[ARC5] Seeking Information: Article on the original ARC commercial Type D receiver

[James Duffey]

In the 30s, QST was considered a rigorous technical magazine. Even through the 60s most technical libraries carried it as an engineering periodical and it was often referenced in peer reviewed technical journals. - Duffey KK6MC

On Jan 2, 2015, at 7:00 PM, arc5-request at mailman.qth.net wrote:

> Frequently such articles in the less rigorous magazines have references from
> which the material is drawn.  Are there any such for this subject?