[Elecraft] Adapter for use between iPhone headset and a KX2/KX3

[Wayne Burdick]

The numeric value is a relative indication generated by the math we use in our algorithm; it’s not actually an attempt to quantify compression in dB. Multiple factors including power level, ALC level, and mic gain setting are taken into account. I’ll dig up the full details of the implementation when I get a chance. 

Meanwhile (anecdotally): at any setting the compression is very clean, and at the high end it greatly increases the “punchiness” of the signal.

Wayne
N6KR


> On Jul 3, 2018, at 10:14 AM, Jim Brown <jim at audiosystemsgroup.com> wrote:
> 
> On 7/2/2018 5:23 PM, Wayne Burdick wrote:
>> I generally leave TX CMP at 20, but even at 30, the audio is very clean. The extra punch can help with QRP and/or small antennas.
> 
> Hi Wayne,
> 
> You're looking at the wrong thing to set compression, because the numeric value doesn't take the mic sensitivity into account. Rather, we should be looking at the indicated gain reduction on audio peaks, and 10 dB is a good objective.
> 
> As an audio pro, my advice is 1) set TXEQ so that you're not wasting power transmitting low frequency speech sounds (max cut for the first three bands, 6 dB cut for the fourth)  2) Set CMP for the indicated value of gain reduction  3) Get some signal reports from a good listener. This combination results in about 13 dB of increased talk power (3 dB for the EQ, 10 for CMP).
> 
> 73, Jim K9YC
> 
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