[TenTec] Omni VI Mod 3 and RTTY

[Bob McGraw - K4TAX]

In my opinion {there's a dangerous word} FSK is for the die hard purist.

AFSK is much easier, specially with today's radios, computers, software and 
interface boxes.

73
Bob, K4TAX

----- Original Message ----- 
From: "Tim Randa" <tranda at cox.net>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: Monday, January 26, 2009 9:20 PM
Subject: Re: [TenTec] Omni VI Mod 3 and RTTY


A quick question on the subject. Why bother with the FSK when AFSK gets
the job done with much less hassle. Is there an advantage to FSK that I
as a extremely casual RTTY user haven't a clue about?

de Tim KØFL

Bob McGraw - K4TAX wrote:
> I too used my Omni VI Plus on FSK.  The 250 Hz filter worked will with the
> PBT properly adjusted.  The manual covers the alignment of the PBT 
> circuit.
>
> One extremely important point in using FSK is that the BFO oscillators 
> need
> to be very precisely aligned.  Follow the steps in the manual in their 
> exact
> order.  You probably will find it necessary to do this 2 or 3 times as 
> there
> is some interaction with the adjustments.  Also, a frequency counter that
> can read something in the order of 9 MHz to a resolution of 0.1 Hz is of
> great help and almost a necessity.  For better results, be sure the radio 
> is
> operating at room temperature for at least 1/2 hr with the covers in place
> before making these adjustments.
>
> After doing all of this, I too found AFSK was much easier to use.  Took 
> the
> audio IN and OUT from the connectors on the back panel and I let the VOX
> handle the RX/TX switching.
>
> 73
> Bob, K4TAX
>
>
> ----- Original Message ----- 
> From: "Ed" <w3nr at comcast.net>
> To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
> Sent: Monday, January 26, 2009 3:15 PM
> Subject: Re: [TenTec] Omni VI Mod 3 and RTTY
>
>
>
>> Jerry Pyle wrote:
>>
>>> I am in the process of setting up my station to run RTTY, preferably 
>>> FSK.
>>>
>>> My Omni VI Mod3 has all of the filter slots filled and upon inspection I
>>> found that there is not a 217 filter amongst the bunch.
>>>
>>> I have been on the searchable archives looking for a possible Inrad
>>> filter
>>> that will work in place of the 217 (which we all know TenTec no longer
>>> makes) or another workable solution using my existing 500hz filters.
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>> Jerry - WB7S
>>>
>>> Basin, WY
>>>
>>>
>>>
>>> http://wb7s.home.bresnan.net
>>>
>>>
>>>
>>> 73
>>>
>> I use my Omni6 on RTTY without a problem. Had a 217 and sold it, too
>> narrow. Use LSB and your 500hz filter(s) and you won't have a problem.
>>
>> FSK is fine as long as the 2 xtals are 170Hz apart, any more/less you
>> will not be happy. I use AFSK and as long as it is set right you won't
>> have any problems.
>>
>> If you do use FSK, the PBT needs to be set at 3 o'clock.
>>
>> All that is needed for the FSK keying cicuit is a 1K resistor in series
>> with the TXD line.
>>
>> Ed W3NR
>> _______________________________________________
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>> TenTec at contesting.com
>> http://lists.contesting.com/mailman/listinfo/tentec
>>
>>
>
>
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