but.. I think the original question also asked about modes other than PSK31,
what about them?JT65A, for example is not a mode that once has to watch
ALC so much. Does anyone have a good easy to understand description of why
?
Andy
On Wed, Feb 17, 2010 at 8:42 PM, DANNY DOUGLAS
As I think I understand it, JT65 and it's varients are all very slowly
modulated which makes the waveform extremely robust. ALC, noise, flutter,
Doppler shift and intersymbol interference all have a very tough time making
much of an impact on such an incredibly rugged signal as JT65.
But this
A rough and ready explanation could be that modes which rely on phase are
degraded when you compress the TX signal (ALC displayed) - for phase modes
you must transmit a 100% clean signal, much more important then signal
strength.
Simon Brown, HB9DRV
http://sdr-radio.com
From:
Following on from this thread and reading some of Peter's comments makes me
wonder what method is best for 300 baud HF packet with a TNC? FSK or AFSK? Or
won't it make any difference? Will FSK result in a wider bandwidth?
73
Sholto
K7TMG
sholtofish wrote:
Following on from this thread and reading some of Peter's comments makes me
wonder what method is best for 300 baud HF packet with a TNC? FSK or AFSK? Or
won't it make any difference? Will FSK result in a wider bandwidth?
The main advantage of FSK, so I am led to believe,
- Original Message -
From: Dave Ackrill dave.g0...@tiscali.co.uk
To: digitalradio@yahoogroups.com
Sent: Thursday, February 18, 2010 3:27 PM
Subject: Re: [digitalradio] Re: Introduction and question
sholtofish wrote:
Following on from this thread and reading some of Peter's comments makes
me
DOUGLAS
Sent: Wednesday, February 17, 2010 8:42 PM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] Re: Introduction and question
To bypass all the technical stuff: just listen to the PSK bands and watch
for single stations which show up across the waterfall in numerous places
@yahoogroups.com
Sent: Thursday, February 18, 2010 8:09 PM
Subject: RE: [digitalradio] Re: Introduction and question
I ran into this. I sent the operator a nice email. He explained that the
problem was on my end because his sig was overloading my receiver. He seemed to
know more than
Wes,
Welcome to the digital modes. 1967 was a good year - I was also first licensed
in '67.
This web site has some interesting information about digital modes.
http://f1ult.free.fr/DIGIMODES/MULTIPSK/digimodesF6CTE_en
An important parameter is the mean/peak power ratio for each of the modes.
I forgot to mention...
I feel a little guilty when running 50 watts on PSK31 now. In the past 6
months I have logged over 50 QSOs including Japan and Europe (both 5000
miles) with less than 1 watt. It takes a little more patience but it has been
a real eye-opener to discover what can be
: Thursday, February 18, 2010 8:31 PM
To: digitalradio@yahoogroups.com
Subject: Re: [digitalradio] Re: Introduction and question
Malarkey, unless you are next door to him. If ALL signals are doing so,
then maybe it is your receiver, but I much doubt it. You can listen to
14.069 for instance
Welcome to the group, Wes.
That is an interesting question, I look forward to seeing other answers.
My answer is rather vague and generalized . I'm going to argue that reduced
power is not really the issue, but that reduced power is often associated with
no ALC which most point out is a key
See Wes
I knew someone much more technicly minded would come up with a wealth of
information. Lol
Good job Andy
Toby mm0tob
---Original Message---
From: obrienaj
Date: 18/02/2010 00:47:16
To: digitalradio@yahoogroups.com
Subject: [digitalradio] Re: Introduction and question
: Re: [digitalradio] Re: Introduction and question
See Wes
I knew someone much more technicly minded would come up with a wealth
of information. Lol
Good job Andy
Toby mm0tob
---Original Message---
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