[Lowfer] Lowfer KE

Sun Nov 22 10:17:59 EST 2020

Kasey,

My antenna draws around 45ma at 22v. I don't know what your antenna does,
but higher voltage should give you higher current. Do you have a way to
adjust the voltage between 13 and 24 so you can see at what point it drops?

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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