[Elecraft] K3s SSB transmitting bandwidth?

[Michael Blake]

Thanks Don.  The published curves ( https://elecraft.com/pages/k3s-8-215-mhz-first-if-crystal-filter-response-curves <https://elecraft.com/pages/k3s-8-215-mhz-first-if-crystal-filter-response-curves> ) suggest that there will be significant low end rolloff below 300 Hz. But I have not taken the time or effort to attempt to measure it myself.  I believe that the ESSB improvements also require a wider filter to be totally effective.

The reason I ask is that when on-the-air testing of my new HyperX Cloud Pro headset there was not much change (none actually) noticed when I rolled 50Hz. And 100Hz. off to -16.

I thought that I had seen actually measurements of the actual rolloff in the past and thought that someone might recall where there were.

Very 73 - Mike - K9JRI


> On Dec 25, 2018, at 11:18 AM, Don Wilhelm <donwilh at embarqmail.com> wrote:
> 
> Michael,
> 
> I think the rolloff is not much (in support of those who want ESSB operation.  Much of the rolloff depends on your microphone.
> Jim Brown K9YC has long advocated reducing the TX EQ below 500 Hz or so in order to increase your effective communications power.  An improvement of 3 dB or more can be had by reducing the low frequency audio since those low frequencies take a lot of the total power and add little to communications effectiveness.
> 
> 73 and Merry Christmas,
> Don W3FPR
> 
> On 12/25/2018 11:03 AM, Michael Blake via Elecraft wrote:
>> When using the stock K3s 2.7 KHz. roofing filter and all TX EQ settings are zero (0) what is the normal TX audio rolloff below 300Hz.?