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CX2SA > SATDIG 10.03.17 22:24l 964 Lines 33396 Bytes #999 (0) @ WW
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Today's Topics:
1. Opinions on improving receive for portable ops (Ka9p@xxx.xxxx
2. Re: Best HT for satellite operation?
(Patrick STODDARD (WD9EWK/VA7EWK))
3. Best HT for satellite operation? (Clayton Coleman)
4. Re: Best HT for satellite operation? (John Geiger)
5. Re: Best HT for satellite operation? (Paul Stoetzer)
6. Re: Best HT for satellite operation? (skristof@xxxxxxx.xxxx
7. Re: Best HT for satellite operation? (Paul Stoetzer)
8. Kenwood TS-2000X on satellite (Vincenzo Mone)
9. Re: Best HT for satellite operation? (Mike Diehl)
10. AO-73/FUNcube Mode change (Jim Heck)
11. Re: Opinions on improving receive for portable ops (David Swanson)
12. Re: Best HT for satellite operation?
(Patrick STODDARD (WD9EWK/VA7EWK))
----------------------------------------------------------------------
Message: 1
Date: Fri, 10 Mar 2017 12:24:51 -0500
From: Ka9p@xxx.xxx
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Opinions on improving receive for portable ops
Message-ID: <34a86c.64a9493.45f43b63@xxx.xxx>
Content-Type: text/plain; charset="US-ASCII"
I've just started getting on the linear transponders in the last month or
so after a 30 year absence from sat work, necessarily with a portable setup,
and would be eager to hear experienced opinions on what to do next to
improve receive.
I'm running Cheap Yagis on V(3 el) and U(6 el), diplexers, about 10 feet of
RG8X, and receiving on an FT817 or 897, usually on FO29 and the XW's, and
have up to 25 watts available for the uplink.
Q's are:
1) with those radios and only about 10 feet of feed line, will a preamp
help much on 432?
2) If it will, is the 50$ preamp on the AMSAT site a good start? Or? and
3) With relatively short yagis, will it make a noticeable difference going
to circular polarization?
WRT to 3, I've pretty much exhausted what I can find the internet, but just
don't have a pragmatic sense for what it will do in terms of evening out
reception over, say, an FO 29 pass - I read that you nominally lose 3 dbs
most all the time but may pick up a lot on the deep fades, but still not sure
how that translates to the real world.
Or is the answer that the set up is marginal enough I need to do it all of
the above if I want reliable communications above about 5 degrees or so?
Thanks for the bandwidth and any input.
Scott ka9p
------------------------------
Message: 2
Date: Fri, 10 Mar 2017 10:36:22 -0700
From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb@xxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Best HT for satellite operation?
Message-ID:
<CAN6TEUd024sERpDmuLf5pd5w749idKhHVs9Umm4XmFO3LSAdTg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
Dale,
As has been pointed out, there have been many HTs over the years
that allow for cross-band full-duplex operation. This was actually
a more common feature in the 1990s, and has gradually disappeared
from HTs since then. A few years ago, Andrew KE5GDB had a list of
HTs and other radios that supported cross-band full-duplex
operation on his web site. That web page is gone, but lives on
in the Internet Archive's Wayback Machine at:
http://web.archive.org/web/20090724094403/http://www.
thathamkid.com/website/ham-radio/full-duplex-radios
For HTs, you could add the TH-D72 to this list, which came out at
the end of 2010.
In addition to those HTs, there are a few others that allow for
cross-band full-duplex operation in one direction, where you are
transmitting on 70cm and listening on 2m. I wrote a bit about
a few of the Chinese-made HTs that are able to work AO-85 full-
duplex in a series of posts here on the -BB in late 2015. One
message I posted in December 2015 that had links to the other
posts I made about those radios is available at:
http://amsat.org/pipermail/amsat-bb/2015-December/056269.html
The 70cm receivers in these Chinese-made HTs suffer from desense
whenever you transmit on 2m. These radios can be programmed with
groups of memory channels to work V/U FM satellites like SO-50
half-duplex, or you could use the two VFOs to do that without the
need to program memory channels.
