[amsat-bb] SatPC32 Doppler Correction/Calibration?

David Rush david at rushtone.com
Wed Jun 21 11:44:09 UTC 2017


Thanks for the reply.  So by repeatedly trying the same thing, have I 
shifted the uplink frequency by a bit more every time? Sounds like I may 
need to set those back.  Or else just find a new value in the opposite 
direction (starting a few multiples of the 160), set it once, and leave it.

73, David, KY7DR

On /20170621/ 00:55, George Henry wrote:
> You're doing it right...  once you store the uplink calibration, the 
> calibration values WILL return to zero, but if you look at the uplink 
> frequency displayed in the right-hand panel of the CAT window, it will 
> have a new value which is offset from the original frequency by 
> whatever calibration value you stored.
> 73,
> George, KA3HSW
> ----- Original Message ----- From: "David Rush" <david at rushtone.com>
> To: "Amsat BB" <amsat-bb at amsat.org>
> Sent: Tuesday, June 20, 2017 7:59 PM
> Subject: [amsat-bb] SatPC32 Doppler Correction/Calibration?
>> I'm trying to get the doppler correction/calibration set up for the 
>> various birds before Field Day, but I'm just not making any tangible 
>> progress.
>> I've got a pair of Yaesu FT-817ND rigs, and can successfully tune 
>> both of them with SatPC32's CAT controls.
>> Following the directions for a two-rig calibration process, I've been 
>> catching the XW-2* birds and can occasionally get the downlink 
>> correction set to where I can hear myself on the downlink.
>> In a couple of cases I've made note of where that downlink 
>> calibration was near mid-pass (the necessary correction changed 
>> constantly across the pass).
>> Then I go into the CAT menu, set the downlink correction to zero and 
>> the uplink calibration to the opposite sign of the previously found 
>> downlink correction at mid-pass.
>> For example on a recent pass of XW-2C I found a downlink correction 
>> of -160 Hz was working well near mid-pass (I could hear myself) so I 
>> set the uplink calibration to 160 Hz.
>> The "Upl. Calibr." window in the CAT pop-up says "160", and the grey 
>> box above the uplink frequency in the main window also says "160".
>> I click on the "Change/Store Dataf File" button, then click on the 
>> "Store" "Uplink Calibration" button on the next pop-up.
>> It says "The changings have been stored!" but the uplink calibration 
>> in both the first popup and the main window are back to zero.
>> I click the X to close both pop-ups, and uplink correction in the 
>> main window is still 0.  I exit the program, restart it, select 
>> XW-2C, enable CAT (C+) and the uplink calibration is still on zero.
>> What am I missing?
>> David, ky7dr
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