[OZAPRS] SatGate around VK7?

Mark Jessop lenniethelemming at gmail.com
Sat Dec 9 18:40:43 AEDT 2017


No, the way the mounting system works they *have* to be on separate
vertical masts, or use a cross-arm.

They're also easily light enough to go on a standard 'j-pole' mount, like
in this picture:
https://network.satnogs.org/media/ground_stations/IMG_20170813_155902.jpg

Or you can get a bit more creative with risers and such:
https://network.satnogs.org/media/ground_stations/IMG_20170730_155128.jpg

- Mark

On Sat, Dec 9, 2017 at 5:20 PM, Andrew Rich <vk4tec at tech-software.net>
wrote:

> So is it best to keep them on the same pole ? Or rework them ?
>
> Andrew
>
> Sent from my iPhone
>
> On 9 Dec 2017, at 9:22 am, Mark Jessop <lenniethelemming at gmail.com> wrote:
>
> No, they are mashed together into one stick.
> (Yes, they are separate, he just sells them as a kit).
>
> I use those turnstiles plus a MiniKits preamp on my SatNOGS stations. As
> mentioned previously, my only gripe with them is the possibly
> narrower-than-necessary antenna pattern. The SatNOGS guys in Greece are
> getting a few of them tested in a chamber for pattern & achieved gain, so
> it will be interesting to see what the pattern actually is.
>
> Apparently it is possible to widen the pattern by moving the reflectors
> back further, though I'm not sure exactly what distance should be used
> (they are currently at 1/4 wavelength). Time to break out NEC I suppose.
>
> 73
> Mark VK5QI
>
>
>
>
>
> On Sat, Dec 9, 2017 at 9:08 AM, <vk4tec at tech-software.net> wrote:
>
>> Mark that ebay, its it two separate antennae ?
>>
>>
>>
>> 144 and 440 MHz Turnstiles
>>
>>
>>
>> Andrew
>>
>>
>>
>> *From:* OZAPRS [mailto:ozaprs-bounces at aprs.net.au] *On Behalf Of *Mark
>> Jessop
>> *Sent:* Saturday, 9 December 2017 8:57 AM
>> *To:* Australian APRS Users <ozaprs at aprs.net.au>
>> *Subject:* Re: [OZAPRS] SatGate around VK7?
>>
>>
>>
>> Unless you apply some serious weatherproofing, an arrow antenna is
>> probably not a good idea for a long-term outdoor install. Keep the arrow
>> antenna for portable ops and either build or buy something else to go on
>> the rotator.
>>
>>
>>
>> I've been using a turnstile for my 2m SatNOGS ground station (also a
>> SatGate) for a while, and that works just fine for APRS from the ISS. It
>> doesn't perform amazingly well below 20 degrees elevation, but it's
>> definitely usable.
>>
>> The turnstile I'm using is from eBay: https://www.ebay.com.au/
>> itm/Set-of-2-antennas-turnstile-crossed-dipole-RHCP-2m-and-
>> 70cm-N-connector/292347719120?hash=item4411482dd0:g:Ry0AAOSw8gVYBd1P
>>
>>
>>
>> My only gripe with it is the spacing of the elements could have been a
>> bit larger, for a more hemispherical pattern. As it is, it has a bit of an
>> upwards lobe, hence the degraded performance at low elevation angles.
>>
>>
>>
>> I thought you built a turnstile - why not use that for the SatGate, i'm
>> sure it would perform just fine. Maybe put a filtered preamp on it to eke
>> out a bit more performance.
>>
>>
>>
>> 73
>>
>> Mark VK5QI
>>
>>
>>
>>
>>
>>
>>
>> On Sat, Dec 9, 2017 at 6:03 AM, Andrew Rich <vk4tec at tech-software.net>
>> wrote:
>>
>> Josh
>>
>> Try this
>>
>> Telnet rotate.aprs.net 14580
>> User password
>> #filter p/RS0ISS
>>
>> Than watch
>>
>> I just sold my vertical
>>
>> Arrow will go up on a rotator
>>
>> I have beaten my head against a brick wall trying to get vk4 going
>>
>> Andrew
>>
>> Sent from my iPhone
>>
>>
>> > On 8 Dec 2017, at 9:28 pm, Josh <vk2hff at vk2hff.ampr.org> wrote:
>> >
>> > From Sydney I often get picked up by satgates in VK3/4/5 and ZL - the
>> > ISS's footprint is pretty large.
>> > ISS is probably the only bird you'll have much luck with using just a
>> > HT, but you might get into NO-84 on a good pass.
>> >
>> > - Josh VK2HFF
>> >
>> >> On 8/12/2017 10:11 PM, Marcus B wrote:
>> >> I'm about to go on a hike through Tassie (Overland Track) in a few
>> >> weeks, and I've been thinking about taking my VX8 with me and
>> attempting
>> >> a few posits along the way, is there anyone in earshot of the ISS
>> >> SatGating around there? Any other aprs sats worth giving a go?
>> >>
>> >> 73,
>> >> Marcus
>> >>
>> >>
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