[amsat-bb] AMSAT-BB Digest, Vol 12, Issue 178

Roy Dean royldean at gmail.com
Wed Jul 19 11:31:08 UTC 2017


I have a rather large thread going in the the QRZ satellite forum about my
raspi/rtl-sdr sat gate.    I am currently using a 3/4w vertical with 4
ground plane radials in my attic, and WITH a cheap VHF tv amp I was
averaging about 12 packets a day over the last 18 days (mostly from the
ISS, as NO-84 has been inactive for the most part).   Last night I
disconnected the amp to see if it was actually doing anything, and will be
updating the thread as I get more information.

I will say that prior to the 3/4 wave antenna, I was using a 1/4 wave with
good results, as well (maybe 75% as good as the 3/4 wave).   Also, what I
have realized is that while not 100% of my captured packets make it to
ariss.net or pcsat.aprs.org (mostly due to being duplicate packets), I DO
have evidence of capturing packets that never make it to either of those
websites, or even aprs.fi. Can't figure out if it's a problem with the
aprs-is system or direwolf.....


> Message: 6
>> Date: Tue, 18 Jul 2017 16:50:13 -0400
>> From: Andrew Northam <andrewbnortham at gmail.com>
>> To: AMSAT-BB at amsat.org
>> Subject: [amsat-bb] SatGate Antenna
>> Message-ID:
>>         <CAOeHS4e16nBVJ8c=zUACPhuMVzMg0cWYuiNZis4Xk1-LGY4UpQ at mail.
>> gmail.com>
>> Content-Type: text/plain; charset="UTF-8"
>> I would like to setup an SatGate, I have been running an iGate for a
>> little
>> while, and already have the Pi, TNC, Radio, LMR400...I have read the page
>> (
>> http://aprs.org/aprs-satellite-igate-antennas.html) about antennas, and
>> they all recommend a large ground plane, however I have a ranch style
>> house, and would like to put the antenna on the peak of my roof on a small
>> mast.
>> What kind of antenna would be best for on the peak of a roof? Would a 3/4
>> wave monopole work? Or should I look for something with radiators?
>> I have a great view to the North, East and South, but trees to the west
>> from Michigan (EN72ef)
>> Thanks for your help!
>> Andrew/KE8FZT

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