MODIFICATION
16 -- HF TOWEL BAR ANTENNA
- Notice Date
- 2/28/2006
- Notice Type
- Modification
- NAICS
- 336413
— Other Aircraft Parts and Auxiliary Equipment Manufacturing
- Contracting Office
- DHS - Direct Reports, United States Coast Guard (USCG), Commanding Officer, USCG Aircraft Repair & Supply Center, HU25, HH65, H60J, C130, EISD, 130J or Support Procurement Building 79, 75, 79, 78, 78, 19 or 63, Elizabeth City, NC, 27909-5001
- ZIP Code
- 27909-5001
- Solicitation Number
- HSCG38-06-Q-200013
- Response Due
- 3/3/2006
- Archive Date
- 3/18/2006
- Point of Contact
- Cynthia Soules, HH65 Contract Specialist, Phone 252-335-6641, Fax 252-334-5240, - Wade Johnson, HH65 Contract Specialist, Phone 252-335-6438, Fax 252-334-5240,
- E-Mail Address
-
Cynthia.D.Soules@uscg.mil, Wade.Johnson@uscg.mil
- Description
- This amendment is issued to address questions posed by a prospective offeror: QUESTION: Could you tell us the footprint details of the (two?) existing mast interfaces with the HH65 tail cone? We have assumed that one of them is the Collins 437R-2 antenna footprint, but we don't know what the other one is. ANSWER: The Collins 437R-2 Monopole antenna (antenna feed) will be removed. The existing long wire antenna is terminated at the stinger (tail skid) with an insulator and a tension adjustor. The stinger is composite material with a metal skid plate on the bottom. This is not the location that we would terminate a towel bar antenna design (too susceptible to damage). QUESTION: Are you presently feeding the existing antenna from the front or from the back? ANSWER: Front. Use of existing mount (removed 437R-2) at feed through is a possibility. QUESTION: Are the inner and outer metal skins of the tail cone aluminum alloy? If not, what are they? We note that the SOW, figure 1-90, paragraph 2, indicates that "tail cone panels consist of an inner and outer metal skin with a nomex honeycomb material sandwiched between them. The individual panels are ELECTRICALLY INSULATED FROM ONE ANOTHER for corrosion prevention purposes". ANSWER: The tail cone is nomex composite sheathed in aluminum skin. The fenestron is entirely composite. The statement in fig 1-90, paragraph 2 refers to individual panels such as the tail rotor drive shaft fairings, cowling, heat shield panels, etc. QUESTION: What approach would you prefer to creating a suitable RF conduction loop? ANSWER: The Coast Guard is interested in recommendations and any data on previous installations using these techniques. The requirement is long range communication. Near Vertical Incident Skywaves (NVIS) is not the objective. The question is, when using HF frequencies on an ALE network, typically with 10 Channels in the 3-23 Mhz range (most at 9-23 MHz) which configuration would work best? Closed loop or open? QUESTION: Does the geometry of the HH65 indicate it will be necessary to attach anything to the vertical fin? If so, does USCG have any preferred anti-corrosion process, such as ivadizing? ANSWER: To achieve the minimum 10 foot requirement the antenna will likely terminated at the fenestron (vertical fin). If a closed loop design is elected, recommendations on how to best achieve the required ground would be expected. Mediation of corrosion issues fall under the purview of the Coast Guard, however experience and recommendations of attachment hardware are always welcome. QUESTION: Would it be possible to visit you to measure and photograph the applicable areas of a USCG HH65 before we complete proposal for your HF Towel Bar antenna? ANSWER: Site visits may be coordinated through Mr. Robert Vessey at (252)335-6711.
- Record
- SN00995912-W 20060302/060228211752 (fbodaily.com)
- Source
-
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