Using separate radios for uplink and downlink is also a good way
to have a full-duplex setup. Many have even used a pair of the
inexpensive Baofeng-type HTs to have a station capable of full-
duplex operation, or one Baofeng-type radio paired with an HT from
one of the traditional ham manufacturers.
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
Twitter: @xxxxxx
On Thu, Mar 9, 2017 at 4:25 PM, Dale Kubichek via AMSAT-BB <
amsat-bb@xxxxx.xxx> wrote:
>
>
> Everyone wants 'full duplex', I've not seen a dual-band HT that can do
> 'real' RX while the PTT is pushed, period!
>
>
>
>
------------------------------
Message: 3
Date: Fri, 10 Mar 2017 12:15:31 -0600
From: Clayton Coleman <kayakfishtx@xxxxx.xxx>
To: AMSAT-BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Best HT for satellite operation?
Message-ID:
<CAPovOwfU3hBafuauUyykDMmh49xdeTS1VjV_DK5iwf1yBED16Q@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
I've seen a lot of great recommendations for satellite HT's. I really
prefer the Icom IC-910h. Since it is a little heavy for neck straps,
and the belt clip is made of 3/8" steel plate, I'd probably recommend
the BABYBJ?RN carrier approach. You can buy a 15 year old one at a
bargain price of $1000-1500 at most hamfests.
TGIF
Clayton
W5PFG
------------------------------
Message: 4
Date: Fri, 10 Mar 2017 12:17:47 -0600
From: John Geiger <af5cc2@xxxxx.xxx>
To: Clayton Coleman <kayakfishtx@xxxxx.xxx>
Cc: AMSAT-BB <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Best HT for satellite operation?
Message-ID:
<CAHC1P2-4d6t_OwE9z854TwU8Ug7ZSaN5W_MrqO15K=aj=UM5vg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
What sort of battery pack does that take?
On Fri, Mar 10, 2017 at 12:15 PM, Clayton Coleman <kayakfishtx@xxxxx.xxx>
wrote:
> I've seen a lot of great recommendations for satellite HT's. I really
> prefer the Icom IC-910h. Since it is a little heavy for neck straps,
> and the belt clip is made of 3/8" steel plate, I'd probably recommend
> the BABYBJ?RN carrier approach. You can buy a 15 year old one at a
> bargain price of $1000-1500 at most hamfests.
>
> TGIF
>
> Clayton
> W5PFG
> _______________________________________________
> 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: Fri, 10 Mar 2017 13:20:22 -0500
From: Paul Stoetzer <n8hm@xxxx.xxx>
To: Clayton Coleman <kayakfishtx@xxxxx.xxx>
Cc: AMSAT-BB <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Best HT for satellite operation?
Message-ID:
<CABzOSOqCo_kkn_6kgHC_tMqm8Ez2cEV0Xwjuz1LV9pokO7xHcg@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
If you find manual tuning to be a drag, I recommend mounting the 910 on a
backpack frame and using a laptop to tune with a laptop harness, as seen
here:
https://www.systemsdirect.com/products/fieldmate-user-harness
Hmm...now how do I shoulder mount that LEO Pack?
73,
Paul, N8HM
On Fri, Mar 10, 2017 at 1:15 PM, Clayton Coleman <kayakfishtx@xxxxx.xxx>
wrote:
> I've seen a lot of great recommendations for satellite HT's. I really
> prefer the Icom IC-910h. Since it is a little heavy for neck straps,
> and the belt clip is made of 3/8" steel plate, I'd probably recommend
> the BABYBJ?RN carrier approach. You can buy a 15 year old one at a
> bargain price of $1000-1500 at most hamfests.
>
> TGIF
>
> Clayton
> W5PFG
> _______________________________________________
> 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: Fri, 10 Mar 2017 13:21:53 -0500
From: skristof@xxxxxxx.xxx
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Best HT for satellite operation?
Message-ID: <56606d8dce381f6037ab6096be750953@xxxxxxx.xxx>
Content-Type: text/plain; charset=US-ASCII
I've used two Baofengs to work SO-50, and the V transmission from one
still desenses the U reception in the other one, even though they are
two separate radios.
