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Re: X5105 CW Mode Transmit Intermittent


 

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Hi JP and group,

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Issue resolved. JP, thank you for indicating the direction of my troubleshooting. Late Saturday evening I attempted to remove the back cover by loosening the 4 screws. To my amazement, all 4 philips-head screws were LOOSE! I simply tightened them and then checked ALL of the case screws and found the micro allen-head screws in top and bottom panels also loose. Lastly, the chrome nut that holds the BNC connector was also not snug and took another ? of a turn to fully tighten.

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When I was done with that mechanical adjusting, I setup the rig with antenna and key and voila!, it began transmitting again. However, now I noticed that I had about 15% more power and the external tuner was not nearly as sensitive to tune for min SWR. I would even say that receive is more sensitive.

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Now, 5 QSOs and 4 hours later of operation, the rig runs consistently with no power disruptions. I also operated at min internal battery, about 11.5 VDC and max external input, about 13.5 VDC and rig is consistent in performance. I believe the issue is fixed.

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If anyone experiences weird performance and intermittent transmit, first try tightening all of the case screws and BNC nut to ensure good grounds all the way around.

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Best 73, Lou N2JPR

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From: JP McGinley
Sent: Saturday, September 9, 2023 7:09 PM
To: [email protected]
Subject: Re: [X5105-Users] X5105 CW Mode Transmit Intermittent

Lou,
? I did not improve per se, I merely tightened the screws
?holding the brass standoffs with screw stick & needle nose pliers. The standoffs are knurled so easy to grip. I did need use a pair of curved hemostats to hold ?two of them still so I could remove the cover, as they were so loose it just spun without loosening. Be gentle with the really small power plugs and one other plug which I cannot recall, take pictures so you get everything oriented properly.?

Sent from for Windows

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From: Lou N2JPR via groups.io
Sent: Saturday, September 9, 2023 6:53 PM
To: [email protected]
Subject: Re: [X5105-Users] X5105 CW Mode Transmit Intermittent

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Hi JP,

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Great question! Yes, I did change the mode and key down but, quite honestly, thought that the programming of the rig would prevent output in those modes when keying the rig as the primary modulation driver is audio/mic.

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No, I did not get power out in FM, AM, or SSB but again, thought that was the rig¡¯s logic. I am more interested in understanding how you improved the standoff grounding and may contact you off-line. Thanks for your response.

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Best 73, Lou N2JPR

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Sent from for Windows

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From: JP McGinley
Sent: Saturday, September 9, 2023 9:21 AM
To: [email protected]
Subject: Re: [X5105-Users] X5105 CW Mode Transmit Intermittent

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Lou,
? Have you tried switching mode to FM and keying microphone to see if it¡¯s a CW only issue? I ask only because I had similar issue & it ended up being traced to the loose brass board standoffs depriving grounds to the boards. Mine had similar symptoms and finally dropped output to zero. If you do disassemble the rig, be VERY?
careful when removing the sides with the kickstand legs.
There are tiny springs which can fly and disappear, I placed a small piece of electric tape over the spring slot to keep spring in place for all eternity.

Hope this helps
JP
KA3BWP?

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