View Single Post
  #70   Report Post  
Old June 15th 10, 01:27 AM posted to rec.radio.amateur.antenna
Richard Clark Richard Clark is offline
external usenet poster
 
First recorded activity by RadioBanter: Jul 2006
Posts: 2,951
Default what happens to reflected energy ?

On Mon, 14 Jun 2010 12:32:02 -0700 (PDT), Wimpie
wrote:

Before I am going to spend lots into time this, some points:

1. Do you accept the "measuring" method with injecting a signal with
slight frequency difference as mentioned in the document?


Hi Wim,

I got only a hint of what you were trying to do because it was buried
in so much conflicting agendas.

However, my first impression was that it looked worth discussing. My
second impression was that it was not needed. Still, that is worth
discussing too.

2. Do you accept the way of presentation (envelope change versus time
and converted to output VSWR as used in the document)?


I hadn't the slightest idea what that was all about. Like I said, too
many things going on. From your email, it sounds like too much
complexity to accomplish what was done with meter indications.

For others, this might be found in the section called "Output Tuning"
in:
"Fine Tuning FM Final Stages," by Mendenhall (google for a link or
email me for a copy).

3. Do you accept B^2 spice A/D professional, version for as suitable
platform?


I have no problem with what you are comfortable with. I am sure a
suitable simulation will evolve.

If we cannot agree on this, it is of no use to continue.

I limit the simulation to low HF frequencies as based on a circuit
diagram alone we cannot guess the parasitics for high HF/VHF use and
this may be food for more discussion. Please also mention what
components you want into the simulation as simulating a full TS830
will take to long.

All relevant info will be made available to the group, inclusive
original circuit diagrams and the diagrams I used for simulation. I
hope that I can get a suitable simulation model for the tubes.

Regarding circuit diagrams, can you reduce the color depth (gray scale
or B/W) and convert them to PNG as this is non-lossy coding.

I am looking forward to the results.


We will resolve the details offline. I would encourage you to save
effort (we both have things to do) by doing a "quick and dirty" first
pass just to see how little we may have left to do (it could be that
simple). There is more to read than there is to simulate.

For others, the material I have linked Wim to probably tips the
download scale at 50MB. 44 MB is one document alone that others here
might find useful:
"EIMAC Care and Feeding of Power Grid Tubes" 44MB at:
http://www.g8wrb.org/data/Eimac/care...grid_tubes.pdf

It will brush away the cobwebs.

73's
Richard Clark, KB7QHC