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MTT4BT will not boot up if the USB 2.5 cable is plugged in. If i unplug from computer. It boots up immediately. If i unplug from the MTT4BT, it also boots immediately.
Everything was working fine this morning, now not.
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What is a USB 2.5 cable?? Are you referring to the 2.5mm jack for PortA?
Sounds like a wiring issue - possibly ground.
I am not familiar with the MTT4BT.? I have the MTT4B that I added my own Bluetooth module to. The MTT4B has 2 ports: ? MiniDIN with 6-pins (PS2 keyboard style) => PortB with RF module power and 5V out for GPS.
? TRS style 2.5 mm jack. What cables are you using? ? Home made, or Byonics purchased?
On Friday, July 16, 2021, 8:23:28 PM EDT, <toy4trax@...> wrote:
I had everything working on the bench, went to install on the vehicle and now not....
Back to the bench- MTT4BT will not power up if the USB 2.5 cable is plugged in to either the A port, or USB port.
MTT4BT is being powered from the DB9 cable(not the pins themselves) just the 12v leads.
Verified i'm getting 12v at the source.
Powers up just fine if the USB cable is unplugged from the MTT4BT
Powers up just fine if the USB cable is unplugged from the computer.
Lights-
Boot sequence is good.
Red light stays on
When packet is received, I can hear a relay click, lights indicate normal operation, and digi.
Can't get into programming mode at all now...
What to do?
-Brian
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It is the cable from Byonics, second one down:
Has the MiniDIN and PortB as you described.
PortA uses the 2.5mm jack, PortB is the MiniDin split to DB-9 and Power provided with the MTT4BT
Cables are from Byonics.
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When you say second one down, are you referring to the page, or the second computer interface with 2.5mm jack?
I think you are using the 2.5mm Jack, which is the same as the BT module.?
Are you changing the jumpers to disable the Bluetooth? The module has 3 possible configurations: ??? PortA using 2.5mm jack?????????? (J4 & J5 top jumpered)
??? PortA for BT commincation????? (J4 bottom & J6 top jumpered) ??? PortA disabled and 2.5mm jack is fro configuring the BT module (J5, J6 bottom & J7 horizontal jumpered)
Does the MiniDIN use both 5 & 6 pins for ground to the DE9?
On Saturday, July 17, 2021, 1:42:00 AM EDT, toy4trax@... <toy4trax@...> wrote:
It is the cable from Byonics, second one down:
Has the MiniDIN and PortB as you described.
PortA uses the 2.5mm jack, PortB is the MiniDin split to DB-9 and Power provided with the MTT4BT
Cables are from Byonics.
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- Yes, second interface to the computer with the 2.5mm jack.
Yes, Jumpers set j4,j5 top jumpered.?
MiniDin-
- Cable side- Ground at 5 but not 6.
- Board side- The bottom two have continuity (yellow arrows in pic)
 Looking at the board deeper the component at D6(left side under DIN connector) looks cooked?   How? Why?
?
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D6 is the main input to the RF amplifier.
On Saturday, July 17, 2021, 1:30:10 PM EDT, toy4trax@... <toy4trax@...> wrote:
Yes, second interface to the computer with the 2.5mm jack. Yes, Jumpers set j4,j5 top jumpered.? MiniDin-
- Cable side- Ground at 5 but not 6.
- Board side- The bottom two have continuity (yellow arrows in pic)
 Looking at the board deeper the component at D6(left side under DIN connector) looks cooked?   How? Why?
?
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If D6 is blown out, you won't have any power to the amplifier circuit, including the T/R relay. The diode is rated for a surge rating of 9 Amperes. You can check the circuit by measuring the DC input on the amplifier module, third pin from the left. If the diode is blown, the mostly likely thing is that the amplifier was locked into the transmit-mode. This can happen because of a high SWR ( You MUST use a good antenna...not a rubber duck, etc or turn the power way down or off using the blue trimmer potentiometer, or by operating into a dummy load) or by intentionally causing an extended transmission via a command?line instruction.(CALIBRATE) D6 protect the amplifier?stage, but the low voltage?stage can remain functional with the power out to the final amplifier.?
