(Sanitized) SYSTEM FOUR FIELD REPORT DATED 7 APRIL 1958

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP81B00878R000200050032-5
• Release Decision: RIPPUB
• Original Classification: S
• Document Page Count: 1
• Document Creation Date: December 9, 2016
• Document Release Date: February 16, 2000
• Sequence Number: 32
• Publication Date: May 7, 1958
• Content Type: MEMO

Approved For Release 2000/09/01 : CIA-RDP81 B0087 e2 PO -5
Copy Of
Tee: WRSP-Z Cornmo
From. 25X1 A
Into Headquarters
Refs WRSP-Z System Four Field Report dated 7 April 1958
The receiver jumper plugs with the three indicator lights
will probably not be redesigned. Two screws drilled for safety wire
and properly arranged on the receiver front panel will permit the use
of safety v&AM secure the plug..
from Hycon was here as a consultant
and recommended that we ship a modified film magazine to you
based upon a design utilizing parts from an Eastman magazine .
The design was made by R-W personnel, but the plant had hesitated
to send it to the field because of the flimsy construction. As an
interim measure we agreed to supply this as a "throw away" item
until the 800-.foot magazine becomes available.` The modified
magazine is being assembled for shipment.
have not experienced any trouble due to stretching
of the recorder drive belt. Perhaps you are adjusting the belt
and maintaining too much tension initially.. The recommended
method is to tighten the belt just to the point of removing the sag
in the belt loop.
Over a temperature rang re of -550 C. to + 250 C. , the
peak inverse voltage rating of the 11591 diode is 1500 volts.
At, + 1000 C. this Berates to 1250 volts. At 1500 C. the value
derates to 1000 volts. Although this should be an adequate margin
of safety, the modification you described is good engineering
practice and certainly increases the safety factor.
The .650 volts and -1610 volts in the System 4 power
apply are now being monitored by means of a voltage divider.
A field modification kit will be sent,
If you need additional platen springs for the film
magazine, please order them from the depot. We have been
using them for many test runs without replacement, with good
success, and have had no trouble.
The film magazine is held in place by two screws, but there
are two ball: and detent alignment devices that will properly position
the magazine. One is located on. the aide of the magazine and the
other is located on the end of the magazine.
CLASS, U --
1A