Do I put low-pass filter in the transmission line to squash that third
harmonic?
Steve AI9IN
On 2017-03-10 12:36, Patrick STODDARD (WD9EWK/VA7EWK) wrote:
> Dale,
>
> As has been pointed out, there have been many HTs over the years
> that allow for cross-band full-duplex operation. This was actually
> a more common feature in the 1990s, and has gradually disappeared
> from HTs since then. A few years ago, Andrew KE5GDB had a list of
> HTs and other radios that supported cross-band full-duplex
> operation on his web site. That web page is gone, but lives on
> in the Internet Archive's Wayback Machine at:
>
> http://web.archive.org/web/20090724094403/http://www.
> thathamkid.com/website/ham-radio/full-duplex-radios
>
> For HTs, you could add the TH-D72 to this list, which came out at
> the end of 2010.
>
> In addition to those HTs, there are a few others that allow for
> cross-band full-duplex operation in one direction, where you are
> transmitting on 70cm and listening on 2m. I wrote a bit about
> a few of the Chinese-made HTs that are able to work AO-85 full-
> duplex in a series of posts here on the -BB in late 2015. One
> message I posted in December 2015 that had links to the other
> posts I made about those radios is available at:
>
> http://amsat.org/pipermail/amsat-bb/2015-December/056269.html
>
> The 70cm receivers in these Chinese-made HTs suffer from desense
> whenever you transmit on 2m. These radios can be programmed with
> groups of memory channels to work V/U FM satellites like SO-50
> half-duplex, or you could use the two VFOs to do that without the
> need to program memory channels.
>
> Using separate radios for uplink and downlink is also a good way
> to have a full-duplex setup. Many have even used a pair of the
> inexpensive Baofeng-type HTs to have a station capable of full-
> duplex operation, or one Baofeng-type radio paired with an HT from
> one of the traditional ham manufacturers.
>
> 73!
>
> Patrick WD9EWK/VA7EWK
> http://www.wd9ewk.net/
> Twitter: @xxxxxx
>
> On Thu, Mar 9, 2017 at 4:25 PM, Dale Kubichek via AMSAT-BB <
> amsat-bb@xxxxx.xxx> wrote:
>
>> Everyone wants 'full duplex', I've not seen a dual-band HT that can do
>> 'real' RX while the PTT is pushed, period!
> _______________________________________________
> 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: 7
Date: Fri, 10 Mar 2017 13:23:23 -0500
From: Paul Stoetzer <n8hm@xxxx.xxx>
To: Steve Kristoff <skristof@xxxxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Best HT for satellite operation?
Message-ID:
<CABzOSOrUum0HJTteQoRegDbXDbt7Lwyut7F2eRCngXCU7UUCSw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
That should work, though it may not be enough depending on the front end of
the other Baofeng.
You may find you need to use a receiver with a better front end to
eliminate desense, or two filters.
73,
Paul, N8HM
On Fri, Mar 10, 2017 at 1:21 PM, <skristof@xxxxxxx.xxx> wrote:
> I've used two Baofengs to work SO-50, and the V transmission from one
> still desenses the U reception in the other one, even though they are
> two separate radios.
>
> Do I put low-pass filter in the transmission line to squash that third
> harmonic?
>
> Steve AI9IN
>
> On 2017-03-10 12:36, Patrick STODDARD (WD9EWK/VA7EWK) wrote:
>
> > Dale,
> >
> > As has been pointed out, there have been many HTs over the years
> > that allow for cross-band full-duplex operation. This was actually
> > a more common feature in the 1990s, and has gradually disappeared
> > from HTs since then. A few years ago, Andrew KE5GDB had a list of
> > HTs and other radios that supported cross-band full-duplex
> > operation on his web site. That web page is gone, but lives on
> > in the Internet Archive's Wayback Machine at:
> >
> > http://web.archive.org/web/20090724094403/http://www.
> > thathamkid.com/website/ham-radio/full-duplex-radios
> >
> > For HTs, you could add the TH-D72 to this list, which came out at
> > the end of 2010.