73,
Allen AF6OF
D6 is the main input to the RF amplifier.
Yes, second interface to the computer with the 2.5mm jack. Yes, Jumpers set j4,j5 top jumpered.? MiniDin-
- Cable side- Ground at 5 but not 6.
- Board side- The bottom two have continuity (yellow arrows in pic)
 Looking at the board deeper the component at D6(left side under DIN connector) looks cooked?   How? Why?
?
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Allen,
???? Thanks. I have been using the V3 "Hershey Kiss" antenna that Byonics sells: Nagoya UT-108UV.
The antenna is placed on a piece of sheet metal for ground plane.
Have not touched the blue potentiometers inside either.
Any reason this would impact the unit not powering up when the 2.5mm connector is plugged in/connected to the computer?
Honestly I'm feeling like I got a bum unit here. All power sources have been fused, no fooling around in the programming, ect.
For the test, I assume the amplifier is the silver rectangle on the right-hand side in my pic below?
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The amplifier is the black widget mounted to the board with screws, above the metal can. ( The RF module)? Other than a really awful short circuit of some kind, it's unlikely the 2.5mm serial port jack could prevent the unit from powering up. I suggest you send me your MTT4BT, power/serial cable. and USB-2.5 cable, and I will check everything out and do my best to make them run according to Hoyle! My shipping address is:
VHS
1370 Trancas?Street, Suite 201
Napa, CA 94558
73,
Allen
-----Original Message-----
From: toy4trax@...
To: [email protected]
Sent: Sat, Jul 17, 2021 3:00 pm
Subject: Re: [TinyTrak] MTT4BT- Will not power with USB 2.5 Cable plugged in.
Allen,
???? Thanks. I have been using the V3 "Hershey Kiss" antenna that Byonics sells: Nagoya UT-108UV.
The antenna is placed on a piece of sheet metal for ground plane.
Have not touched the blue potentiometers inside either.
Any reason this would impact the unit not powering up when the 2.5mm connector is plugged in/connected to the computer?
Honestly I'm feeling like I got a bum unit here. All power sources have been fused, no fooling around in the programming, ect.
For the test, I assume the amplifier is the silver rectangle on the right-hand side in my pic below?
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Allen,
Very much appreciate your offer. I'll get it out to you next week!
The odds that the issue is my fault is much higher, than it being a lemon. I did my due diligence at each step to prevent magic smoke, so I definitely appreciate an expert taking a look.
-Brian
KG7KHL
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Brian,
Well, we do our best not to send out units that are bad right out of production :) I look forward to getting your unit and I will make sure it is ship-shape and Bristol fashion.?
73,
Allen
Allen,
Very much appreciate your offer. I'll get it out to you next week!
The odds that the issue is my fault is much higher, than it being a lemon. I did my due diligence at each step to prevent magic smoke, so I definitely appreciate an expert taking a look.
-Brian
KG7KHL
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Brian,
I received your MTT4BT today. It appears that the corruption of the TT4 ATMEGA controller stemmed from the 2.5mm PORTA jack getting a bit bent and having intermittent contact. The programming cable probably just got tugged a bit too hard. Anyway, I replaced the TT4 chip and the jack and all is well. I had it on the air a few minutes ago ( Your Call sign) and it is sending positions and digipeating. I will be sending it back tomorrow. Sorry about the difficulties!?
73,
Allen AF6OF
-----Original Message-----
From: Allen Lord <allen@...>
To: [email protected] Group Moderators < [email protected]>
Sent: Sat, Jul 17, 2021 5:42 pm
Subject: Re: [TinyTrak] MTT4BT- Will not power with USB 2.5 Cable plugged in.
Brian,
Well, we do our best not to send out units that are bad right out of production :) I look forward to getting your unit and I will make sure it is ship-shape and Bristol fashion.?
73,
Allen
Allen,
Very much appreciate your offer. I'll get it out to you next week!
The odds that the issue is my fault is much higher, than it being a lemon. I did my due diligence at each step to prevent magic smoke, so I definitely appreciate an expert taking a look.
-Brian
KG7KHL
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Thank you for the research and fix! ?
Looking forward to moving forward with my project.?
?
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