Hopefully, if this gets posted my email problems are now resolved (Server
name had to be changed, and hadn't kept the bulk email giving instructions
sent 6 months ago)
SNAP - we've done much the same then, only I used the AD9852 DDS for a VHF
beacon with an identical structure For JT65 all you need to do is
pre-encode the symbols for your message using Joe's utility, then save the
64 symbols in EEPROM. Change the timing to the new symbol rate, any symbol
counters and the sync vector. Looks simple enough, although I haven't done
it yet.
Andy G4JNT
----- Original Message -----
From: "Johan Bodin" <[email protected]>
To: <[email protected]>
Sent: Thursday, April 14, 2005 5:08 PM
Subject: Re: LF: LF and JT65
Andy wrote:
> I have been looking into JT65, and its earlier incarnation JT44, in some
> depth recently for use on beacons. It is very amenable to being
generated
> in a simple driver based around a DDS chip.
I don't know JT65 but I experimented with a micropower JT44 beacon on HF
about two years ago. GPS time & 1PPS -> PIC -> AD9850 DDS. Maybe it can
be converted to JT65? I will send the PIC code to anyone interested.
73
Johan SM6LKM
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Internal Virus Database is out-of-date.
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Version: 7.0.308 / Virus Database: 266.9.5 - Release Date: 2005-04-07
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Internal Virus Database is out-of-date.
Checked by AVG Anti-Virus.
Version: 7.0.308 / Virus Database: 266.9.5 - Release Date: 2005-04-07
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Checked by AVG Anti-Virus.
Version: 7.0.308 / Virus Database: 266.9.5 - Release Date: 2005-04-07
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