3 Vendor Questions and Answers.pdf
PDF 1 MB Posted
- Attached to
- Custom Built Oscillators Federal contract opportunity
- Solicitation number
- 1305M224Q0211
About this file
This document contains questions and answers related to a Request for Quote (RFQ) for custom built oscillators for the Radar Operations Center at the National Oceanic and Atmospheric Administration (NOAA). The key details are:
The oscillation frequency is specified as 114.75 to 133.60 MHz with an approximate step size of 0.0625 MHz. The government desires a single oscillator that can be "tuned" or "configured" to specific frequencies within that range, such as 115.11, 115.24, and 115.42 MHz, to support various operating sites. The jitter is specified as 5 ps maximum, measured over a 10 Hz to 10 MHz integration bandwidth. The government provided clarification on the measurement techniques, including using a spectrum analyzer and oscilloscope. This RFQ is for a small business set-aside contract with a NAICS code of 334419. First Article Testing is required.
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Other files for this federal contract opportunity
| File | Type | Posted |
|---|---|---|
| 3 Amendment 0003.pdf | ||
| 3 Vendor Questions and Answers Part 3.pdf | ||
| 3 Vendor Questions and Answers Part 2.docx | DOCX document | |
| 1 Drawing Revision C.pdf | ||
| 3 Amendment 0002.pdf | ||
| 3 Vendor Questions and Answers.pdf | ||
| 3 Amendment 0001.pdf | ||
| Diagrams Only for Vendor Q and A.docx | DOCX document | |
| 3 Amendment 0001.pdf | ||
| 3 Solicitation.pdf | ||
| 1 Drawing.pdf | ||
| 1 Statement of Need.pdf |
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Text version
Vendor Questions and Answers
1. The oscillation frequency is specified as 114.75 to 133.60MHz. Can you indicate the frequency step size required between these two frequencies?
.0625 MHz would be the approximate step size. See the last page for an example of the required oscillator frequencies (highlighted in green), how they correspond to the site frequencies, and what an acceptable frequency to the nearest kHz would be.
2. It is assumed a single oscillator is required to cover all frequencies over the indicated range and that the unit will be shipped preset to one of these frequencies, please confirm if this understanding is correct.
It would be ideal to have a single oscillator that is capable of covering that entire frequency range. But, our desire is to have an oscillator that is capable of being “tuned” or “configured” to a specific frequency by our depot team. For example, we have sites that operate at 2705, 2707, 2710 MHz (115.11021875, 115.23521875, 115.42271875
MHz Oscillator Frequency, respectively). We would like to have a single oscillator that is capable of being “tuned” or “configured” to those frequencies (and all of the other frequencies).
3. The jitter is specified as 5ps max. Can you indicate the integration bandwidth over which this jitter is required. We are assuming 10Hz to 10MHz.
This isn’t something that we can directly measure (integration bandwidth), but we can point you to the figures that we have for the next higher assembly regarding this (see figures 2 and 3 below).
SINGLE SIDEBAND FM NOISE RATIO (I Ht. BANDWIDTH) dBc
I 2 3 4567891 2 3 45678,1 2 3 ◄567891 2 3 -4567891 2 J -45678,10 I : I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I dBc
L--,.:.....:.....+--1 _:_---ir---+--i-t-1-,,-r7-4o c =i--1-111Tn11-GO L---:::==l::=::-:::J.- _J J_---l.--l.--l---1--l----1- -80
N f--
0,.., -100 r-----r-----r--"_;::=:::i.;- -r--r---r-,,--r- -120
=I:
C, z 0 I . I I =f?1 I I I I I 1- 140
CJ'l N
.._ ...._ _. -160 -:-x-: , -Jo Jo
,.., (.,J ,.., O>
-t
N -Jo
10 Hz • 100 Hf IKHi IOKHl IOOKHl IMHl
OFFSET FREQuENCY FROM CARRIER
FIGURE 2
r---;;
,:x.,:
n, z O_I,., Ng ..
