[OZAPRS] HF APRS -2
lenniethelemming at gmail.com
Mon Dec 18 21:27:49 AEDT 2017
David Giddy has reminded me off-list of the existence of the UDRC-II:
This is pretty much what I was looking for, with the exception of the
onboard GPS. A little bit pricier than I was hoping for, but time vs money
and all that...
Would require a bit of coding to make whatever modem Glen writes key to the
relevant GPIO pins, but hey - open source, and I'm more than happy to write
and test code :-)
On Mon, Dec 18, 2017 at 7:35 PM, Mark Jessop <lenniethelemming at gmail.com>
> Given the cost of boards like the Raspberry Pi Zero, and other similar
> boards, I don't see it being targeted at ARM-NEON being that big of a deal.
> I guess a good product to complement the modem would be a 'shield' (or
> hat, or cape, or whatever the kids call them nowadays), for a raspberry pi
> or similar, that includes:
> - An Audio codec chip (probably via I2S? Example DAC board here, but no
> ADC: https://core-electronics.com.au/pimoroni-phat-dac-for-
> - PTT interface (relay? FET?)
> - Maybe even a GPS unit? (Something like a uBlox MAX-8 would go nicely)
> Of course you can do a lot of this with a USB sound card and some external
> circuitry, but I like the idea of a self-contained unit that you could
> mount in a small box.
> I might look into parts for such a board over the holidays, if I'm not too
> busy chasing balloons at Mt Gambier...
> Mark VK5QI
> On Mon, Dec 18, 2017 at 1:22 PM, Glen English VK1XX <
> glenlist at pacificmedia.com.au> wrote:
>> Matthew Cook asked me about the hardware and STM32 :
>> STM32F7 MIGHT run the decoder, for narrow bandwidth search windows and
>> slightly higher SNR requirements (+1 dB say) . The search algorithm is
>> intensive and the LDPC decoder is hard work, also. But there is a nice
>> vernier control on the "how hard it tries" to control CPU usage.
>> STM32-anything will definitely run the encoder (lots of LUTs in FLASH)
>> (it already is implemented on STM32L151 back in 2014)
>> talk soon when I am not so flat out
>> OZAPRS mailing list
>> OZAPRS at aprs.net.au
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