[Lowfer] Lowfer KE

[John Hamer]

Kasey,

That sounds good.  You are going to need the 24v to get 1 watt with that
configuration. I think it will work better for you.  It made a big
difference for me.

 The new computer is working well.  I have been going through windows
updates for hours because it has been off for years,  but it's almost
there.

Regards
John Hamer
Lowfer JH


On 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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