Re: New TinyTrak Group Member 8000FA Questions.

Stephen Grob All Messages By This Member #1800 开云体育 I used the diagram you speak of just to get the info on the GPS wire colors. You are right - it confused me too. So I re-soldered the GPS wires using the green wire (GPS TX) on pin 2 of the DE9F which connects to pin 2 (RX) on the mt8k DE9M. It worked! I saw the LED on the GPS puck light up and blink on and off, And the green LED on the mt8k lights up and blinks on and off too. I installed the mt8k in the test vehicle and drove my test course. I saw aprs status messages on the TMD710GA with the remark “Moving” and distance and direction info also so the GPS is working. The TMD710GA screen showed that the mt8k was transmitting position reports about every 120 secs as configured and the distance was always about a mile away and direction was behind the vehicle. Unfortunately ?only showed one position report. I’m assuming this is due to the low transmit power and lack of close by digipeaters in our area. The one position report shown on aprs.fi is at the point during my test course that is closest to the Digipeater. Next test I will circle the Digipeater and try to stay within 1 mile of it. Thanks to Allen, Rob and Rich for all the help. You guys are the best. 73 Steve KD9AER toggle quoted message Show quoted text On Apr 29, 2023, at 7:31 AM, Rob Giuliano via groups.io <kb8rco@...> wrote: When I look at the website diagram, I see the explanation to be confusing. What are they telling you about the pins on which connector?? The Green TX pin from the GPS will connect to the RX pin of the device. ? So is Green the TX pin or the TX wire with respect to the GPS? ? On the DE9F (female pins), pin 2 is RX, so connects to the GPS WHITE TX pin. ? On the DE9F (female pins), pin 3 is TX, so connects to the GPS GREEN RX pin. ? So the connection is made directly (no intermediate cable to swap 2 & 3. <1682771192566blob.jpg> Robert Giuliano KB8RCO On Friday, April 28, 2023 at 09:56:25 PM EDT, Stephen Grob via groups.io <sgrob@...> wrote: Thanks for the tip on non-MIC-E. I will disable that and SB. My GPS BR355 does not have a connector on it. Only wires - Green, White, Red and Black. So I soldered the wires to a DE9F accordingly. Here is where I got the pin-outs:

In the schematic this website it shows White as TX and Green as RX - opposite from what Robs website says. I will disconnect the White wire and connect the Green wire and try again. I don’t see an LED on the GPS puck but there may be one there hiding under the “GPS” label characters. Also I will know the wiring is correct when I see the Green LED on the mt8k light up and stay on.

Thanks for all the great information.

Steve

KD9AER

On Apr 28, 2023, at 6:54 PM, Rob Giuliano via groups.io <kb8rco@...> wrote:

First, I agree with Allen - set a fixed TX rate (non-SmartBeaconing), non-Mic-E and decode it locally from another radio - if possible.

Main website I looked at:

HOWEVER, since you need whatever interface cable to the MT8k, you should still find a way to verify the RS232 output from the GPS in a PC terminal?
?? A quick search on GPS BR355 shows a module with a 6-pin miniDIN. Is that how yours is configured?
?? If this is a 6-pin MiniDIN (according to the couple of websites) pins 1 (Gnd) & 2 (V+) are used to power the GPS puck.
????? I didn't find any reference to Data lines (in or out)
? ? ? The sites reference an optional (additional) PS-2 to RS232 adapter.? Are you using it, or did you make your own?
? ? ?? ? The BR-355S4(5Hz) uses a proprietary pin-out on the PS2, which cannot be connected directly to any laptop or PC without the use of a cable set (USB or RS232 + PS2 for power).

From your description of your setup, are you sure the GPS has a fix (BR355 says it has an LED indication of fix)?

According to this site:
?? Green is TX from the GPS (output to attached device) and White is RX to the GPS (input from attached device).

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Re: New TinyTrak Group Member 8000FA Questions.

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