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CX2SA > SATDIG 08.12.08 02:53l 778 Lines 28070 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. AO-7 Mode A Antenna? (Sebastian)
2. Re: ARISS downlink frequencies (Ransom, Kenneth G. (JSC-OC)[BAR])
3. Re: AO-7 Mode A Antenna? (n3tl@xxxxxxxxx.xxxx
4. D-STAR repeater problems in Copenhagen (OZ1MY)
5. Question re rx/tx relays and diplexer (RFI-EMI-GUY)
6. Re: AO-7 Mode A Antenna? (Jim Leder)
7. Re: Cross Band Repeater Active (Trevor)
8. AMSAT-BB Digest AO-51 & SO-50 Yaesu VX-7R (ki6rrq)
9. Re: AMSAT-BB Digest AO-51 & SO-50 Yaesu VX-7R (n3tl@xxxxxxxxx.xxxx
10. Re: D-STAR repeater problems in Copenhagen (G0MRF@xxx.xxxx
11. WiSP Load Keps (Ron Miles)
12. Re: ISS/MKS sending SSTV (Gordon JC Pearce MM3YEQ)
13. Re: D-STAR repeater problems in Copenhagen (Trevor)
14. Re: AO-7 Mode A Antenna? (Nigel Gunn G8IFF/W8IFF)
----------------------------------------------------------------------
Message: 1
Date: Sun, 7 Dec 2008 15:14:11 -0500
From: Sebastian <w4as@xxxxxxxxx.xxx>
Subject: [amsat-bb] AO-7 Mode A Antenna?
To: AMSAT BB <AMSAT-BB@xxxxx.xxx>
Message-ID: <453D10C8-E063-43E7-8DFD-67F8E58C70C1@xxxxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII; format=flowed; delsp=yes
I have a Yaesu FT-847 which is dedicated for satellite work, so I
don't have any HF antennas connected to it.
I'd like to know from those on the group who are (were) using AO-7
Mode A (10 meter receive), what type of antenna you are using?
I really don't want to get a directional antenna for several reasons.
Also, is it possible to receive Mode A without the use of an external
preamp?
73 de W4AS
Sebastian
------------------------------
Message: 2
Date: Sun, 7 Dec 2008 14:13:13 -0600
From: "Ransom, Kenneth G. (JSC-OC)[BAR]" <Kenneth.G.Ransom@xxxx.xxx>
Subject: [amsat-bb] Re: ARISS downlink frequencies
To: "Ronald G. Parsons" <w5rkn@xxxxx.xxx>, "amsat-bb"
<amsat-bb@xxxxx.xxx>
Message-ID:
<A2862DA1C49F4145AF6C2A452829403501C91A8E@xxxxxxxxxx.xxx.xxxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
No uplink operations occur on 145.80 to reduce the risk of inteference to the
ISS downlink for school contacts. ISS did have packet downlinked on 145.80
also (yet another uplink) but was migrated to 145.825 to support operations
with other digital satellites (like PCSAT).
Kenneth - N5VHO
________________________________
From: amsat-bb-bounces@xxxxx.xxx on behalf of Ronald G. Parsons
Sent: Sun 12/7/2008 1:59 PM
To: amsat-bb
Cc: Kenneth Ransom
Subject: [amsat-bb] ARISS downlink frequencies
ARISS currently has four modes, Packet Radio (1200 and 9600), Voice, Cross-
band repeater, and SSTV. All modes use 145.800 MHz as the downlink frequency
except Packet which uses 145.825.
These last and next few weeks have (and will be) very exciting as all these
modes are being used. I currently keep several programs running just in case a
mode change occurs. I am using Ham Radio Deluxe for SSTV, AGWTracker for
Packet, and SatPC32 and SatPC32ISS for frequency control for all modes with my
Icom IC-910H.
Why couldn't Packet operate on 145.800 simplex instead of 145.825? Then one
could just listen to 145.800 and tell which mode is being used. Currently I
must switch between 800 and 825 if no mode is apparent.
