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APRS DM 700 USER TIPS AND COMMENTS BY JIM BAUDO, N0UQZ |
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| Subject: Easy, Easy
SATGATES! From: Bob Bruninga <bruninga@usna.edu> Date: Wed, 8 May 2002 19:47:14 -0400 (EDT) X-Message-Number: 12 Here is how we can have some EASY satgates almost overnight to support worldwide distribution of UI digipeated packets via all of the ASTARS satellites (see ASTARS web page): Whenever you park your TM-D700 APRS mobile out doors, hit a PM as you leave. Your vehicle instantly becomes a SATGATE that is about as good as it gets! Here is how it works... 1) The 1/4 wave roof antenna with short coax will hear WELL (high passes) 2) With many of these, ignore the low ones, someone else gets 'em. 3) The TM-D700 does UI digipeating with call substitution 4) The digipeat is digipeated to 144.39 where it enters the normal APRS internet system! (assuming an IGate is within range of your vehicle) Thus, flip the switch when you leave your vehicle, and it just works! Here is how to set it up in one of your program memories (PM's): 1) Set a channel to receive the satelltie and XMIT on 144.39 2) Put "SGATE" in your APRS UIDIGI menu callsign list 3) Enable DIGIPEAT ON. 4) Put this in a PM so that you can also turn it OFF easliy too! This works perfectly for ISS, SAREX, PCSAT, and SAPPHIRE. (Not UO-22 which is at 9600 baud)... [and now Sapphire is INOP] *** NOTE *** This requires all USER packets to include SGATE,WIDE in their path such as: Via SPACE STATION: VIA ARISS,SGATE,WIDE Via PCsat: VIA W3ADO-1,SGATE,WIDE In general, adding SGATE,WIDE as a final hop is not a bad idea in all cases for anyone wanting to get into the internet to allow for just these kinds of one-hop forwarding of Space digipeated packets. I use this technique frequently at indoor demos to digipeat satellite packets from my car in the parking lot to indoor displays... But it does add 14 bytes of overhead to every packet... But if you want your packet to get to the inernet, it is good insurence... The only way to do this for UO-22 (at 9600) baud is to have an umbilical cord by your driveway and plug your D700 into your IGate PC everynight... Oh yes, also, the best antenna is a 19.25" whip on your vehicle roof to get good gain overhead. Few people run these basic antennas, but run 5/8th or other gain antennas. These put the gain on the horizon where it is useless most times for mobile satellite work... ALso, the 19.25" whip antenna in the center of your roof has great overhead pattern and gain for both 2m and UHF! SO it is great for UO-22 as well as the 2m birds... WB4APR@amsat.org, Bob |
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