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Author Topic: Heathkit DX100 w/D104 Bassy Audio  (Read 3467 times)
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W4KJP
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« on: July 26, 2018, 08:09:36 PM »

Hello looking for some assistance with my Heathkit DX100.  Lately I have been getting reports that my audio is so bassy that it is unintelligible.  I am only learning about these older tube radios so any help would be appreciated.   
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N1BCG
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« Reply #1 on: July 27, 2018, 01:31:15 PM »

A DX-100 with too many lows is a new one. Some more info would be helpful such as if the mic or transmitter has been modified. Is it an amplified or unamplified D-104? How close are you speaking to the mic?  A 6” distance will yield much less bass than close talking in many cases.
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W4KJP
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« Reply #2 on: July 28, 2018, 07:01:05 AM »

The only modification in the DX100 that I know of sure is that the rectifiers are solid state and the D104 is amplified.  I have used the radio for a few years now and never had any major trouble with it.  I did change out the battery in the mic but that didn't make a difference.
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Patrick J. / KD5OEI
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« Reply #3 on: July 28, 2018, 08:47:38 AM »

Even so, could there be a mismatch with the mike due to an out of spec component? Or maybe a bad part in the speech amp?
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N1BCG
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« Reply #4 on: July 28, 2018, 08:51:51 AM »

Do you have another microphone you could try? That would isolate the problem to either the D-104 or DX-100.

Power supply caps going bad can cause this by imposing 60Hz hum in the audio, giving the impression of bassiness and unintelligible audio. I haven't studied the audio circuit of that transmitter but it's also possible that a component has drifted out of tolerance.

Have you heard your audio either with a nearby receiver and the transmitter in a dummy load or by using an SDR where your signal is strong?
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KA2DZT
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« Reply #5 on: July 28, 2018, 09:26:21 AM »

You may have lost all the highs leaving only the bottom end.

Fred
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KD6VXI
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« Reply #6 on: July 28, 2018, 11:37:31 AM »

It's an amplified d104.  If they are bassy, it's typically a bad element, or a high quality operator stuffed a hand mic element into it.

My two pence worth.

--Shane
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W4KJP
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« Reply #7 on: July 30, 2018, 07:00:28 AM »

Thanks to everyone that replied! My audio trouble ended up being isolated to my HO-10 scope I had recently put back in line.  I didn't think it would cause audio trouble but once I removed it I stated receiving good audio reports again. 
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