> >
> > In addition to those HTs, there are a few others that allow for
> > cross-band full-duplex operation in one direction, where you are
> > transmitting on 70cm and listening on 2m. I wrote a bit about
> > a few of the Chinese-made HTs that are able to work AO-85 full-
> > duplex in a series of posts here on the -BB in late 2015. One
> > message I posted in December 2015 that had links to the other
> > posts I made about those radios is available at:
> >
> > http://amsat.org/pipermail/amsat-bb/2015-December/056269.html
> >
> > The 70cm receivers in these Chinese-made HTs suffer from desense
> > whenever you transmit on 2m. These radios can be programmed with
> > groups of memory channels to work V/U FM satellites like SO-50
> > half-duplex, or you could use the two VFOs to do that without the
> > need to program memory channels.
> >
> > Using separate radios for uplink and downlink is also a good way
> > to have a full-duplex setup. Many have even used a pair of the
> > inexpensive Baofeng-type HTs to have a station capable of full-
> > duplex operation, or one Baofeng-type radio paired with an HT from
> > one of the traditional ham manufacturers.
> >
> > 73!
> >
> > Patrick WD9EWK/VA7EWK
> > http://www.wd9ewk.net/
> > Twitter: @xxxxxx
> >
> > On Thu, Mar 9, 2017 at 4:25 PM, Dale Kubichek via AMSAT-BB <
> > amsat-bb@xxxxx.xxx> wrote:
> >
> >> Everyone wants 'full duplex', I've not seen a dual-band HT that can do
> >> 'real' RX while the PTT is pushed, period!
> > _______________________________________________
> > 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: 8
Date: Fri, 10 Mar 2017 19:39:57 +0100
From: "Vincenzo Mone" <vimone@xxxxx.xx>
To: "Amsat - BBs" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Kenwood TS-2000X on satellite
Message-ID:
<!&!AAAAAAAAAAAYAAAAAAAAALgqrd2N1rRAiaQvRd7pgRDCgAAAEAAAAJl8BkGWfTBBg8iW8SOBaL
8BAAAAAA==@xxxxx.xx>
Content-Type: text/plain; charset="us-ascii"
Hi folks,
Is there anybody using a TS-2000X for automatic satellites operations?
If yes please what are using to automate all?
Thanks
73 de Enzo IK8OZV
EasyLog 5 BetaTester
EasyLog PDA BetaTester
WinBollet BetaTester
D.C.I. CheckPoint Regione Campania
Skype: ik8ozv8520
*******************************************
****** GSM +39 328 7110193 ******
***** SMS +39 328 7110193 *****
*******************************************
------------------------------
Message: 9
Date: Fri, 10 Mar 2017 10:42:25 -0800
From: Mike Diehl <diehl.mike.a@xxxxx.xxx>
To: Paul Stoetzer <n8hm@xxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Best HT for satellite operation?
Message-ID: <130C2286-6B51-43FA-8A62-06A538F170CF@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
You may also want to consider adjusting your power level. SO-50 can be
worked with very little power and this may help with your desense.
73
Mike Diehl - AI6GS
> On Mar 10, 2017, at 10:23 AM, Paul Stoetzer <n8hm@xxxx.xxx> wrote:
>
> That should work, though it may not be enough depending on the front end of
> the other Baofeng.
>
> You may find you need to use a receiver with a better front end to
> eliminate desense, or two filters.
>
> 73,
>
> Paul, N8HM
>
>> On Fri, Mar 10, 2017 at 1:21 PM, <skristof@xxxxxxx.xxx> wrote:
>>
>> I've used two Baofengs to work SO-50, and the V transmission from one
>> still desenses the U reception in the other one, even though they are
>> two separate radios.
>>
>> Do I put low-pass filter in the transmission line to squash that third
>> harmonic?
>>
>> Steve AI9IN
>>
>>> On 2017-03-10 12:36, Patrick STODDARD (WD9EWK/VA7EWK) wrote:
>>>
>>> Dale,
>>>
>>> As has been pointed out, there have been many HTs over the years
>>> that allow for cross-band full-duplex operation. This was actually
>>> a more common feature in the 1990s, and has gradually disappeared
>>> from HTs since then. A few years ago, Andrew KE5GDB had a list of
>>> HTs and other radios that supported cross-band full-duplex
>>> operation on his web site. That web page is gone, but lives on
>>> in the Internet Archive's Wayback Machine at:
>>>
>>> http://web.archive.org/web/20090724094403/http://www.
