jump to navigation

Dr. Harold Rosen, Monday, 5-14-12 May 15, 2012

Posted by The Space Show in Uncategorized.
Tags: , , , , , , , , , , , , , , , , , , , , , ,

Dr. Harold Rosen, Monday, 5-14-12


Guest:  Dr. Harold Rosen.  Topics:  SYNCOM Geostationary Satellite history.  You are invited to comment, ask questions, and discuss the Space Show program/guest(s) on the Space Show blog, https://thespaceshow.wordpress.com. Comments, questions, and any discussion must be relevant and applicable to Space Show programming. Transcripts of Space Show programs are not permitted without prior written consent from The Space Show (even if for personal use) & are a violation of the Space Show copyright.   We welcomed Dr. Harold Rosen to the program to discuss the world’s first geostationary communication satellite which he created, SYNCOM.  Dr. Rosen has given me permission to upload to The Space Show blog Chapter 2 from Success Stories In Satellite Systems which is an AIAA book published in 2008.  Chapter 2 is titled “SYNCOM: World’s First Geostationary Satellite.”  This is Dr. Rosen’s own story of SYNCOM from idea conception to success as he is recognized as the father of the geostationary satellite.  Dr. Rosen started our discussion by going back in time to the conditions and the political situation of the time.  Sputnik was orbiting Earth and the advanced radar unit Dr. Rosen was working on was suddenly cancelled when it was discovered that the Soviet Union was replacing its bombers with ICBMs.  Dr. Rosen’s department at Hughes was now challenged to find new and appropriate technologies building upon the radar technology as it was important to keep the team employed.  One project suggested was the design and development of a communications satellite system as existing communications were problematic at best, expensive, and transoceanic television was impossible.  Dr. Rosen tells us how he expanded the idea, put together an amazing team to develop the concept, and how his team had to struggle and fight for sponsors, funding, and backing.  One of the issues we talked about was the spin configuration and thruster development.  Dr. Rosen talked about the rocket limitations at the time and how they planned on using a Scout sounding rocket.  As it turned out, the Delta was being worked on and when the satellites were ready for launch, a Delta was used.  In fact, once they knew that the launch would be on a Delta, they did some redesign of their satellite to add in more redundancy given the Delta could handle significantly more mass than a Scout.  Dr. Rosen talked about many of the challenges including the need to have a light weight traveling wave tube amplifier.  We also talked about the competing LEO comsat programs proposed at the time and Dr. Rosen had
some interesting things to say about these types of systems, especially for today with modern technology.  I asked Dr. Rosen why the early SYNCOM system had a five year life.  Don’t miss his explanation for this.  A listener asked him to compare the early geo satellites to a Direct TV satellite of today.  Again, you will find the comparison most interesting.  This is an important part of our space history and Dr. Rosen with the team he assembled made it happen, from idea to reality.  Our communications and world were forever changed because of his success.

Please post your comments/questions on The Space Show blog.  I will be sure to let Dr. Rosen know about blog comments.

Here is Chapter 2 by Dr. Rosen:  “SYNCOM: World’s First Geostationary Satellite.”

“SYNCOM: World’s First Geostationary Satellite.”



1. Richard Easton - May 17, 2012

I enjoyed listening to the program and reading Dr. Rosen’s chapter in Success Stories. His accomplishments are very impressive. I’m writing a narrative history of GPS and am interested in learning more about Don Williams’s navigational proposal. I would appreciate more information about the proposal and, if possible, contact information for Mr. Williams. Many thanks for your help.

Deborah Castleman - May 26, 2012

Hi Richard,
Don Williams passed away long ago (suicide), so there is no contact information for him, sorry. Please send me an e-mail at deborahcastleman@gmail.com and I will see if there is any information in Dr. Rosen’s files that I can get for you. Good luck on your narrative history of GPS — it sounds like a great project.
Deborah Castleman

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

%d bloggers like this: