[Milsurplus] Collins 75A-4 Receiver Coverage

[Mike Morrow]

This information about the 75A-4 variants has been educational to me.
Based on all that has been presented, it appears that these different
versions of the 75A-4 covered bands as shown below:

   75A-4       Ham   USN   USAF
    MHz
 1.5 to  2.5    x     x     x
 3.2 to  4.2    x     x     x
 4.2 to  5.2          x    
 5.2 to  6.2          x
 6.8 to  7.8    x     x     x
11.0 to 12.0                x
13.0 to 14.0          x
14.0 to 15.0    x     x     x
20.5 to 21.5                x
20.8 to 21.8    x
26.5 to 27.5    x
28.0 to 29.0    x
29.0 to 30.0    x     x

Total Bands     8     8     6

I wonder why the USAF version didn't take advantage of adding a couple
of bands, or why the USN version didn't include something more useful
for military purposes than the 29 to 30 MHz coverage.

Up to now, I had thought all 75A-4 units were identical in frequency
coverage.

Though I'm not a Collins groupie outside of military aircraft radios,
I've found this discussion interesting.  That's what I like about
this list.

Mike / KK5F