SINGLE SIDEBAND AM NOISE RATIO Cl HI! BANDWIDTH) dBc
2 J 4 567891 2 J 4 567891 2 J 4 567891 2 J 4 s,1as 1 2 J 4 56 7191 d8c
-60
(J) r
I
-80 m v•o
I'\)
:E C) z
-120
-140
(J)
--I
I\J
I\J .
(,J
Cl
IOtG
IOOH IKH IOKH IOOKH
OFFSET FREQUENCY FROM CARRIER
-160
1MHz
"'L ::0 t:-i
FIG_URE 3
-100
4. Can you tell me if this NOAA oscillator solicitation is related to Nexrad interference with FAA ARSR-4 frequencies?
No, it is not related. The Radar Operations Center is not aware of the interference between NEXRAD and the ARSR-4.
5. The current NOAA solicitation has some requirement ambiguities that need to be resolved (e.g. frequency selections).
Our desire is to have an oscillator that is capable of being “tuned” or “configured” to a specific frequency by our depot team. For example, we have sites that operate at 2705, 2707, 2710 MHz (115.11021875, 115.23521875, 115.42271875 MHz Oscillator
Frequency, respectively). We would like to have a single oscillator that is capable of being “tuned” or “configured” to those frequencies (and all of the other frequencies).
6. Please provide clarification on what technique or method of measurement to use for output frequency stability.
Oscilloscope, spectrum analyzer, frequency counter, phase noise analyzer.
7. Please provide clarification on what technique or method of measurement to use for output frequency accuracy.
Oscilloscope, spectrum analyzer, frequency counter.
In regards to questions 6 and 7, we can share our measurements that we took using the spectrum analyzer and oscilloscope; please see below.
Fie Y.iew Markers Setup Presets Tools 't','ndow !!el:> dB/div:
" 15.0 dB
RBW:
10 Hz
Segments:
Traces
Markers
Start 115.550 MHz
" Stop 116.550 MHz
Detection f+i,eak =8
□Freeze
Spectrum
Res BW lli.00 HJz
IMarkersIITracesl[QJ
Analyzing
Frequency 116.050 MH
Acq BW: 1.25 MHz, Acq Length: 1.043 s
Ref Lev [is.OOd
Real Time Free Run
Span [i.000 MHz]
Ref: Int Atten: 20 dB
30 Hz
Traces
Start 111.050 MHz
" Stop 121.050 MHz
Detection f+i,eak =8
Spectrum
0 Show D Freeze
ITable II Demel
Res BW IMarkersI ITracesl[Q]
Analyzing Acq BW: 10.00 MHz, Acq Length: 272.4TTms Real Time Free Run
"limm
300 Hz
Start 91.0500 MHz
" Stop 141.050 MHz
Function 0 Show D Freeze
IIDemel
Spectrum Frequency 116.050 MH Ref Lev
Swept Free Run
Span [io.oMH
J
II Fie Y.iew Markers Setup Presets Tools 'l,lndow !!elp t_{j v Trace 1 0 Show +Peak Normal
15.00 15.0 • m 8J
RBW:
" 100 Hz
0VBW:
300 Hz
Segments:
0.0 •
-15.0 •
-30.0 •
-45.0 -
-60.0 •
-75.0 •
-90.0 •
-105.0 •
-120.0 •
-- -135.0•
Autoscale " Start 5.00000 kHz
I To Center 11 Peak I [QJ [ill
§equency 8p]
249225 MH
" Stop 750.000 MHz
Spectrum Frequency IFf002 MH:zj Ref Lev [is.OD d Span [±soMHz
Res BW 100 Hz J IMarkersJITracesJ[Q]
11:
Stopped Swept Free Run Ref: Int Atten: 20 dB
J
Markers I To Center 11 Peak I [QJ [ill §equency 8][p 560956 MH
