IFF Mark I

Maury Markowitz

From the Great White North!
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There's a fair amount of information available on IFF Mark III, and a little bit on Mark II, but practically nothing on Mark I that I can find. There's a number of vague descriptions and some comparisons between the Mk I and Mk II, but they tend to be contradictory, some saying you had to manually tune Mk I while others say it swept the CH bands. Even AP1093 only mentions the Mark I in passing, stating that 50 were made - while others sources seem to say 1000 but I think they mean the Mark II.

Anyone know of a GOOD source on this topic, one that's more than a few pages long? I'd love to see something that has the actual circuits in it.
 

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