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  1. Lab599
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No Power On Transmit

 

Hey everyone. Radio was working fine until another radios microphone fell on it. Screen got weird but I fixed that with help from US support but now when I transmit in SSB or Digital it shows NO power output in the meter and no recognition on PSKReporter.

Any suggestions to check on the radio? Settings? Or is it time to send it in to get repaired?
 

hook up a meter w/dummy load, send cw, or whistle to check?
 

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Yes I have tested with an MFJ Dummy Load and meter, showing no power whatsoever.

?

From: [email protected] <[email protected]> On Behalf Of kg4zqz
Sent: Sunday, January 22, 2023 09:29
To: [email protected]
Subject: Re: [Lab599] No Power On Transmit

?

hook up a meter w/dummy load, send cw, or whistle to check?

 

Okay a follow up. I disassembled the TX-500 and used a multimeter. I found there is a short between the CENTER PIN and GROUND on the BNC; both inside and out. Any suggestions on where to look to resolve this?
 

Remember a DC short across centre pin and ground is not an RF short.?

You mentioned a mic was dropped on the radio; are you sure it's hasn't just pressed a button and changed a menu setting?

73 de M3KXZ

On Mon, 23 Jan 2023, 14:57 Matt via , <mvanderhoff=[email protected]> wrote:
Okay a follow up. I disassembled the TX-500 and used a multimeter. I found there is a short between the CENTER PIN and GROUND on the BNC; both inside and out. Any suggestions on where to look to resolve this?

 

I did a factory reset on the radio to remove any doubt of a menu setting and still no power on transmit.?

From my understanding and based on my other radios there should be no short between the the ground and center pin on a transceiver. On antennas there can be but, unless I am wrong, there should not be a short on a transceiver.
 

You can not check like that.

On January 23, 2023 at 10:14 AM "Matt via groups.io" <mvanderhoff@...> wrote:

I did a factory reset on the radio to remove any doubt of a menu setting and still no power on transmit.?

From my understanding and based on my other radios there should be no short between the the ground and center pin on a transceiver. On antennas there can be but, unless I am wrong, there should not be a short on a transceiver.


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--
Cecil
W4CM
 

What should I check?
 

Hi Matt,

I just measured the BNC of the radio and it has a DC short, so this might not be the problem.

73 Stephan
 

Just checked mine and as I thought, a short across the BNC is correct.
M3KXZ

On Mon, 23 Jan 2023, 15:14 Matt via , <mvanderhoff=[email protected]> wrote:

I did a factory reset on the radio to remove any doubt of a menu setting and still no power on transmit.?

From my understanding and based on my other radios there should be no short between the the ground and center pin on a transceiver. On antennas there can be but, unless I am wrong, there should not be a short on a transceiver.
 

Thank you and Stephan. Good to know that is not the problem. Not to search for what is causing it to have no transmit power.
 

After doing factory reset, did you update to latest firmware too. Perhaps a weird combination of button pressed when you dropped the mic on it caused a glitch and the update might clear it.

Check also that it's not set to split and trying to tx out of band. Also check meter setting. Is it set to display power?

On Mon, 23 Jan 2023, 15:35 Matt via , <mvanderhoff=[email protected]> wrote:
Thank you and Stephan. Good to know that is not the problem. Not to search for what is causing it to have no transmit power.

 

Good idea but the only problem is I had the current update on the radio when I dropped it.

Will check for split.?

And also have it to display power output and even put it up to a dummy load with an PWR/SWR meter.

Let me put this back together and check for Split. I would assume resetting it would wipe that but it might be some weird combination that it didnt.
 

Sadly nothing... see pictures
 

The display says it's only receiving 10.0 VDC.? Is it possible that the voltage is so low the radio won't transmit?

- Trevor, N6TJL
 

¿ªÔÆÌåÓý

Have you tried using mike in ssb, AM mode or key in cw mode other than just the tone key feature?

-------- Original message --------
From: "Matt via groups.io" <mvanderhoff@...>
Date: 1/23/23 11:38 AM (GMT-05:00)
Subject: Re: [Lab599] No Power On Transmit

Sadly nothing... see pictures


--
Cecil
W4CM
 

Good eye. Let me switch to main power. Usually keep my shack running off battery and solar but we have snow today. I did run my FT-991A off of this same battery and made contacts both SSB and FT8 recently.

Will check though.

Thank you
 

I know the quick replies are stacking up here and no resolution yet. So, sorry for yet another. I typically run my LiPo for my TX500 down to 9V and have no issues with it. I hope you find the issue.

Joshua
KO4AWH
 

Thank you Joshua. Yes, I know i have been out doing POTA with my 3Ah LiPo battery and had it lower than 10.0V without any issues. I too hope I find the issue. Thank you
 

Same exact symptom on my unit.

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