>>> thathamkid.com/website/ham-radio/full-duplex-radios
>>>
>>> For HTs, you could add the TH-D72 to this list, which came out at
>>> the end of 2010.
>>>
>>> In addition to those HTs, there are a few others that allow for
>>> cross-band full-duplex operation in one direction, where you are
>>> transmitting on 70cm and listening on 2m. I wrote a bit about
>>> a few of the Chinese-made HTs that are able to work AO-85 full-
>>> duplex in a series of posts here on the -BB in late 2015. One
>>> message I posted in December 2015 that had links to the other
>>> posts I made about those radios is available at:
>>>
>>> http://amsat.org/pipermail/amsat-bb/2015-December/056269.html
>>>
>>> The 70cm receivers in these Chinese-made HTs suffer from desense
>>> whenever you transmit on 2m. These radios can be programmed with
>>> groups of memory channels to work V/U FM satellites like SO-50
>>> half-duplex, or you could use the two VFOs to do that without the
>>> need to program memory channels.
>>>
>>> Using separate radios for uplink and downlink is also a good way
>>> to have a full-duplex setup. Many have even used a pair of the
>>> inexpensive Baofeng-type HTs to have a station capable of full-
>>> duplex operation, or one Baofeng-type radio paired with an HT from
>>> one of the traditional ham manufacturers.
>>>
>>> 73!
>>>
>>> Patrick WD9EWK/VA7EWK
>>> http://www.wd9ewk.net/
>>> Twitter: @xxxxxx
>>>
>>> On Thu, Mar 9, 2017 at 4:25 PM, Dale Kubichek via AMSAT-BB <
>>> amsat-bb@xxxxx.xxx> wrote:
>>>
>>>> Everyone wants 'full duplex', I've not seen a dual-band HT that can do
>>>> 'real' RX while the PTT is pushed, period!
>>> _______________________________________________
>>> 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: 10
Date: Fri, 10 Mar 2017 19:21:54 -0000
From: "Jim Heck" <jim@xxxxxx.xx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] AO-73/FUNcube Mode change
Message-ID: <080190471CD646148F0F70B866B7130A@xxxxxx>
Content-Type: text/plain; charset="utf-8"
Hi folks,
I have just changed the sat into amateur (continuous transponder) mode.
Plan is to switch back to auto mode on Sunday pm UTC as usual.
Pls see below for other FUNcube transponder info
Have FUN with the transponder.
73s Jim G3WGM and the FUNcube team.
++++++++++++++++++++++++++++++++++
FUNcube frequencies and other details
++++++++++++++++++++++++++++++++++
AO-73 FUNcube-1
The transponder is normally operational only when the satellite is in
eclipse, ie the solar panels are NOT being illuminated. During weekends
(from pm Fridays UTC to PM Sundays UTC) the transponder is operational 24/7.
When the transponder is switched off, the telemetry beacon is on full power,
when the transponder is on the beacon it is on low power. During holidays,
eg Christmas, New Year, Easter, etc, the transponder maybe activated for
extended periods. Watch AMSAT-BB for announcements which are usually made on
Friday evenings (UTC)
The nominal transponder frequencies are:
Uplink: 435.150 - 435.130 MHz LSB (Inverting)
Downlink: 145.950 - 145.970 MHz USB
Telemetry Tx: 145.935 MHz BPSK
(The passband may be up to 15kHz higher depending on on-board temps. Low
temperatures give higher freqs!)
FUNcube-2 aka FUNcube on UKube
The FUNcube-2 sub-system continues to operate autonomously and, almost
continuously, in amateur mode. The transponder is operational and the
telemetry downlink is functioning with about 70mW output. The FUNcube-1
Dashboard does not correctly display the telemetry but it does correctly
decode the data and uploads it to the FUNcube Data Warehouse from where it
can be examined. Most of the real time data channels are operational and
these include battery voltages, temperatures and ADCS data coming via the
main On Board Computer (OBC).
