On 3/12/2017 10:50 AM, David Ranch wrote:
Hello David,
I did read your blog entry, the associated WeNet presentation, and the Wenet github page. It all sounds fascinating but it was
very high level on the TX side (just highly brushed over). I'd love to see a higher throughput solution out there and I have
questions like:
- Which FSK TX board were you using? It looks like it's based on a RFM98W RoRA board which might be soldered onto another
Rpi HATT board (hard to tell from the 2016_11_wenet_presentation.pdf but maybe that's the FSK modem sitting on top of another
Hab Supplies board?
David's question leads me to a couple of questions.
The TX description says:
"the transmit side is designed to run on a Raspberry Pi, and the
UART (/dev/ttyAMA0) is used to modulate a RFM98W (yes, a LoRa module) in
direct-asynchronous mode. "
From this, I gather that data is applied to the DIO pin asynchronously,
bypassing
the packet handler, transmit BT shaping and is in non-LoRa FSK mode. Correct?
This probably means there's no need to pay the premium price for the LoRa radio
(Semtech gets a healthy fee for the LoRa IP) and that a conventional FSK radio
(like
the RFM69HW) could be equally used? (I believe it supports the same continuous
mode parameters as the LoRa radios).
I also gather that the coding-gain/throughput trade-off of the LoRa modem makes
it un-appealing for SSDV here.
73,
Dana K6JQ
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