Radio Jamming Sound
Produced by K. J. Halliwell and Glenn Oliphant                            

Click here to listen to a synthesized "jamming sound" created by K. J. Halliwell with the assistance of Glenn Oliphant.  According to Glenn, it closely approximates the radio "jamming sound" he heard during the attack.

Glenn is a former US Navy Electronics Technician, and a survivor of the attack on USS Liberty.  During the attack, Glenn related that he heard a "buzzsaw" sound from an HF radio receiver (R-390A/URR), located in the ship's main radio transmitter room.  The tuned frequency of the radio receiver is not known for certain; it may have been tuned to either a frequency used for RATT (Radio Teletype) transmission by the Research Operations Department, or the HICOM (High Command) voice radio frequency used to send the distress call.  Glenn recalled that it was usually tuned to monitor the HICOM frequency.  He could not recall the location or type of antenna connected to the receiver.
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For comparison, here is a hyperlink to a website that contains a recording of a real, albeit at a long distance from the receiver, buzzsaw jamming transmission from a radio jamming station in Iran: http://www.aa5tb.com/sig02.html  (If this link fails, a copy of the recording is here: Iranian Jamming Sound)
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The following are testimonies and messages about radio frequency interference or jamming heard during the attack:

From Naval Court of Inquiry testimony of Wayne L. Smith, RMC: "...We did have [radio frequency] jamming in my estimation.  I was unable to determine this exactly, but every time it seems when an attack was made on us, or a strafing run, it was preceded by, anywhere from 25 to 30 seconds, carrier on our HiCom circuit, and I had ascertained to check this by calling the transmitter room and they said that they had not keyed the transmitter.  This prevailed during the attack and quite a bit after the attack, intermittently."

From Naval Court of Inquiry testimony of Carl Francis Lamkin, CTC:"...I heard [about radio jamming] from Radioman Chief SMITH.  He said that definitely that he had notice that the jamming was so loud that he thought at first that it was our transmitters which were malfunctioning but he noted, regardless of frequency, this loud jamming noise.  At that time we weren't aware of what they were transmitting at radio central.  This is one reason I stressed the fact that the men keep transmitting [distress messages from the transmitter room]."

Naval Court of Inquiry Finding 48:"LIBERTY apparently experienced a phenomenon identified as electronic jamming of her voice radio just prior to and during air attacks.  This jamming was described as a steady carrier without modulation."

R 112310Z JUL 67
FM NAVCOMMUNIT NAPLES
TO CNO
CINCUSNAVEUR
BT
S E C R E T US EYES ONLY
FOR ADMIRAL MCCAIN AND CAPT KING FROM RADM KIDD
LIBERTY REPORTED JAMMING
1. LIBERTY REPORTED APPARENT DISCRIMINATE JAMMING ON CERTAIN
CW AND VOICE CIRCUITS JUST BEFORE AND DURING EACH AIRCRAFTS
INDIVIDUAL ATTACK. EFFECT WAS TO SCARE MISCHIEF OUT OF THOSE
BELOW WHO HEARD IT START, BECAUSE THEY KNEW A ROCKET OR BOMB
WOULD SOON FOLLOW.
2. COURT CONSIDERED POSSIBILITY THIS PHENOMENON NOT RPT NOT JAMMING
BUT RATHER GUIDANCE RADIATION FROM PLANES RELATED TO THEIR VERY
ACCURATE ROCKET FIRE.
3. JCS TEAM TECHNICAL WERE DISAGREED AND COURT DID NOT SPECULATE.
4. NEWSWEEK ARTICLE REPORTING ON ISRAELI ROCKET METAL SEEKING
GUIDANCE EFFICACY DICTATES THIS POSSIBILITY BE RE-EXAMINED UNLESS
WE KNOW BY OTHER SOURCES EXACTLY HOW THEIR ROCKETRY WORKED.
5. IF THE SIGNALS IDENTIFIED AS JAMMING WERE JUST THAT, THE
METHOD OF EMPLOYMENT WAS SO INEFFECTIVE AS TO BE SUSPICIOUSLY
INCONSISTANT WITH THE REST OF THEIR BAG OF TRICKS.
GP-4
BT

R 261840Z JUL 67
FM CINCUSNAVEUR
TO CNO
BT
S E C R E T US EYES ONLY
LIBERTY REPORTED JAMMING (S)
A. NAVCOMMUNIT NAPLES 112310Z JUL 67
1. (C) CONCUR PARA 5 REF A, UNDER THE CIRCUMSTANCES IN EXISTENCE
AT THE TIME CAN SEE NO REASONABLE EXPLANATION FOR ELECTRONIC
JAMMING OF THE TYPE DESCRIBED.
2. (S) THE POSSIBILITY OF THE SIGNALS BEING GUIDANCE SIGNALS
FOR AIRCRAFT ROCKETS IS NOT DISCOUNTED, UNFORTUNATELY NAVEUR
HOLDINGS CONCERNING THE ISRAELI MIRAGE WEAPONS SYSTEM ARE
EXTREMELY LIMITED. IT WOULD BE INTERESTING TO KNOW IF THE
ISRAELIS ARE USING FRENCH AIR TO SURFACE ROCKETS OR AIRCRAFT
ROCKETS OF THEIR OWN DESIGN AND MANUFACTURE. HAVE NOTHING TO
PROVE THAT THE ISRAELIS HAVE IN FACT DEVELOPED THEIR OWN AIR TO
SURFACE ROCKETS BUT THIS IS A POSSIBILITY. ANSWERS TO THE
FOLLOWING COULD PROVIDE INSIGHT INTO THIS "JAMMING" PROBLEM:
   A. DO WE KNOW OF ANY ISRAELI DEVELOPMENT INFIR TO SURFACE
ROCKETS FOR USE WITH THEIR MIRAGES? IF SO, WHAT ARE THE
ELECTRONIC PARAMETERS OF THE GUIDANCE SIGNALS?
   B. WHAT ARE THE ELECTRONIC PARAMETERS OF THE GUIDANCE SIGNALS
OF FRENCH AIR TO SURFACE ROCKETS NORMALLY ASSOCIATED WITH THE
MIRAGE?
   C. COULD AIRCRAFT ROCKET GUIDANCE SIGNALS PROCUED THE JAMMING
EFFECT REPORTED BY LIBERTY?
3. (U) RECOMMEND THIS SUBJECT BE REVIEWED BY TECHNICAL AGENCIES
IN THE INTELLIGENCE COMMUNITY.
GP-4
BT