Ron W5RKN
_______________________________________________
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: 3
Date: Sun, 07 Dec 2008 20:33:00 +0000
From: n3tl@xxxxxxxxx.xxx
Subject: [amsat-bb] Re: AO-7 Mode A Antenna?
To: Sebastian <w4as@xxxxxxxxx.xxx>, AMSAT BB <AMSAT-BB@xxxxx.xxx>
Message-ID:
<120720082033.7899.493C32FB000D28EE00001EDB22193100029B0A02D2089B9A019C0
4040A0DBF049BCC02@xxx.xxx>
Content-Type: text/plain
Sebastian,
I recently put up roughly 200 feet of wire, end-fed, on the east side of my
house to get some kind of HF antenna in the air. I haven't had any trouble at
all here copying the 10-meter downlink on my 817 and my 857 from about 20
degrees to 20 degrees without any kind of preamp. It's actually been a
pleasant surprise - and a nice bonus to the HF work I can do now.
Those who are regulars here on the board have an idea of some of the goofy
things I try just to see what will and won't work the satellites. I've also
had contacts on both working FM LEO satellites and on AO-16 transmitting
through an eFactor 0-gain omni and listening on the longwire. Of course it's
nowhere near as effective as using an antenna designed and intended for
satellite work, but that doggone hunk o'wire hears OK. :)
Oh ... and I don't have it hung in a straight line. That would be too easy! It
runs from the feedpoint northeast about 60 feet, due east about 70 feet, then
back west about 70 feet. When I use it as a satellite-receive antenna, I
connect it directly to the receive radio I'm using. No tuner - just 200 feet
of wire to capture whatever it can.
I don't know how much help this is, but I thought you should know that
consistently receiving AO-7 Mode A is possible without a lot of time and money
invested.
73 to all,
Tim
-------------- Original message from Sebastian <w4as@xxxxxxxxx.xxx>: ---------
-----
> I have a Yaesu FT-847 which is dedicated for satellite work, so I
> don't have any HF antennas connected to it.
>
> I'd like to know from those on the group who are (were) using AO-7
> Mode A (10 meter receive), what type of antenna you are using?
>
> I really don't want to get a directional antenna for several reasons.
> Also, is it possible to receive Mode A without the use of an external
> preamp?
>
> 73 de W4AS
> Sebastian
>
> _______________________________________________
> 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: 4
Date: Sun, 7 Dec 2008 21:33:44 +0100
From: "OZ1MY" <oz1my@xxxxxx.xx>
Subject: [amsat-bb] D-STAR repeater problems in Copenhagen
To: "AMSAT-BB" <amsat-bb@xxxxx.xxx>
Message-ID: <001b01c958ab$1a14ea40$6401a8c0@xxxxxx.xx>
Content-Type: text/plain; charset="iso-8859-1"
Hi all,
During December and during the last large activity on
the ISS, some of us here in Copenhagen have had problems
with a D-STAR repeater on 145.7875 MHz.
Do any of you have a measurement of the spectrum of
the D-STAR transmissions ?
The theoretic spectrum should be more than 60 dB down
on 145.800 MHz,but that does not seem to be the case.
Including doppler the downlink from ISS is 145.796 MHz, when
it is going away from us to the East, which is the direction
of the repeater :-(
Personally I am just 6 km away from the repeater with
no obstructions on the pass from it.
To avoid flames - no I have nothing against D-STAR :-)
73 OZ1MY
Ib
------------------------------
Message: 5
Date: Sun, 07 Dec 2008 17:04:01 -0500
From: RFI-EMI-GUY <Rhyolite@xxxxxxxx.xxx>
Subject: [amsat-bb] Question re rx/tx relays and diplexer
To: amsat-bb@xxxxx.xxx
Message-ID: <493C4851.4020507@xxxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
All the ones I have seen do not short the unused port.
--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"?
"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."
"Follow The Money" ;-P
------------------------------
Message: 6
Date: Sun, 7 Dec 2008 17:14:57 -0500
From: "Jim Leder" <k8cxm@xxxx.xxx>
Subject: [amsat-bb] Re: AO-7 Mode A Antenna?
