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OE5HPM > MODEM 25.08.18 13:33l 43 Lines 1594 Bytes #999 (999) @ WW
BID : P8SOE5XBL018
Read: DF7EAV GUEST DK3HG DL7AJD
Subj: Re: What modem do you use today
Path: DB0FHN<DB0PM<OE2XZR<OE5XBL
Sent: 180825/1112z @:OE5XBL.#OE5.AUT.EU [St.Johann/Wald] obcm1.07b13-17-ga379 L
From: OE5HPM @ OE5XBL.#OE5.AUT.EU (Hannes)
To: MODEM @ WW
X-Info: Sent with login password
dear readers,
we operate here on oe5xbl on 5 frequency in parallel.
144.900 - packet radio access in afsk 1k2 and 2k4
144.800 - aprs igate and digi in afsk 1k2
433.800 - aprs igate and digi in afsk 1k2
438.475 - packet radio access in afsk 1k2, 2k4 and fsk 4k8, 9k6
1240,200 - interlink to db0aat in fsk 19k2 full duplex
all those radios are connected to a single computer where the
ptt lines are controlled with gpio lines.
the NF is generated and sampled with in sum 3 soundcards.
every soundcard provides 2 input and 2 output channels (stereo).
So we drive for each band (2m, 70cm, 23cm) a soundcard.
The single mainboard with the 3 USB sound carsds is a embedded device
which consumes about 5-6W power. Everything running on 12V
So far about the hardware side.
On software side there is running some linux with "oe5dxl's afskmodem".
The naming 'afskmodem' is choosen a bit unhappy, since the modem is
more a multibaud monster which can operate up to 7 modems on a single
audio stream. So in theory we could operate 14 different baud and or
modes with a single stereo soundcard.
The "middleware" after the modem is AXUDP (v2) which then could be
easy connected to all the other stuff (pc/flexnet, aprs igate, aprs-
digi, ...).
At oe5xbl we have on a another embedded pc a instance of pc/flexnet32
for standard packet radio access running (linked with axudp to the
modems).
For aprs we use (also from oe5dxl) udpgate as i-gate and udpbox as aprs-digi.
best 73,
hannes - oe5hpm
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