Wayne's Class-H modulator

Welcome and feel free to ask questions about class E, mosfet's, and AM.
You must be registered to post.

Wayne's Class-H modulator

Postby Brent » Wed Mar 28, 2007 7:04 pm

I had the pleasure of visiting Steve QIX in Townsend, Ma and WA1SSY Wayne had brought his modulator over for debugging. I was impressed by the beautiful job Wayne did on the modulator and can't wait to see the RF deck when its completed. Steve did have a post on the AMForum, but it must have been pulled or redirected?

Also a big thanks to Steve for his help. The modulator driver had the ground for the charge-pump going to the floating board instead of the chassis and was the route of the problems for the past 2 years. It was amazing that the rig ran at all?!

I decided to put Steve's PDM generator board in the rig and remove the old deag-bug PDM board that I built 2 years ago. I had dragged the whole modulator chassis over to Steve's to debug and found a 22pf cap instead of a 220pf on the new board....he was surprised to see the clock frequency running at 1.5 megahertz. HA!

So after repairing the RF deck and tweaking the modulator, the big rig is back and better than new.

Stayed tuned for the newr design by QIX labs.

Brent W1IA
Brent
PT Cruiser Tina
 
Posts: 110
Joined: Sun Feb 02, 2003 11:21 pm
Location: Derry, NH

Postby frank carcia » Wed Mar 28, 2007 8:19 pm

Man that heat sink Wayne used looks like it would support a 1 KW rig.
What a nice job!
frank carcia
Senior Contributer
 
Posts: 765
Joined: Fri Jan 31, 2003 10:48 am
Location: Enfield Ct. / Niantic Ct.

SSJ Pics

Postby nu2b » Thu Mar 29, 2007 12:24 pm

Waynes pictures are in "QSO" Mar 27

http://amfone.net/Amforum/index.php?topic=10710.0

This is really a nice job.
Looks like it might be built on a TechMar chassis.

Regards,
BobbyT
BobbyT
nu2b
Member
 
Posts: 29
Joined: Mon Feb 02, 2004 12:31 pm

Postby steve_qix » Fri Mar 30, 2007 7:53 pm

Here's the actual post I put up on AMfone :-)

Wayne, WA1SSJ brought his new modulator - power supply down to my place to check out and fire up for the first time !

I was really impressed by the incredible construction job and attention to detail. Almost "military like" in the number of screws, labeled wires, tiered levels, etc. And, it worked and sounded every bit as good as it looked.

This power supply / modulator is designed to work with transmitters up to 500 watts carrier, and will modulate the carrier up to 200% positive ! The underlying topology is class H (analog).

Notice the stamped front panel with inlaid lettering. Nice job !

Here's the front panel:
Image

Here's the inside:
Image

Here is a closeup of one of the PC boards:
Image

Here's a closeup of one of the meters:
Image
Visit the class E web site at:

http://www.classeradio.com
User avatar
steve_qix
Class E Guru
 
Posts: 434
Joined: Fri Jan 31, 2003 11:03 am
Location: Townsend MA


Return to Class E Discussion

Who is online

Users browsing this forum: No registered users and 1 guest

cron