The transponder is interrupted for a few seconds every 2 minutes when the
other transmitter sends its CW beacon and, occasionally, for a few seconds
when the main OBC reboots (approx seven times each orbit).
The nominal transponder frequencies are:
Uplink: 435.080 - 435.060 MHz LSB (Inverting)
Downlink: 145.930 - 145.950 MHz USB
Telemetry Tx: 145.915 MHz BPSK
(The passband may be up to 10kHz higher depending on on-board temps. Low
temperatures give higher freqs!)
EO79 FUNcube-3
Due to power budget constraints the transponder cannot be operational 24/7
and an orbit specific schedule has been developed. The transponder will
commence operation 27 minutes after the spacecraft enters sunlight and will
stay on for a period of 25 minutes. This schedule may be modified in future
months as a result of experience.
The nominal transponder frequencies are:
Uplink: 435.0723-435.0473 MHz LSB (Inverting)
Downlink: 145.946-145.971 MHz USB
Further detailed info on EO79 transponder frequencies is at:
https://amsat-uk.org/2016/11/10/eo79-funcube-3-transponder-commences-regular-o
peration/
EO88 Nayif-1 FUNcube-5
EO88 is presently operating in autonomous mode. The transponder is
operational when the satellite is in eclipse, ie the solar panels are NOT
being illuminated.
When the transponder is switched off, the telemetry beacon is on full power,
when the transponder is on the beacon it is on low power.
The transponder frequencies are:
Uplink: 435.045 ? 435.015 MHz LSB (inverting)
Downlink: 145.960-145.990 MHz USB
Telemetry Tx: 145.940MHz
All FUNcube transponders are sponsored by AMSAT-UK and AMSAT-NL. We are very
grateful for the assistance given by Innovative Solution In Space Bv, The
Netherlands.
------------------------------
Message: 11
Date: Fri, 10 Mar 2017 13:35:13 -0600
From: David Swanson <dave@xxxxxxxxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: Re: [amsat-bb] Opinions on improving receive for portable ops
Message-ID:
<CANq+eyXsA36RK96zJu5oUZS8N6xGcQ1m5dkrO5izrgthFTGexw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
OK - Couple different things going on here. I'll take your questions
literally first then go from there:
1) Maybe - A good preamp can help radios like FT8x7 because they don't have
the best noise figure, compared to purpose built VHF/UHF rigs like
821/910/9100. You would probably get some improvement by adding in a
quality preamp (like a ARR or a HSM) without even touching the feedline.
2) No. The AMSAT broadband pre-amp is ok for capturing telemetry, or
amplifying signals over a long coax run, but in a short run it doesn't do
anything to the already weak signals you're receiving from a bird close to
the horizon. If you wanna go the pre-amp route, a high quality purpose
built 70cm is the way to do it.
3) Yes and no.. probably no. The best thing you can do with your yagi is
to adjust the polarity on the fly, and the best way to do that is by
holding it. Get it off the tripod, hold it in your hand, and listen to the
signal. Rotate it until the bird sounds like it's right next to you. I've
seen guys with 4 elements and a good location (more on this in a second)
work FO29 all the way to -1.0? easy copy. If you're not capable of holding
everything up, and are using a tripod, make sure it's the kind that you can
tweak polarity fast with, by rotating on the longitudinal axis. It's not as
good as holding it in your hand, but it'll do. If you're constantly
tweaking your linear polarity, no need to do the CP thing.
Now, reading between the lines on some of the questions:
You didn't ask the question, but since you said portable I have to mention
this. The absolute best tool you have at your disposal once you've freed
yourself from the shackles of a fixed QTH is LOCATION. I'm going to say it
2 more times because it's that important. LOCATION. LOCATION. By choosing
where you setup your station, you can get somewhere at a higher altitude,
clear of obstacles like trees and buildings, and away from artificial RFI.
