Yes, well done Frank,
Andy K3UK
--- In digitalradio@yahoogroups.com, Sholto Fisher [EMAIL PROTECTED] wrote:
Frank,
I read your article this morning on the ARRL site. Good job!
I especially liked the Bonus Tip - try 30m :)
73, Sholto
KE7HPV.
Tooner wrote:
Hello all,
You've
http://www.arrl.org/news/features/2008/03/11/10007?nc=1
10 Tips for the PSK31 Digital Mode
By Frank Ravenswood, K2NCC
[EMAIL PROTECTED]
March 11, 2008
There's more to going over the waterfall than just having a good barrel.
An example of a Waterfall display. [photo by Frank Ravenswood,
Enable your RF attenuation and increase the volume. This can help keep a
strong signal from wiping out the weaker ones.
Attenuation will probably be around 20 dB, but by dropping the noise level,
the signal readability may improve.
AGC (Automatic Gain Control) does nothing for a weak signal;
--- In digitalradio@yahoogroups.com, Rein Couperus [EMAIL PROTECTED] wrote:
First thing to do of course is make sure THERE ARE NO STRONGER ONES.
This can be done various ways. Typically, I use the variable
bandwidth tuning and IF shift to avoid strong signals. But, that's
rare to need to do
There is no difference between an RF gain control and AGC. AGC is just
Auotmatic Gain control instead of manual gain control.
The only way to copy a weak signal adjacent to a strong one is to prevent
the strong signal from affecting the AGC, and the only way to do that is by
using a narrrow
One more consideration is AGC recovery time.
Slow AGC and static crashes are not a good combo in many of the digital
modes.
No AGC or Fast AGC will make a difference in that situation.
This may not apply to PSK-31 as much as more complex digital modes, but a
point worth considering.
DSP
Skip
- Original Message -
From: David Little [EMAIL PROTECTED]
To: digitalradio@yahoogroups.com
Sent: Wednesday, March 12, 2008 4:25 PM
Subject: RE: [digitalradio] Re: 10 Tips for the PSK31 Digital Mode
One more consideration is AGC recovery time.
Slow AGC and static crashes are
kh6ty wrote:
A dual-loop AGC system may help and some high-end transceivers have this.
73, Skip KH6TY
Dual loop AGC is a two sided sword. I have come to find better, and not
necessarily easier, to have low noise, low gain stages before the
filters that will not overload so easily.
The
My comments were meant to be a bit provocative I am reacting to this
subject now for the umpteenth time, and still people get the advice to use 2.5
kHz bandfilters
on a 31 Hz wide signal. That way you will not get optimum performance from your
RX.
The ONLY point I wanted to make is that
--- In digitalradio@yahoogroups.com, Rein Couperus [EMAIL PROTECTED] wrote:
... I have visited several hams who could hear MORE than twice
the stations after switching from a 2.5 kHz (panoramic) to 250 Hz
filter.
While on the subject of filters, my current setup allows me to narrow
my SSB
Rein Couperus wrote:
My comments were meant to be a bit provocative
He! Well, you knew what you were doing
The ONLY point I wanted to make is that if you use a proper filter,
matched to the mode, you will have a lot more fun and hear/work many
more stations. The tradeoff is that
Hi all,
I am in communication with Ev, W2EV with regards to the current PropNet
JT65 contention issue and he has asked what my proposal would be
regarding frequency coordination.
PropNet and JT65 both require international potential so this means they
both need to be in the small region of
I recommend that they move even higher in the 140-150 segment, PSK runs
around 141 to 143, RTTY 142 to 145 so I guess if they want to be nice
they could even move higher, what caused them to move down the band?
Ron W4LDE
Sholto Fisher wrote:
Hi all,
I am in communication with Ev, W2EV with
Ron,
I asked Ev the same question and his reply was:
Hi Sholto,
During DXpeditions, it seems that split frequency
operators were telling people to listen in the same
segment that PropNET was operating within.
Trying to be good band co-occupants, we studied DX
spots and determined
Frank,
500 Hz is already a nice improvement with respect to 2.5 kHz..
While on the subject of filters, my current setup allows me to narrow
my SSB signal down to 500 Hz. Maxed out, the pass band is about 2.7
kHz, (3.6 on CW Wide.)
I have no optional filters installed, so I've been thinking
Warning:
DXpeditions have a lifetime of average 1 week, they send there 'clients'
where they find a quiet spot. The next one will find you.
73,
Rein EA/PA0R/P
Hi Sholto,
During DXpeditions, it seems that split frequency
operators were telling people to listen in the same
segment
With some of the recent comments about filtering and the use of the
Elecraft K2, I was wondering if these rigs are OK for the wider digital
modes that can exceed 2000 Hz.
Also, do you find that most rigs with no TCXO (such as the K2), will
work OK for the digital modes, including MFSK16 and
Also, do you find that most rigs with no TCXO (such as the K2), will
work OK for the digital modes, including MFSK16 and similar modes that
require very close tolerance on frequency stability?
Both rigs that I have been using for digital modes, both wide and narrow do
not have
TCXO installed,
I asked Ev some of the same questions with the same type of answers. Propnet
on 20m is tucked away on 14097, so being a narrow mode a good place for them
would be just under 10150. Since they are not involved in QSO's and are
simply transmitting beacons that would be a good place for them.
By request, I have added a MEPT SKED page at
http://www.obriensweb.com/sked
click on MEPT and join the experimenting... with 6hz wide signals !
Andy k3UK
-- In digitalradio@yahoogroups.com, Andrew O'Brien [EMAIL PROTECTED]
wrote:
From:Joe Taylor, K1JT
Subject: New software for
That would probably QRM the HF APRS channel, which is around 10.1495 (10.1515
LSB, 2100-2300 Hz AF).
Unfortunately, it's almost impossible to do any kind of frequency coordination
on 30m. It's been my experience that there isn't one single Hz of bandwidth
that is not occupied by CW, gigawatt
How about moving the JT65 stations, the freq was simply one suggested
by Bonnie, nothing cast in stone.
On Wed, Mar 12, 2008 at 9:34 PM, Joe Veldhuis [EMAIL PROTECTED] wrote:
That would probably QRM the HF APRS channel, which is around 10.1495
(10.1515 LSB, 2100-2300 Hz AF).
Andy,
I am ok with this idea too but we have to start somewhere.
Ev is being extremely cooperative in looking for a solution/compromise
and I have posted a message to the WSJT group asking for their help too.
But I am seeing most JT65 and JT2 etc still using the 10.139 frequency
so thought
OK Sholto,. Ev is always very cooperative.
Andy.
--- In digitalradio@yahoogroups.com, Sholto Fisher [EMAIL PROTECTED] wrote:
Andy,
I am ok with this idea too but we have to start somewhere.
Ev is being extremely cooperative in looking for a solution/compromise
and I have posted a
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