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CX2SA > SATDIG 09.06.11 21:06l 356 Lines 12895 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: SSB Operation on the Satellites (David Palmer KB5WIA)
2. Re: SSB Operation on the Satellites
(Patrick STODDARD (WD9EWK/VA7EWK))
3. Re: VO52 and verticals (George Henry)
4. Re: [aprssig] FW: NASA Ames Phonesat Balloon Launch (Bob Bruninga)
5. Re: SSB Operation on the Satellites (Tom Schaefer, NY4I)
6. Re: VO52 and verticals (George Henry)
----------------------------------------------------------------------
Message: 1
Date: Thu, 9 Jun 2011 10:19:27 -0700
From: David Palmer KB5WIA <kb5wia@xxxxx.xxx>
Subject: [amsat-bb] Re: SSB Operation on the Satellites
To: n0jy@xxxxxxx.xxx
Cc: amsat-bb@xxxxx.xxx
Message-ID: <BANLkTikmUaKUMnxYVcTrjhH4=K5bP_i+=A@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Jerry's correct. If you only adjust your transmit frequency, such
that your receive frequency appears to stay the same -- then you're
automatically correcting for your own downlink doppler, but not for
anyone elses. Other hams in the footprint will still have to chase
you. The only way to stick with the "one true rule" is to adjust
*both* uplink and downlink during the pass.
That being said, adjusting the higher (UHF) transmit frequency on
VO-52 and AO-07 only (ie. manual control) will get you pretty close,
and you won't drift a whole lot. I hear plenty of hams doing this, as
long as there are just one or a two QSO's going on, they don't drift
into each other very often.
73 de Dave KB5WIA / CM88
SatPC32 with 2xFT817ND
On Thu, Jun 9, 2011 at 7:35 AM, <n0jy@xxxxxxx.xxx> wrote:
> OK my brain may be playing tricks, but if you vary only your transmit
> frequency such that you always hear yourself on the same downlink
> frequency, isn't it true that the other station may not necessarily be
> hearing you on the same downlink frequency and is chasing you anyway?
> Your doppler is +5kHz (for example) on the receive, the bird is just about
> to pass overhead of me though so my receive ferquency goes rapidly from
> +2kHz to -5kHz, your transmit tuning has no relation at all to what
> frequency I am listening on. ?Then the bird goes past you and you suddenly
> switch down 5kHz, so I have to follow you on my receive.
>
> Or am I nuts? ?(Quite possible, come see where I work and you will
> understand!)
>
> Jerry
> N?JY
>
>> I always varied the transmit.
>>
>> This way the person I'm talking to as well as any other listeners are
>> all on the same freq listening.
>>
------------------------------
Message: 2
Date: Thu, 9 Jun 2011 11:01:26 -0700
From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb@xxxxxx.xxx>
Subject: [amsat-bb] Re: SSB Operation on the Satellites
To: amsat-bb@xxxxx.xxx
Message-ID: <BANLkTinh2UU-bDrzsauRqAEZcxBpXKZqhA@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
Hi!
> That being said, adjusting the higher (UHF) transmit frequency on
> VO-52 and AO-07 only (ie. manual control) will get you pretty close,
> and you won't drift a whole lot. ?I hear plenty of hams doing this, as
> long as there are just one or a two QSO's going on, they don't drift
> into each other very often.
Actually, if stations would spread out a bit more on the transponders,
this would be even less of an issue. There is so much space that goes
to waste on these transponders, when everyone seems to never go
more than a few kHz up or down from the center. Sometimes, everyone
appears to be jammed up around the center separated by 1 or 1.5 kHz
between signals. When we have transponders with 50 to 100 kHz to
play with depending on the satellite, that seems crazy. At least there's
room where someone can go far away from the center to do testing
and not bother those around the center.
I'm one of those who does not use computer control, operating portable
stations in the field. I try to follow the portion of the One True Rule about
making adjustments on the higher of the two frequencies when not using
full computer control. Sometimes I have to make adjustments on both
frequencies to keep up with those who are fully computer controlled. I
use an FT-817ND as my transmitter, and either a second FT-817ND or
a Kenwood TH-F6A HT for my receiver (that HT has an all-mode wide-
band receiver in it). Whenever I get a home station again, or find a
laptop/netbook with an LCD panel that I can see well in the field, I will
take another look at putting my 817s under the control of SatPC32.
