Need the codes to program dishnetwork remote to work the zenith converter box

SOURCE: Trouble programming Universal Remote to a DTV Converter Box...

Not a complete solution, but, around the last page (pg. 14) of your converter box manual there are codes listed for universal remotes. I happen to have a Philips remote that is listed. My code to control my dtv box is 0354. It appears that they have all codes listed for all Radioshack model universal remotes. I would suggest getting a Radioshack remote for Your "Digital Stream" (Radioshack) dtv box...

SOURCE: converter box codes for rca universal remote rcr3273/3373 for zenith or lg boxes

if It is similar to most RCA universal remotes, to get the code follow these steps(Manual code search MAy take awhile):
1:Manualy turn on the component that u want to control
2: press and hold the component key (ie SAT while holding SAT press ON-OFF key(button) for three seconds until all of the components light up and release the keys(button).
3: keep pressing ON-OFF key until your component turns off.(Note may take awhile)
4: one the correct code is found hit the STOP key and it will save your component IF YOU DO NOT HIT THE STOP KEY THE CORRECT CODE WILL NOT BE STORED.
Hope this works

SOURCE: Universal remote codes for Philco digital to analog converter box

http://www.remotecodelist.com/remotes/

SOURCE: Problem programming Zenith Digital TV Converter DTT901 remote.

Be sure that your TV is set to channel 3 or 4 if you are using the RF cable or Video 1, etc if using the Audio/Video cable.  The Installation  Guide should appear.  The "improved" picture that you are seeing is simply the analog throughput, not the digital conversion.