| |
CX2SA > SATDIG 16.07.15 16:48l 798 Lines 31069 Bytes #999 (0) @ WW
BID : AMSATBB10206
Read: GUEST
Subj: AMSAT-BB-digest V10 206
Path: IW8PGT<IZ3LSV<IW0QNL<JH4XSY<JE7YGF<7M3TJZ<CX2SA
Sent: 150716/1443Z @:CX2SA.SAL.URY.SOAM #:24332 [Salto] FBB7.00e $:AMSATBB10206
From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Re: Can't digipeat APRS thru satellites (Joe Fitzgerald)
2. Re: PSAT PSK31 experimental software (Robert Bruninga)
3. Re: Can't digipeat APRS thru satellites (Ray Hoad)
4. Re: PSAT PSK31 experimental software (KO6TZ Bob)
5. Re: PSAT PSK31 experimental software (David W0DHB)
6. SO-50 (Lee Ernstrom)
7. Re: PSAT PSK31 experimental software (KO6TZ Bob)
8. Re: SO-50 (Mvivona)
9. Re: SO-50 (Paul Stoetzer)
10. Re: PSAT PSK31 experimental software (aflowers@xxxxxxxxxxx.xxxx
11. Re: PSAT PSK31 experimental software (Op ideas) (Robert Bruninga)
12. Re: SO-50 (Bill Dillon)
13. Re: PSAT PSK31 experimental software (Op ideas)
(aflowers@xxxxxxxxxxx.xxxx
14. Re: PSAT PSK31 experimental software (David W0DHB)
----------------------------------------------------------------------
Message: 1
Date: Wed, 15 Jul 2015 20:43:59 -0400
From: Joe Fitzgerald <jfitzgerald@xxxx.xxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Can't digipeat APRS thru satellites
Message-ID: <55A6FE4F.6040508@xxxx.xxx.xxx>
Content-Type: text/plain; charset=utf-8
On 7/15/2015 7:37 PM, Ted wrote:
> What is the proper object number for NO-84, please
>
>
40654
-Joe KM1P
------------------------------
Message: 2
Date: Wed, 15 Jul 2015 22:50:04 -0400
From: Robert Bruninga <bruninga@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] PSAT PSK31 experimental software
Message-ID: <303bf365050bd7ed38163f56bdf71591@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Great! This PSK31 TX-only software for PSAT PSK-31 solves three problems!
1) as a separate TX-only program, it lets everyone run FULL DUPLEX with
their existing PSK31 for receive
2) It makes your signal constant in the waterfall for You
3) and for everyone else even if they are not running anything special!
Maybe Andrew can comment on whether two separate sound cards are needed or
if it is possible to use a single sound card?
Bob, WB4aPR
-----Original Message-----
From: aflowers@xxxxxxxxxxx.xxx
Sent: Wednesday, July 15, 2015 6:41 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] PSAT PSK31 experimental software
I put together an experimental program called DopplerPSK to compensate for
the Doppler shift on the NO-84 (or NO-83) PSK31 uplink. In essence, its a
PSK31 transmitter that is merged with an orbital propagator to cause your
transmitted signal to drift exactly opposite to uplink Doppler effect. It
does this in a phase-continuous correction so that you don't get errors due
to discontinuous frequency adjustments from controlling a radio in discrete
steps.
In the case of PSAT and BricSat, it should cause your signal to stay at
constant frequency in the satellite's uplink receiver, and thus you should
get a stable frequency on the FM downlink as well. In turn, this means you
should be able to use your favorite PSK31 demodulating software to copy the
downlink since the frequency drift should stay well within the AFC tolerance
of the software.
Anyway, if there are any adventurous people who are set up to give this a
go, I would be interested in seeing if it actually works.
You can find a rough quick-start guide (which contains an explanation of how
it works and what you need to get started) and the application package on
the rather minimalist page here:
http://www.frontiernet.net/~aflowers/dopplerpsk/dopplerpsk.html
It's an experiment, so be prepared for disappointment. I am :-) Andy K0SM/2
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available to all
interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 3
Date: Wed, 15 Jul 2015 21:52:11 -0500
From: "Ray Hoad" <ray.hoad@xxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Can't digipeat APRS thru satellites
Message-ID: <005201d0bf72$6a426ee0$3ec74ca0$@xxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
We have chosen to use the NORAD ID 40654 as the object number for PSAT.
