[Lowfer] Beacon Schematic

[KA4SEY]

John,

That looks really good thank you, I may make a parts list today and buy
some replacement chips for the 1st transmitter. This looks like it would
work good. Hopefully this will be an improvement since I know what im doing
now. The keyer schematic will be easy to add in so I may build that on a
separate board and add it in to keep it isolated. I will have to play
around with the new coil configuration and see how it improves. I know when
I tried the transmitter a few days ago I stuck a milk crate under the tub
and a big improvement in output power. Anyways this will help me a lot.

Thanks,

Kasey


On Mon, Nov 23, 2020, 1:19 PM John Hamer <wilbur0611 at gmail.com> wrote:

> Kasey,
> What about something like this? I simplified the oscillator configuration.
> You could use the capacitors Jay offered to send you. I removed the low
> pass filter so you won't have to deal with impedance matching on your
> loading coil.
>
> I'm sure this is where your failed components are coming from. I'm sure you
> wont have issues with interference from your transmitter on other devices,
> but if you do, you could add a low pass filter later that is the impedance
> of your antenna instead of 50 ohms. I wouldn't worry about that now though.
>
> I added an LM317 adjustable regulator to the input to the final so you can
> adjust your voltage without needing an adjustable power supply. I added the
> 5v regulator that was missing from the schematic. I added an optional volt
> meter. You can just use your handheld meter here instead. But, it shows
> where to measure your voltage since you need that along with the current to
> determine your power to the final.
>
> It's missing the Keyer IC, but you can just use your other schematic for
> that and connect it the same way.
>
> This transmitter and antenna configuration is much easier to set up and
> tune than the one you have and I used to have.
>
> Regards,
> John Hamer
> Lowfer JH
>
> [image: simpltx_mod.gif]
>
> On Mon, Nov 23, 2020 at 8:48 AM KA4SEY <ka4sey at gmail.com> wrote:
>
> > Down below I put a different schematic of a Lowfer transmitter. Hopefully
> > that one will be better than the one I followed. Please let me know.Sent
> > from my Verizon, Samsung Galaxy
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