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Class E Radio Revisited




 
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KF1Z
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Are FETs supposed to glow like that?


« on: December 18, 2020, 06:46:18 PM »

Ok,
Step 1 -  Get all the 3D Printer stuff off the bench to make room for radio stuff -  Check  ( almost)
Step 2 -  dig out the modulator - Check
Step 3 -  dig out the RF deck(s) - Check
Step 4 - Remember how to assemble it all ------------------

Ok, that's gonna take a bit  :-)

Looks like I'm missing a VFO..
But I think I'll use the Flexradio output...  So just need the interface between that and the RF deck
I believe I still have an unpopulated VFO/Phase splitter board that I can use.
So need to find that, and the components...

I guess this isnt going to be as quick and easy as I'd hoped.  Grin
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vk3alk
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« Reply #1 on: December 19, 2020, 08:58:11 PM »

Hi Bruce...

Doesn't sound too bad.. at least there appears to be no hardware damage etc:
Its good to have dummy loads to test PWM and stuff ....
Remember to set or check the Mark to Space ratio to give your TX headroom .....

Hopefully all springs into life.....

I know you know this anyway .....  Smiley


Wayne

 
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KF1Z
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Are FETs supposed to glow like that?


« Reply #2 on: January 11, 2021, 08:46:14 PM »

It lives!
 Grin

The PWM modulator needed some new meters.... unfortunately, I had no matching sets.....  oh well.

The Class E deck.. I stripped out all the mosfets, drivers etc...
And replaced them all , along with some transzorbs caps etc.

First QSO's last night and tonight.

Seems to be working ok fine.



* station_kf1z.jpg (705.15 KB, 1024x627 - viewed 341 times.)
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vk3alk
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« Reply #3 on: January 12, 2021, 09:20:16 PM »

Thats good Bruce.....

Sounds like you did a little work on the TX ......
How many FETs are you using again, is it 8 around the 350 watt mark .....


Wayne
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KF1Z
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Are FETs supposed to glow like that?


« Reply #4 on: January 13, 2021, 10:07:11 AM »

Wayne,

When I first built this deck, it was 12 FETs ( 2x6)

Now it is 'standard' 8 fet.

bruce
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steve_qix
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Bap!


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« Reply #5 on: January 21, 2021, 01:40:54 PM »

Although 12 FETs is good too.  600 watts (carrier) out.
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High Power, Broadcast Audio and Low Cost?  Check out the class E web site at: http://www.classeradio.org
vk3alk
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« Reply #6 on: January 21, 2021, 04:27:19 PM »

You guys are sooooo lucky been able to run decent power levels...

Actually Steve what brand model of Drone do you use to drop the fishing sinker over the trees for your antennas ?

It must be reasonably large to drop a 12 oz sinker !!!


Wayne
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