59-12MR-205 Questions and Responses.doc

Questions and Responses Solicitation number 59-12MR-205

Question 1

Since we are unable to obtain Monitron commercial manuals (no orders taken), will the government provide technical specification for the Monitron VHF Transmitters (model T16V27) and Monitron 10 channel VHF receiver (model R16-17-F-10). At a minimum, the below would be very useful in preparing our solution and response:

• VHF Channel Frequencies used and/or authorized

• Output Power (Watts)

• Receiver Sensitivity

What is the approximate spacing of geophones within the geophone arrays?

What is the geophone manufacture and model number currently used within the array?

Finally, can you please confirm the site visit location; 626 Cochran Mills Road, Pittsburgh, PA 15326 as this address is unknown using Google maps.

Response 1 VHF Channel Frequencies used and/or authorized:

The assigned splinter frequencies are as follows:

162.569875 MHz

163.396875 MHz

164.009375 MHz

164.846875 MHz

165.809375 MHz

166.421875 MHz

167.196875 MHz

171.215625 MHz

171.409375 MHz

173.196875 MHz

Transmitter Output Power (Watts):

500 mW (27dbm)

Receiver Sensitivity:

25 db S+N / N @ 1 microvolt typical: 10db S+N / N @0.5 microvolt minimum. (5 kHz dev.)

Geophones spacing within the geophone arrays:

Typically seven geophone arrays are configured in a double diamond pattern approximately 1200 to 1500 feet across. Each geophone array contains seven individual geophones. One geophone is located in the center of a 15ft diameter circular pattern. The remaining six geophones are distributed around the circumference of the 15 diameter circle.

Geophone manufacture and model number currently used within the array:

Geospace Corp, Digiphone, The correct address is: 626 Cochrans Mill Road, Pittsburgh, PA 15236