NORAD ID 40654 is labeled as PSAT in the SpaceTrack website where we get all
the rest of the our Keplerian elements for other satellites in TLE format.
We have chosen to follow SpaceTrack's lead to avoid confusion in the future.
Note ... because PSAT was launched on a military rocket flight, we cannot
get the TLEs directly from SpaceTrack. We can get them from the satellite
owner/operator. This is how we acquire the TLEs for PSAT and BRICSat each
week. But the owner/operator, in many cases, does not try to sort out who
is who on a launch with multiple cubesats. The TLEs we get from the
owner/operator are not labeled as BRICsat and PSAT, so we rely on our own
amateur community (Nico Janssen, PA0DLO and others) to sort the list of TLEs
out for us and to verify who is who.
Ray Hoad
WA5QGD
-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of Joe
Fitzgerald
Sent: Wednesday, July 15, 2015 7:44 PM
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Can't digipeat APRS thru satellites
On 7/15/2015 7:37 PM, Ted wrote:
> What is the proper object number for NO-84, please
>
>
40654
-Joe KM1P
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions
expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 4
Date: Wed, 15 Jul 2015 20:01:54 -0700
From: KO6TZ Bob <my.callsign@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] PSAT PSK31 experimental software
Message-ID: <55A71EA2.8020705@xxxxxxx.xxx>
Content-Type: text/plain; CHARSET=US-ASCII; format=flowed
Software is installed and ready for the 04:04utc pass tonight. (21:05 PDT)
It appears to work testing to a loop back to the soundcard. I can watch
the PSK31 signal change frequency on the receive . Remember two
programs can share the sound card.
I have and hour to figure how to set up more macros.
BOB KO6TZ
------------------------------
Message: 5
Date: Wed, 15 Jul 2015 21:10:43 -0600
From: "David W0DHB" <dave@xxxxx.xxx>
To: "'aflowers@xxxxxxxxxxx.xxxxx <andyk0sm@xxxxx.xxx>,
<amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] PSAT PSK31 experimental software
Message-ID: <003901d0bf75$00d93c60$028bb520$@xxxxx.xxx>
Content-Type: text/plain; charset="UTF-8"
Tried it out and worked ok, I need to create macros also as well as shutoff
my uplink Doppler tuning which was running during my test.
Bob, let's try and QSO tomorrow 1929 .
I like not having to have 2 full psk programs running.
Dave W0DHB
-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of
aflowers@xxxxxxxxxxx.xxx
Sent: Wednesday, July 15, 2015 4:41 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] PSAT PSK31 experimental software
I put together an experimental program called DopplerPSK to compensate for
the Doppler shift on the NO-84 (or NO-83) PSK31 uplink. In essence, its a
PSK31 transmitter that is merged with an orbital propagator to cause your
transmitted signal to drift exactly opposite to uplink Doppler effect. It
does this in a phase-continuous correction so that you don't get errors due
to discontinuous frequency adjustments from controlling a radio in discrete
steps.
In the case of PSAT and BricSat, it should cause your signal to stay at
constant frequency in the satellite's uplink receiver, and thus you should
get a stable frequency on the FM downlink as well. In turn, this means you
should be able to use your favorite PSK31 demodulating software to copy the
downlink since the frequency drift should stay well within the AFC tolerance
of the software.
Anyway, if there are any adventurous people who are set up to give this a
go, I would be interested in seeing if it actually works.
You can find a rough quick-start guide (which contains an explanation of how
it works and what you need to get started) and the application package on
the rather minimalist page here:
http://www.frontiernet.net/~aflowers/dopplerpsk/dopplerpsk.html
It's an experiment, so be prepared for disappointment. I am :-)
Andy K0SM/2
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions
expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 6
Date: Wed, 15 Jul 2015 21:45:29 -0600
From: Lee Ernstrom <lee.ernstrom@xxxxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] SO-50
Message-ID: <E2E95E5E-501C-4935-A30A-1F283341361A@xxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
On the 0330-0341 pass of SO-50 this evening, Wednesday, I couldn't get it to
come to life. Was it just me? Did I lose my pre-amp or was there something
wrong with the sat?
