[hpsdr] Echo on transmitted signal

[Graham / KE9H]

Did you turn VAC on, without setting it up correctly, then forget about it?

This happens when you turn on VAC, without setting it up, and the VAC 
defaults are
pointing at other audio paths in the computer (rather than at a PSK-31 
program
or similar, like it should.)

The buffers the signal go through are different latency, and if pointed 
at the audio
mixers in Windows, the audio can loop around, and you get the echo-delay 
effect.

Do not ask me how I know this.

--- Graham / KE9H

==

Warren C. Pratt wrote:
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>
>   
>
> ------------------------------------------------------------------------
>
> I finally had time to get my HPSDR rig on the air! I’m absolutely 
> delighted with the receiver and I’m now working the kinks out of 
> transmit. In running sideband, I have a slight echo on my transmitted 
> (and monitored) signal, i.e., the “concert hall” effect.
>
> Firmware: Ozy 1.7, Mercury 2.9, Penelope 1.2
>
> PowerSDR v1.19.3.1
>
> I have tried BOTH a computer with Windows XP/32bit and a computer with 
> Windows 7/64-bit. The same effect exists on both.
>
> I thought at one point it might be an RF feedback problem. However, I 
> now think not. I can hear the effect on monitor even with the drive 
> level reduced to zero. I believe the effect is the same independent of 
> drive level (it’s difficult to tell for sure when I’m monitoring my 
> own speech).
>
> I’ve tried a couple different microphones that I use on my Yaesu rig. 
> The effect exists on HPSDR but not on the Yaesu. So, I don’t think 
> it’s an acoustic effect in the room.
>
> Have I missed something in the settings, jumpers, or whatever? Any ideas?
>
> Thanks,
>
> Warren NR0V
>
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