[Boatanchors] Re Phasing vs Filter SSB

[JAMES HANLON]

Scott,

First off, I have a couple of fairly early phasing transmitters, an Eldico SSB-100 from 1955 and a Central Electronics 100V from 1958.  They both use the RC audio phasing network from the even earlier General Electric SSB Junior, and they both still work well, getting very good audio reports.  They have carrier balance pots, and I can adjust the carrier suppression to an extremely low value.  The Eldico lets me run upper or lower SSB, double sideband AM, and CW; while the 100V does upper and lower sideband with or without carrier, DSB (AM) with and without carrier, PM (Phase modulation), CW and RTTY.  They are fun rigs!  I also have a Heathkit SB-10 that I run with an Apache, and it's adequate but not really great.

My main reason in writing is to recommend a little reading for you.  The ARRL put out a book, Single Sideband for the Radio Amateur," 2nd edition copyright 1965, that has several homebrew transmitters of both the phasing and filter persuasions, linear amplifier info of the era, detailed instructions on how to adjust phasing exciters, and more.  And I'd particularly recommend "Cheap and Easy S.S.B." by Anthony Vitale, W2EWL, QST March, 1956, pages 16 to 20, 110, 112, and 114.  It tells how to build a 100 watt output pep phasing transmitter for 80 and 20 meters into a BC-458 Command Set transmitter.  Also, you should read THE ARTICLE that fathered all of the phasing rigs, the "SSB Jr" from General Electric Ham News, November-December 1950.  You can find it at http://n4trb.com/AmateurRadio/GE_HamNews/sideband_handbook.htm .  Click on Chapter II and it will be the first twelve pages.  There is an 8150 KHz SSB Junior built into the heart of my six hundred dollar Eldico SSB-100.  That article gives complete detail on how to build and adjust your own audio phasing network.

Enjoy!

Jim Hanlon, W8KGI
[http://n4trb.com/AmateurRadio/GE_HamNews/Sideband_Handbook/Sideband_Handbook_Cover.jpg1zB]<http://n4trb.com/AmateurRadio/GE_HamNews/sideband_handbook.htm>
Sideband Handbook - N4TRB Amateur Radio<http://n4trb.com/AmateurRadio/GE_HamNews/sideband_handbook.htm>
1961 publication from General Electric on the use of single sideband modulation for amateur radio
n4trb.com