To: "Amsat" <AMSAT-BB@xxxxx.xxx>, "Sebastian" <w4as@xxxxxxxxx.xxx>
Message-ID: <1AE962D0F0F34DE0AF8CA9925A924749@xxxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi Sebastian,
I do a little operating on AO7 mode A, and find it depends. I have 3 usable
antennas that work OK on 10: an R5 vertical, a 10M dipole and a 160M
inverted L. Usually the L is best on receive, followed by the dipole and the
R5 is last. However, for whatever reason, sometimes the order is reversed.
As Tim said, even a simple longwire can work just fine.
Jim Bob Buckeye
AKA
**** Jim Leder****
K8CXM since 1961
IBM retiree since 1999
There are 10 types of people in this world -- those who understand binary
and those who don't.
----- Original Message -----
From: "Sebastian" <w4as@xxxxxxxxx.xxx>
To: "AMSAT BB" <AMSAT-BB@xxxxx.xxx>
Sent: Sunday, December 07, 2008 3:14 PM
Subject: [amsat-bb] AO-7 Mode A Antenna?
>I have a Yaesu FT-847 which is dedicated for satellite work, so I
> don't have any HF antennas connected to it.
>
> I'd like to know from those on the group who are (were) using AO-7
> Mode A (10 meter receive), what type of antenna you are using?
>
> I really don't want to get a directional antenna for several reasons.
> Also, is it possible to receive Mode A without the use of an external
> preamp?
>
> 73 de W4AS
> Sebastian
>
> _______________________________________________
> 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: 7
Date: Sun, 7 Dec 2008 22:48:53 +0000 (GMT)
From: Trevor <m5aka@xxxxx.xx.xx>
Subject: [amsat-bb] Re: Cross Band Repeater Active
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Message-ID: <304846.42241.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
Thanks for that David as I'd completely missed Curts original post with the
Subject of "YESSS!"
73 Trevor M5AKA
--- On Fri, 5/12/08, David Barber <david.barber@xxxxxxxxxxxxx.xx.xx> wrote:
> From: David Barber <david.barber@xxxxxxxxxxxxx.xx.xx>
> Subject: [amsat-bb] Cross Band Repeater Active
> To: amsat-bb@xxxxx.xxxx sarex@xxxxx.xxx
> Date: Friday, 5 December, 2008, 7:44 PM
> Just in case you missed Curt's posting.
>
> Cross Band Repeater is active.
>
>
> Good luck.
>
> _______________________________________________
> 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: 8
Date: Sun, 7 Dec 2008 14:49:29 -0800
From: "ki6rrq" <ki6rrq@xxx.xxx>
Subject: [amsat-bb] AMSAT-BB Digest AO-51 & SO-50 Yaesu VX-7R
To: <amsat-bb@xxxxx.xxx>
Message-ID:
<20081207224928.OBWR12838.fed1rmmtao103.cox.net@xxxxxxxxxxxx.xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
I am currently using a Yaesu VX-7R (not the best for satellites, also using
it because that's what I had)for the ISS and the FM birds. I don't know if
this will help anyone but I found using the memory tune feature is very
helpful for working the Doppler, I don't know if your TH-F6A or many other
HT's have it but I think it saves me a little time and hassle, when the
receive frequency is on 2 meters, anyway. I know the FT-60's have it too.
For AO-51, I save a memory channel with the 2 meter receive freq and then
add the odd split or odd band split to the TX part of that memory and the pl
where appropriate ... Then when I use it out in the field on my Arrow II, I
bring up the memory and then select the memory tuning mode, which I guess is
similar to the VFO mode but keeps the TX side in place and allows me to tune
the RX frequency up and down to adjust for the Doppler and all I have to do
is push the PTT when I make my call and the 2 meter TX frequency is
automatically used. I don't even have to hold the radio, just get my
fingers to the dial tuning knob, a few times during the pass. (tripod
mounted radio, per my qrz.com) I haven't found its worth worrying about
the Doppler on the 2 meter side, since the radio only does 5k at a time.
