Hi Jim,
Thanks for the info! Got both manuals, and must have missed that... :)
I have noticed that the K3 centers things... I used to have to move
things around with Macros on the PRO III... :) THis radio is
interesting, the harder you look at it, the more complex it is... :)
It really is a
I'm note sure the title makes any sense.
Now I hate to admit this but I've had more
contacts in the last two month than in the last
ten years using JT65HF.
I'm using a FT-1000D with BPF on 20 and 10 meters
with a Cushcraft Vertical. I think I bought it when
Cushcraft was still in NH.
I'm
The only real concern for using the K3 with WSJT-X (JT65 and
JT9 simultaneously) is to make sure you get either the FM or
AM (13 KHz or 6 KHz) roofing filter so you can widen the RX
bandwidth to the full 4.2 KHz. With a 2.7 or 2.8 KHz filter
you will be limited to one mode or the other and
I have both those filters, 2.7 and 2.8 and am able to crank the width to
4KHz. Also using WSJT-X and am able to adjust/widen the screen to 4KHz
for both modes, works great!
73 Dwight NS9I
On 4/21/2014 9:52 AM, Joe Subich, W4TV wrote:
The only real concern for using the K3 with WSJT-X (JT65
With a 2.4 KHz filter (not on a K3) I only got partial band coverage on
JT65/JT9).
Is there any advantage to using a CW filter to look at a eq channels at
a time ?
Or is it better just to use the DSP to narrow it down ?
Larry
DGB [via Elecraft] wrote:
I have both those filters, 2.7 and 2.8
There are, of course, exceptions to that rule. When there is a
very strong signal in the passband that is causing the receiver
to reduce gain to the point that a weak signal is not copyable,
a CW filter (400 Hz) centered on the weak signal can often make
the difference between copy and no copy.
On 4/21/2014 8:28 AM, Larry Lopez wrote:
Or is it better just to use the DSP to narrow it down ?
K1JT says that it is best to run the radio broadband and let the WSJT
software provide the needed selectivity in its decoding algorithm. The
reason is simple -- phase shift can cause decoding
On 4/21/2014 10:05 AM, Joe Subich, W4TV wrote:
There are, of course, exceptions to that rule. When there is a
very strong signal in the passband that is causing the receiver
to reduce gain to the point that a weak signal is not copyable,
a CW filter (400 Hz) centered on the weak signal can
Thanks Joe and Jim:
So you need a linear phase filter.
Is the DSP filter linear phase ?
I'm searching for linear phase filter and ending up finding references
in this group !!!
Larry, N2CS
--
View this message in context:
Phase noise is an issue, however, adjacent signals in the filter passband
seem to have more of an impact on the ability to decode weak signals than
the phase noise associated with narrower filters. I have been able to
decode weak DX stations with 400Hz and even 250Hz filters that I could not
Are you in DATA mode when you use JT65. What mode for PSK?
--
Thanks and 73's,
For equipment, and software setups and reviews see:
www.nk7z.net
for MixW support see;
http://groups.yahoo.com/neo/groups/mixw/info
for Dopplergram information see:
http://groups.yahoo.com/neo/groups/dopplergram/info
Phase noise is *not* the problem/solution being discussed.
It is the phase *shift* through the filter. That is signals (within the
passband) of one frequency are not delayed by exactly the same amount of
time as signals of another frequency. That is a different 'animal' than
phase noise.
On 4/21/2014 12:49 PM, David Cole wrote:
Are you in DATA mode when you use JT65. What mode for PSK?
RTFM. :) If you're using a computer to generate the signal, use DATA A
for everything but RTTY. For RTTY from the computer use AFSK.
DATA A means that the computer generates the data
JT65:
http://elecraft.365791.n2.nabble.com/JT65HF-Data-Mode-A-td7513437.html
my FT1000D was USB.
--
View this message in context:
http://elecraft.365791.n2.nabble.com/How-to-outfit-a-K3-for-JT65HF-or-JT9-tp7587584p7587636.html
Sent from the Elecraft mailing list archive at Nabble.com.
But what about EME.
You want a narrow filter and you want constant group delay.
I'll research that as a separate topic.
Let's close this out.
In a pinch the 5 pole filter which comes with the rig is ok.
6K AM, 12K FM are recommended making up selectivity
in the DSP.
Narrow filters recommended
Larry Lopez wrote
So you need a linear phase filter.
Is the DSP filter linear phase ?
I teach DSP and filters at the University of Oslo. Of the two DSP filter
types, FIR (Finite Impulse Response) and IIR (Infinite Impulse Response),
only an FIR filter can be designed to have exact linear phase
Oh my, I finally get it.
You don't even need the K3's DSP.
Thank you.
--
View this message in context:
http://elecraft.365791.n2.nabble.com/How-to-outfit-a-K3-for-JT65HF-or-JT9-tp7587584p7587644.html
Sent from the Elecraft mailing list archive at Nabble.com.
Larry,
EME is about weak signal reception, and all the signals on the band
segment are weak.
So there are no strong adjacent signals to worry about.
The situation on HF is different. If there is a station within the
passband at S-9+30, it is on the borderline for activating the Hardware
don't forget the K3's tunable Notch, I have found it works quite well to
attenuate those offending S9 +30 signals. The width is just shy of a
JT65 signal, but if you make sure to cover the low end it works. You can
watch it working in the waterfall. I always run with the K3's AGC off...ymmv
sm
The hardware AGC cannot be turned off - it is a protection system for
the ADC that proceeds the DSP and must be protected from overload
otherwise garbage will be the result. Yes, the tunable notch will
attenuate signals that are within the passband of the roofing filter,
but only the roofing
On 4/21/2014 8:51 PM, Sam Morgan wrote:
don't forget the K3's tunable Notch, I have found it works quite well
to attenuate those offending S9 +30 signals.
The Manual notch is outside the AGC loop - it can not protect the AGC
system from pumping and as such only serves to protect the sound
21 matches
Mail list logo
