[Milsurplus] AN/APR-4 and SPA-1

[J Forster]

Has anyone played with the combination of the AN/APR-4 Sweeping
Receiver  and the SPA-1 Radar Pulse Analyzer ? It seems like an
interesting combination of a pulse rate meter and scope.

It should clearly see something like the ASB series radars and the
AN/APN-2 Rebecca, but will it also see things like the AN/APN-1 Radio
Altimeter?

Does anyone have any doc on the SPA-1 ? The internet seems to be largely
silent about it, except for a pic here:
http://www.maritime.org/radio-rcm.htm

Thanks,
-John