[R-390] CU-872A/U antenna coupler FS near Boston

[Nick England]

This has indeed been an interesting conversation!
Roger's message is definitely in the "Save It!" file.
We hams just aren't accustomed to that scale of HF receiving effort.

FWIW, here are a few items regarding the USN AN/FRD-10 Wullenweber system -
An FRD-10 component list that I have shows
quantity 196 ea.   CU-872/U multicouplers

CU-872/U block diagram and description
http://www.navy-radio.com/rcvrs/coupler/cu872.htm

A figure showing impedance for cables and equipment in the FRD-10A system
I think this is for a later version FRD-10 that used the CU-1382
multicoupler with 50 ohm in/out
http://www.navy-radio.com/rcvrs/frd10/cdaa-flow.JPG


Nick England K4NYW
www.navy-radio.com


On Thu, Feb 21, 2019 at 8:21 AM Thomas Chirhart <k4ncgva at gmail.com> wrote:

> The technical response is worthy of printing and saving. I’m betting the
> NavSecGru’s had these too behind a Wellenwebber (sp?) dinosaur cage.
> Somewhere up in the garage attic I have one.. I need to conduct a search
> and rescue mission to find it.
> 73
> Tom K4NCG
>
> Sent from my iPhone
>
>