The mysterious "Check the PTT Switch" warning

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Piper
 

Posts: 4
Joined: 03 Oct 2022, 13:29

The mysterious "Check the PTT Switch" warning

Post by Piper »

From time to time my unit locks up and I see only this: "Check the PTT Switch". Then the radio ceases to function and nothing else can be done with it. So, I unplug the power, go do chores and let me frustration subside for half an hour and when I plug in, then things seem back to normal. This may or may not be related to an issue with the CW mode over-riding all other choices and sending Dahs constantly, requiring me to un-plug the power and wait. Is there a programming issue with these things or do I have a bad PTT switch on my supplier-built unit? Looking forward to any suggestions. Thanks!
NG1Y
 

Posts: 2
Joined: 01 Oct 2022, 18:42

Re: The mysterious "Check the PTT Switch" warning

Post by NG1Y »

Piper, I am having the same issue today. Did you ever resolve it? I sure hope this new little radio (only 4 days since the first power on) isn't dead.

\Jim. NG1Y
dl6sez
 

Posts: 399
Joined: 30 Dec 2021, 22:54

Re: The mysterious "Check the PTT Switch" warning

Post by dl6sez »

Hello OMs,

had this issue only, as far as i remember, with long key cable splitted for two paddles in parallel.
I have to say that i normally use my (tr)uSDX only for CW :)
(tr)uSDX has no stray RF protection on the PTT/Key(a) line, because it is also used for ISP Serial Clock.
My suggestion: if it is stray RF into the Mic/Key port due to "long" cabling here you could test to solve it by
use a clip ferrite or a torroid and put 2 to 3 windings of your Mic/Key cable on it
and/or adding a small SMD 10nF capacitor from Tip to Ground in your 3.5mm stereo plug.
Try it and crossing fingers that this solves your problem.

73 de Chris
Chris DL6SEZ, JN48XL near Ulm, Southern Germany
swl-jo21go
 

Posts: 5
Joined: 16 Oct 2022, 18:10

Re: The mysterious "Check the PTT Switch" warning

Post by swl-jo21go »

Hi all

I am having this problem too.
without anything attached.

It suddenly happenend while switching bands.
off coarse i did "check the PTT switch" :lol:
and i did check the push action off the encoder too as i was using that the moment it failed.

what triggers this message underhood ? a short somewhere ?

grt
DL2MAN
 

Posts: 706
Joined: 30 Dec 2021, 19:18
Contact:

Re: The mysterious "Check the PTT Switch" warning

Post by DL2MAN »

This is possibly a sensitivity issue of the microphone. Try to attach external Mic, so internal mic is disconnected.

73 Manuel; DL2MAN
swl-jo21go
 

Posts: 5
Joined: 16 Oct 2022, 18:10

Re: The mysterious "Check the PTT Switch" warning

Post by swl-jo21go »

Hi Manuel

Thanks for your reply.
i tried this but it did not help.
well I tried with a empty non soldered jackplug since i don't have a external mic.

i guess what you are saying is that the VOX could be triggerd by
the mic on startup ?

I get a very load howling sound for say 1s on startup.
and no relais are clicking which they normally do.

grt
Maurice PA3MVE <= since this week :D
Km4udx
 

Posts: 2
Joined: 02 Jan 2022, 21:37

Re: The mysterious "Check the PTT Switch" warning

Post by Km4udx »

I had a big blob of solder shorting against the 6 pin plug. Fix the blob, put tape over the board under the plug pins, and problem fixed.
swl-jo21go
 

Posts: 5
Joined: 16 Oct 2022, 18:10

Re: The mysterious "Check the PTT Switch" warning

Post by swl-jo21go »

Thanks for pointing out the 6pin

but unfortunatly i must consider my truSDX dead,

i removed the PTT switch the jack-chassis and the 6pin
with this in my opinion everything connected to PB5
but i am still measuring 0v at PB5/PIN17
if i look at PB4/PIN16 i measure high and i can make that low with my paddle.

i ruined the PCB in the desoldering proccess (i am not good at soldering)
to bad. maybe i buy another one later
Jack M
 

Posts: 2
Joined: 20 Aug 2023, 10:10

Re: The mysterious "Check the PTT Switch" warning

Post by Jack M »

NG1Y wrote: 27 Oct 2022, 17:22 Piper, I am having the same issue today. Did you ever resolve it? I sure hope this new little radio (only 4 days since the first power on) isn't dead.

\Jim. NG1Y
Jim,
Did you ever figure out what caused the "Check PTT/key" error? I hope you did. I am building a breadboard uSDX and grounding the PTT/key line (connected to my nano pin d13 doesn't do a thing.
Thanks, Jack in Colorado
WR9R
 

Posts: 1
Joined: 28 Aug 2023, 14:32

Re: The mysterious "Check the PTT Switch" warning

Post by WR9R »

I now have this problem as well. Went to use it today (and have used it many times before) and the speaker is howling, and it says "Check PTT Switch". Did anyone resolve this?
Looking at the schematic, it appears that the port pin is virtually unprotected from ESD. Perhaps the port pin is taking an ESD hit which fails it into a permanently low state.
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