MIL-HDBK-162A
Volume 1
15 December 1965
Section 1
DATE: 1 April 1964
ITEM NAME: INTERFERENCE BLANKER GROUP
COGNIZANT SERVICE: USAF
TYPE: AN/GPA-28
FEDERAL STOCK NUMBER: 5840-338-4105
USA
USN
USAF
USMC
STATUS OR TYPE CLASSIFICATION
Alt Std
Mfg(s) Name or Code Number: Empire Devices Products Corp.
RELATION TO SIMILAR EQUIPMENT
None.
TECHNICAL DESCRIPTION
IF. Frequency: 30 mc
IF. Bandwidth: 13.5 mc
Radar Trigger Input:
Amplitude - +20 to +50v, peak
Pulse Duration - 0.5 to 10 ,sec
Impedance - 390,000 ohms
Radar Trigger Output:
Amplitude - 2 to 20v, peak
Pulse Rise Time - 0.3 ;sec
Impedance - 50 ohms
Receiver Bandpass: 22 to 25 mc and 35 to 38 mc
Receiver Rejection Band: 28 to 32 mc
Power Requirements: 105 to 125v, rms, 50 to
65 cps, 1-ph, 520w
INSTALLATION CONSIDERATIONS
FUNCTIONAL DESCRIPTION
Siting: Determined by the location of the particular
Interference Blanker Group AN/GPA-28 is used to
radar installation to be protected against
protect a group of up to three radar receivers from
interference signals.
nearby radar transmitter interference. The trigger output
Mounting: Equipment may be located in Shelter S-
of the radar receiver component is applied to
63/CPN-18. No provision has been made for
Interference Blanker Group AN/GPA-28. Operation of
outdoor operation.
the blanker unit causes the interference to be bracketed
Cabling Requirements:
with a negative blanking gate. The width of the blanking
Related Equipment: When used with radar sets
gate may be manually adjusted, by front panel controls,
other than the AN/CPN-18, Delay Line
within the limits of 5 to 100 M sec.
Since the
MX1788/CPN-18 is removed from the blanker
interference is not usually synchronized with the
subassembly, and a different, applicable delay
protected radar, the loss of desired information is
line substituted.
negligible.
AN/GPA-28: 1
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