After trying numerous methods, I found this to be easiest, with everything
else you have to deal with on a mobile sat. operation; writing calls down,
keeping the antenna on the bird, testing for polarity alignment, dealing
with the dark, oh yea what was that guys call again... Its like an Apollo 13
rescue mission to get it all done... except its always a fun ride... LOL, I
needed to simplify everything.
Best Rich KI6RRQ
------------------------------
Message: 2
Date: Sun, 7 Dec 2008 13:42:01 -0500
From: "Jim Leder" <k8cxm@xxxx.xxx>
Subject: [amsat-bb] Re: Kenwood TH-F6A for AO-51 / SO-50??
To: "Amsat" <AMSAT-BB@xxxxx.xxx>, "Guy Brauning"
<guyjeanbraun@xxxxxxx.xxx>
Message-ID: <547D1F8574B04DDC801A1FD71EB224FE@xxxxxxxxxxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
I have used my Kenwood TH-F6A along with an Arrow antenna, and IMHO it works
just fine. You do need to get it programmed right and you need to get used
to switching between VFOs as you track the satellite and the Doppler effect
on frequency. It is NOT a full duplex radio like the W32A, and you will not
be able to hear yourself, but I have never felt that's been a problem.. I
programmed mine to transmit on one VFO (uplink) and be able to receive on
several different frequencies (downlink) on the other VFO. On the transmit
VFO, the squelch is closed all the way, while on the receive VFO, it's open
all the way. So, VFO A is set for uplink of 145.920 on memory channel 150
and on memory channels 152-153 I have them programmed for 435.290 and
435.295 (downlink which is in VFO B). 154 is center frequency of 435.300 and
of course 155 and 156 are set to 435.305 and 435.310. By switching between
VFOs I can change downlink channels/frequencies to fit the Doppler shift. A
little cumbersome, but that little radio works very well. You can follow a
similar scheme on the QRP channel of AO51 (mine is 160-166) and SO50 (mine
is 170-176-get the picture). I have made several contacts with it on the QRP
channels but have had no luck on SO50, which is a lot more difficult
satellite to hear.
I'm using it because it's what I had, and I'm happy to say with a little
use and practice you quickly get the hang of it.
Of course, either the W32A or the Kenwood TH-D7A do FULL duplex, but both
are no longer in production. Hearing yourself is nice, but not necessary.
Jim Bob Buckeye
AKA
**** Jim Leder****
K8CXM since 1961
IBM retiree since 1999
------------------------------
Message: 9
Date: Sun, 07 Dec 2008 23:10:51 +0000
From: n3tl@xxxxxxxxx.xxx
Subject: [amsat-bb] Re: AMSAT-BB Digest AO-51 & SO-50 Yaesu VX-7R
To: "ki6rrq" <ki6rrq@xxx.xxx>, <amsat-bb@xxxxx.xxx>
Message-ID:
<120720082310.23342.493C57FB00006CDC00005B2E22193100029B0A02D2089B9A019C
04040A0DBF049BCC02@xxx.xxx>
Content-Type: text/plain
Rich,
Thank you for posting this. I never thought to mention the Memory Tune
feature, which is, indeed, very useful. Like you, I began using the VX-7R on
the satellites because it is what I had at the time. I have no intention of
trading mine until some company brings a new radio to market with full duplex
capability.
It permitted me to earn Satellite VUCC, all handheld, and the AMSAT
Achievement Award - the latter using only 50 mW contacts (21 states, Mexico
and Ontario) made on the same set of 2 AA Duracells. I also made four contacts
through the ISS U/V repeater over the weekend with it.
As you say, it may not be the best for the satellites. But it's more-than-
good-enough for me.
