Vietnam War TRC-3 Seismic Intrusion Detectors 134.500MHZ - Two Working

Description

Vietnam War TRC-3 Seismic Intrusion Detector Set  - Two (numbers 2 and 3) work properly, one emits a constant tone, the fourth does not appear to transmit.  Frequency is 134.500MHZ and all four units are sequential 1-4.  Each unit uses two standard 9v batteries, not included (lithium recommended).  They report in either a high or low beep corresponding to the ID number- 1-4 beeps.  Condition is "Used" but this set appears not to have been deployed, the geophone spike holders are not cracked but suggest planning for them to break. This is a known fragile part on these units.  Includes original canvas bag.  I have a dozen of these sets I will be listing.  I have seen these in use with the broken clips modified with  a section of hose which work better.   These are a 'go anywhere' alarm and will last months buried in the ground.  I've seen them used as vehicle and out building alarms too.  Military spec and built to last.  Please ask any questions before bidding, no international shipping.  Shipped with USPS Priority Mail Medium Flat Rate Box.  PayPal accepted.  Thanks for looking.
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