[Elecraft] K3 noise reduction

[Alexandr Kobranov]

The best way is to try and check power levels on all tones used in 
WSJT mode. In my case the playing with TxEQ help to compensate lover 
signal level from SoundCard at low tones. As such signals are driving 
mostly some VHF transverter system with some QRO PA which is during 
1min period in 100% duty mode (like in FM mode), there is need to 
carefully check power level going out (drive level) to prevent some 
bad things :-(
(mostly power shoud be reduced below nominal like in rtty or fm)
As such setting is strongly dependent on soundcard type and settings 
there is no simple recommendation. One has to know what he is doing - 
but this is general rule with K3 :-)
Maybe TxEQ and RxEQ will be accesible by external utility and profile 
will be possible to save/recall.
73!
L. -dst-
K3/10 #727



Lyle Johnson napsal(a):
>> Surely there is need for TxEQ - for example with WSJT mode to 
>> compensate different levels from souncard and possible filter 
>> influence for all tones to set equal power-out.
> 
> The TxEQ adjustment frequencies are set for voice operation.  They are 
> the same setpoints as used in the W2IHY 8-band EQ.
> 
> They are probably not in the right places to compensate for whatever 
> ripple might be in the subsequent crystal filters in the Tx Path.  Also, 
> such compensation would change with USB/LSB operation, and is not easily 
> observable by the operator of the Tx, so might not be straightforward to 
> set properly.
> 
> Any mode that is designed for robust, or weak signal, HF data operation 
> should have allowance for slight amplitude and phase variations, since 
> that is a normal part of HF signal propagation.
> 
>> I do not remember if TxEQ settings is stored via mode or not.
> 
> They are not, nor are Rx EQ settings, at present.
> 
> 73,
> 
> Lyle KK7P
> 
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