Also, here's a tip that, I hope, you'll find to decrease your stress level on
every pass. Get a small digital voice recorder that has a time counter, and
just record your passes - even if it's just the wild sound. I have done that
since Day 1 with a small recorder I can clip to my shirt collar or pocket. I
don't worry about writing down calls at all. I start the tape on an even
minute (e.g., if my AOS is at 23:15:12, I start the recorder at 23:12:00. I
speak that time into the condenser mic, and include the satellite I'm working.
After the pass, I just come in and replay the tape, which allows me to synch
calls and times correctly for logging purposes. It also gives me a chance to
MP3 clips from contacts I want to keep. The "wild sound" quality isn't as good
as having a full duplex radio and having the recorder connected to the audio
out jack, but it's the only way to get boths sides of a contact since the VX-
7R operates only semi-duplex.
73 to all,
Tim - N3TL
AMSAT Member No. 36820
QRP-ARCI Member No. 5547
ARRL Member No. 7027180
Athens, Ga. - EM84ha
-------------- Original message from "ki6rrq" <ki6rrq@xxx.xxx>: --------------
> I am currently using a Yaesu VX-7R (not the best for satellites, also using
> it because that's what I had)for the ISS and the FM birds. I don't know if
> this will help anyone but I found using the memory tune feature is very
> helpful for working the Doppler, I don't know if your TH-F6A or many other
> HT's have it but I think it saves me a little time and hassle, when the
> receive frequency is on 2 meters, anyway. I know the FT-60's have it too.
>
> For AO-51, I save a memory channel with the 2 meter receive freq and then
> add the odd split or odd band split to the TX part of that memory and the pl
> where appropriate ... Then when I use it out in the field on my Arrow II, I
> bring up the memory and then select the memory tuning mode, which I guess is
> similar to the VFO mode but keeps the TX side in place and allows me to tune
> the RX frequency up and down to adjust for the Doppler and all I have to do
> is push the PTT when I make my call and the 2 meter TX frequency is
> automatically used. I don't even have to hold the radio, just get my
> fingers to the dial tuning knob, a few times during the pass. (tripod
> mounted radio, per my qrz.com) I haven't found its worth worrying about
> the Doppler on the 2 meter side, since the radio only does 5k at a time.
> After trying numerous methods, I found this to be easiest, with everything
> else you have to deal with on a mobile sat. operation; writing calls down,
> keeping the antenna on the bird, testing for polarity alignment, dealing
> with the dark, oh yea what was that guys call again... Its like an Apollo 13
> rescue mission to get it all done... except its always a fun ride... LOL, I
> needed to simplify everything.
>
> Best Rich KI6RRQ
>
> ------------------------------
>
> Message: 2
> Date: Sun, 7 Dec 2008 13:42:01 -0500
> From: "Jim Leder"
> Subject: [amsat-bb] Re: Kenwood TH-F6A for AO-51 / SO-50??
> To: "Amsat" , "Guy Brauning"
>
> Message-ID: <547D1F8574B04DDC801A1FD71EB224FE@xxxxxxxxxxxxx>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=original
>
> I have used my Kenwood TH-F6A along with an Arrow antenna, and IMHO it works
>
> just fine. You do need to get it programmed right and you need to get used
> to switching between VFOs as you track the satellite and the Doppler effect
> on frequency. It is NOT a full duplex radio like the W32A, and you will not
> be able to hear yourself, but I have never felt that's been a problem.. I
> programmed mine to transmit on one VFO (uplink) and be able to receive on
> several different frequencies (downlink) on the other VFO. On the transmit
> VFO, the squelch is closed all the way, while on the receive VFO, it's open
> all the way. So, VFO A is set for uplink of 145.920 on memory channel 150
> and on memory channels 152-153 I have them programmed for 435.290 and
> 435.295 (downlink which is in VFO B). 154 is center frequency of 435.300 and
>
> of course 155 and 156 are set to 435.305 and 435.310. By switching between
> VFOs I can change downlink channels/frequencies to fit the Doppler shift. A
> little cumbersome, but that little radio works very well. You can follow a
> similar scheme on the QRP channel of AO51 (mine is 160-166) and SO50 (mine
> is 170-176-get the picture). I have made several contacts with it on the QRP
>
> channels but have had no luck on SO50, which is a lot more difficult
> satellite to hear.
