<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<div class="elementToProof" style="font-family: Aptos, "Aptos_EmbeddedFont", "Aptos_MSFontService", Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
One of the results of this Tcal excercise which encourages confidence is the run of calculated TCals values with frequency. </div>
<div class="elementToProof" style="font-family: Aptos, "Aptos_EmbeddedFont", "Aptos_MSFontService", Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div class="elementToProof" style="font-family: Aptos, "Aptos_EmbeddedFont", "Aptos_MSFontService", Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
I took one of the 8-bit X-band flux density observations (31 January 2025) and generated the 'updated' Tcal values for all 16 spectral windows. The results from two of the antennas (ea02 and ea08) are attached. There are four plots, as the frequency coverage
is in two 1 GHz-wide blocks, centered at 8.4 and 11.0 GHz. </div>
<div class="elementToProof" style="font-family: Aptos, "Aptos_EmbeddedFont", "Aptos_MSFontService", Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div class="elementToProof" style="font-family: Aptos, "Aptos_EmbeddedFont", "Aptos_MSFontService", Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
The 'old' (lab measured) TCals are in open circles with dashed lines. The 'new' (3C286-calibrated) TCals are in solid circles with solid lines. RCP in black, RCP in red. For all plots (but especially for ea02), the 'old' Tcals show considerable scatter over
frequency, while the 'new' Tcals are quite smooth. This is physically reasonable. </div>
<div class="elementToProof" style="font-family: Aptos, "Aptos_EmbeddedFont", "Aptos_MSFontService", Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
There are also offsets between the old and new values. </div>
<div class="elementToProof" style="font-family: Aptos, "Aptos_EmbeddedFont", "Aptos_MSFontService", Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div class="elementToProof" style="font-family: Aptos, "Aptos_EmbeddedFont", "Aptos_MSFontService", Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
For all plots the eighth (highest frequency) 'new' TCal value is considerably offset from the other values. This is an artifact, doubless caused by these two spectral windows are on the edge of the analog bandpass — the bandpass plots show a dramatic drop
in amplitude (up to an order of magnitude) in this spectral window. </div>
<div class="elementToProof" style="font-family: Aptos, "Aptos_EmbeddedFont", "Aptos_MSFontService", Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div class="elementToProof" style="font-family: Aptos, "Aptos_EmbeddedFont", "Aptos_MSFontService", Calibri, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Rick</div>
</body>
</html>