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Strange audio issue #qcx

 

Based upon advice from many helpful folks here, I decided to leave well enough alone on the low power issue and I have my QCX ready to go with a minor modification that added a momentary switch to the top of the case for use as a straight key. I have found one more problem that I’m not sure about.

Sometimes I find my QCX is “deaf” on receive and it requires me to tap the side of the rig to get it to “hear” signals. I also notice that tapping on the case gives a loud sound in my earphones and I also get a similar loud pop when I press the buttons. I’ve checked for loose connections and can’t find anything.?

Thoughts? Thanks!

Rob KT4RK?
 

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Hi Rob
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Is your QCX in a metal case? If so I may be able to shed some light as I had similar experiences, If it is not in a metal case then I don't have any solution for you!
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Cheers
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Ian G4GIR
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From: KT4RK
Sent: Sunday, April 7, 2019 7:00 PM
Subject: [QRPLabs] Strange audio issue #qcx
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Based upon advice from many helpful folks here, I decided to leave well enough alone on the low power issue and I have my QCX ready to go with a minor modification that added a momentary switch to the top of the case for use as a straight key. I have found one more problem that I’m not sure about.

Sometimes I find my QCX is “deaf” on receive and it requires me to tap the side of the rig to get it to “hear” signals. I also notice that tapping on the case gives a loud sound in my earphones and I also get a similar loud pop when I press the buttons. I’ve checked for loose connections and can’t find anything.

Thoughts? Thanks!

Rob KT4RK?

 

Yes, it’s in the Bamatech metal case.?
 

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Hi Rob
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Well my problem was that I got a crackle/scrathcy noise in the headphones as I pressed a button turned a knob or moved the antennae cable at the BNC socket.
I never had it go deaf though.
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I don’t know the Bamatech case but will check it out.
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My QCX’s are built into a case that I had to drill machine etc to suit all the sockets pots and bits.
The problem was that the hole in the right hand side of the case where the headphone socket protruded was only a few thou larger than the metal ring on the headphone socket.
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That ring doesn't appear to be grounded, so when ever the case touched the ring it induced the noise in the headphones.
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I got over the problem by increasing the hole size so it couldn't touch the case.
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I had this problem with 2 of my 3 QCX’s. The good one was a larger hole!!
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Hope this may help you.
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73
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Ian G4GIR

From: KT4RK
Sent: Sunday, April 7, 2019 7:30 PM
Subject: Re: [QRPLabs] Strange audio issue #qcx
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Yes, it’s in the Bamatech metal case.?

 

Sometimes I find my QCX is “deaf” on receive and it requires me to tap the side of the rig to get it to “hear” signals. I also notice that tapping on the case gives a loud sound in my earphones and I also get a similar loud pop when I press the buttons. I’ve checked for loose connections and can’t find anything.
Thoughts?
Rob,

Seems obvious, although not obvious.
Must be a bad connection, solder joint, fragment of wire/solder, something shorting together or on the metal? case..

73 Alan G4ZFQ
 

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Hi Rob
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Just looked at the Bamatech case and it looks like there is loads of room around the headphone connector, so guess that's not the problem, coincidentally the case is almost the same as the one I use but mine has a sloping top panel.
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Good Luck
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Ian G4GIR
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From: KT4RK
Sent: Sunday, April 7, 2019 7:30 PM
Subject: Re: [QRPLabs] Strange audio issue #qcx
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Yes, it’s in the Bamatech metal case.?

 

I agree, but I’ve checked it and checked it. I guess I’ll give it another once over.
 

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Try some freezer spray or a wooden cocktail stick to carefully prod connections.

On 07/04/2019 20:09, KT4RK wrote:

I agree, but I’ve checked it and checked it. I guess I’ll give it another once over.

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