Spectrum Frequency IFf002 MH:zj Ref Lev [is.OD d Span [±soMHz
Res BW 100 Hz J IMarkersJITracesJ[Q]
Fie Y.iew Markers Setup Presets Tools 'l,lndow !!elp v Trace 1
0 Show +Peak Normal
" Start 5.00000 kHz
II Fie Y.iew Markers Setup Presets Tools 'l,lndow !!elp t_{j v Trace 1 0 Show +Peak Normal
15.00 15.0 • m 8J
RBW:
" 100 Hz
0VBW:
300 Hz
Segments:
0.0 •
-15.0 •
-30.0 •
-45.0 -
-60.0 •
-75.0 •
-90.0 •
-105.0 •
-120.0 •
-- -135.0•
Autoscale " Start 5.00000 kHz
I To Center 11 Peak I [QJ [ill
§equency 8p]
810181 MH
" Stop 750.000 MHz
Spectrum FrequencyIFf002 MH:zj Ref Lev [is.ODd Span [±soMHz Res BW 100 Hz J IMarkersJITracesJ[Q]
);( 4801
Pk-Pk(l ): 2.044V 2.0419V 2.040V 2.045V 834.98uV 1.109k Freq(l ): 116.1MHz 116.04MHz 115.9MHz 116.1MHz 92.028kHz 1.109k
Period(l ): 8.61ns 8.6161ns 8.61ns 8.63ns 9.2028ps 1.109k
Site/Oscillator Freq
Site Freq
(MHz)
Oscillator Freq
Frequency
Step
(MHz)
Highest
Acceptable Freq
0.0005% Accuracy
Lowest
Acceptable Freq
0.0005%
Accuracy
Rounded
Oscillator Freq
(rounded to the nearest kHz) (MHz)
2700 114.797 718 75 .062 5 114.798 292 739 114.797 718 747 114.798
2701 114.860 218 75 .062 5 114.860 793 051 114.859 644 449 114.860
2702 114.922 718 75 .062 5 114.923 293 364 114.922 144 136 114.923
2703 114.985 218 75 .062 5 114.985 793 676 114.984 643 824 114.985
2704 115.047 718 75 .062 5 115.048 293 989 115.047 143 511 115.048
2705 115.110 218 75 .062 5 115.110 794 301 115.109 643 199 115.110
2706 115.172 718 75 .062 5 115.173 294 614 115.172 142 886 115.173
2707 115.235 218 75 .062 5 115.235 794 926 115.234 642 574 115.235
2708 115.297 718 75 .062 5 115.298 295 239 115.297 142 261 115.298
2709 115.360 218 75 .062 5 115.360 795 551 115.359 641 949 115.360
2710 115.422 718 75 .062 5 115.423 295 864 115.422 141 636 115.423
2711 115.485 218 75 .062 5 115.485 796 176 115.484 641 324 115.485
2712 115.547 718 75 .062 5 115.548 296 489 115.547 141 011 115.548
2713 115.610 218 75 .062 5 115.610 796 801 115.609 640 699 115.610
2714 115.672 718 75 .062 5 115.673 297 114 115.672 140 386 115.673
2715 115.735 218 75 .062 5 115.735 797 426 115.734 640 074 115.735
2716 115.797 718 75 .062 5 115.798 297 739 115.797 139 761 115.798
2717 115.860 218 75 .062 5 115.860 798 051 115.859 639 449 115.860
2718 115.922 718 75 .062 5 115.923 298 364 115.922 139 136 115.923
2719 115.985 218 75 .062 5 115.985 798 676 115.984 638 824 115.985
2720 116.047 718 75 .062 5 116.048 298 989 116.047 138 511 116.048
2721 116.110 218 75 .062 5 116.110 799 301 116.109 638 199 116.110
2722 116.172 718 75 .062 5 116.173 299 614 116.172 137 886 116.173
2723 116.235 218 75 .062 5 116.235 799 926 116.234 637 574 116.235
2724 116.297 718 75 .062 5 116.298 300 239 116.297 137 261 116.298
2725 116.360 218 75 .062 5 116.360 800 551 116.359 636 949 116.360
File details come from the government source that posted it. Updated .