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From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <281222.921.qm@web26004.mail.ukl.yahoo.com> <001301c901e6$917c2d30$2201a8c0@PC2> <731EB49F88B309428FFDDD2423F810E441C128@HERMES4.ds.leeds.ac.uk> <48AADCE5.7070602@virgin.net> <034D836CD37D497C80547813F78DE240@AGB> <48AB191F.2070100@w1tag.com> <2BD00AC139914C138F0FB6FE5FB00F4D@AGB> <48AD575F.3010204@w1tag.com> <1ED6E58E4A6A4E8E801AF303F0C61DE9@AGB> <48ADD53E.80000@w1tag.com>
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Subject: Re: LF: Keyboard Modes for 600 Meters
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Interesting , John,

 I don't think I got round to  running those  two, they are coded in 
multipsk  , but from experience 'wide' systems didn't appear to  travel very 
well on 500 . The systems that I listed are simple  on/off change state , 
which could be modulated by simple carrier frequency switching ,

Everything this end was/is linear in the traditional sense , cheating a bit 
with the Racal  MA1723 and a 25 watt class -A- 24vdc driver amp for most of 
the year and later, a lucky find on e-bay a Skanti 250 watt o/p pa module 
from a hf/mf 8000 series marine  transmitter ..

G ..

--------------------------------------------------
From: "John Andrews" <w1tag@w1tag.com>
Sent: Thursday, August 21, 2008 9:51 PM
To: <rsgb_lf_group@blacksheep.org>
Subject: Re: LF: Keyboard Modes for 600 Meters

>
> Graham,
>
> Again, with the dangers of replying from work...<g>
>
> You should be able to run MFSK 8 or 16 through your grinder...those are 
> single-tone-at-a-time systems, and have very nice FEC for this sort of 
> work.
>
> John A.
>
> Graham wrote:
>> Ok John,
>>
>> I spent a while last year looking for modes that would go through these 
>> 'Meat grinder' transmission systems , only found , RTTY , Amtor arq/fec, 
>> Pactor arq/fec and Hf  Packet , 'hell' of course , but thats in a gray 
>> zone .... I think the original Jason system will but with the advent of 
>> 'Bill's joined up writing, windows 'xp' it looks to  of fallen over ..My 
>> version crashes on rx/tx change over . I think it made sequential 
>> frequency change steps, which where measured by rx software and thus 
>> determined the character .... which on 500 would be a good system, with 
>> no lock up time and presumably would print correctly to  the point of 
>> loosing the last set of tones  ?...
>>
>> Graham ..
>>
>> Ps  (Alberto, any chance of a recompiled 'xp' version ? )
>>
>>
>>
>> --------------------------------------------------
>> From: "John Andrews" <w1tag@w1tag.com>
>> Sent: Thursday, August 21, 2008 12:54 PM
>> To: <rsgb_lf_group@blacksheep.org>
>> Subject: Re: LF: Keyboard Modes for 600 Meters
>>
>>>
>>> Graham,
>>>
>>>> I think you will find , olivia  runs more than one tone at any one time 
>>>> and produces a 'two tone test' envelope , simple check, view the sound 
>>>> card o/p on a scope ?
>>>
>>> (Belated reply...) Yes, you are correct about Olivia -- easily confirmed 
>>> with a scope in a short on-air test. This once again teaches me not to 
>>> make quick observations while at work!
>>>
>>> John W1TAG
>>>
>>>
>>>
>>> No virus found in this incoming message.
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>>> 270.6.6/1623 - Release Date: 8/20/2008 08:12
>>>
>>>
>>>
>>
>>
>>
>>
>
>
>
> No virus found in this incoming message.
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>
>