Difference: AtfBpmNewLogBook_20110223 (1 vs. 5)

Revision 516 Apr 2012 - webmanip_5foldt2nt_2esh

Line: 1 to 1
 
META TOPICPARENT name="AtfBpmNewLogBook"

Gain Measurements

Line: 86 to 86
 
Changed:
<
<
META FILEATTACHMENT attachment="attempt1.png" attr="h" comment="" date="1298441023" name="attempt1.png" path="attempt1.png" size="139125" stream="attempt1.png" user="Public.FrancisCullinan" version="1"
META FILEATTACHMENT attachment="attempt2.png" attr="h" comment="" date="1298441071" name="attempt2.png" path="attempt2.png" size="77903" stream="attempt2.png" user="Public.FrancisCullinan" version="1"
META FILEATTACHMENT attachment="attempt3.png" attr="h" comment="" date="1298441118" name="attempt3.png" path="attempt3.png" size="70136" stream="attempt3.png" user="Public.FrancisCullinan" version="1"
META FILEATTACHMENT attachment="sband.png" attr="h" comment="" date="1298541817" name="sband.png" path="sband.png" size="56594" stream="sband.png" user="Public.FrancisCullinan" version="1"
>
>
META FILEATTACHMENT attachment="attempt1.png" attr="h" comment="" date="1298441023" name="attempt1.png" path="attempt1.png" size="139125" stream="attempt1.png" user="Public.FrankieCullinan" version="1"
META FILEATTACHMENT attachment="attempt2.png" attr="h" comment="" date="1298441071" name="attempt2.png" path="attempt2.png" size="77903" stream="attempt2.png" user="Public.FrankieCullinan" version="1"
META FILEATTACHMENT attachment="attempt3.png" attr="h" comment="" date="1298441118" name="attempt3.png" path="attempt3.png" size="70136" stream="attempt3.png" user="Public.FrankieCullinan" version="1"
META FILEATTACHMENT attachment="sband.png" attr="h" comment="" date="1298541817" name="sband.png" path="sband.png" size="56594" stream="sband.png" user="Public.FrankieCullinan" version="1"

Revision 428 Feb 2011 - FrancisCullinan

Line: 1 to 1
 
META TOPICPARENT name="AtfBpmNewLogBook"

Gain Measurements

Line: 7 to 7
 

Procedure

The signal generator is connected to the input of the electronics box and the output is connected to the HP spectrum analyser. The output of the signal generator is varied between -85 and -3dBm at 6.426GHz and the amplitude of the resulting peak at 26MHz on the spectrum analyser is recorded. The output power is plotted against the input power and the final result is obtained by extrapolating the line to 0dBm. Measurements made near compression or the noise background are rejected if their chi-squared is greater than nine. The result is then recalculated and the selection repeated. The rejected measurements are shown in red.
Changed:
<
<
It was discovered the day after that the signal generator output was offset from the displayed value. This was measured to be 18.3+/-0.4dB (YoungIm).
>
>
It was discovered the day after that the signal generator output was offset below the displayed value. This was measured to be 18.3+/-0.4dB (YoungIm).
 

Results

Revision 324 Feb 2011 - FrancisCullinan

Line: 1 to 1
 
META TOPICPARENT name="AtfBpmNewLogBook"

Gain Measurements

Line: 63 to 63
 
QM11FFx 25.6 0.2
QM11FFy 26.0 0.4
Added:
>
>

S-Band

This time, the input RF is set to 2.890GHz and again, a variable attenuator is used.

Results

sband.png

Bpm Gain/dB Error/dB
SF1FFx 9.2 0.2
SF1FFy 2.8 0.3
SD0FFx 9.4 0.2
SD0FFy 9.8 0.2
 

Revision 223 Feb 2011 - FrancisCullinan

Line: 1 to 1
 
META TOPICPARENT name="AtfBpmNewLogBook"

Gain Measurements

Changed:
<
<

1st Attempt

<\noautolink>
>
>

1st Attempt

 

Procedure

Changed:
<
<
The signal generator is connected to the input of the electronics box and the output is connected to the HP spectrum analyser. The output of the signal generator is varied between -85 and -3dBm at 6.426GHz and the amplitude of the resulting peak at 26MHz on the spectrum analyser is recorded. The output power is plotted against the input power and the final result is obtained by extrapolating the line to 0dBm. Measurements made near compression or the noise background are rejected if their chi-squared is greater than nine. The result is then recalculated and the selection repeated.
>
>
The signal generator is connected to the input of the electronics box and the output is connected to the HP spectrum analyser. The output of the signal generator is varied between -85 and -3dBm at 6.426GHz and the amplitude of the resulting peak at 26MHz on the spectrum analyser is recorded. The output power is plotted against the input power and the final result is obtained by extrapolating the line to 0dBm. Measurements made near compression or the noise background are rejected if their chi-squared is greater than nine. The result is then recalculated and the selection repeated. The rejected measurements are shown in red.
 
