Message-ID: <004901c81cd0$3a505e60$0d00000a@AGB>
From: "Graham" <g8fzk@g8fzk.fsnet.co.uk>
To: <rsgb_lf_group@blacksheep.org>
References: <001101c81a9a$0be1eae0$f11e7ad5@w4o8m9> <1148957206.20071030081706@gmx.de> <001f01c81aeb$c8d92590$0e00000a@AGB> <001601c81b09$2b5e11e0$eb047ad5@w4o8m9> <000701c81b36$b23598a0$c8197ad5@w4o8m9> <001d01c81b4b$dfd78600$4b1f7ad5@w4o8m9> <016a01c81ba4$8768d4c0$6f6a6a58@wgt01> <002f01c81be8$63ee8dc0$1e1a8351@w4o8m9>
Date: Thu, 1 Nov 2007 21:43:23 -0000
MIME-Version: 1.0
Subject: Re: LF: EER Transverter and Linear Modes testing
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Hi Jim,



Interesting on the system, How are you driving it ?



As for 'tests' well , what's the audio bandwidth of you system ? ,   looks 
like most modes are in multipsk , but for rtty at  85 hz shift , mmtty  has 
that option



Problem is the propagation , the window is not very long, but psk31 looks to 
do  a good job , and ive run a session using Olivia  16 tones @ 250 Hz bw , 
that looked to  get the best reception reports , only thing is its  250 hz 
wide , I noticed that multi psk has a 110 baud hf packet mode , its no wider 
than olivia , would be interesting to  see if  it would manage a qso , using 
very short frames , might just get in during the qsb peaks , ?



To date, Its proved very hard to  have a qso via data , mainly due to  qsb , 
any system that requires to  'lock' first gives poor results ..



Graham ..





----- Original Message ----- 
From: "James Moritz" <james.moritz@btopenworld.com>
To: <rsgb_lf_group@blacksheep.org>
Sent: Wednesday, October 31, 2007 6:03 PM
Subject: Re: LF: EER Transverter and Linear Modes testing


> Dear Gary, Graham, LF Group
>
> Thanks for the screen shots of the Chirped Hell sigs. The "speed" used
> during the tests was intended to be viewed with the same spectrogram
> settings as QRSS 3
>
> I will be out this evening, but will try some more tests tomorrow. I have
> PSK31 working on my shack PC at the moment, plus I have downloaded some 
> RTTY
> software which will hopefully be working by then. I'm open to suggestions 
> as
> to what sort of tests to do.
>
> BTW Graham - for your preset pots, Farnell part number 452 610 looks like
> the right thing.
>
> Cheers, Jim Moritz
> 73 de M0BMU
>
>
>
>
>
> -- 
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>
>