Lee (Doc) Ernstrom
Syracuse, Utah DN-31
Sent from my iPad
------------------------------
Message: 7
Date: Wed, 15 Jul 2015 21:31:04 -0700
From: KO6TZ Bob <my.callsign@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] PSAT PSK31 experimental software
Message-ID: <55A73388.4030809@xxxxxxx.xxx>
Content-Type: text/plain; CHARSET=US-ASCII; format=flowed
The software worked great !!! Produced a straight line on the waterfall
for the down link.
As expected, I was alone on the pass, so no opportunity for a contact.
I was using digi-pan for the RX, my signal was at around 2200Hz..
Probably an indication the oscillator in my radio is off a bit. I think
I will lower the frequency from 2000 to about 1600. That will put my
signal lower in the VF pass band.
I like the program. Had good copy.
THANKS.....
BOB KO6TZ
------------------------------
Message: 8
Date: Thu, 16 Jul 2015 01:04:23 -0400
From: Mvivona <Mvivona@xxxxx.xxx>
To: Lee Ernstrom <lee.ernstrom@xxxxxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] SO-50
Message-ID: <C37E4A7B-9181-49BD-8D5A-41336A8247F3@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Same here. I was concerned as I just purchased a nice used IC9100 and was
trying it out for the first time and heard nothing. Glad it wasn't jut me.
Michael Vivona
Sent from my iPad
On Jul 15, 2015, at 11:45 PM, Lee Ernstrom <lee.ernstrom@xxxxxxxx.xxx> wrote:
On the 0330-0341 pass of SO-50 this evening, Wednesday, I couldn't get it to
come to life. Was it just me? Did I lose my pre-amp or was there something
wrong with the sat?
Lee (Doc) Ernstrom
Syracuse, Utah DN-31
Sent from my iPad
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions
expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 9
Date: Thu, 16 Jul 2015 07:05:53 -0400
From: Paul Stoetzer <n8hm@xxxx.xxx>
To: Mvivona <Mvivona@xxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] SO-50
Message-ID:
<CABzOSOqa4DszZtVZvYPkmPWs9VP-HqY9sLPfX+g94eh0oM8BZA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Looks like it was heard on the West Coast around 0500. Sometimes uplink
interference from non-amateur traffic or amateurs ignorant of the satellite
subband can be quite strong, making it difficult to impossible to turn on.
73,
Paul, N8HM
On Thursday, July 16, 2015, Mvivona via AMSAT-BB <amsat-bb@xxxxx.xxx> wrote:
> Same here. I was concerned as I just purchased a nice used IC9100 and was
> trying it out for the first time and heard nothing. Glad it wasn't jut me.
>
> Michael Vivona
> Sent from my iPad
>
> On Jul 15, 2015, at 11:45 PM, Lee Ernstrom <lee.ernstrom@xxxxxxxx.xxx
> <javascript:;>> wrote:
>
> On the 0330-0341 pass of SO-50 this evening, Wednesday, I couldn't get it
> to come to life. Was it just me? Did I lose my pre-amp or was there
> something wrong with the sat?
>
> Lee (Doc) Ernstrom
> Syracuse, Utah DN-31
>
> Sent from my iPad
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx <javascript:;>. AMSAT-NA makes this open
> forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx <javascript:;>. AMSAT-NA makes this open
> forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 10
Date: Thu, 16 Jul 2015 12:28:45 +0000 (UTC)
From: "aflowers@xxxxxxxxxxx.xxxx <aflowers@xxxxxxxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] PSAT PSK31 experimental software
Message-ID:
<1083398169.178024.1437049725265.JavaMail.yahoo@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Bob, Dave;
That's great.? I'm interested in how well it tracks when the satellite is at
a very high elevation and the Doppler is >3 Hz/s.? I suspect the error is
going to be mostly in the estimates of the orbital elements, but we'll see.?
I will try to join you on the pass when I can cobble together an uplink and
a downlink in the same place--probably next week sometime after I get back
from vacation.
I think you should be able to share a sound device on most OS's, but I have
not tried.? I assumed it would work on modern Windows OS's because of the
hardware abstraction.??The program appears to run fine on OSX, but I have
not tried running CocoaModem or some other software next to it.??Ultimately
I could also add a demodulator to the program itself, but that will take
some work....I know several hams have separate sound cards for radio stuff,
so I may need to add a device selection option in case the system default
(or whatever Java picks as the default) isn't what you want.