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
------------------------------
Message: 3
Date: Thu, 9 Jun 2011 11:07:10 -0700 (PDT)
From: George Henry <ka3hsw@xxx.xxx>
Subject: [amsat-bb] Re: VO52 and verticals
To: John Geiger <aa5jg@xxxxxxx.xxx>, AMSAT <amsat-bb@xxxxx.xxx>
Message-ID: <629698.95196.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
As I currently live in an antenna-restricted subdivision, I have been
experimenting with low-profile antennas for a couple of years now. My
experience has been that verticals are "iffy" for a couple of reasons: not
enough gain at low elevations when the path is longest, a deep null above 40
degrees or so, and fades due to polarization mis-matches. That being said, I
seem to do alright on VO-52 right now with a 1/4 wave UHF groundplane on the
uplink and a well-hidden 2-meter Eggbeater on the downlink, at elevations
between about 20 and 40 degrees.
I am in the process of building a turnstile for 437, which I hope will improve
both my uplink on VO-52 as well as my downlink on all the other birds.
George, KA3HSW
----- Original Message ----
> From: John Geiger <aa5jg@xxxxxxx.xxx>
> To: AMSAT-BB <amsat-bb@xxxxx.xxx>
> Sent: Thu, June 9, 2011 11:35:50 AM
> Subject: [amsat-bb] VO52 and verticals
>
> Has anyone had success getting into VO52 using a vertical, omnidirectional
> antenna on the uplink. I have a nice M2 2M9SSB for 2m but only have a
> dualband J pole to cover UHF with and wonder if I could get into VO52 with
> it for my uplink antenna.
>
> 73s John AA5JG
------------------------------
Message: 4
Date: Thu, 9 Jun 2011 14:23:23 -0400
From: "Bob Bruninga" <bruninga@xxxx.xxx>
Subject: [amsat-bb] Re: [aprssig] FW: NASA Ames Phonesat Balloon
Launch
To: "'TAPR APRS Mailing List'" <aprssig@xxxx.xxx>,
<amsat-bb@xxxxx.xxx>
Message-ID: <012801cc26d2$5109b4c0$f31d1e40$@xxx>
Content-Type: text/plain; charset="US-ASCII"
Balloon is up!
http://aprs.fi/KF7ODR-1
But their main interest is their UHF packet downlink on 437.092
-----Original Message-----
From: aprssig-bounces@xxxx.xxx [mailto:aprssig-bounces@xxxx.xxxx On Behalf
Of Bob Bruninga
Sent: Thursday, June 09, 2011 9:28 AM
To: amsat-bb@xxxxx.xxx
Cc: 'TAPR APRS Mailing List'
Subject: [aprssig] FW: NASA Ames Phonesat Balloon Launch
APRS Balloon launch today from California Bay area!
> On Thursday 9 June we will be doing a high-altitude balloon
> launch of our prototype Phonesat spacecraft.... It will have
> a separate APRS VHF beacon, but what we're really interested
> is collecting the data from the satellite's UHF beacon.
> It would be great if people can ...send us back any data
> to to mikesafyan@xxxxx.xxx
PhoneSat Details:
- Frequency: 437.092MHz AX.25 AFSK
- PhoneSat Callsign(s): KJ6KKZ (primary), K5RDY (temporarily during a
reboot)
- Twitter: http://twitter.com/#!/NASA_Phonesat, follow us for live updates!
Balloon/APRS Details:
- Launch Time: 10-10:30AM (PDT?) (follow twitter for updates)
- Launch Location: Valverde Park (outside of Manteca)
- APRS tracking: Callsign KF7ODR-1
Predicted Path:
http://habhub.org/predict/#!/uuid=e4826f7ae71c69c1abac515a20d8e821b20f78bf
Also, here is an article on their previous flight:
http://www.foxnews.com/scitech/2011/02/11/cell-phones-space-smartphone-nasa/
73,
The PhoneSat team
_______________________________________________
aprssig mailing list
aprssig@xxxx.xxx
https://www.tapr.org/cgi-bin/mailman/listinfo/aprssig
------------------------------
Message: 5
Date: Thu, 9 Jun 2011 14:06:03 -0400
From: "Tom Schaefer, NY4I" <ny4i@xxxx.xxx>
Subject: [amsat-bb] Re: SSB Operation on the Satellites
To: David Palmer KB5WIA <kb5wia@xxxxx.xxx>
Cc: amsat-bb@xxxxx.xxxx n0jy@xxxxxxx.xxx
Message-ID: <93972078-9659-4A59-A575-91DBAE5F6054@xxxx.xxx>
Content-Type: text/plain; charset=iso-8859-1
This is a great thread.
