Re: [WriteLog] low tones

[Jerry Pixton <jpixton@shentel.net>]

Ron, et al

Yes, it is a neat toy. And IMHO that is just what it is. I used the rtty 
mode for about a year and used the special twin peak filter when things 
really got tough. BUT I could not stand to listen at the increased audio 
processing noise that came along with the filter. It drove me crazy. If I 
really needed the twin peak I had to turn my headset audio OFF. Maybe that 
is a problem with my radio, I haven't asked others about the audio 
processing noise when using the twin peak filter. (By way of comparing, I 
just got the MFJ audio processor which also has a twin peak filter that is 
quiet). And the regular rtty filters, even set at 100 hz are terrible 
compared to the "Brickwall" filters that Icom runs in LSB-D. I gave it my 
trail under fire on 20m this week end (had one radio doing mostly s&p on 
20m). Only a very few times would I hear a REALLY strong station off 
frequency that was audible but that still did not interfere with copying 
the message. Not at all like the rtty mode performance where everyone 
several kHz away pumps the AGC.

I am just learning to live with the downsides, I will continue to use LSB-D 
until someone can tell me how to trick the rig to use the data filters in 
RTTY mode. Best of all worlds, some firmware that moves that nice data 
filter up to 2210 hz so that FSK can be used.

Jerry, W6IHG





At 12:11 PM 2/16/2004 -0500, Ron St.Laurent ND5S wrote:
> Hi Jerry,
>
> Have you tried the TPF Twin Peak Filter on your ProII?  It is a great tool.
> It "enhances" the mark and space tones on a given frequency and I have
> copied stations I would have otherwise lost.
>
> Put your rig in RTTY mode.  On the buttons just to the left of the display
> push and hold RTTY FIL, this will bring up a sub menu.  Turn Twin Peak
> Filter ON.  When you look at your MTTY "histogram" display in receive you
> will see how the frequencies at mark and space are enhanced.  With your RTTY
> FILTER ON and exiting the menu you will see TPF on the top line of your
> display showing that it is activated.  Neat toy!
>
> Ron ND5S
>
> Visit my Website at:
> www.qsl.net/nd5s
>
> ----- Original Message -----
> From: "Jerry Pixton" <jpixton@shentel.net>
> To: <writelog@contesting.com>
> Sent: Monday, February 16, 2004 11:21 AM
> Subject: [WriteLog] low tones
>
>
> > All you low toners
> >
> > You can tell I have nothing better to do today, HI
> >
> > I am using mmtty plug in to rtty windows. I have changed one rig to use
> > AFSK with 1415\1585 hz tones because the IC756proII has  a wonderful data
> > filter centered at 1500 hz in LSB-D mode. IMHO much better then its RTTY
> > filters. (The down side is clicking on the bandmap or a packet spot puts
> > the rig in LSB not LSB-D and so you have to manually switch back)
> >
> > So I have mmtty using 1415 and 1585 hz tones - had to change one value in
> > mmtty.ini to get exactly 1415 hz.
> >
> > Now my question -
> >
> > Are there other mmtty values that I should be worrying about to adjust the
> > different algorithms for these new tones?
> >
> > Jerry, W6IHG
> > ------------------------------------------
> > Dr. Jerry R. Pixton, PIXOS Designs LLC
> > http://www.pixos.com/designs/RadioTuner/
> > jpixton@shentel.net
> > ------------------------------------------
> >
> >
> > _______________________________________________
> > WriteLog mailing list
> > WriteLog@contesting.com
> > http://lists.contesting.com/mailman/listinfo/writelog
> > WriteLog on the web:  http://www.writelog.com/
> >

------------------------------------------
Dr. Jerry R. Pixton, PIXOS Designs LLC
http://www.pixos.com/designs/RadioTuner/
jpixton@shentel.net
------------------------------------------


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