> I'm using it because it's what I had, and I'm happy to say with a little
> use and practice you quickly get the hang of it.
> Of course, either the W32A or the Kenwood TH-D7A do FULL duplex, but both
> are no longer in production. Hearing yourself is nice, but not necessary.
>
> Jim Bob Buckeye
> AKA
> **** Jim Leder****
> K8CXM since 1961
> IBM retiree since 1999
>
> _______________________________________________
> 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: 10
Date: Sun, 7 Dec 2008 18:28:07 EST
From: G0MRF@xxx.xxx
Subject: [amsat-bb] Re: D-STAR repeater problems in Copenhagen
To: oz1my@xxxxxx.xxx amsat-bb@xxxxx.xxx
Message-ID: <cef.49140e71.366db607@xxx.xxx>
Content-Type: text/plain; charset="US-ASCII"
Hello Ib.
Interesting allocation for D-Star.
-60dB at 145.800 may sound suitable, but in practice what matters is how
many dB down it is at 145.800 minus one half of the bandwidth of your IF
filter.
Ball park.........
So -4kHz of doppler and -7.5kHz for a narrow FM filter gives your receivers
bandpass down to 145.7885 MHz just 10k above the D-Star
Which means the two are probably going to overlap.
73
David
In a message dated 07/12/2008 20:34:56 GMT Standard Time, oz1my@xxxxxx.xx
writes:
The theoretic spectrum should be more than 60 dB down
on 145.800 MHz,but that does not seem to be the case.
Including doppler the downlink from ISS is 145.796 MHz, when
it is going away from us to the East, which is the direction
of the repeater :-(
Personally I am just 6 km away from the repeater with
no obstructions on the pass from it.
------------------------------
Message: 11
Date: Sun, 7 Dec 2008 15:31:09 -0800
From: "Ron Miles" <conimicut@xxxxx.xxx>
Subject: [amsat-bb] WiSP Load Keps
To: amsat-bb@xxxxx.xxx
Message-ID:
<ca0df3900812071531g76909a4dta4306e1128455a21@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
First time user of WiSP32.
I've set AO-51 as my satellite of choice. However, a message pops up "GSC
cannot find satellite AO-51 in Keplerian database". My question is how do
I load my Celestrak file into the WiSP Keps database.
Right now there's an empty folder for AO-51 in the Database.
TIA
73, Ron
AMSAT #23760
------------------------------
Message: 12
Date: Sun, 07 Dec 2008 23:32:32 +0000
From: Gordon JC Pearce MM3YEQ <gordonjcp@xxxx.xxx>
Subject: [amsat-bb] Re: ISS/MKS sending SSTV
To: amsat <amsat-bb@xxxxx.xxx>
Message-ID: <493C5D10.6020909@xxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Scott Richardson wrote:
> I copied inside ISS SSTV images at 1640z and pictures out the window at
> 1815z. I always miss the first second or two transmitted because of my
> setup. It would be great to have a CW ID ahead of each SSTV transmission. I
> heard this once during Richard Garriott's time on the station and it took
> the guesswork out of when I should press 'record'.
I just start recording at the beginning of a pass, stop at the end, and
decode the images (if there are any) as I play back the recording. Now,
if I could just tune my radio remotely to follow the doppler shift, I'd
be all set for unattended reception!
Gordon
------------------------------
Message: 13
Date: Sun, 7 Dec 2008 23:52:29 +0000 (GMT)
From: Trevor <m5aka@xxxxx.xx.xx>
Subject: [amsat-bb] Re: D-STAR repeater problems in Copenhagen
To: amsat-bb@xxxxx.xxx
Message-ID: <147335.82155.qm@xxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
D-STAR repeaters should theoretically be less of a problem on 145.7875 MHz
than 2.5 kHz deviation FM repeaters as they have a slightly narrower
bandwidth.
