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authorkwilson <kwilson@web>2011-09-05 18:15:08 (GMT)
committer wiki <iki-wiki@psas.svcs.cs.pdx.edu>2011-09-05 18:15:08 (GMT)
commita913500f302cf3c0f88b28bb8d29b4bbe63e1567 (patch) (side-by-side diff)
treed2d40aa6406c68f30546b3a2da016407e1c5fcc0
parentce4bf5a5a59931057a77eb7b353d3322e314c167 (diff)
downloadwiki-a913500f302cf3c0f88b28bb8d29b4bbe63e1567.zip
wiki-a913500f302cf3c0f88b28bb8d29b4bbe63e1567.tar.gz
Clarified result tables. Added predicted values.
Diffstat (more/less context) (ignore whitespace changes)
-rw-r--r--cpatuningv4/cpa_tuning.mdwn32
1 files changed, 19 insertions, 13 deletions
diff --git a/cpatuningv4/cpa_tuning.mdwn b/cpatuningv4/cpa_tuning.mdwn
index 906213c..362e910 100644
--- a/cpatuningv4/cpa_tuning.mdwn
+++ b/cpatuningv4/cpa_tuning.mdwn
@@ -41,15 +41,21 @@ change in the vertical dimension (X) of the antenna radiator.
By measuring the current dimension of the radiator, and the current frequency
of the antenna an estimate of the necessary adjustment can be made.
- Xd = (fc/fg) * Xc
+ Xf = (fc/fg) * Xc
+
+ Xd = Xf - X
+
+ fg = Xc/Xf * fc
Where:
+ - X = original vertical dimension of radiator
+ - Xc = current value of X (mm)
+ - Xf = final vertical dimension of radiator
- Xd = delta X, the amount to change X (mm)
- fc = current frequency (Hz)
- fg = goal frequency (Hz)
- - Xc = current value of X (mm)
-
+
Dimensional measurement was performed with digital calipers.
N.B. Digitial calipers must be calibrated ('zeroed') prior to each measurement.
@@ -98,9 +104,9 @@ img2
### GPS Results Table
[[!table data="""
-Xc | Xd | fc | fg | Measured Frequency After Cut
-62mm | -1mm | 1.521708GHz | 1.575420GHz | 1.54422GHz
-61mm | -1mm | 1.54422GHz | 1.575420GHz | 1.570520GHz
+Xc | Xd | fc | fg | Expected Freq | | Measured Freq
+62mm | -1mm | 1.521708GHz | 1.575420GHz | 1.54665GHz | | 1.54422GHz
+61mm | -1mm | 1.54422GHz | 1.575420GHz | 1.56954Ghz | | 1.57052GHz
"""]]
### First Cut NA Measurements
@@ -121,19 +127,19 @@ this point.
## ATV CPA Tuning Results
Calculating the Xd for this antenna resulted in a requirement
-for Xd = (-0.5mm). This is expected to be the minimum manageable
+for Xd =~ (-0.5mm). This is expected to be the minimum manageable
amount of material to skive off the antenna. The actual measured
-amount removed was closer to Xd = (-0.8mm). This is also close
+amount removed was closer to Xd =~ (-0.8mm). This is also close
to the minimum distance measurement capability of the digital
-calipers. The actual amount removed is expected to be between
-0.5mm and 0.8mm. It is listed in the table as 0.5mm, which was
-the target amount.
+calipers. The actual amount removed is between 0.5mm and 0.8mm.
+Both values have been entered into the table.
### ATV Results Table
[[!table data="""
-Xc | Xd | fc | fg | Measured Frequency After Cut
-39.6mm | -0.5mm | 2.35GHz | 2.39GHz | 2.39GHz
+Xc | Xd | fc | fg | Expected Freq | | Measured Freq
+39.6mm | -0.5mm | 2.35GHz | 2.39GHz | 2.380519GHz | | 2.39000GHz
+39.6mm | -0.8mm | 2.35GHz | 2.39GHz | 2.399215GHz | | 2.39000GHz
"""]]
###Initial ATV NA Measurements