One Last FM Exciter.

[Krakatoa]

Beautiful nice board there. If you plan on using the MRF4427, I propose to put it on the solder side of the PCB and to improve heatsinking, place a lot of vias around the transistor to connect it to a gnd plane on top layer, with space for an adhesive heatsink (like the ones that some equipment attach on top of some hot running IC's).

[Zozo]

Thank you Krakatoa, and for the tips with the MRF4427. I think I've got to a stage where I can order the first sample PCB's. It'll probably need some rework, but at least I'll have something to work with for the practical experimenting process.

[radium98]

thank you @Zozo i wish will this art of beauty have an lcd later

"Proper Pirates" don't have LCD frequency displays on rigs....

Yes I agree Tech, as most pirates don't really regard that as a must have feature. But I can understand that some people do.

sorry i dont know this before , thanks you .but for a professionel look only .some esthetiques.

[radium98]

what about a digital swr power meter that can fit alone with any exciter and control it via pwm etc ....for protection issue ,swr alarm , temp ,power up and down and finally excursion deviation meter .But alone and PIc microcontroller ?

[Zozo]

what about a digital swr power meter that can fit alone with any exciter and control it via pwm etc ....for protection issue ,swr alarm , temp ,power up and down and finally excursion deviation meter .But alone and PIc microcontroller ?

Yes I know what your thinking. That could easily be done on a sub board as a companion to the exciter. There would need to be a control line sent back to the exciter for adjusting the power, which would just vary the supple voltage to the pen stage driver. That could also be useful for high S.W.R. switch off.

For the buttons used to change and confirm the frequency, there would need to be new software written.

[teckniqs]

I think it's a shame this is going to be the "One Last FM Exciter" you will design as I thought it was quite an interesting project.

[Zozo]

I think it's a shame this is going to be the "One Last FM Exciter" you will design as I thought it was quite an interesting project.

Thanks Tech. It's been a fun project I must admit.

It's had it's "Up's" and "Down's" along the way. But It does work well, and should have all the features most pirates would need for a "Tower Block Rig" installation. There is still the MK3, which is basically the same board but with the more obtainable MRF4427

There's something else in the pipe line which is more for the QRP guys, and will be a nice companion for the Exciter. Mostly because it will just match in looks and branded.

Sneak Preview. (Nothing set in stone with the design)

Amp.JPG

[MiXiN]

I think it's a shame this is going to be the "One Last FM Exciter" you will design as I thought it was quite an interesting project.

+1

This thread is a good read, and the work is impressive.

Well done, Zozo & co

[Zozo]

I think it's a shame this is going to be the "One Last FM Exciter" you will design as I thought it was quite an interesting project.

+1

This thread is a good read, and the work is impressive.

Well done, Zozo & co

Thanks MiXiN, When you look back to page one of this thread to where it all started, and to where it's ended up. It's defiantly come on along way.

[radium98]

what about a digital swr power meter that can fit alone with any exciter and control it via pwm etc ....for protection issue ,swr alarm , temp ,power up and down and finally excursion deviation meter .But alone and PIc microcontroller ?

Yes I know what your thinking. That could easily be done on a sub board as a companion to the exciter. There would need to be a control line sent back to the exciter for adjusting the power, which would just vary the supple voltage to the pen stage driver. That could also be useful for high S.W.R. switch off.

For the buttons used to change and confirm the frequency, there would need to be new software written.

awasome as a standalone project what i dream in with pic16f876a , i have a similar pcb what on it are erased but i know them i can help for what inside Zozo and al l will benefit from , no arduino or excotics parts
happy easter to all and thanks

[Zozo]

[UPDATE]

After much thought I've decided to abandon the original idea for the MK3, that would have used the surface mount MRF4427 device. There's still plenty of 2n4427 available for the time being, especially those that where manufactured by Philips and ST.

Sorry if this had disappointed anyone waiting for the newer version to be posted, but I would like to get started on other projects that are in the pipe-line.

However I did make one or two last changes to the MK2, which I think have made improvements. Firstly I changed the orientation of the DC Choke inductor to the final stage, with increased through-hole pitch. This should make it easier in install, plus it looks neater.

Finally the exposed ground plane around the outer edge of the PCB, which will now make things easier for the ground / braid on both AF/RF connections. Before as some of you know, I was suppling the tag washers for the same purpose with the PCB's.

The Source Files will be posted as always, and like before there will be a limited amount of PCB's available for sale soon.

[Zozo]

Source Files Below

ZoZo-PLL-MK3.zip

[radium98]

Thank you .

[Zozo]

[UPDATE]

The new PCB's arrived this morning, first impressions they look really good. I'll most likely build one up over the weekend.

20210507_100028.jpg

[mpx]

Nice! Might be interested in a few of these

[Zozo]

Thanks MPX, I think I've got to a design that's truly finalized.

[MiXiN]

They look great, Zozo.

Particularly like the common ground around the outer edge.

I'd definitely be interested in buying 1 or 2 of those if you want to sell with programmed PICS.

[Zozo]

Thanks MiXiN, I'll get one assembled over the weekend and then start preparing them for shipping. There's only 25 units, but I have a list of reserved pre-orders which includes now 2 for you. I'll contact everyone via PM over the weekend to confirm orders / quantities etc.

[MiXiN]

Cheers Zozo, you're a star.

[RF-Head]

Found a picture of my old driverboard of 2001
Looks almost the same
If have not been on the same school as ZOZO