Audio distortion. C1,C2, PCM3060 and Si570 get hot.

General discussion and support for the Peaberry SDR V1.

Re: Audio distortion. C1,C2, PCM3060 and Si570 get hot.

Postby pu2clr » Sat Dec 01, 2012 2:43 pm

Actually I am not sure. I tried to transmit with HDSDR. I used it with my Softrock RXTX without problem.
I tried to use the same approach with Peaberry and when I start transmiting I can hear a weak signal (carrier) in my receiver tuned at the same frequency. But this signal is too weak. That symtom is the same if I use CFGSR software and I press the PPT button on tab test functionality .
Last edited by pu2clr on Sat Dec 01, 2012 3:13 pm, edited 1 time in total.
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Re: Audio distortion. C1,C2, PCM3060 and Si570 get hot.

Postby pu2clr » Sat Dec 01, 2012 3:09 pm

Actually I am not sure. I tried to transmit with HDSDR. I used it with my Softrock RXTX without problem.
I tried to use the same approach with Peaberry and when I start transmitting.
I can hear a weak signal (carrier) in my receiver tuned at the same frequency.
But that carrier is too weak.
That symtom is the same if I use CFGSR software and I press the PPT button on tab test functionality .

Am I doing something wrong?

Well, I am keep tying.
I will appreciate if some one help me on my debugging.
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Re: Audio distortion. C1,C2, PCM3060 and Si570 get hot.

Postby AE9RB » Sat Dec 01, 2012 7:02 pm

The easiest thing to do is use an oscilloscope and follow the signal through the block diagram. Somewhere along the way you'll stop seeing it and have found the problem. If you're sure everything is set up right and the speakers work, the problem is likely in the RF amps.
73 David AE9RB
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Re: Audio distortion. C1,C2, PCM3060 and Si570 get hot.

Postby pu2clr » Mon Dec 03, 2012 6:34 pm

Well, I will try do that. But it will be difficult for me because I have not enough skill yet.
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Re: Audio distortion. C1,C2, PCM3060 and Si570 get hot.

Postby AE9RB » Tue Dec 04, 2012 5:40 pm

If you get stuck, just ask here for help with the next step. Most of the time these radios work on the first try, but when they don't you have an opportunity to learn.

First, we need to divide the problem between digital+software issues and the analog circuits. Does the radio draw more power when you turn on the transmitter?
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Re: Audio distortion. C1,C2, PCM3060 and Si570 get hot.

Postby pu2clr » Wed Dec 05, 2012 1:28 am

The current draw is 170mA during receiving and 260mA during transmitting.
I am using HDSDR on Windows 7.
The receiver is working very nice. Better than my receiver Degen 1121.
I can hear a small signal (carrier) in the receiver when I trigger the PTT. Speaking at the mic, I can see the graphical representation of my audio in HDSDR interface.

Thanks.
PU2CLR.
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Re: Audio distortion. C1,C2, PCM3060 and Si570 get hot.

Postby AE9RB » Wed Dec 05, 2012 1:56 am

Good. Next, transmit CW and measure VOUTL-, VOUTL+, VOUTR-, and VOUTR+. You need a scope, diode probe, or DMM that works with audio frequencies. The exact voltage depends on the software; between 1-5V.
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Re: Audio distortion. C1,C2, PCM3060 and Si570 get hot.

Postby pu2clr » Wed Dec 05, 2012 11:52 am

OK. So I have another problem.
The Peaberry circuit suggests a keyer function like an iambic. Am I right?
I tried set up a couple of push buttons to simulate paddles of a iambic.
So I selected CW mode and turned on the TX on HDSDR and tried to work with CW.
Nothing happened.
In this case I think that the problem is Software.
This same behavior happens with my Softrock RXTX that works fine in LSB/USB mode.
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Re: Audio distortion. C1,C2, PCM3060 and Si570 get hot.

Postby AE9RB » Wed Dec 05, 2012 5:23 pm

HDSDR uses the enter key to send morse code.
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Re: Audio distortion. C1,C2, PCM3060 and Si570 get hot.

Postby Ve7pke » Thu Jan 03, 2013 11:40 am

AE9RB wrote:Good. Next, transmit CW and measure VOUTL-, VOUTL+, VOUTR-, and VOUTR+. You need a scope, diode probe, or DMM that works with audio frequencies. The exact voltage depends on the software; between 1-5V.


David, what should we see? DC waveform, quadrature sine wave?
Seems I am at same point on my TX.
Drawing 260 ma and very weak output.
Thanks
Dave
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