The audio frequency displayed in DopplerPSK is the audio frequency being
send to the radio, not what you should expect in the passband of your
downlink receiver.?The LO on?PSAT?is apparently a bit below 28120 KHz, so if
your radio was tuned to 28120 USB (suppressed carrier frequency) you would
expect to be a bit higher than 2000Hz in the FM passband:
http://www.urel.feec.vutbr.cz/esl/files/Projects/PSAT/P%20sat%20transponder%20
WEB%20spec02.htm
In general,?if you want to be lower in the passband I would lower your
transmitter RF frequency rather than the audio frequency going to the
transmitter.? The reason being that if you have any non-linearity in the
audio chain you don't end up?transmitting a?harmonic higher in the band that
might bother someone else.? Of course, you can probably see if this is an
issue or not since the satellite also serves as a crude signal analyzer :-)?
I chose 2000 Hz as a center since at maximum Doppler of around 700 Hz, the
~2700 Hz tone?should go through the transmitter's IF filter without too much
attenuation while?keeping all the third harmonics and most of the time the
second harmonic?above the cutoff of a 3 KHz IF filter.? Every radio is a bit
different, however.? You may find that the 1500Hz sweep in the program shows
you all your passband ripple?in your IF filter :-)
Since it works, I'm more motivated to improve the ergonomics of the
interface.? Much of that depends on the unique operating practices of
satellite operation.
Andy K0SM/2
On Thursday, July 16, 2015 12:31 AM, KO6TZ Bob <my.callsign@xxxxxxx.xxx>
wrote:
The software worked great !!!? Produced a straight line on the waterfall
for the down link.
As expected, I was alone on the pass, so no opportunity for a contact.
I was using digi-pan for the RX, my signal was at around 2200Hz..
Probably an indication the oscillator in my radio is off a bit.? I think
I will lower the frequency from 2000 to about 1600.? That will put my
signal lower in the VF pass band.
I like the program.? Had good copy.
THANKS.....
BOB? KO6TZ
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
to all interested persons worldwide without requiring membership. Opinions
expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 11
Date: Thu, 16 Jul 2015 09:29:32 -0400
From: Robert Bruninga <bruninga@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] PSAT PSK31 experimental software (Op ideas)
Message-ID: <87766fbc47aa1f97340fec544f020fd2@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Full DUX PSK31 Operating ideas:
Can I assume the TX uplink software has the usual BRAG text and CQ
features, since the expectation is that users will continuously transmit
throughtout the entire pass and the operator has plenty to do other than
type continuously at the keyboard. So I envision some continuously
running brag text including CQ's the call, the HF antenna, the power, the
grid, the location in DDN/DDDW whole degrees maybe (for APRS purposes),
the downlink antenna, and so forth. And then maybe the looping uplink
will stop at the next item separator and allow the operator to inject
keyboard text.
In other words, the loop just runs. But if the operator begins typing
(maybe he sees a buddy in the dowonlink) he just starts typing and the
LOOP stops at the next break in loop elements and inserts the typed text.
Im thinking that elements in the brag string would be separated by " - "
but then when ever the operator types text, then it is inserted in the
stream beginning with [ then text goes here and ends with a ] when he hits
the enter key?
By having a common system of continuous brag items and interjected live
text, then we all have consistent expectations as to what the PC is doing
versus the operator?
Bob, WB4aPR
-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of KO6TZ Bob
Sent: Thursday, July 16, 2015 12:31 AM
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] PSAT PSK31 experimental software
The software worked great !!! Produced a straight line on the waterfall
for the down link.
As expected, I was alone on the pass, so no opportunity for a contact.
I was using digi-pan for the RX, my signal was at around 2200Hz..
Probably an indication the oscillator in my radio is off a bit. I think I
will lower the frequency from 2000 to about 1600. That will put my signal
lower in the VF pass band.
I like the program. Had good copy.
THANKS.....
BOB KO6TZ
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available to
all interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 12
Date: Thu, 16 Jul 2015 08:40:17 -0500
From: Bill Dillon <bill.g.dillon@xxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] SO-50
Message-ID:
<CADnLNZzeqFxCPXD2Bgk6XiHf+AjkBW_Vft7jzBAf7bd+ZLf7LA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I had no trouble on the following 05:15-05:30 UT pass.
