[Elecraft] Voice is clipped K3s

[Jim Brown]

First, I don't think any Heil mic ought to be taken as a standard. I 
view Heil as most audio professionals view Bose -- "better sound through 
advertising."

Second, the SM58 is a single-D cardioid, and Shure's published data is 
for the mic at considerable distance from the sound source. When used 
close to a sound source, there is a LOT of bass boost as a result of 
proximity effect, so the "close-talked" response requires a lot more 
low-cut EQ.

Third, My standard recommended starting point for TXEQ for ALL mics is 
max cut of the three lowest bands, 6dB cut of the 4th (400 Hz) band.  
Some mics, including the Shure 444 and some Heil mics have an 
intentional boost around 3 kHz to compensate for the rolloff of SSB 
transmitting filters, and I view this as a GOOD thing. For mics that 
lack this boost, or have have the boost at a much higher frequency (the 
SM58 has a boost around 8 kHz), I recommend a boost of 3-6 dB in the top 
two bands. All other bands should be set "flat" (no boost, no cut).

After making these settings, adjust COMP to see about an indicated 10 dB 
of gain reduction on voice peaks, then get signal reports from a good 
listener.  These settings are for maximum talk power, NOT for high 
futility, and if done right, will multiply your effective power by about 
20 (13 dB). That will make you easier to copy on the other end, which, 
for me, also makes casual QSOs and ragchews easier on the ears when 
you're not booming in on the other end.

73, Jim K9YC



On 10/10/2018 11:07 AM, Joe Subich, W4TV wrote:
>
> If one has a flat "wide band" mic (electret) the typical TX EQ settings
> needed to emulate the Heil HC4 (DX)/HC5 elements, a couple classic
> "communications" mics and a typical dynamic "vocal" mic (SM58) are:
>
>                                   -- SHURE --
>            HC4     HC5    D-104   444    SM58
>    50      -16     -16     -16    -16      -8
>   100      -16     -16     -10    -16      -2
>   200      -16      -3      -4     -7       0
>   400       -4      -2      -3     -2      -1
>   800       -0      -2      -1      0      -1
>  1600       +5      +2      +3     +3      +0
>  2400      +10      +5      +9     +7      +1
>  3200      +10      +6     +13    +12      +4
>
> Thanks to: <https://owenduffy.net/audio/legend/index.htm> for the
> HC4/HC5/D-104/444 response curves.   The SM58 data comes from
> Shure's data sheet.
>
> 73,
>
>    ... Joe, W4TV
>
>
> On 2018-10-10 11:29 AM, Don Wilhelm wrote:
>>
>> As Bob K4TAX has pointed out and K9YC has long advocated, set the 
>> lower 2 bands of TX EQ to the lowest levels and set the 3rd band down 
>> a bit as well - that will increase your "talk power" while not 
>> wasting power trying to transmit those low frequencies which are not 
>> needed for intelligibility.  If you are into ESSB, you may differ, 
>> but ham radio is not HI-FI in my opinion, it is about communications 
>> effectiveness.
>>
>
> The typical
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