LULU Modulation article posted in 30 Below

[Stretchyman]

Nearly there.....

12V @ 0A7 is ONLY 8W4 I/P so should give 6-7W with reasonable efficiency.

To Measure power correctly use (Peak to Peak X 0.35)Squared/50. So (40x0.35)sqr/50=4W.

You want around 70V (12W) with 13V8.

I'd keep tweaking.

The IRF wont work with ONLY 8V on the gate but the IRL will.

Tune past the best looking waveform till the baseline starts to rise, you'll get way more power whilst sacrificing some efficiency.

Just squeeze and stretch the turns on the O/P toroid to get max power. Leave off the LPF while you do this, can be attached later and it shouldn't change the O/P much...

Str.

p.s. Check my schematic in the ; 'A newbie question about a transmitter' post

sub a 1nF cap for the 1n5 and remove the LPF. So the RF goes thru the 0u1, 7T L, across 1nF to load, simple as..

[CoolAM Radio]

CoolAMRadio - Google-Drive # Special Information folder
Transmitters/Antennas/Datasheets/Service Manuals- & many more interesting items!

https://drive.google.com/drive/folders/1Ut2VGzfKbNttZePKZhX83wg23p7zfq3v?usp=sharing


André
CoolAM Radio - Shortwave
the Netherlands

[Stretchyman]

Just more old stuff gleaned from th' net.

There's nothing new there at all.

Infact the newest thing there's the FAT5 PA which is actually ok if 10 years old.

Please will folk stop posting this stuff, we've all seen it all before.

MOAN...

Sorry...

 

Str.

[CoolAM Radio]

No problem, but there are always interested people!

And, btw, who are you to tell me not to post these items?
Seems to me, you're posting lots of postings trying to sell
your transmitters!

lol!
no hard feelings!

André
CoolAM Radio

[Stretchyman]

How TRUE!


However Please show us something we haven't seen.

I see no point in posting circuits that cant be built.


Str.