Charles Greene wrote:
Hello,
I am trying to set up MixW with the SDR-1000. I have MixW v2.16b8
and SDR-1000 v 1.4.5BP7.
I have problems in both BPSK31 and CW. First BPSK31. I followed the
steps in Bob's paper exactly through figure 12. MixW receives
ok. On Transmit. the power level fluctuates between 0 and 20
watts. I have the TX gain set at 2 and the mike gain set at zero,
power set at 20 watts. If I increase the mike gain, the power
output increases but still fluctuates. When I set the TX gain at 1,
it fluctuates between 0 and 17 watts. The fluctuation can be
described as 1 sec on and 0.1 sec zero power. Measured with external
watt meter.
On CW, when I go to TX on Mix, the SDR-1000 goes key down.
TNX for your help.
73, Chas W1CG
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Re: PSK
I can't give perfect advise here, but I have made it work, more or less.
I have observed this fluxuation also. Try regular RTTY. If that is
solid in terms of output, PSK usually is OK in terms of communication.
I can't prove it, but the fluxuation appears to be associated with the
"space" character (ASCII code point 32).
Also, check to make sure none of the compression or compander settings
are enabled.
I have had much more success with version 1.4.1 and MixW because there
was a lot less going on in terms of SSB improvements! By 1.4.5 preview
7, the "digital" version of SSB should eliminate these problems, but I
simply haven't tried it yet. I would check and see if MixW's use of CAT
somehow took it out of the digital SSB settings, which you should be
using before bringing it up. Don't know how MixW could take the SDR out
of that, but getting all those compression/compander things shut off was
what kept me on 1.4.1 before preview 7.
Larry WO0Z
PS, if you get it working as far as this note advises, ask someone how
broad your signal is. Mine works (albeit I don't fully understand it),
but it seems to put out a low grade hash of some sort with a total
signal bandwidth of maybe 500 to 700 Hz. I don't know why this is. I
may have the Mic gain too high still. I had to reduce MIC to "33" to
get this far. There is a setting for MixW's audio output you may need
to fuss with. I have not.
