[Elecraft] TX EQ on data modes

[Joe Subich, W4TV]

> I would also like to see separate (or even NO) EQ on RX/TX 
> for data modes. I often set up the RX EQ so SSB sounds good, 
> and then when I go back to PSK I see the waterfall is very 
> noisy and odd looking. Leigh/WA5ZNU

Agreed.  Both RX EQ and TX EQ should be mode specific at the 
minimum ... TX EQ should be both input and mode specific.  

After looking at the receiver response with broadband noise, 
I notice the 50 Hz adjustment of the RX EQ shows no effect
and 100 HZ has minimal impact.  For RX purposes it might be 
preferable to delete the 50 Hz bucket and add a control at 
4 KHz - particularly for those using the FM filter on AM. 

73, 

   ... Joe Subich, W4TV 
       microHAM America 
       http://www.microHAM-USA.com 
       http://groups.yahoo.com/group/microHAM 
       support at microham.com 
 


> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net 
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Leigh 
> L. Klotz, Jr.
> Sent: Thursday, April 17, 2008 11:23 AM
> To: Bill W5WVO
> Cc: elecraft at mailman.qth.net; K4IA at aol.com
> Subject: Re: [Elecraft] TX EQ on data modes
> 
> 
> I would also like to see separate (or even NO) EQ on RX/TX 
> for data modes. I often set up the RX EQ so SSB sounds good, 
> and then when I go back to 
> PSK I see the waterfall is very noisy and odd looking. Leigh/WA5ZNU
> 
> Bill W5WVO wrote:
> > No, but the K3 should have a mode memory so that particular EQ
> > settings (including OFF) remain with particular modes when changing 
> > back and forth. TX EQ can be potentially useful in equalizing the 
> > amplitudes of the four tones in FSK441 (used in high-speed meteor 
> > scatter) if the TX passband isn't quite flat. You might 
> even want to 
> > boost the high and low tones just a tad to compensate for 
> other guys' 
> > too-narrow passbands on RX...
> >
> > Bill W5WVO
> >
> > K4IA at aol.com wrote:
> >> I am not sure I like that  result.  Should the TX EQ (and for that 
> >> matter the RX EQ) be turned off  automatically in DATA A and AFSK 
> >> modes?
> >>
> >> k4ia
> >> Buck
> >> #101
> >>
> >> In a message dated 3/27/2008 1:29:17 P.M.  Eastern Daylight Time, 
> >> elecraft at astromag.co.uk writes: Tx EQ only applies to  modes where 
> >> audio is used to create the final transmission. So it 
> applies to  AM, 
> >> FM, SSB, DATA A and AFSK, but not FSK-D, PSK-D or  CW.
> >
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