<html><head></head><body><div class="ydpaf7d60ayahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div><div dir="ltr" data-setdir="false">In short, it would be a monumental task. What you might not be aware of is, prior to the first Kenwood D7 being shipped, EVERYONE was using a TNC and radio cabled together through in most case the speaker//mic jack of an HT or the mic and external speaker jack of a mobile. Some of us were starting to use radios with dedicated 6 pin mini DIN packet ports, but those have always been rare, even on higher end mobiles. That also required you to set the levels for both transmit (deviation) and receive. At 1200 baud, this can be done reasonably well just by ear. Even slightly off, it's forgivable and usually works.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">When you move to 9600, it's a whole different world. The TNC's double in price. You cannot simply use the mic/speaker connections. You have to directly modulate the transmitter and receive at a minimum has to come off the discriminator stage, prior to any filtering. Then adjustment is quiet precise and cannot be done by ear because while 1200/2200 Hz tones are audible to the human ear, 9600 baud sounds like static. You can't just adjust the audio from the front panel and call it "good enough". This added complexity of setup scares a lot of guys away from even trying it or get frustrated and give up.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">In Virginia, we had several setups where the VHF 1200 baud digipeaters were "backboned" by 9600 baud UHF links. I'm pretty sure they are all gone now, but it was pretty cool to see that up and working. Doesn't mean we can't do it again.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">My friend Remi VE2YAG and I are dusting off some ESP32 model designs now that we're thinking could potentially be good for 1200 and 9600 baud, but no promises just yet.</div><div><br></div><div class="ydpaf7d60asignature">Jason Rausch<div>www.ke4nyv.com</div></div></div>
<div><br></div><div><br></div>
</div><div id="yahoo_quoted_5963445104" class="yahoo_quoted">
<div style="font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;font-size:13px;color:#26282a;">
<div>
On Wednesday, February 16, 2022, 04:37:58 PM EST, Jonathan Delaney <kb3osp@gmail.com> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id="yiv2375689843"><div><div>
<div id="yiv2375689843compose-body-wrapper"><div><div style="font-family:-apple-system, BlinkMacSystemFont, Arial, sans-serif, Color UI UI;font-size:14px;">The discussion this past week has made me wonder on why APRS 9600 is not used. To my knowledge most if not all APRS mobile/ handheld
enabled radios have a TNC capable of 9600 bps however we still set them to 1200. Is this because most of the digis and igates still use 1200? What would it take to get everyone to change to 9600?</div><div style="font-family:-apple-system, BlinkMacSystemFont, Arial, sans-serif, Color UI UI;font-size:14px;"><br></div><div style="font-family:-apple-system, BlinkMacSystemFont, Arial, sans-serif, Color UI UI;font-size:14px;"> Jon KB3OSP</div></div><div><br></div><div id="yiv2375689843tmjah_g_1299">Get <a rel="nofollow noopener noreferrer" target="_blank" href="https://bluemail.me">BlueMail</a> for Desktop</div><br></div>
</div></div></div>_______________________________________________<br>aprssig mailing list<br><a ymailto="mailto:aprssig@lists.tapr.org" href="mailto:aprssig@lists.tapr.org">aprssig@lists.tapr.org</a><br><a href="http://lists.tapr.org/mailman/listinfo/aprssig_lists.tapr.org" target="_blank">http://lists.tapr.org/mailman/listinfo/aprssig_lists.tapr.org</a><br></div>
</div>
</div></body></html>