Hello Joe, all,
if there are some "takers" I could do some JT9-10 transmission tonight on
501.4kHz (500kHz dial) starting 20 UTC.
The setup here is a Kenwood TS440 transmitting on 3.5MHz mixed with 3MHz xtal
osc. down to 500kHz, filtered and amplified to 6W RF (estimated 20mW ERP).
With this setup I was copied up to 1600km (OH) in JT9-1 and JT9-2.
It would be interesting to know if the frequency stability such a basic setup
is OK for JT9-10.
73, Rik ON7YD - OR7T
________________________________________
Van: [email protected] [[email protected]]
namens Joe Taylor [[email protected]]
Verzonden: maandag 17 december 2012 23:47
To: [email protected]
Onderwerp: Re: LF: JT9-10 @ 474 +1400
Hi Laurence, Steinar, and all,
On 12/17/2012 5:15 PM, Laurence KL1 X wrote:
> Steinar I was getting some reasonable syncs but appeared not
> stable enough - so that confirms it :-) Laurence KL 1 X
LA5VNA wrote:
>> Thanks Tobias. The conclusion is clear , my system in NOT stable enough
>> when using JT9-10. Pity , but that's life ;(
Please send me an example of a JT9-10 file that seems like it should
have decoded, but did not. NOBODY has yet done so. I am reasonably
sure that small amounts of frequency drift can be detected and
adequately compensated in software... but I can't do it without some
typical examples.
If you know it, it will help to have, along with the file, the message
that was being transmitted.
Note to all: I am presently working on a version or WSPR that will allow
transmissions of length 10 (or 15?) and 30 minutes, with other features
like the traditional WSPR. Sensitivity should be as good as the WSPR-8
and WSPR-32 tests made by Marcus (and others).
-- 73, Joe, K!JT
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