Re: Mobile SatGate Issue
R. Patrick Ryan
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Hi again, Frank N3FLRPrematurely sent previous email, disregard last sentence of that email.
aj3u (AJ3U) had the following posted at one time on the subject
Re: TM-D700A SatGate
"Whenever I park my truck, I put the D700 on PM5 instead of turning it off in order to assist other users with APRS satellite operations. In this mode, the D700 receives APRS packets from ISS and PCSAT and digipeats them to 144.39 where they can be picked up by terrestrial SatGates for delivery to the APRS-IS. The terrestrial APRS frequency (144.39 in U.S.A.) is set on Band A (left side). I have enabled CTCSS with a PL of 67Hz, so it will mute the speaker without having to worry about touching the volume control. I have set this band to "M"edium power in order not to run my truck's battery down! I set the beacon rate to 30 minutes for the same reason. I also set the Dimmer to the lowest level. Side B (right side) is set to the ISS downlink 145.80. You can set this with either a memory channel or with the VFO. Set menu 3-I to A:TX B:RX. UIDIGI is enabled (menu 3-K) which turns the D700 into a digipeater. (UIDIGI configuration details below). When the ISS makes a pass overhead, packets are received on Band B and digipeated over to Band A. This takes care of ISS, but how can you get it to simultaneously monitor for PCSAT (NO-44) when it is on 145.825? The trick is to set the Call channel to 145.825 and then hold down the Call button (top left) to enable Call scan! The D700 scans between 145.80 and 145.825 and it is a very fast scan so it catches packets from both satellites! Another thing you want to do is set your Message Groups to "*" (menu 3-P) so that you receive all messages. When you come back to your vehicle, you will know that a satellite pass has occured because you will see all of the messages queued from the pass. You can also check the station list. If the majority of D700 users did this, it would dramatically increase the IGate coverage for APRS satellite users and could free up dedicated SatGate stations to move their monitoring to other satellites such as the PCSAT2 9.6k downlink. By setting this as a separate PM, it takes two button pushes to put the D700 in this mode without affecting your normal everyday operating PM. When you want to go back to normal operations it is just two keypresses - PM OFF. Quick and easy. So put those idle D700's to work!
UIDIGI configuration details for Mobile SatGate operations: To enable the D700 as a mobile SatGate, enable UIDIGI (menu 3-K). UIDIGI digipeating path (menu 3-L) is set to "SGATE, WIDE, RELAY". As long as an APRS satellite user includes SGATE as part of their path after the satellite digi, then they will take advantage of this type of setup. By checking stations on FindU, I have found that about 50% of users do this. I have noticed that some use WIDE and RELAY after the satellite part of the path, so that is why I also include them. The ideal path for an ISS digi user would be "ARISS,SGATE,WIDE2-2". This packet would be digi'd by the ISS, then picked up by a D700 SatGate, and digi'd onto 144.39 with the remaining path of WIDE2-2 which just about guarantees delivery to an IGate.
More to follow
On Tue, Aug 18, 2020 at 10:26 PM Patrick Ryan KC6VVT <kc6vvt@...> wrote: