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CX2SA > SATDIG 17.04.17 16:50l 721 Lines 24420 Bytes #999 (0) @ WW
BID : AMSATBB12104
Read: GUEST
Subj: AMSAT-BB-digest V12 104
Path: IW8PGT<CX2SA
Sent: 170417/1439Z @:CX2SA.SAL.URY.SOAM #:5241 [Salto] FBB7.00e $:AMSATBB12104
From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Dupe contacts on SO-50 (Tucker McGuire)
2. Re: Dupe contacts on SO-50 (Ted)
3. Re: Dupe contacts on SO-50 (Mike Diehl)
4. Re: Dupe contacts on SO-50 (Ken Alexander)
5. Re: Dupe contacts on SO-50 (Mike Diehl)
6. Re: Dupe contacts on SO-50 (John KI4RO)
7. Traveling through EM grids (Matthew Stevens)
8. Re: Traveling through EM grids (Gabriel Zeifman)
9. Nayif Data Warehouse (David Johnson)
10. Re: Dupe contacts on SO-50 (skristof@xxxxxxx.xxxx
11. Re: Dupe contacts on SO-50 (skristof@xxxxxxx.xxxx
12. Re: Traveling through EM grids (R.T.Liddy)
13. SDR transmitter asa Doppler dig-gen (Robert Bruninga)
----------------------------------------------------------------------
Message: 1
Date: Sun, 16 Apr 2017 21:58:21 -0400
From: Tucker McGuire <tucker@xxxxxxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Dupe contacts on SO-50
Message-ID:
<CA+gmQJQLURqTU-2Jh1G1KcNd4ofSAWd5_qDCPA00W38pU1up0g@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Hello space bird enthusiasts,
I have noticed that certain stations on busy SO-50 passes work the same
stations that they have worked on many previous passes when they are in the
same grid. Dupe contacts.
This can prevent and has prevented other stations from trying to work new
grids that happen to be on or perhaps prevented them from working a new guy
that hasn't been on the satellites before. On quiet passes I see no issues
with working the same station you've worked hundreds of times before but on
busy SO-50 passes it is just disruptive.
Maybe I'm just a curmudgeon but that's my two cents.
Cheers & 73,
Tucker
W4FS
------------------------------
Message: 2
Date: Sun, 16 Apr 2017 19:00:42 -0700
From: "Ted" <k7trkradio@xxxxxxx.xxx>
To: "'Tucker McGuire'" <tucker@xxxxxxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Dupe contacts on SO-50
Message-ID: <000101d2b71e$6ba17150$42e453f0$@xxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Oh boy, here we go....
-----Original Message-----
From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of Tucker
McGuire
Sent: Sunday, April 16, 2017 6:58 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Dupe contacts on SO-50
Hello space bird enthusiasts,
I have noticed that certain stations on busy SO-50 passes work the same
stations that they have worked on many previous passes when they are in the
same grid. Dupe contacts.
This can prevent and has prevented other stations from trying to work new
grids that happen to be on or perhaps prevented them from working a new guy
that hasn't been on the satellites before. On quiet passes I see no issues
with working the same station you've worked hundreds of times before but on
busy SO-50 passes it is just disruptive.
Maybe I'm just a curmudgeon but that's my two cents.
Cheers & 73,
Tucker
W4FS
_______________________________________________
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: Sun, 16 Apr 2017 19:24:38 -0700
From: Mike Diehl <diehl.mike.a@xxxxx.xxx>
To: Tucker McGuire <tucker@xxxxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Dupe contacts on SO-50
Message-ID: <4D612929-566C-4D49-9D40-C05DE55F0912@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Tucker,
You bring up a situation that I'm all too familiar with. I'm not sure but it
seems to be closely coupled with FM repeater operation where stations give a
shout out to other stations they know. If only regular FM repeaters worked
10 minutes every hour and a half then maybe ops would realize how precious
of a resource FM passes are.
I also agree with the lonely pass situation. Out here on the left coast we
run into a lot of quiet time. Many times I'm surprised I don't have to turn
the bird on. On this type of pass it is perfectly acceptable to work the
same stations or put your call out to generate activity to help others find
the bird. Even some rag chewing with breaks is perfectly fine given you
don't loose situational awareness.
I think the situation you're describing is where a rare grid(s) is on or a
demo station is on and you get a station who feels the need to call out or
work dupes. There are many passes where I've just listened to the magic of
radio in action, it has its own rewards. Making contacts is great but you
really have to remind yourself that everyone else is trying for the same. It
really is OK to have a pass go by where all you do is SWL.
73,
Mike Diehl
AI6GS
> On Apr 16, 2017, at 6:58 PM, Tucker McGuire <tucker@xxxxxxxxxxx.xxx> wrote:
>
> Hello space bird enthusiasts,
>
> I have noticed that certain stations on busy SO-50 passes work the same
> stations that they have worked on many previous passes when they are in the
> same grid. Dupe contacts.
>
> This can prevent and has prevented other stations from trying to work new
> grids that happen to be on or perhaps prevented them from working a new guy
> that hasn't been on the satellites before. On quiet passes I see no issues
> with working the same station you've worked hundreds of times before but on
> busy SO-50 passes it is just disruptive.
>
> Maybe I'm just a curmudgeon but that's my two cents.
>
> Cheers & 73,
> Tucker
> W4FS
> _______________________________________________
> 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: Mon, 17 Apr 2017 03:09:58 +0000 (UTC)
From: Ken Alexander <k.alexander@xxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>, Tucker McGuire <tucker@xxxxxxxxxxx.xxx>
Subject: Re: [amsat-bb] Dupe contacts on SO-50
Message-ID: <145549261.1904622.1492398598007@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I see a new category of LID on the horizon: the operator who likes to say
hello to his friends.
When this is over, will there be any satellite operators left who AREN'T
LIDs for one reason or another?
--------------------------------------------
On Sun, 4/16/17, Tucker McGuire <tucker@xxxxxxxxxxx.xxx> wrote:
Subject: [amsat-bb] Dupe contacts on SO-50
To: amsat-bb@xxxxx.xxx
Received: Sunday, April 16, 2017, 9:58 PM
Hello space bird enthusiasts,
I have noticed that certain stations on
busy SO-50 passes work the same
stations that they have worked on many
previous passes when they are in the
same grid. Dupe contacts.
This can prevent and has prevented
other stations from trying to work new
grids that happen to be on or perhaps
prevented them from working a new guy
that hasn't been on the satellites
before. On quiet passes I see no issues
with working the same station you've
worked hundreds of times before but on
busy SO-50 passes it is just
disruptive.
Maybe I'm just a curmudgeon but that's
my two cents.
Cheers & 73,
Tucker
W4FS
_______________________________________________
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: 5
Date: Sun, 16 Apr 2017 20:27:14 -0700
From: Mike Diehl <diehl.mike.a@xxxxx.xxx>
To: Ken Alexander <k.alexander@xxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Dupe contacts on SO-50
Message-ID: <4FCBF512-F671-478A-832C-D64670253549@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Ken,
I think Tucker was going down the road of lack of situational awareness. It
is great to stop and say hi to friends but do you do this on a busy highway,
no. If we think of busy FM passes like the 405 here in LA you can see where
this is counterproductive.
If you want to hang out and chat with your friends then us hams have many
options. HF, DMR, IRLP, the list is long. We all know if there was a single
channel only on 40m with a 10 minute opening and you wanted to say "howdy
neighbor" with DX rolling in you might be called a LID.
Just like anything else, there's a time and place for saying hi to old
friends, doing it in the middle of heavy traffic just isn't the time or place.
73,
Mike Diehl
AI6GS
> On Apr 16, 2017, at 8:09 PM, Ken Alexander <k.alexander@xxxxxx.xxx> wrote:
>
> I see a new category of LID on the horizon: the operator who likes to say
hello to his friends.
>
> When this is over, will there be any satellite operators left who AREN'T
LIDs for one reason or another?
>
>
>
> --------------------------------------------
> On Sun, 4/16/17, Tucker McGuire <tucker@xxxxxxxxxxx.xxx> wrote:
>
> Subject: [amsat-bb] Dupe contacts on SO-50
> To: amsat-bb@xxxxx.xxx
> Received: Sunday, April 16, 2017, 9:58 PM
>
> Hello space bird enthusiasts,
>
> I have noticed that certain stations on
> busy SO-50 passes work the same
> stations that they have worked on many
> previous passes when they are in the
> same grid. Dupe contacts.
>
> This can prevent and has prevented
> other stations from trying to work new
> grids that happen to be on or perhaps
> prevented them from working a new guy
> that hasn't been on the satellites
> before. On quiet passes I see no issues
> with working the same station you've
> worked hundreds of times before but on
> busy SO-50 passes it is just
> disruptive.
>
> Maybe I'm just a curmudgeon but that's
> my two cents.
>
> Cheers & 73,
> Tucker
> W4FS
> _______________________________________________
> 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
------------------------------
Message: 6
Date: Sun, 16 Apr 2017 23:48:54 -0400
From: John KI4RO <johnki4ro@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Dupe contacts on SO-50
Message-ID:
<CA+-NL41uchoeCGKvDGfc5Hp0Br_ihQ9n5Rv5x7nFZJkLXeEj2w@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Absolutely, Tucker.
The lack of situational awareness is one of the worst problems on SO 50, if
not the worst.
73
John KI4RO
------------------------------
Message: 7
Date: Sun, 16 Apr 2017 23:49:52 -0400
From: Matthew Stevens <matthew@xxxxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Traveling through EM grids
Message-ID: <A98D6C65-8B63-47A1-A74A-DAD67B5CFBEE@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
I will be leaving next Sunday afternoon (Apr. 23) for a trip to EM22 in
Texas. Driving, I will likely be traveling through EL89,
EM80/70/60/50/51/52/42/32/22. I'll have linear and FM capabilities along the
way.
This is a family trip with a deadline for our arrival in TX...so not a lot
of time for stops. However, if you need any of these grids send me an email
off list. I've gotten a few requests for EM52/42, and EM60. No promises on
anything, but if I know what people need I'll try and accommodate as much as
possible!
73
- Matthew kk4fem
Sent from my iPhone
------------------------------
Message: 8
Date: Sun, 16 Apr 2017 23:13:12 -0500
From: Gabriel Zeifman <gabrielzeifman@xxxxx.xxx>
To: Matthew Stevens <matthew@xxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Traveling through EM grids
Message-ID: <EE61DE83-C805-49CF-BE35-41791A9CB37C@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Matt,
EL58 shouldn't be too far from your route. Hope to catch you there. Maybe we
can find a good EO-79 pass.
EL29 and EM12 would also be very welcome, particularly on FM.
73,
Gabe
NJ7H/VE6NJH/C6AGZ/V31NJ
> On Apr 16, 2017, at 10:49 PM, Matthew Stevens <matthew@xxxxxxxxx.xxx> wrote:
>
> I will be leaving next Sunday afternoon (Apr. 23) for a trip to EM22 in
Texas. Driving, I will likely be traveling through EL89,
EM80/70/60/50/51/52/42/32/22. I'll have linear and FM capabilities along the
way.
>
> This is a family trip with a deadline for our arrival in TX...so not a lot
of time for stops. However, if you need any of these grids send me an email
off list. I've gotten a few requests for EM52/42, and EM60. No promises on
anything, but if I know what people need I'll try and accommodate as much as
possible!
>
> 73
>
> - Matthew kk4fem
>
> Sent from my iPhone
> _______________________________________________
> 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: Mon, 17 Apr 2017 05:37:27 +0100
From: David Johnson <dave@xxxxx.xx.xx>
To: amsat-bb <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Nayif Data Warehouse
Message-ID: <B4CC400A-A2FE-4573-A969-FCC71F142958@xxxxx.xx.xx>
Content-Type: text/plain; charset=us-ascii
Hi
We are experiencing difficulties with the server after the restart
yesterday, please bear with us while we investigate,
73
Dave, G4DPZ
Sent from my iPad
------------------------------
Message: 10
Date: Mon, 17 Apr 2017 07:45:53 -0400
From: skristof@xxxxxxx.xxx
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Dupe contacts on SO-50
Message-ID: <cb8e8799501a37117b115807bb71837d@xxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII
Excellent point and a nice analogy, Mike.
Steve AI9IN
On 2017-04-16 23:27, Mike Diehl wrote:
> Ken,
>
> I think Tucker was going down the road of lack of situational awareness.
It is great to stop and say hi to friends but do you do this on a busy
highway, no. If we think of busy FM passes like the 405 here in LA you can
see where this is counterproductive.
>
> If you want to hang out and chat with your friends then us hams have many
options. HF, DMR, IRLP, the list is long. We all know if there was a single
channel only on 40m with a 10 minute opening and you wanted to say "howdy
neighbor" with DX rolling in you might be called a LID.
>
> Just like anything else, there's a time and place for saying hi to old
friends, doing it in the middle of heavy traffic just isn't the time or place.
>
> 73,
>
> Mike Diehl
> AI6GS
>
>> On Apr 16, 2017, at 8:09 PM, Ken Alexander <k.alexander@xxxxxx.xxx> wrote:
>>
>> I see a new category of LID on the horizon: the operator who likes to say
hello to his friends.
>>
>> When this is over, will there be any satellite operators left who AREN'T
LIDs for one reason or another?
>>
>> --------------------------------------------
>> On Sun, 4/16/17, Tucker McGuire <tucker@xxxxxxxxxxx.xxx> wrote:
>>
>> Subject: [amsat-bb] Dupe contacts on SO-50
>> To: amsat-bb@xxxxx.xxx
>> Received: Sunday, April 16, 2017, 9:58 PM
>>
>> Hello space bird enthusiasts,
>>
>> I have noticed that certain stations on
>> busy SO-50 passes work the same
>> stations that they have worked on many
>> previous passes when they are in the
>> same grid. Dupe contacts.
>>
>> This can prevent and has prevented
>> other stations from trying to work new
>> grids that happen to be on or perhaps
>> prevented them from working a new guy
>> that hasn't been on the satellites
>> before. On quiet passes I see no issues
>> with working the same station you've
>> worked hundreds of times before but on
>> busy SO-50 passes it is just
>> disruptive.
>>
>> Maybe I'm just a curmudgeon but that's
>> my two cents.
>>
>> Cheers & 73,
>> Tucker
>> W4FS
>> _______________________________________________
>> 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
> _______________________________________________
> 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: Mon, 17 Apr 2017 07:42:42 -0400
From: skristof@xxxxxxx.xxx
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Dupe contacts on SO-50
Message-ID: <f1fe191cc92ebe15f4b70938d054fda0@xxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII
Tucker has expressed a real concern about a real problem.
And now we know who the actual curmudgeon is.
Steve AI9IN
On 2017-04-16 22:00, Ted wrote:
> Oh boy, here we go....
>
> -----Original Message-----
> From: AMSAT-BB [mailto:amsat-bb-bounces@xxxxx.xxxx On Behalf Of Tucker
> McGuire
> Sent: Sunday, April 16, 2017 6:58 PM
> To: amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] Dupe contacts on SO-50
>
> Hello space bird enthusiasts,
>
> I have noticed that certain stations on busy SO-50 passes work the same
> stations that they have worked on many previous passes when they are in the
> same grid. Dupe contacts.
>
> This can prevent and has prevented other stations from trying to work new
> grids that happen to be on or perhaps prevented them from working a new guy
> that hasn't been on the satellites before. On quiet passes I see no issues
> with working the same station you've worked hundreds of times before but on
> busy SO-50 passes it is just disruptive.
>
> Maybe I'm just a curmudgeon but that's my two cents.
>
> Cheers & 73,
> Tucker
> W4FS
> _______________________________________________
> 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
------------------------------
Message: 12
Date: Mon, 17 Apr 2017 14:11:07 +0000 (UTC)
From: "R.T.Liddy" <k8bl@xxxxxxxxx.xxx>
To: Matthew Stevens <matthew@xxxxxxxxx.xxx>, "amsat-bb@xxxxx.xxxx
<amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Traveling through EM grids
Message-ID: <906128042.1775312.1492438267300@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Matthew,
I need many of those Grids, so I'll be looking for you. Many of themhave
been on my yearly route from my Daughter in TX to my Brotherin FL. I've
found that the far back end of the many Truck Stops alongthe highways is a
good spot to set up and be out of the way since it'sa long walk for drivers
to get to the building. However, it's NOT a goodarea to be in at night. Safe
travels!!
73, ? Bob ?K8BL
From: Matthew Stevens <matthew@xxxxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Sent: Sunday, April 16, 2017 11:50 PM
Subject: [amsat-bb] Traveling through EM grids
I will be leaving next Sunday afternoon (Apr. 23) for a trip to EM22 in
Texas. Driving, I will likely be traveling through EL89,
EM80/70/60/50/51/52/42/32/22. I'll have linear and FM capabilities along the
way.
This is a family trip with a deadline for our arrival in TX...so not a lot
of time for stops. However, if you need any of these grids send me an email
off list. I've gotten a few requests for EM52/42, and EM60. No promises on
anything, but if I know what people need I'll try and accommodate as much as
possible!
73
- Matthew kk4fem
Sent from my iPhone
_______________________________________________
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: Mon, 17 Apr 2017 10:37:51 -0400
From: Robert Bruninga <bruninga@xxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] SDR transmitter asa Doppler dig-gen
Message-ID: <f67f3cb1859a9bbe433471af97ccc3aa@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Some students built an HF inverting SSB transponder simulator. (4 diodes,
and a siggen at 58 MHz) so they can then use two FT-817?s on the 21.4 MHz
uplink and 29.4 MHz downlink) for our next satellite:
http://aprs.org/hfsat.html )
Now we want to use an USRP 2922 SDR as the programmabel oscillator around
58 MHz so we can simulate Doppler.
Can anyone whip out some code to make the oscillator follow a Doppler Ramp
in freuqncy from say 58.100 to 58.900 MHz over a ten minute pass. That
should be easy enough for one-observer. Can just be linear for now
(simulating a low pass).
But then once that is done, we need the driver to then FLIP the Doppler
shift instantly in the opposite direction to simulate the shift seen by
another observer at the other end of the pass. This is another layer of
complexity, but we will simply have a push button input to shift between
the two states when one station or the other is transmitting.
But for now, the students just need some handholding to get the basic SDR
acting as a signal gen at 58 MHz and how to input the freqncy ramp to it.
Thanks
Bob, WB4APR
------------------------------
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 12, Issue 104
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