[DSP-10] CW transmit has a raspy sound

[ww2r at mgef.org]

I havent seen this issue with the "hot" mar 6's I am using

Dave

ww2r


> Hi Lee,
>
> I was hoping Bob might check in here again. The output stage U106 seems to
> be running saturated or very close to saturated. Maybe this is OK. I don't
> think the mixer cares if the power is 5 DB too high.
>
>  mar-4, 8.3 dbg, 1 db comp 12.5dbm
>
> I wonder about the first stage, U105. It drives the F_in of the
> synthesizer (U104,pin8) as well as the output stage.
>
>  mar-6, 20 dbg, 1 db comp +2 dbm,
>
> Working backwards through the numbers it seems the mar-4 would have to be
> driven by +4.2 dbm (2 db above the one db compression level) from the
> mar-6. For the mar-6 to put out that much power it would have to be
> seriously overdriven or biased for a lot of current.
>
> This doesn't seem correct. I'll have to read through the original article
> and see if there was any mention of drive and signal levels.
>
> There were a bunch of MAR-6 that found their way into the amateur
> community that are pretty hot. Something else to wonder about.
>
> 73 Mike KD7TS
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