[RTTY] INRAD filter question

[Joe Subich, W4TV]

 > 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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>>>>
>>>>
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