An awsome looking PS/PD Modulator by km5tz

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An awsome looking PS/PD Modulator by km5tz

Postby ke1gf » Tue Mar 09, 2004 9:12 am

Check it out, puts my rig to shame.

http://www.km5tz.netfirms.com/classe.htm

73's
-Bill KE1GF
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Postby blaine » Tue Mar 09, 2004 4:09 pm

all i can say is ....WOW :shock:

nice job.
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Postby W1DAN » Tue Mar 09, 2004 6:22 pm

Gee,

Some of the BEST construction I have seen!

Wonder what RF decks he will be using? the 10 fet push pull?

Dan
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Postby VE7KHz » Wed Mar 10, 2004 10:34 am

Now that's how stuff should be built! Nice work OM.

Could someone point a poor old boy who's been outa the loop for 6 months, to the 10 FET push pull info that is mentioned here? I STILL haven't started my Class E rig but I now have 2 weeks of eves and weekends free so I may actually get something built.

What's current state of the art in modulators and RF decks? I have Kevins Class H modulator borads and all the stuff to build the 360W QIX rig but if there is new technology and ccts out there, I would like to build the latest and greatest. Has anyone built up something cabable of 750W carrier, which is what we can run north of the border?

Cheers

Paul
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Postby ke1gf » Wed Mar 10, 2004 1:11 pm

W1DAN wrote:Gee,

Some of the BEST construction I have seen!

Wonder what RF decks he will be using? the 10 fet push pull?

Dan
W1DAN


Dan i think he's going to use the GF 20 FET quasi push-pull deck.
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Paul . . . the quasi push pull . . .

Postby k3xf » Wed Mar 10, 2004 4:16 pm

Paul,
The current state of class e is the quasi push pull where the positive and negative excursions turn on FET banks on the RF end.
The Steve/Kevin class H is a solid design that is unlikely to change much going forward. It works and sounds very nicely. PWM OTOH is more cutting edge from the ham perspective. Filter designs are still being worked out . . .
I am rebuilding my "old style" six fet 80M transmitter and converting it to a 10 Fet quasi push pull. (I think we should call them 5X5s, 10X10, etc.) The FETs I am using are 300W dissipation each . . . . (1000V, 12A) . . . this design might be pushed to 750W carrier.
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Postby VE7KHz » Wed Mar 10, 2004 5:33 pm

The current state of class e is the quasi push pull where the positive and negative excursions turn on FET banks on the RF end.


Thanks Art!

I also read that Steve QIX has built a xfmrless unit that switches right off the line. Sounds cool. I should probably just pick a comfy chair and start reading all the old posts to find out how we got here.

I have boxes of parts, heatsinks, power supplies etc. just waiting to create RF and I have 2 weeks to get something working.

Thanks all,

Paul
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Last edited by VE7KHz on Wed Mar 10, 2004 6:46 pm, edited 1 time in total.
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Postby k3xf » Wed Mar 10, 2004 6:24 pm

Paul,
Steves (QIX) site is the best reference around . . . the schematic is there as is lots of comment. . .
Art
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