Well, I am going to continue with full doppler and just resolve myself to
tuning in some people that are not quite there yet. As a lot, I would think
adding computer control to handle full doppler would not be that big a deal
nowadays as most of the programs support it. I am not telling you how to
spend your money though. The big test will be at Field Day when I am using
full doppler and listening to everyone do the doppler-shuffle. :)
See you on the air as W4TA from Field Day but NEVER on an FM bird.
73,
Tom Schaefer, NY4I
ny4i@xxxx.xxx
EL88pb
Monitoring EchoLink node KJ4FEC-L 489389
DSTAR Capable APRS: NY4I-15
On Jun 9, 2011, at 1:19 PM, David Palmer KB5WIA wrote:
> Jerry's correct. If you only adjust your transmit frequency, such
> that your receive frequency appears to stay the same -- then you're
> automatically correcting for your own downlink doppler, but not for
> anyone elses. Other hams in the footprint will still have to chase
> you. The only way to stick with the "one true rule" is to adjust
> *both* uplink and downlink during the pass.
>
> That being said, adjusting the higher (UHF) transmit frequency on
> VO-52 and AO-07 only (ie. manual control) will get you pretty close,
> and you won't drift a whole lot. I hear plenty of hams doing this, as
> long as there are just one or a two QSO's going on, they don't drift
> into each other very often.
>
> 73 de Dave KB5WIA / CM88
> SatPC32 with 2xFT817ND
>
> On Thu, Jun 9, 2011 at 7:35 AM, <n0jy@xxxxxxx.xxx> wrote:
>> OK my brain may be playing tricks, but if you vary only your transmit
>> frequency such that you always hear yourself on the same downlink
>> frequency, isn't it true that the other station may not necessarily be
>> hearing you on the same downlink frequency and is chasing you anyway?
>> Your doppler is +5kHz (for example) on the receive, the bird is just about
>> to pass overhead of me though so my receive ferquency goes rapidly from
>> +2kHz to -5kHz, your transmit tuning has no relation at all to what
>> frequency I am listening on. Then the bird goes past you and you suddenly
>> switch down 5kHz, so I have to follow you on my receive.
>>
>> Or am I nuts? (Quite possible, come see where I work and you will
>> understand!)
>>
>> Jerry
>> N?JY
>>
>>> I always varied the transmit.
>>>
>>> This way the person I'm talking to as well as any other listeners are
>>> all on the same freq listening.
>>>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 6
Date: Thu, 9 Jun 2011 11:07:10 -0700 (PDT)
From: George Henry <ka3hsw@xxx.xxx>
Subject: [amsat-bb] Re: VO52 and verticals
To: John Geiger <aa5jg@xxxxxxx.xxx>, AMSAT <amsat-bb@xxxxx.xxx>
Message-ID: <629698.95196.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
As I currently live in an antenna-restricted subdivision, I have been
experimenting with low-profile antennas for a couple of years now. My
experience has been that verticals are "iffy" for a couple of reasons: not
enough gain at low elevations when the path is longest, a deep null above 40
degrees or so, and fades due to polarization mis-matches. That being said, I
seem to do alright on VO-52 right now with a 1/4 wave UHF groundplane on the
uplink and a well-hidden 2-meter Eggbeater on the downlink, at elevations
between about 20 and 40 degrees.
I am in the process of building a turnstile for 437, which I hope will improve
both my uplink on VO-52 as well as my downlink on all the other birds.
George, KA3HSW
----- Original Message ----
> From: John Geiger <aa5jg@xxxxxxx.xxx>
> To: AMSAT-BB <amsat-bb@xxxxx.xxx>
> Sent: Thu, June 9, 2011 11:35:50 AM
> Subject: [amsat-bb] VO52 and verticals
>
> Has anyone had success getting into VO52 using a vertical, omnidirectional
> antenna on the uplink. I have a nice M2 2M9SSB for 2m but only have a
> dualband J pole to cover UHF with and wonder if I could get into VO52 with
> it for my uplink antenna.
>
> 73s John AA5JG
------------------------------
_______________________________________________
Sent via amsat-bb@xxxxx.xxx. Opinions expressed are those of the author.
Not an AMSAT member? Join now to support the amateur satellite program!
http://amsat.org/mailman/listinfo/amsat-bb
End of AMSAT-BB Digest, Vol 6, Issue 316
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