lowfer JH

On Sun, Nov 22, 2020, 11:02 AM KA4SEY <ka4sey at gmail.com> wrote:

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