WA2ZKD

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Username: WA2ZKD
Email: wvzjim@wv@jizyvmliyy.ll.pbzcom
Joined: December 2016
Visits: 16,162
Last Active: March 28
Roles: Member
Points: 13

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TDoA Info, Hints, and Tips

WA2ZKD

July 2018

https://wireless.vt.edu/symposiumarchives/2015_slides/document.pdf
TDoA Fails

WA2ZKD

July 2018

My professional HF efforts are about 95% NVIS. It is not unusual to have multiple skywave components but also groundwave out 100's of KM. My work involves use of waveforms that accommodate doppler… (more)
Best Stations for TDoA

WA2ZKD

July 2018

This tool helps with RX selection http://ve3sun.com/KiwiSDR/index.php?TXcall=CHU Ottawa&TXfrequency=3330am&TXlatitude=45.0753605&TXlongitude=-94.3082902&propagationTX=1
GPS Antenna aiming

WA2ZKD

March 2018
There been some discussion about antenna gain and coax loss but perhaps more important is can your antenna "see" the birds. In exploring different antenna types, I learned a few things:
many people
… (more)
There been some discussion about antenna gain and coax loss but perhaps more important is can your antenna "see" the birds. In exploring different antenna types, I learned a few things:
many people think GPS sats are geostationary which they are not (I never thought that BTW!)
many people think that the constellation of sats in uniform around the Earth, it is not
depending on where you live there may be few usable sats to your north or south, in my case the former.
if your sat view is like mine or similar, avoid aiming into the "hole", see the graphic below from my kiwi
you can preview your sat coverage on a cellphone using something like GPS Status (Android)
there are sites that show the constellations such as https://in-the-sky.org/satmap_radar.php

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Best Stations for TDoA

WA2ZKD

July 2018

This tool helps with RX selection http://ve3sun.com/KiwiSDR/index.php?TXcall=CHU Ottawa&TXfrequency=3330am&TXlatitude=45.0753605&TXlongitude=-94.3082902&propagationTX=1

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WA2ZKD

About

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TDoA Info, Hints, and Tips

TDoA Fails

Best Stations for TDoA

GPS Antenna aiming

Best Stations for TDoA