Converting PowerPoints 22"x22" to PDF

Question

For the obvious reasons, small file size and universal transportability, we're trying to document our products with .pdf files.  Understandably, the simplifications neccessary for these benefits may come with some restrictions.
New drawing generation packages output directly into .pdf format.  Because of the intricate nature of the drawing content, the standard drawing size has already been decided on as 22" x 34"- a standard D size drawing.
Old drawings from old drawing generation packages (already 22" by 34") have been scanned (.tif format), and can be converted to .pdf format.  This is the largest size that can be scanned on a 22" scanner, and the files come in as portrait format.
In an attempt to edit the scanned drawings I read a 22"x34" portrait .tif into my Microsoft Powerpoint package.  I have the ability to set the Powerpoint document "page size" to either a 34" wide, 22" high landscape document, or a 22" wide, 34" high portrait document.  Unfortunately, when I invoke the Adobe PDF conversion tool, regardless of the condition of a myriad of settings, or whether in the portrait or landscape mode, the image is either reduced or cropped to a  maximum length of 22" .
According to Adobe tech notes 328610 and 328620, page size may not be retained with the standard source application-located Adobe PDF converter.  It was recommended that I create a virtual printer loaded with the universal PostScript printer driver, and first print the Powerpoint document to a Postscript file (.prn, or .ps), and then convert to .psd with the Adobe tool.  Unfortunately, regardless of the condition of a myriad of settings, or whether in the portrait or landscape mode, the image is either reduced or cropped to a  maximum length of 22" (the width of standard office printers).
I can take the original 22" wide, 34" high portrait .tif image, rotate it in Microsoft's Picture Viewer, edit it in Microsoft's Paint and then print the file to the virtual printer with the PostScript printer driver and create a .prn or .ps file, which when opened with the Adobe tool makes a perfect 34"wide, 22" high PDF file.
Is there any way  to take advantage of Powerpoint's vast editing ability and the Adobe PDF conversion tools with drawings greater than 22" by 22"?

Answer 1

Thanks for responding Bill.  Setting page size in the Adobe PDF virtual printer is the point of the Adobe tech notes 328610, and 328620.  Unfortunately, this isn't working for me above 22" by 22".  Si if you want to try this yourself, create a simply drawing, say a rectangle in PowerPoint, but first set the PowerPoint page size to 22" by 22" in File/Page Setup/Custom.  Print to a PostScript file and convert to PDF.  See if you get the whole rectangle, and check the size of the PDF in properties.  Then make the Powerpoint page and rectangle larger in one direction and do the same thing.  I'm afraid the image will now be cropped or distorted.