Changed:
<
<
It was discovered the day after that the signal generator output was offset from the displayed value. This was measured and the correction was applied.
>
>
It was discovered the day after that the signal generator output was offset from the displayed value. This was measured to be 18.3+/-0.4dB (YoungIm).
 
Changed:
<
<

2nd Attempt

>
>

Results

attempt1.png

Bpm Gain/dB Error/dB
QM14FFx 24.6 0.3
QM14FFy 27.2 0.3
QM12FFx 26.5 0.4
QM12FFy 28.1 0.3
QM11FFx 27.8 0.3
QM11FFy 26.6 0.3
QF9BFFx 27.2 0.3
QF9BFFy 26.0 0.3
QD8FFx 26.9 0.3
QD8FFy 26.8 0.3
QF7FFx 26.2 0.3
QF7FFy 25.9 0.3
SF5FFx 25.5 0.3
SF5FFy 27.7 0.3

2nd Attempt

 

Procedure

Changed:
<
<
This time, the signal generator was a Hittite HMC-T2000. It's output range at 6.426GHz is -15dBm to +10dBm. To extend it's range, four attenuators were added and removed in turn during the tests. The output was measured using a spectrum analyser. The loss in the output cable was later measured using a power meter.
>
>
This time, the signal generator is a Hittite HMC-T2000. It's output range at 6.426GHz is -15dBm to +10dBm. To extend it's range, four attenuators are added and removed in turn between measurements. The output was measured using a spectrum analyser. The loss in the output cable was later measured using a power meter. The effect of the attenuators seemed to vary which caused the gradient of the fitted line to deviate from 1. Therefore, the data are split according to the number of attenuators and analysed separately. The average results is used for the gain.

Results

 
Changed:
<
<

3rd Attempt

>
>
attempt2.png

Bpm Gain/dB Error/dB
QM14FFx 22.1 1.4
QM14FFy 28.0 1.3
QM12FFx 24.6 1.1
QM12FFy 27.0 1.1
QM11FFx 31.8 1.1
QM11FFy 30.7 1.2

3rd Attempt

 

Procedure

Changed:
<
<
This was similar to the second attempt except a variable attenuator with a range of 0-70dB was used in place of two of the fixed attenuators. The output power was varied by changing the attenuation and again, the output was measured with a spectrum analyser and the output cable loss with a power meter.
>
>
This is similar to the second attempt except a variable attenuator with a range of 0-70dB is used in place of two of the fixed attenuators. The output power is varied by changing the attenuation and again, the output is measured with a spectrum analyser and the output cable loss, with a power meter. The analysis procedure is the same as in the first attempt.

Results

 
Added:
>
>
attempt3.png
 
Added:
>
>
Bpm Gain/dB Error/dB
QM14FFx 24.4 0.2
QM14FFy 21.6 0.3
QM12FFx 24.0 0.2
QM12FFy 22.9 0.2
QM11FFx 25.6 0.2
QM11FFy 26.0 0.4

<--

Settings just to customise this page

-->

META FILEATTACHMENT attachment="attempt1.png" attr="h" comment="" date="1298441023" name="attempt1.png" path="attempt1.png" size="139125" stream="attempt1.png" user="Public.FrancisCullinan" version="1"
META FILEATTACHMENT attachment="attempt2.png" attr="h" comment="" date="1298441071" name="attempt2.png" path="attempt2.png" size="77903" stream="attempt2.png" user="Public.FrancisCullinan" version="1"
META FILEATTACHMENT attachment="attempt3.png" attr="h" comment="" date="1298441118" name="attempt3.png" path="attempt3.png" size="70136" stream="attempt3.png" user="Public.FrancisCullinan" version="1"

Revision 123 Feb 2011 - FrancisCullinan

Line: 1 to 1
Added:
>
>
META TOPICPARENT name="AtfBpmNewLogBook"

Gain Measurements

1st Attempt

<\noautolink>

Procedure

The signal generator is connected to the input of the electronics box and the output is connected to the HP spectrum analyser. The output of the signal generator is varied between -85 and -3dBm at 6.426GHz and the amplitude of the resulting peak at 26MHz on the spectrum analyser is recorded. The output power is plotted against the input power and the final result is obtained by extrapolating the line to 0dBm. Measurements made near compression or the noise background are rejected if their chi-squared is greater than nine. The result is then recalculated and the selection repeated.

It was discovered the day after that the signal generator output was offset from the displayed value. This was measured and the correction was applied.

2nd Attempt

Procedure

This time, the signal generator was a Hittite HMC-T2000. It's output range at 6.426GHz is -15dBm to +10dBm. To extend it's range, four attenuators were added and removed in turn during the tests. The output was measured using a spectrum analyser. The loss in the output cable was later measured using a power meter.

3rd Attempt

Procedure

This was similar to the second attempt except a variable attenuator with a range of 0-70dB was used in place of two of the fixed attenuators. The output power was varied by changing the attenuation and again, the output was measured with a spectrum analyser and the output cable loss with a power meter.
 
This site is powered by the TWiki collaboration platform Powered by PerlCopyright © 2008-2022 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding RHUL Physics Department TWiki? Send feedback