[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,KaseySent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------From: John Hamer <wilbur0611 at gmail.com> Date: 11/23/20  1:19 PM  (GMT-05:00) To: "Discussion of the Lowfer (US, European, & UK) and MedFer bands" <lowfer at mailman.qth.net> Subject: Re: [Lowfer] Beacon Schematic Kasey,What about something like this? I simplified the oscillator configuration.You could use the capacitors Jay offered to send you. I removed the lowpass filter so you won't have to deal with impedance matching on yourloading coil.I'm sure this is where your failed components are coming from. I'm sure youwont 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 impedanceof 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 canadjust your voltage without needing an adjustable power supply. I added the5v regulator that was missing from the schematic. I added an optional voltmeter. You can just use your handheld meter here instead. But, it showswhere to measure your voltage since you need that along with the current todetermine your power to the final.It's missing the Keyer IC, but you can just use your other schematic forthat and connect it the same way.This transmitter and antenna configuration is much easier to set up andtune than the one you have and I used to have.Regards,John HamerLowfer 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> smartphone______________________________________________________________> Lowfer mailing list> Home: http://mailman.qth.net/mailman/listinfo/lowfer> Help: http://mailman.qth.net/mmfaq.htm> Post: mailto:Lowfer at mailman.qth.net> Post must be less than 50KB total for message plus attachment!>> This list hosted by: http://www.qsl.net> Please help support this email list: http://www.qsl.net/donate.html