 (Reflecting this change, the Commerce Department's June 1921 amateur station call book entry for 9JE lists its new location as Denver, operated by the Reynolds Radio Specialty Co.)

After moving to Denver, Reynolds joined with other radio enthusiasts in making a number of "mobile" demonstrations, where radio-receiver equipped automobiles picked up special programs.He participated in the May 19, 1921 broadcast of the opera "Martha" from the Denver Municipal Auditorium.In the summer of 1921, Reynolds was issued a "Special Amateur" license, with the call sign 9ZAF.