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« on: December 30, 2019, 1626 UTC »
I've been working on the Pirate Radio Annual; it's going to be a long haul & I'm nowhere close to finished with it. I've just been starting to think about articles, etc. for it. One that I was thinking about was TDoA and if any measures can be taken to skew the results.
Would an article on this topic be of interest? If so, have any station operators experimented with TDoA and would any be interested in contacting me with information (to be used anonymously)?
Aside from broadcasting from locations where the signal can't be received by any of the participating online receivers, it seems that the best ways to intentionally alter the DF results would be to either:
* use two transmitters on exactly the same frequency from somewhat different locations that are fed with an Internet audio feed to keep the audio in sync
* use an AM transmitter in one location to lay down a carrier on a frequency and an SSB transmitter in a different location to modulate the carrier
Other less active possibilities seem to be:
* use of frequencies with a smaller ground wave
* use of antennas with low-angle radiation
* use of directional antennas
So I also wonder about the general accuracy of the TDoA results while just simply broadcasting on 43m with dipole or a nondirectional antenna. Has anyone noticed that the results are more or less accurate on different frequencies (e.g., 4 MHz vs. 6.9 MHz, etc.)? Any other variables?
Again, I'm interested in opinions, both whether this topic seems worth pursuing and, if so, any information on the topic. You can either contact me via an HFU message or at ayoder /at/ hobbybroadcasting /dot/ com
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