6 SON for RFQ_V.1.pdf

Statement of Need Replacement of X14 Frequency Multiplier

NWS Radar Operations Center

OR-FY26-03422, REQUIREMENTS-26-3520, 142082-26-0434

1. Purpose

The National Weather Service (NWS) Radar Operations Center (ROC), WSR-88D NEXRAD Radar Program, located in Norman, Oklahoma, requires a replacement for the X14 Frequency Multiplier utilized within the NEXRAD receiver.

The X14 Frequency Multiplier will be referred to as the A2A1 unit in this document and is otherwise identified by the following:

National Stock Number: 5998-NX-400-0593 Agency Stock Number Reference Identification: R400-4A1A2A1

The current A2A1 unit is no longer repairable or purchasable. As such, NWS is seeking a replacement A2A1 unit capable of meeting current and future operational needs while maintaining the required fit, form, and function of the existing A2A1 Assembly.

NAICS 334419 – Other Electronic Component Manufacturing.

PSC: 5998 – Electrical and Electronic Assemblies, Boards, Cards, and Associated Hardware.

2. Background

The NWS ROC NEXRAD Program is responsible for the lifecycle support of the WSR- 88D NEXRAD radar and related systems. There are 158 operational radars located within the continental United States and select sites overseas.

Each radar consists of three primary parts:

1. Radar Data Acquisition (RDA);

2. Radar Product Generator (RPG); and

3. Various product display systems.

The A2A1 unit is a fixed-frequency, 14-times frequency multiplier. It operates by distorting the input sinusoidal waveform, then isolating the 7th harmonic through a tunable comb-line filter for 7x multiplication. The 7th harmonic is amplified, then LC filters are used to isolate the 2nd harmonic for 2x multiplication. Finally, the resulting 805 MHz signal enters two additional amplification stages before the signal is split into two different output power levels using two resistive pi networks in parallel.

The A2A1 unit is part of the greater WSR-88D RF Generator assembly, which is responsible for creating the radar’s operational frequency. The A2A1 unit receives a

57.5491 MHz input signal at J1 from a crystal oscillator module and outputs two

805.6874 MHz signals at J2 and J3. The J2 and J3 output signals are routed to two separate mixers.

The current A2A1 unit reached end-of-life (EOL) in 2018 and is no longer able to be repaired. NWS seeks to ensure that an A2A1 replacement is available for continued sustainment, compatible for use within the WSR-88D NEXRAD Doppler Radar system.

3. Requirements

The Source Control Document (SCD), ROC Drawing 2200737, is attached to this purchase request. This drawing establishes the WSR-88D requirements for the A2A1 unit, part number 2200737-201.

Any future A2A1 replacement units will require the following minimum technical aspects for use within the NWS ROC WSR-88D NEXRAD Doppler Radar.

Note: Vendors should reference the attached Source Control Document for applicable tolerances.

Electrical Requirements

The replacement A2A1 unit shall:

1. Accept a +10 dBm 57.5491 MHz CW signal and output two phase-coherent 805.6874 MHz CW signals at approximately:

o +0.5 dBm; and o +4.0 dBm.

2. Have an input VSWR no greater than 1.5:1.

3. Have a characteristic RF impedance of 50 ohms.

4. Ensure phase noise gain from the frequency multiplication process does not exceed +30 dB at any point from 10 Hz to 1 MHz offset of output frequency.

5. Ensure the average phase noise gain for the 10 Hz to 1 MHz offset frequency range does not exceed +25 dB.

6. Be powered by +15 VDC and draw a maximum of 300 mA.

7. Use the enclosure for ground reference for all ground connections.

8. Include electrical connections to and from the unit as listed in Table I of the Vendor Item Drawing (VID).

Mechanical Requirements

The replacement A2A1 unit shall:

1. Have an enclosure that is form and fit identical to the item outlined in Figure 1 of the VID.

2. Place electrical connectors approximately as depicted in Figure 1 of the VID.

3. Have a corrosion-resistant and electrically conductive coating.

4. Not require the four tuning screws depicted in Figure 1 of the VID.

Environmental Requirements

The replacement A2A1 unit shall meet the following environmental requirements:

1. Operating temperature range: -40°C to +85°C.

2. Non-operating temperature range: -55°C to +125°C.

3. Operating humidity range: 15% to 95%.

4. Non-operating humidity range: 15% to 95%.

5. Capable of operating at an elevation of at least 3,300 meters Mean Sea Level

(MSL).

4. Deliverables

CLIN 0001: FIRST ARTICLE

FIRST ARTICLE: X14 Frequency Multiplier, quantity 1, as per vendor Item control drawing 2200737 Rev B, part number 2200737-201 to be delivered within 20 weeks of purchase order award. Delivery shall also include a First Article Test Report that defines how the vendor tested the First Article unit to ensure it meets the specifications.

Upon delivery, the Government will complete a physical inspection on the delivered First Article for quality and adherence to the attached Drawing 2200737 Rev B specifications.

The Government will also perform a test installation and run the First Article for at least one week; final First Article Acceptance/Rejection will be no later than four weeks after delivery.

Price shall include FOB Destination shipping to:

Radar Operations Center Attn: Lindsey Alberts Engineering Branch/W/OBS13 1200 Westheimer Drive Norman, OK 73069

CLIN 0002: OPTIONAL CLIN – PRODUCTION UNITS

PRODUCTION UNITS, X14 Frequency Multiplier, quantity 26, as per vendor item control drawing 2200737 Rev B, part number 2200737-201, to be delivered within 20 weeks of First Article Acceptance (CLIN 0001) or the date this optional CLIN 0002 is exercised whichever date is latest. Partial deliveries are encouraged and accepted at no additional cost to the Government.

National Stock Number: 5998-NX-400-0593 Agency Stock Number Reference Identification: R400-4A1A2A1.

Price shall include FOB Destination shipping to:

National Logistics Support Center (NLSC) Attn: (Insert PO#, CLIN 0002) 14200 Merritt Rd Grandview, MO 64030

5. Attachment/Links

The following attachment is included with this Statement of Need:

ROC Drawing 2200737, Rev B