[amsat-bb] Expectations...

Clayton Coleman kayakfishtx at gmail.com
Fri Jan 2 18:07:41 UTC 2015


Kelley,

I've been manually moving my VFO for the best packet decodes but I've
noticed it's about spot-on with what SatPC32 is telling me.  I could
just turn on the CAT control but seeing as I was experimenting, I
wanted to fine tune it.

Good luck.  I hope we can make an exchange.

73
Clayton
W5PFG

On Fri, Jan 2, 2015 at 11:47 AM, Kelley <kshaddrick at jetup.net> wrote:
>
> Thanks for the info Clayton. I hope to play around with the Doppler on the
> next pass in a little over an hour. Sometime ago I bought Satpc32 but have
> never been successful in setting it up for my single IC-760MKIIG. Although I
> have other CAT programs that work fine with the radio, I can never seem to
> get that one to work. Seems like it would be a good one to do the Doppler
> shift with. Any thoughts on how to set this up? Or is one better off doing
> it manually?
>
> Thanks,
>
> Kelley - WØRK
>
> On 1/2/2015 12:10 AM, Clayton Coleman wrote:
>
> The #1 thing I've noticed is how much more important it is to tune for
> Doppler shift than when the ISS was using the Kenwood radio.
>
> I've done several tests decoding packets using my Kenwood TM-D700 which has
> 5 kHz tuning steps common on most 2m FM radios and then compared results to
> my Yaesu FT-857D which has much finer incremental tuning.
>
> In the past, I could decode most of a pass simply staying on 145.825 MHz.
> Nowadays, I start decoding around 145.828 and usually by LOS I'm decoding
> near 145.822.
>
> With the smaller tuning steps of the FT-857D I am able to decode about 30%
> more packets than my TM-D700.
>
> Simply put, in the past a fixed station could stay on 145.825 MHz with great
> results. Today, not so much.
>
> 73
> Clayton
> W5PFG
>
> On Jan 1, 2015 9:10 PM, "Kelley" <kshaddrick at jetup.net> wrote:
>>
>>
>> I put up a new antenna for ISS work today. It's a home-built 2m turnstile
>> with reflectors. Numbers wise (SWR, etc., as read on a MFJ analyzer) the
>> antenna is working. I used the antenna a bit on APRS and was able to hear
>> stations and be heard by stations.
>>
>> I listened to the ISS for 3 passes earlier today. On the first 2 passes I
>> heard a number of stations, but was unable to digi via the ISS. On the third
>> pass (about 40 degrees elevation at max and to the south), I was able to
>> digi via the ISS (sorry if I have the terminology wrong here, I'm somewhat
>> new at this).
>>
>> My question is, how often should I be able to digi via the ISS? Is it
>> unusual to not be able to on a given pass (all 3 passes were higher
>> elevation passes)? I know there are collisions and QRM involved and someone
>> wins out. I don't have the best station (IC-706MKIIG and a turnstile
>> antenna), I'm sure this plays a part.
>>
>> Curious what others have experienced.
>>
>> Thanks,
>> --
>> Kelley - WØRK
>>
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