[OZAPRS] Roll Call - SAT GATES

[Mark Jessop]

Realistically most FM receivers are wide enough to not care about a few kHz
of doppler like you get on VHF LEOs. The receiver in my car (TM-D710G)
decodes the ISS fine without doppler correction.
On UHF it's of course a completely different story, with doppler pushing
the signal well past the edges of a standard FM receiver's RX filters.

Yes, doppler correction will probably improve performance somewhat, but I'm
not entirely sure the increase in ground-station complexity is completely
justified.

Go take a look at 145.175 MHz with a SDR at some point... plenty of
stations off-frequency!

73
Mark VK5QI

On Wed, Aug 30, 2017 at 8:17 PM, Andrew Rich <vk4tec at tech-software.net>
wrote:

> Doppler
>
> The ISS starts at 145.827 145.825 145.823
>
> Andrew
>
>
> On 30 Aug 2017, at 8:33 pm, Mark Jessop <lenniethelemming at gmail.com>
> wrote:
>
> I can reliably get into the ISS digipeater with 5 watts from my handheld -
> into a 3-element handheld yagi. (and if I remember to set the correct
> path...)
> I also managed to get into the LilacSat-1 FM-to-Codec2 transponder using
> 50mW of FM into the same antenna.
>
> Yes, if you are using an antenna not really designed for satellite
> operations (pointable, or at least circularly polarised to get over
> polarisation mismatch issues), then you will need higher powers to make up
> for the losses.
>
> There have been rumblings of putting a SatGate into a site on top of the
> Adelaide hills, but it hasn't happened yet. I can't guarantee mine is going
> to be that effective, so the more the merrier I think.
>
> 73
> Mark VK5QI
>
>
>
> On Wed, Aug 30, 2017 at 7:55 PM, Terry, VK5ATN <vk5atn at internode.on.net>
> wrote:
>
>>
>>
>> On 30/08/2017 3:59 PM, Andrew Rich wrote:
>>
>> Anyone running sat gates for ISS / NO-84 ?
>>
>> Andrew VK4TEC
>> _______________________________________________
>> OZAPRS mailing listOZAPRS at aprs.net.auhttp://lists.aprs.net.au/mailman/listinfo/ozaprs
>>
>> Not yet, but in the apparent absence of a working Igate in South
>> Australia I'm thinking about it- probably with a Microsat WX3in1
>> <http://microsat.com.pl/product_info.php?currency=USD&products_id=100&language=en>
>> .
>>
>> At present my efforts to have a beacon successfully digipeated from ISS
>> have relied on the Igates in WA or VK3KAW in Victoria (who seems to be off
>> air at present anyway).    The  optimum orbit for a successful login on
>> findu ISS page using the generous facility offered by the owners of these
>> stations largely for the enjoyment of others are complex, and it's not as
>> easy as it looks from a quick and simplistic glance at Orbitron or any
>> other program.
>>
>> In my experience, and remembering the situation I have described above,
>> I've never had any success with less than 25 watts into a 1/4 wave
>> vertical, and I've been doing this for a few years now.    If you can
>> reliably get a beacon to ISS with five or ten watts when the bird is
>> somewhere between 1,500 and 2,000 KM away then I'm interested.
>>
>> 73
>> Terry
>> VK5ATN
>>
>>
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