[WriteLog] BARTG 75 setup

Thu Apr 25 23:49:19 EDT 2013

Recall the AA6YQ profile, modify it as you need then save the modified
profile to an open slot (Profile(S) | Assign Menu) ...

73,

    ... Joe, W4TV

On 4/25/2013 8:44 PM, Gary AL9A wrote:
> Ok Joe, you've hit the nail on the head again!  When I change profiles
> in my clone RttyRite window to something other than the AA6YQ profile it
> decodes just fine at 75 baud.  I guess I need to read the MMTTY docs
> though about how to make a copy of the AA6YQ profile and then tweak some
> of the settings as you suggest.  I see there is a section in the
> USERPARA.INI file called
>
> [Define4]
> Name=AA6YQ FIR512
>
> I suppose I could just copy this section somewhere else and save it then
> do the modifications via the MMTTY screens.  If they work, or not, I
> could just copy this section back into the USERPARA.INI file and restore
> it to original condition.  Or, just make a backup copy of the entire
> USERPARA.INI file with a different name and then restore that.  I'll
> give this a try later tonight. Thanks again.
>
> 73,
> Gary AL9A
>
>
> ----- Original Message ----- From: "Joe Subich, W4TV" <lists at subich.com>
> To: <writelog at contesting.com>
> Sent: April 24, 2013 10:35 PM
> Subject: Re: [WriteLog] BARTG 75 setup
>
>
>>
>>> In the second clone window running XMMT.ocx and MMTTY with the AA6YQ
>>> profile I have set the Mode to 75 baud in RttyRite and in its MMTTY
>>> instance. However, the decoding in this clone window is still not
>>> perfect.
>>
>> Don't even think abut using the AA6YQ profile for 75 baud.  The filters
>> are simply too narrow for the added bandwidth.  You are seeing the
>> effects of inter-symbol interference from channel (Mark/Space) filters
>> that are close to optimum for 45.45 baud but have far too much delay
>> for 75 baud.
>>
>> The AA6YQ profile has *two* cascaded 512 tap filters in each decoder
>> channel - the "Dual Peak filter" as a bandpass filter and a second
>> 512 tap FIR resonator for each channel.  Each of those resonators is
>> 35 Hz wide - far too narrow for 75 baud.
>>
>> I'd copy the AA6YQ profile ... *uncheck* the Dual Peak filter on the
>> Demodulator tab, change the TAP in the Discriminator box to 386 and
>> increase the FW setting in the Pre-Filter/BPF to 150 as a starting
>> point for 75 baud work.   In addition, I would enable ATC (AFC/ATC
>> tab) and set sweep to .3
>>
>> 73,
>>
>>    ... Joe, W4TV
>>
>>
>> On 4/25/2013 12:41 AM, Gary AL9A wrote:
>>> Thanks for the help Joe.  I followed the new WriteLog and MK II setup
>>> instructions at the support page and I can now send 75 baud using
>>> XMMT.ocx using MMTTY per the instructions.  I'm not sure what changed in
>>> the setup I was already using, but obviously something got reset.
>>>
>>> So now my situation is this.  I can send at 75 baud in the main RttyRite
>>> window and what I'm sending decodes correctly in the blue italic font.
>>> In the clone 2Tone window Setup is set to 75 baud and the RttyRite
>>> window has the Mode set to 75 baud.  When I send a macro at 75 baud
>>> 2Tone decodes it properly in that clone window.  In the second clone
>>> window running XMMT.ocx and MMTTY with the AA6YQ profile I have set the
>>> Mode to 75 baud in RttyRite and in its MMTTY instance.  However, the
>>> decoding in this clone window is still not perfect.  I can see some of
>>> my macro message decoding, but many of the characters are still
>>> garbled.  I'm not sure what will happen with this window under "live"
>>> receive at 75 baud when on the air signals are coming in.
>>>
>>> I will continue to try various things with the second RttyRite clone
>>> window and see if I can get it to decode better.  Perhaps a different
>>> profile other than the AA6YQ one?
>>>
>>> 73,
>>> Gary AL9A
>>>
>>>
>>>
>>>
>>> ----- Original Message ----- From: "Joe Subich, W4TV" <lists at subich.com>
>>> To: <writelog at contesting.com>; "Gary AL9A" <al9a at mtaonline.net>; "DONALD
>>> A HILL" <aa5au at bellsouth.net>
>>> Sent: April 24, 2013 6:41 PM
>>> Subject: Re: [WriteLog] BARTG 75 setup
>>>
>>>
>>>>
>>>>
>>>>
>>>> On 4/24/2013 9:53 PM, Gary AL9A wrote:
>>>>>
>>>>> So unless I am missing something here, when using the XMMT.ocx
>>>>> interface
>>>>> it will not be possible to achieve 75 baud unless you use Hardware
>>>>> generated FSK.  But Hardware generated FSK with XMMT.ocx will produce
>>>>> the buffer timing speed issue that is unacceptable.  So now my
>>>>> thinking
>>>>> is that in order to run 75 baud for the BARTG 75 I must go back and
>>>>> reinstall the MMTTY plug-in and use that for the RttyRite transmit
>>>>> window at 75 baud  instead of XMMT.ocx?  As I am typing this my
>>>>> mind is
>>>>> now asking should I delete all my RttyRite sections in the ini file an
>>>>> let WL rebuild those too?  Life ain't simple out here on the bleeding
>>>>> edge!
>>>>
>>>> Gary,
>>>>
>>>> Go to the MK II area at www.microHAM-USA.com/Support.html, download the
>>>> updated configuration for Writelog and MK II *and follow it* for the
>>>> SM6SRW MMTTY Plug-in for Writelog or the XMMT.ocx interface using FSK.
>>>>
>>>> I have just checked and *both* work perfectly at 75 baud.  I was able
>>>> to transmit at 75 baud and receive on a different system at 75 baud in
>>>> either 2Tone or MMTTY (using WinWarbler) as well as the decoder built
>>>> into the K3.
>>>>
>>>> You *must* use MMTTY to generate the FSK - *DO NOT* attempt to use the
>>>> WriteLog software (or hardware) generated FSK.  It appears that one can
>>>> not select 75 baud with *hardware* generated FSK and the SM6SRW MMTTY
>>>> Plug-in for WriteLog (although it is possible to use Hardware generated
>>>> FSK at 75 baud with XMMT.ocx).
>>>>
>>>> It will be necessary to set the baud rate in MMTTY (Options | Setup
>>>> MMTTY | Decode tab) ... I recommend defining a "Profile" for 75 baud
>>>> so you can return to it quickly.  Also make sure "Fixes 45.45" is *NOT*
>>>> checked in HAM Default or every time you chick "HAM" the data rate will
>>>> be reset to 45.45 baud.
>>>>
>>>> Software Generated FSK is 45.45 baud only and can not be used for this
>>>> contest.
>>>>
>>>>
>>>> 73,
>>>>
>>>>    ... Joe, W4TV
>>>>
>>>
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>>>
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>
>