[600MRG] HF-MF band planning

[Jim Miller]

JT65 and the rest of the JT modes are FSK and inherently don't need SSB.
They can of course be generated that way and poorly at times.

PSK31 requires a linear that you'd find in an SSB rig.

jim ab3cv


On Mon, Mar 3, 2014 at 10:20 PM, Carl <km1h at jeremy.mv.com> wrote:

> It is my understanding that JT-65 is transmitted in the USB mode of the
> typical SSB exciter and that is where the IMD is generated. If that is
> going into a Class C amp it can only get worse.
>
> There wasnt a turf battle on 160 until more JT-65 users arrived and
> wouldnt listen to reason on how to adjust their rigs, its not much
> different than trying to use a SS rig and linear amp on AM...... set up
> correctly and they sound fine.
>
> Even K1JT himself has stated that JT-65 should only be used on the higher
> HF bands and up as it was developed for EME and MS and to use JT9 elsewhere.
>
> Listen on 1838 when the band is active.
>
> Carl
> KM1H
>
>
> ----- Original Message ----- From: "Edward R Cole" <kl7uw at acsalaska.net>
> To: "Carl" <km1h at jeremy.mv.com>; "Michael Mussler" <mmussler at wispertel.net>;
> "Rudy Severns" <n6lf at epud.net>
> Cc: "600MRG" <600mrg at w7ekb.com>
> Sent: Monday, March 03, 2014 9:40 PM
> Subject: Re: [600MRG] HF-MF band planning
>
>
>  Carl,
>>
>> What are you talking about?  JT-65 is the same as CW, a single tone that
>> changes audio frequency in steps.  No IMD.  In fact one can run a class-C
>> amp with it, just like CW.  It does take up wider bandwidth but that is a
>> separate issue from IMD.  If they are overdriving the amplifiers into
>> clipping that would be bad.  You can do that with CW.
>>
>> I have no idea how JT65 is being utilized on 160m, so there may be some
>> turf battles going on.  On 630m JT-65 probably takes up too much spectrum
>> and a NB mode like JT-9 may be more appropriate.
>>
>> I would like to see a version or variant of psk-31 allowed for plain old
>> "rag chew" texting.  RTTY may take too much bw.  Packet is certainly out.
>>
>> CW should be included.  Is their enough room for WSPR?  Or should we
>> develop a variant of WSJT that can do both communicating and propagation
>> beaconing?  We need for Joe Taylor to be informed of this discussion.
>>
>> 73, Ed-KL7UW
>>
>> At 11:55 AM 3/3/2014, Carl wrote:
>>
>>> Id also suggest that JT-9 be used for all MF and lower HF bands as it is
>>> far superior and the occupied bandwidth is much narrower than JT-65 plus
>>> its attendent poor IMD from poorly adjusted equipment. It has already
>>> ruined part of the 160M DX window on 1838.
>>>
>>> Carl
>>> KM1H
>>>
>>>
>>> ----- Original Message ----- From: "Michael Mussler" <
>>> mmussler at wispertel.net>
>>> To: "Rudy Severns" <n6lf at epud.net>
>>> Cc: "600MRG" <600mrg at w7ekb.com>
>>> Sent: Monday, March 03, 2014 2:27 PM
>>> Subject: Re: [600MRG] HF-MF band planning
>>>
>>>
>>>  I made a similar response; including MF for their consideration.
>>>>
>>>> -Mike/12
>>>>
>>>>
>>>>
>>>> _______________________________________________
>>>> 600MRG mailing list
>>>> 600MRG at w7ekb.com
>>>> http://w7ekb.com/mailman/listinfo/600mrg_w7ekb.com
>>>>
>>>>
>>>> -----
>>>> No virus found in this message.
>>>> Checked by AVG - www.avg.com
>>>> Version: 2014.0.4335 / Virus Database: 3705/7146 - Release Date:
>>>> 03/03/14
>>>>
>>>
>>>
>>> _______________________________________________
>>> 600MRG mailing list
>>> 600MRG at w7ekb.com
>>> http://w7ekb.com/mailman/listinfo/600mrg_w7ekb.com
>>>
>>
>> 73, Ed - KL7UW
>> http://www.kl7uw.com
>>     "Kits made by KL7UW"
>> Dubus Mag business:
>>     dubususa at gmail.com
>>
>>
>> _______________________________________________
>> 600MRG mailing list
>> 600MRG at w7ekb.com
>> http://w7ekb.com/mailman/listinfo/600mrg_w7ekb.com
>>
>>
>> -----
>> No virus found in this message.
>> Checked by AVG - www.avg.com
>> Version: 2014.0.4335 / Virus Database: 3705/7148 - Release Date: 03/03/14
>>
>>
>
> _______________________________________________
> 600MRG mailing list
> 600MRG at w7ekb.com
> http://w7ekb.com/mailman/listinfo/600mrg_w7ekb.com
>
>