(for some reason I can't embed my photos, so I have to use old-fashioned links)
After several frustrating attempts to get a Li'l 7 AM transmitter to work, I decided to try something else. After reading Jay Allen's (radiojayallen.com) description of the product, I bought the SStran AMT3000. I'd never worked with a circuit board, and it was rough going at first...
https://picasaweb.google.com/lh/phot...eat=directlink
...but I managed to finish the build in two days...
https://picasaweb.google.com/lh/phot...eat=directlink
...and, son-of-a-gun, it works beautifully. Good reception throughout the house, and now I know there's always something good to listen to on 1530 AM radio. And now, when the grandchildren visit this summer, we can enjoy an authentic experience listening to old-time radio shows.
The name "Wayback Machine" refers to Sherman and Mr. Peabody on Rocky and Bullwinkle, a favorite TV show from my youth.
https://picasaweb.google.com/lh/phot...eat=directlink
With the experience of building this transmitter and with all the suggestions above in this thread, I'm going back to the Li'l 7 once again.