The AM Forum
March 29, 2024, 11:34:19 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
 
   Home   Help Calendar Links Staff List Gallery Login Register  
Pages: 1 ... 5 [6]   Go Down
  Print  
Author Topic: Simple Audio Driver for 833A modulator  (Read 94356 times)
0 Members and 1 Guest are viewing this topic.
K1JJ
Contributing
Member
*
Offline Offline

Posts: 8893


"Let's go kayaking, Tommy!" - Yaz


« Reply #125 on: November 16, 2005, 02:01:25 PM »

Looks like things are progressing along.  Some good additions. I don't mind lots of bells and whistles, as long as they do something worth while. Most seem logical. The neg peak limiter of the unused op amp is a great idea.

I intend on building the version that exists when I get everything else finished on the 833A X 4-1000A rig.  Maybe in a month I'll be at that point.

Right now I'm doing metalwork. Finished building the four big chassis and made a sub chassis air system  for the 4X1 as well as mounted the 833A's with small muffin fans below them to add cooling there.

Question:  Can I mount the 833A fil transformers right on top of the mod transformer without seeing audio feedback problems between the cathode and plate? I expect there will be some big EM fields there.  Or maybe the 833A's are such low mu it doesn't matter.  Room is at a premium on the mod deck with the big iron taking up 3/4's .

Also: I use two 150H @ 300 ma chokes in PARALLEL for the heising reactor. If they sit side by side, do the windings have to be phased correctly due to core EM coupling? I planned on putting the cores at right angles to one another, but still wonder about weird effects from core overlap and proper winding phase as a result, if even needed.

73,
T

Logged

Use an "AM Courtesy Filter" to limit transmit audio bandwidth  +-4.5 KHz, +-6.0 KHz or +-8.0 KHz when needed.  Easily done in DSP.

Wise Words : "I'm as old as I've ever been... and I'm as young as I'll ever be."

There's nothing like an old dog.
WA1GFZ
Member

Offline Offline

Posts: 11152



« Reply #126 on: November 16, 2005, 03:26:12 PM »

I don't think the chokes will be a problem because they are in parallel. The Fil transformer not sure. Can you put a steel plate between them?
Logged
Pages: 1 ... 5 [6]   Go Up
  Print  
 
Jump to:  

AMfone - Dedicated to Amplitude Modulation on the Amateur Radio Bands
 AMfone © 2001-2015
Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
Page created in 0.065 seconds with 18 queries.