<html><head></head><body><div style="color:#000; background-color:#fff; font-family:Courier New, courier, monaco, monospace, sans-serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1485429166772_21196" dir="ltr"><span>My particular need is for a time-hardened installation at a location that is not easily accessible once installed. I will be able to use DTMF to power-cycle if pressed, but 24/7/365/forever operation is the expectation.</span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1485429166772_21361"><span><br></span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1485429166772_21360"><span id="yui_3_16_0_ym19_1_1485429166772_21359">Has such operation been demonstrated (no "memory leaks") with any computer-as-a-controller solution?</span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1485429166772_21358"><span><br></span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1485429166772_21357"><span>Ev</span></div><div dir="ltr" id="yui_3_16_0_ym19_1_1485429166772_21356"><span></span><br></div><div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" id="yui_3_16_0_ym19_1_1485429166772_21206" style="display: block;"> <div style="font-family: Courier New, courier, monaco, monospace, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1485429166772_21205"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_ym19_1_1485429166772_21204"> <div dir="ltr" id="yui_3_16_0_ym19_1_1485429166772_21203"> <font id="yui_3_16_0_ym19_1_1485429166772_21202" size="2" face="Arial"> <hr size="1"> <b><span style="font-weight:bold;">From:</span></b> Kenneth Finnegan <kennethfinnegan2007@gmail.com><br> <b><span style="font-weight: bold;">To:</span></b> TAPR APRS Mailing List <aprssig@tapr.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Wednesday, January 25, 2017 4:59 PM<br> <b><span style="font-weight: bold;">Subject:</span></b> Re: [aprssig] 2 Port Digitpeater was: APRS UHF freq? (9600 baud)<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_ym19_1_1485429166772_21209"><br><div id="yiv8652853082"><div id="yui_3_16_0_ym19_1_1485429166772_21208"><div dir="ltr" id="yui_3_16_0_ym19_1_1485429166772_21207">Agreed; we really shouldn't be setting up null-cable KISS crossbands for APRS these days. Between Direwolf for its own modem and Aprx for other KISS TNCs both having multi-port digi support, and single board computers / MicroITX industrial PCs being so cheap, you can set up very intelligent cross-band digi for not much more than the rest of the system expenses..</div><div class="yiv8652853082gmail_extra" id="yui_3_16_0_ym19_1_1485429166772_21379"><br clear="all"><div id="yui_3_16_0_ym19_1_1485429166772_21381"><div class="yiv8652853082gmail_signature" id="yui_3_16_0_ym19_1_1485429166772_21380">--<br clear="none">Kenneth Finnegan<br clear="none"><a rel="nofollow" shape="rect" target="_blank" href="http://blog.thelifeofkenneth.com/" id="yui_3_16_0_ym19_1_1485429166772_21382">http://blog.thelifeofkenneth.com/</a></div></div>
<br clear="none"><div class="yiv8652853082yqt2939115785" id="yiv8652853082yqt18025"><div class="yiv8652853082gmail_quote" id="yui_3_16_0_ym19_1_1485429166772_21383">On Wed, Jan 25, 2017 at 8:40 AM, John Langner WB2OSZ <span dir="ltr"><<a rel="nofollow" shape="rect" ymailto="mailto:wb2osz@comcast.net" target="_blank" href="mailto:wb2osz@comcast.net">wb2osz@comcast.net</a>></span> wrote:<br clear="none"><blockquote class="yiv8652853082gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><br clear="none">
> Has anybody actually succeeded in putting two KISS TNC's "back to<br clear="none">
> back" to form an independently operating (no computer between them)<br clear="none">
> two-way "bridge" to pass traffic bi-directionally?<br clear="none">
> Lots of suggesting that this could work, but has it been done?<br clear="none">
<br clear="none">
In theory it should work but it's not a proper solution to the problem.<br clear="none">
Here is why.<br clear="none">
<br clear="none">
When a packet is first transmitted, the via path contains information on how<br clear="none">
it might be forwarded by digipeaters.<br clear="none">
<br clear="none">
Each time a digipeater retransmits a packet, it modifies the via path to<br clear="none">
decrease the number of possible remaining digipeater hops. This limits the<br clear="none">
number of times it can be retransmitted.<br clear="none">
<br clear="none">
If you were to simply retransmit what you hear on one frequency onto some<br clear="none">
other frequency, that would be OK if only one person was doing it. However,<br clear="none">
if you had two stations like this, that could hear each other, the same<br clear="none">
packet could go bouncing back and forth forever.<br clear="none">
<br clear="none">
To do it properly you would want to put an application between the two TNCs<br clear="none">
to perform digipeating by the normal rules. There are countless digipeater<br clear="none">
implementations out there but I'm not sure how many of them can handle<br clear="none">
multiple radio channels at the same time.<br clear="none">
<br clear="none">
The "direwolf" software TNC can handle up to 6 radios at the same time and<br clear="none">
has the ability to digipeat between different channels in any combination.<br clear="none">
Run it on a Raspberry Pi and you have something smaller and cheaper than a<br clear="none">
stack of old TNCs, with better receive decoding, and vastly more<br clear="none">
versatility.<br clear="none">
<br clear="none">
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</blockquote></div></div><br clear="none"></div></div></div><br><div class="yqt2939115785" id="yqt01522">_______________________________________________<br clear="none">aprssig mailing list<br clear="none"><a shape="rect" ymailto="mailto:aprssig@tapr.org" href="mailto:aprssig@tapr.org">aprssig@tapr.org</a><br clear="none"><a shape="rect" href="http://www.tapr.org/mailman/listinfo/aprssig" target="_blank">http://www.tapr.org/mailman/listinfo/aprssig</a><br clear="none"></div><br><br></div> </div> </div> </div></div></body></html>