In real world operating, has anyone really experienced a difference or could
tell a difference?
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N1JM wrote:
In real world operating, has anyone really experienced a difference or could
tell a difference?
If AFSK is working right, I don't think it is possible to tell the
difference between it and FSK by listening [unless the two audio tones
aren't clean sine waves]. I think the real
On Jun 13, 2010, at 2:07 PM, N1JM wrote:
In real world operating, has anyone really experienced a difference or could
tell a difference?
When you are a weak station looking for holes in between loud stations to put
yourself in, yes, it will matter how wide those stations are.
(It is like
As in the past, I suppose this convrsation could go on, but my setup is very
simple- 2 cables: data out from the radio the line in on the PC and fsk out
from a PC comport(simple transistor keyer inside serial cable housing) to
radio fsk in. No audio levels to adjust, no vox to adjust. But as they
The only real difference I've heard is that on some strong signals you
can occasionally hear the unwanted sideband mirroring the intended AFSK
signal. This signal is at a level reduced by the unwanted sideband
suppression characteristics of the transmitter involved and separated by
twice the
Theoretically FSK should be cleaner than AFSK. With the latter you can
get the following spurious signals:
- Incompletely-suppressed carrier
- Unwanted sideband
- Audio harmonics of the AFSK tones
None of those unwanted signals occur with true FSK.
With either FSK or AFSK you can get switching
Good poiny.
On Jun 13, 2010, at 5:18 PM, Mike Cox [via Elecraft] wrote:
The only real difference I've heard is that on some strong signals you
can occasionally hear the unwanted sideband mirroring the intended AFSK
signal. This signal is at a level reduced by the unwanted sideband
Good point not poiny :-).
On Jun 13, 2010, at 5:18 PM, Mike Cox [via Elecraft] wrote:
The only real difference I've heard is that on some strong signals you
can occasionally hear the unwanted sideband mirroring the intended AFSK
signal. This signal is at a level reduced by the unwanted
Fair enough.
Mike NF4L
Brett Howard wrote:
I'm one of those guys that is a glutton for punishment... To me the
fact that FSK is more complicated and I've not done it before is the
actual advantage. I do see FSK as a method that is slightly less prone
to TX distortions. I built my
Brett Howard wrote:
I do see FSK as a method that is slightly less prone
to TX distortions.
You might be surprised. In my setup I can switch back and forth
instantly between FSK and AFSK. I have done some testing with a second
receiver, and my K3's RTTY signal seems to be cleaner in AFSK
: [Elecraft] MMTTY FSK
Fair enough.
Mike NF4L
Brett Howard wrote:
I'm one of those guys that is a glutton for punishment... To me the
fact that FSK is more complicated and I've not done it before is the
actual advantage. I do see FSK as a method that is slightly less prone
to TX distortions. I
...In my setup I can switch back and forth
instantly between FSK and AFSK. I have done some testing with a second
receiver, and my K3's RTTY signal seems to be cleaner in AFSK than FSK
(lower odd-order sidebands).
The K3 uses continuous-phase switching between the IF (and AF monitor)
Its not more difficult just more fun cause I got to pull out the screwdriver
and soldering iron. That and it was harder for me cause that method I'd not
used before. I like using fsk and made a few contacts with it last night so
I can now say Ive make both ways work successfully.
~Brett (N7MG)
On Jun 12, 2010, at 6/125:09 AM, Richard Ferch wrote:
Brett Howard wrote:
I do see FSK as a method that is slightly less prone
to TX distortions.
I have done some testing with a second
receiver, and my K3's RTTY signal seems to be cleaner in AFSK than FSK
(lower odd-order sidebands).
Chen,
Very interesting. Thanks for your link.
Have you looked at the waveform with the AFSK TX Filter turned on?
Rick
K6LE
On 6/12/2010, at 9:09 , Kok Chen wrote:
On Jun 12, 2010, at 6/125:09 AM, Richard Ferch wrote:
Brett Howard wrote:
I do see FSK as a method that is slightly less
-
From: elecraft-boun...@mailman.qth.net
[mailto:elecraft-boun...@mailman.qth.net] On Behalf Of Mike
Sent: Saturday, June 12, 2010 6:37 AM
To: Brett Howard
Cc: elecraft
Subject: Re: [Elecraft] MMTTY FSK
Fair enough.
Mike NF4L
Brett Howard wrote:
I'm one of those guys that is a glutton
Ok so I've never done RTTY via true FSK only audio modes... I have to
put in a fence this weekend so I won't be able to play this weekend but
I'm trying to get ready for FD...
So I've made an interface that consists of a couple opto couplers (one
for FSK and one for PTT)... I've got the radio
Hi Brett,
You might want to look at EXTFSK/COMFSK ... it's generally known to
work well with USB adapters...
http://mmhamsoft.amateur-radio.ca/pages/mmtty/ext-fsk.php
Also make sure no other application has the COM port open, and that
your FTDI adapter really is COM3!
~Iain / N6ML
On
When I got my K3, I was hot to get it set up on FSK. Somebody here
convinced me to try AFSK, and I was blown away by how simple it is, and
less complicated to set up. AFAICT, FSK offers no advantage.
73, Mike NF4L
Brett Howard wrote:
Ok so I've never done RTTY via true FSK only audio modes...
Brett
Go into device manager and change the COM number to something unused and
other than 3. As you know, many computers reserve or use COM3 in the
background for such things as modems.
73
Greg
AB7R
On 6/11/2010 3:54 PM, Brett Howard wrote:
Ok so I've never done RTTY via true FSK only
Iain actually pointed me in the direction of using the EXTFSK .dll
interface as the FTDI interfaces don't support any speeds less than 300
bps. EXTFSK uses the media timers to generate the baud rates at slower
speeds. Kinda stinks that you've gotta use windows timers as that was
the main reason
I'm one of those guys that is a glutton for punishment... To me the
fact that FSK is more complicated and I've not done it before is the
actual advantage. I do see FSK as a method that is slightly less prone
to TX distortions. I built my interface using opto couplers and then
put in a few
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