[OZAPRS] Roll Call - SAT GATES

[Andrew Rich]

Icom 910
Rtl-sdr
Icom r20
Hack rf
Airspy mini
Sdrplay rsp2


Sent from my iPhone

> On 30 Aug 2017, at 9:27 pm, Mark Jessop <lenniethelemming at gmail.com> wrote:
> 
> Exactly what receiver were you using? 
> 
> I suspect performance with frequency offset would depend heavily on the particular receiver's filter width and filter sharpness. 
> If the filter is too sharp, any bumping up against the edges will result in clipping and make a packet un-decodable. 
> Use a receiver with wider / softer filters, and it may perform better.
> 
> 73
> Mark VK5QI
> 
> 
> 
> 
> 
>> On Wed, Aug 30, 2017 at 8:38 PM, Andrew Rich <vk4tec at tech-software.net> wrote:
>> You miss a few packets 
>> 
>> I have sat here many a pass and compared
>> 
>> Andre w
>> 
>> 
>>> On 30 Aug 2017, at 8:53 pm, Mark Jessop <lenniethelemming at gmail.com> wrote:
>>> 
>>> 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
>>>>>>> _______________________________________________
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>>>>>> Not yet, but in the apparent absence of a working Igate in South Australia I'm thinking about it- probably with a Microsat WX3in1 .
>>>>>> 
>>>>>> 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
>>>>>> 
>>>>>> 	Virus-free. www.avast.com
>>>>>> 
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>>>>> 
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>>>> 
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