73,
--Bill, KG5FQX
On Wed, Jul 15, 2015 at 10:45 PM, Lee Ernstrom <lee.ernstrom@xxxxxxxx.xxx>
wrote:
> On the 0330-0341 pass of SO-50 this evening, Wednesday, I couldn't get it
> to come to life. Was it just me? Did I lose my pre-amp or was there
> something wrong with the sat?
>
> Lee (Doc) Ernstrom
> Syracuse, Utah DN-31
>
> Sent from my iPad
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available
> to all interested persons worldwide without requiring membership. Opinions
> expressed
> are solely those of the author, and do not reflect the official views of
> AMSAT-NA.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 13
Date: Thu, 16 Jul 2015 14:22:06 +0000 (UTC)
From: "aflowers@xxxxxxxxxxx.xxxx <aflowers@xxxxxxxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] PSAT PSK31 experimental software (Op ideas)
Message-ID:
<652897796.203572.1437056526625.JavaMail.yahoo@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Bob,
What you are suggesting?sounds like?simply changing the idle signal?to
something with information in it.?? I don't see any reason why that couldn't
be done.? I'll give it some thought.? It's an experiment, after all....
Another way to do this is to just invent a mode that has two data streams
interleaved with each other, source-coded for the data you want to send (a
la JTx modes) but that breaks the universality of BPSK31 and varicode.? I
really like the idea that someone can plug a handheld into a laptop or
tablet running off-the-shelf software and see something meaningful.?
DopplerPSK?already has a rudimentary "macro" format.? Have a look at the PDF
on the download page and you'll get the gist of how it works.? It does not
have any substitution functionality yet (like wildcards for the other
stations' callsigns), but you could make a file with an arbitrary-length
fixed message just fine.? I have planned a loop functionality (it's in the
macro file format itself), but I didn't get around to implementing it
yet....right now you can just press the button several times to stack the
looped message in the buffer.? Just make sure there are spaces at the?end of
the text so that work don't run together between the boundaries.? One press
of the macro button just dumps that text into the type-ahead buffer.
The "clear buffer" button will empty the buffer and you can start typing
whatever you want.? You can use that to interrupt a macro message that is
sending.? The ergonomics of having a conversation are not perfect (you can't
copy paste into the text window and get it to send for example--which slow
typists might want), but it's functional enough to be somewhat useful.
Also of note for those not aware, sending uppercase requires many more bits
in the varicode table?and?is going to be more prone to bit errors due to
burst noise (like, say a quick fade from a?rotating satellite).? You can
probably send your callsign a couple times in lowercase in the same amount
of time it takes in all caps.? That's pretty poor FEC, and convolutional
codes can address some of that, but for right now DopplerPSK is stuck with
plain vanilla BPSK31 until someone implements a different scheme.? I'm not
really sure this a big problem to be solved, though.
Andy K0SM/2
On Thursday, July 16, 2015 9:29 AM, Robert Bruninga <bruninga@xxxx.xxx>
wrote:
Full DUX PSK31 Operating ideas:
Can I assume the TX uplink software has the usual BRAG text and CQ
features, since the expectation is that users will continuously transmit
throughtout the entire pass and the operator has plenty to do other than
type continuously at the keyboard.? So I envision some continuously
running brag text including CQ's the call, the HF antenna, the power, the
grid, the location in DDN/DDDW whole degrees maybe (for APRS purposes),
the downlink antenna, and so forth.? And then maybe the looping uplink
will stop at the next item separator and allow the operator to inject
keyboard text.
In other words, the loop just runs.? But if the operator begins typing
(maybe he sees a buddy in the dowonlink) he just starts typing and the
LOOP stops at the next break in loop elements and inserts the typed text.
Im thinking that elements in the brag string would be separated by " - "
but then when ever the operator types text, then it is inserted in the
stream beginning with [ then text goes here and ends with a ] when he hits
the enter key?
By having a common system of continuous brag items and interjected live
text, then we all have consistent expectations as to what the PC is doing
versus the operator?
