[RTTY] INRAD filter question

Sun Sep 26 10:05:19 PDT 2010

Daivd,

Check this post on my blog.  It should be helpful for a circuit to generate
FSK via USB.

73 de Al, KE1FO

K3 #3055
K3 #4094
-----
Check out my Amateur Radio Contesting blog at ke1fo.wordpress.com.

On Sun, Sep 26, 2010 at 11:11 AM, David VE3VID <ve3vid at hotmail.com> wrote:

>
> Confusion is clearing a bit, check my thinking on this..................
>  The 400hz filters are listening over a portion of the band away from the
> section where the mark and space tones will be heard.  So the reason it
> sounds so beautifully quiet is because I'm listening to the null outside the
> filters bandpass.  Yes?
>
> The TS-450 has a +/-2.2Khz IF shift.  This may not be quite enough to get
> the RTTY signal inside the passband.   The 450 also has a menu option to
> change the receiver tone from 2125 to 1275hz.  This may be irrelevant though
> as it is for FSK mode.
>
>
>
> I'll be back in the op chair this afternoon and give these options a try
> then get back to the email thread.   PLAN-B  if this fails,  is there a
> simple & inexpensive interface that I can use to do true FSK.  USB to 13pin
> DIN...........??
>
>
>
> David
>
>
>
>
>
>
> > Date: Sat, 25 Sep 2010 23:00:31 -0400
> > From: lists at subich.com
> > To: rtty at contesting.com
> > Subject: Re: [RTTY] INRAD filter question
> >
> >
> > > Okay, so you think if I adjust my IF shift it will help?
> >
> > If the IF shift has enough range it will work. Find a "dead"
> > place on the band, select the narrow filers and turn the IF
> > shift one way or the other to the stops and see if you hear
> > noise come up.
> >
> > 73,
> >
> > ... Joe, W4TV
> >
> > On 9/25/2010 10:39 PM, David VE3VID wrote:
> > >
> > > Okay, so you think if I adjust my IF shift it will help?
> > >
> > >
> > >
> > > When I click either filter in its like a dead band as I tune along.
> Like a 60db attenuator is on.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >> From: w7ry at inbox.com
> > >> To: ve3vid at hotmail.com; rtty at contesting.com
> > >> Subject: Re: [RTTY] INRAD filter question
> > >> Date: Sat, 25 Sep 2010 19:14:30 -0700
> > >>
> > >> you can probably use the BPF and IF shift to center LSB into the
> filters
> > >> passband. Then you will have to use 2125/2295 for tones.
> > >>
> > >> 73
> > >> Jim w7RY
> > >>
> > >>
> > >> --------------------------------------------------
> > >> From: "David VE3VID"<ve3vid at hotmail.com>
> > >> Sent: Saturday, September 25, 2010 7:06 PM
> > >> To: "RTTY contest group"<rtty at contesting.com>
> > >> Subject: Re: [RTTY] INRAD filter question
> > >>
> > >>>
> > >>>
> > >>> The laptop is a Gateway running XP, N1MM, into a SignaLink USB
> outboard
> > >>> sound card, into the ACC port on the TS-450s. I am neither for or
> > >>> against true FSK, just the SignaLink allows me to do many other types
> of
> > >>> "sound card" digital modes such as PSK and Olivia.
> > >>>
> > >>>
> > >>>
> > >>> I was able to do RTTY no problem with the system before the 400hz
> filters
> > >>>
> > >>>
> > >>>
> > >>>
> > >>>
> > >>>> From: w7ry at inbox.com
> > >>>> To: ve3vid at hotmail.com; rtty at contesting.com
> > >>>> Date: Sat, 25 Sep 2010 18:52:16 -0700
> > >>>> Subject: Re: [RTTY] INRAD filter question
> > >>>>
> > >>>> FSK is MUCH better than AFSK.... What are you using for a computer
> and
> > >>>> software? I use windows XP and MMTTY with N1MM. Works just fine in
> FSK
> > >>>> mode.
> > >>>>
> > >>>> Is there a particular reason you don't want to run FSK?
> > >>>>
> > >>>> 73
> > >>>> Jim W7RY
> > >>>>
> > >>>>
> > >>>> --------------------------------------------------
> > >>>> From: "David VE3VID"<ve3vid at hotmail.com>
> > >>>> Sent: Saturday, September 25, 2010 6:48 PM
> > >>>> To: "RTTY contest group"<rtty at contesting.com>
> > >>>> Subject: Re: [RTTY] INRAD filter question
> > >>>>
> > >>>>>
> > >>>>> Wow. Well if thats the case it was an expensive waste of $300.
> > >>>>>
> > >>>>> However, why would the filters be unusable in AFSK(LSB)? Dont they
> just
> > >>>>> narrow the IF bandpass to 400hz?
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>>
> > >>>>>> From: w7why at frontier.com
> > >>>>>> To: rtty at contesting.com
> > >>>>>> Date: Sat, 25 Sep 2010 18:43:48 -0700
> > >>>>>> Subject: Re: [RTTY] INRAD filter question
> > >>>>>>
> > >>>>>> Hi David
> > >>>>>>
> > >>>>>> I have the same setup as you--2 Inrad filters. They won't work in
> > >>>>>> AFSK.
> > >>>>>> You have to run FSK to use the narrow CW filters. 73
> > >>>>>> Tom W7WHY
> > >>>>>>
> > >>>>>>
> > >>>>>>>
> > >>>>>>> Ummmm.......nope. I had the rig in LSB (AFSK). And the tone pair
> as
> > >>>>>>> set
> > >>>>>>> by MMTTY is 2125/170
> > >>>>>>>
> > >>>>>>>
> > >>>>>>>
> > >>>>>>
> > >>>>>> _______________________________________________
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> > >>>>>> http://lists.contesting.com/mailman/listinfo/rtty
> > >>>>>
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> > >>>>>
> > >>>>
> > >>>>
> > >>>>
> > >>>>>
> > >>>>> No virus found in this incoming message.
> > >>>>> Checked by AVG - www.avg.com
> > >>>>> Version: 9.0.856 / Virus Database: 271.1.1/3159 - Release Date:
> > >>>>> 09/25/10
> > >>>>> 10:45:00
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