[Lowfer] Lowfer KE

Sun Nov 22 10:15:58 EST 2020

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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