Bob, WB4aPR
------------------------------
Message: 14
Date: Thu, 16 Jul 2015 08:41:15 -0600
From: "David W0DHB" <dave@xxxxx.xxx>
To: "'aflowers@xxxxxxxxxxx.xxxxx <andyk0sm@xxxxx.xxx>,
<amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] PSAT PSK31 experimental software
Message-ID: <006c01d0bfd5$7816be00$68443a00$@xxxxx.xxx>
Content-Type: text/plain; charset="UTF-8"
Hey Andy
The ability to select soundcard would be helpful. In my setup TX audio is
fed by a virtual audio cable set to match the 48K sample rate that
DopplerPSK is using.
Folks using windows should set the recording device side of their soundcard
to a 48K sample rate (it usually defaults to 44.1K).
You are correct that the uplink frequency is high, I apply a -300 Hz
calibration offset.
Thanks for all your work on this.
Dave W0DHB
-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of
aflowers@xxxxxxxxxxx.xxx
Sent: Thursday, July 16, 2015 6:29 AM
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] PSAT PSK31 experimental software
Bob, Dave;
That's great. I'm interested in how well it tracks when the satellite is at
a very high elevation and the Doppler is >3 Hz/s. I suspect the error is
going to be mostly in the estimates of the orbital elements, but we'll see.
I will try to join you on the pass when I can cobble together an uplink and
a downlink in the same place--probably next week sometime after I get back
from vacation.
I think you should be able to share a sound device on most OS's, but I have
not tried. I assumed it would work on modern Windows OS's because of the
hardware abstraction. The program appears to run fine on OSX, but I have
not tried running CocoaModem or some other software next to it. Ultimately
I could also add a demodulator to the program itself, but that will take
some work....I know several hams have separate sound cards for radio stuff,
so I may need to add a device selection option in case the system default
(or whatever Java picks as the default) isn't what you want.
The audio frequency displayed in DopplerPSK is the audio frequency being
send to the radio, not what you should expect in the passband of your
downlink receiver. The LO on PSAT is apparently a bit below 28120 KHz, so if
your radio was tuned to 28120 USB (suppressed carrier frequency) you would
expect to be a bit higher than 2000Hz in the FM passband:
http://www.urel.feec.vutbr.cz/esl/files/Projects/PSAT/P%20sat%20transponder%20
WEB%20spec02.htm
In general, if you want to be lower in the passband I would lower your
transmitter RF frequency rather than the audio frequency going to the
transmitter. The reason being that if you have any non-linearity in the
audio chain you don't end up transmitting a harmonic higher in the band that
might bother someone else. Of course, you can probably see if this is an
issue or not since the satellite also serves as a crude signal analyzer :-)
I chose 2000 Hz as a center since at maximum Doppler of around 700 Hz, the
~2700 Hz tone should go through the transmitter's IF filter without too much
attenuation while keeping all the third harmonics and most of the time the
second harmonic above the cutoff of a 3 KHz IF filter. Every radio is a bit
different, however. You may find that the 1500Hz sweep in the program shows
you all your passband ripple in your IF filter :-)
Since it works, I'm more motivated to improve the ergonomics of the
interface. Much of that depends on the unique operating practices of
satellite operation.
Andy K0SM/2
On Thursday, July 16, 2015 12:31 AM, KO6TZ Bob <my.callsign@xxxxxxx.xxx>
wrote:
The software worked great !!! Produced a straight line on the waterfall for
the down link.
As expected, I was alone on the pass, so no opportunity for a contact.
I was using digi-pan for the RX, my signal was at around 2200Hz..
Probably an indication the oscillator in my radio is off a bit. I think I
will lower the frequency from 2000 to about 1600. That will put my signal
lower in the VF pass band.
I like the program. Had good copy.
THANKS.....
BOB KO6TZ
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available to all
interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. AMSAT-NA makes this open forum available to all
interested persons worldwide without requiring membership. Opinions
expressed are solely those of the author, and do not reflect the official
views of AMSAT-NA.
Not an AMSAT-NA member? Join now to support the amateur satellite program!
Subscription settings: http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Subject: Digest Footer
_______________________________________________
Sent via amsat-bb@xxxxx.xxx.
AMSAT-NA makes this open forum available to all interested persons worldwide
without requiring membership. Opinions expressed
are solely those of the author, and do not reflect the official views of
AMSAT-NA.
Not an AMSAT member? Join now to support the amateur satellite program!
http://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
End of AMSAT-BB Digest, Vol 10, Issue 206
*****************************************
Read previous mail | Read next mail
| |