The use of 145.7875 assumes that people are using 2.5 kHz deviation FM radios
fitted with filters with an 8 kHz bandwidth at -6db and max 16 kHz BW at -60
db, however, in practice most Amateur rigs don't meet that spec. Realistically
anyone within 15 km of an FM or D-STAR repeater on 145.7885 is going to find
the ISS downlink gets clobbered.
The IARU bandplan allocates 145.800-146.000 MHz to the Amateur Satellite
service, doppler causes the 5 kHz deviation ISS signal to be below 145.8 thus
there is a conflict with the IARU Region 1 2.5 kHz deviation FM repeater
output channel on 145.7875.
Lets hope that eventually the ICOM and Kenwood NXDN? 6.25 kHz channel spacing
Digital Voice standard is adopted for 2 metre repeaters as a replacement for
FM with an upper channel limit of 145.7875 MHz.
73 Trevor M5AKA
--- On Sun, 7/12/08, G0MRF@xxx.xxx <G0MRF@xxx.xxx> wrote:
> From: G0MRF@xxx.xxx <G0MRF@xxx.xxx>
> Subject: [amsat-bb] Re: D-STAR repeater problems in Copenhagen
> To: oz1my@xxxxxx.xxx amsat-bb@xxxxx.xxx
> Date: Sunday, 7 December, 2008, 11:28 PM
> Hello Ib.
>
> Interesting allocation for D-Star.
>
> -60dB at 145.800 may sound suitable, but in practice what
> matters is how
> many dB down it is at 145.800 minus one half of the
> bandwidth of your IF filter.
>
> Ball park.........
> So -4kHz of doppler and -7.5kHz for a narrow FM filter
> gives your receivers
> bandpass down to 145.7885 MHz just 10k above the D-Star
>
> Which means the two are probably going to overlap.
>
> 73
>
> David
>
>
>
>
> In a message dated 07/12/2008 20:34:56 GMT Standard Time,
> oz1my@xxxxxx.xx
> writes:
>
>
> The theoretic spectrum should be more than 60 dB down
> on 145.800 MHz,but that does not seem to be the case.
> Including doppler the downlink from ISS is 145.796 MHz,
> when
> it is going away from us to the East, which is the
> direction
> of the repeater :-(
>
> Personally I am just 6 km away from the repeater with
> no obstructions on the pass from it.
>
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those
> of the author.
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------------------------------
Message: 14
Date: Mon, 08 Dec 2008 00:12:27 +0000
From: Nigel Gunn G8IFF/W8IFF <nigel@xxxxx.xxx>
Subject: [amsat-bb] Re: AO-7 Mode A Antenna?
To: Sebastian <w4as@xxxxxxxxx.xxx>
Cc: AMSAT BB <AMSAT-BB@xxxxx.xxx>
Message-ID: <493C666B.3020109@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Crossed dipoles over a reflector.
Sebastian wrote:
> I have a Yaesu FT-847 which is dedicated for satellite work, so I
> don't have any HF antennas connected to it.
>
> I'd like to know from those on the group who are (were) using AO-7
> Mode A (10 meter receive), what type of antenna you are using?
>
> I really don't want to get a directional antenna for several reasons.
> Also, is it possible to receive Mode A without the use of an external
> preamp?
>
> 73 de W4AS
> Sebastian
>
> _______________________________________________
> 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!
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>
--
<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
Nigel A. Gunn. G8IFF W8IFF (have also held KC8NHF, M0NHF, 9H3GN)
1865 El Camino Drive, Xenia, OH 45385-1115, USA 937 825 5032
e-mail nigel@xxxxx.xxx www http://www.ngunn.net
Member of ARRL, GQRP #11396, QRPARCI #11644, SOC #548, Flying Pig #385,
Dayton ARA #2128, AMSAT-NA LM-1691, AMSAT-UK, MKARS,
ALC
<><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><><>
------------------------------
_______________________________________________
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!
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End of AMSAT-BB Digest, Vol 3, Issue 638
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