[amsat-bb] SatPC32 Doppler Correction/Calibration?

[George Henry]

Go into your Doppler.sqf file and edit the up- and downlink frequencies back 
to the original values.  Then use the uplink calibration buttons to find 
yourself on the downlink.  Then click the Change/Store data file button and 
store the uplink calibration.  I've never touched the downlink correction on 
a sat with a linear transponder...

George, KA3HSW


----- Original Message ----- 
From: "David Rush" <david at rushtone.com>
To: <amsat-bb at amsat.org>
Sent: Wednesday, June 21, 2017 7:53 PM
Subject: Re: [amsat-bb] SatPC32 Doppler Correction/Calibration?


> Okay, I followed the instructions (as I described below).  I found myself 
> on a couple of the XW-2* birds, and kept adjusting my downlink correction 
> until I was at about peak elevation in the pass (I even made one contact 
> while one of the birds was still on its way up).  Then zeroed out the 
> downlink correction and entered the opposite in uplink correction, and 
> saved it.
>
> Once I did that I did not hear myself on the downlink, and failed to find 
> myself, even trying a few 10s of hz of d/l correction either side, before 
> the birds got too low on the horizon.
>
> What am I doing wrong?
>
> David, ky7dr
>
>
> On /20170621/ 07:44, David Rush wrote:
>> George:
>>
>> 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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>>>
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>>
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>
> _______________________________________________
> Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions 
> expressed
> are solely those of the author, and do not reflect the official views of 
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb