[RTTY] Low Tones

[Joe Subich, W4TV]

For FSK and the K3 there is no advantage to either 
high or low tones.  The comments about AFSK and low 
tones are valid for any radio. 

73, 

   ... Joe, W4TV 
  

> -----Original Message-----
> From: rtty-bounces at contesting.com 
> [mailto:rtty-bounces at contesting.com] On Behalf Of Glenn Anderson
> Sent: Monday, March 01, 2010 10:11 PM
> To: 'Joe Subich, W4TV'; rtty at contesting.com
> Subject: Re: [RTTY] Low Tones
> 
> 
> I am using a K3 and FSK.
> 
> -----Original Message-----
> From: rtty-bounces at contesting.com 
> [mailto:rtty-bounces at contesting.com] On Behalf Of Joe Subich, W4TV
> Sent: Monday, March 01, 2010 3:01 PM
> To: wb5tuf at earthlink.net; rtty at contesting.com
> Subject: Re: [RTTY] Low Tones
> 
> 
> 
> Are you using FSK or AFSK?  For AFSK, using high tones (2125/2295) 
> places the tones such that any harmonics are eliminated by the 
> transmitter IF filter.  With low tones, harmonics caused by over- 
> driving the microphone circuits are within the transmit audio 
> passband and will be transmitted along with the desired tones. 
> 
> Many of the older transceivers were also limited to high tones 
> for narrow filters to work on receive. 
> 
> 73, 
> 
>    ... Joe, W4TV 
>  
> 
> 
> > -----Original Message-----
> > From: rtty-bounces at contesting.com
> > [mailto:rtty-bounces at contesting.com] On Behalf Of 
> wb5tuf at earthlink.net
> > Sent: Monday, March 01, 2010 2:53 PM
> > To: rtty at contesting.com
> > Subject: [RTTY] Low Tones
> > 
> > 
> > Other that operator preference, is there any advantage to
> > using high or low tones?
> > 
> 
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