By doing this not only can you actually get true line of site to the
horizon, where the bird will be for those long distance passes, but you'll
have the best SNR when you do finally hear it. Large parking lots work
pretty good (think Churches or Walmarts) Mountain tops, scenic overlooks,
heck even balconies or rooftops. If you're truly portable go somewhere that
you can see the horizon and is away from the noises a home. When i'm using
my portable setup in my backyard I'm lucky if i can hear most birds below
10?. When I drive 15 miles to the top of a nearby mountain, my portable
setup is good to -1.5? and I break distance records. The only thing that
changed was the location. Whenever you start talking portable, you're
talking location - and location is bar none the most important factor that
you have control over when you're talking about improving reception.
Also, use the absolute best feedline you can afford, that is convenient for
your setup. I use 8' of Times (genuine) LMR240 for my portable setup. I
know some will use the lmr240uf, or rg8x, or even an off-brand of lmr240,
but if you want the absolute best, get the good stuff. LMR400 would be
better yet, but its kinda stiff and heavy, and starts become troublesome to
use while portable, hence why LMR240 seems to be the best middle ground,
for me and the other solid /P ops. I'm sure someone will be in to tell me
how it's only 0.1db less to use 8X or rg58 and other sorts of random
theory, but these people will be wrong. Whatever loss you get by
sacrificing feedline quality will impact your ability to hear at low
elevations.
Finally cheap yagis are nice. I used them solely for 6 months, and still
use them on occasion for guerilla operation... but a commercially built
portable antenna like an arrow is a good investment for any portable
operator. Lining up the gain of 2 separate bands on the same boom is a
difficult task for most garage builders, and you need all the gain you can
get for both tx and rx on those <5? passes. Just something to consider.
Shout if you have any other questions.
73,
Dave, KG5CCI
On Fri, Mar 10, 2017 at 11:24 AM, Scott via AMSAT-BB <amsat-bb@xxxxx.xxx>
wrote:
> I've just started getting on the linear transponders in the last month or
> so after a 30 year absence from sat work, necessarily with a portable
> setup,
> and would be eager to hear experienced opinions on what to do next to
> improve receive.
>
> I'm running Cheap Yagis on V(3 el) and U(6 el), diplexers, about 10 feet of
> RG8X, and receiving on an FT817 or 897, usually on FO29 and the XW's, and
> have up to 25 watts available for the uplink.
>
> Q's are:
>
> 1) with those radios and only about 10 feet of feed line, will a preamp
> help much on 432?
>
> 2) If it will, is the 50$ preamp on the AMSAT site a good start? Or? and
>
> 3) With relatively short yagis, will it make a noticeable difference going
> to circular polarization?
>
> WRT to 3, I've pretty much exhausted what I can find the internet, but just
> don't have a pragmatic sense for what it will do in terms of evening out
> reception over, say, an FO 29 pass - I read that you nominally lose 3 dbs
> most all the time but may pick up a lot on the deep fades, but still not
> sure
> how that translates to the real world.
>
> Or is the answer that the set up is marginal enough I need to do it all of
> the above if I want reliable communications above about 5 degrees or so?
>
> Thanks for the bandwidth and any input.
>
> Scott ka9p
>
>
> _______________________________________________
> 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: Fri, 10 Mar 2017 13:08:19 -0700
From: "Patrick STODDARD (WD9EWK/VA7EWK)" <amsat-bb@xxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: Re: [amsat-bb] Best HT for satellite operation?
Message-ID:
<CAN6TEUcAG5gMu=vOkUsPE=dM6i8yW7sywcEwaLRCkOqZ7BCxKw@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=UTF-8
?Steve,
You could do that, or use a 2m/70cm diplexer as your filter
and only use the 2m side of the diplexer in line with your
SO-50 uplink radio.
I did something similar for an SO-50 demonstration at a
hamfest a couple of years ago, using two Baofeng HTs with
an Elk log periodic. You can see pictures of this setup in
a video I posted:
https://www.youtube.com/watch?v=_cLx9h-vNRA
I used a UV-82 for the uplink, and a UV-5R for the downlink,
connected through a diplexer to my Elk log periodic. I did
not experience desense with this setup, and made a good
number of contacts during this demonstration. I had to use
the diplexer with my Elk, with only one coax feedpoint, but
the diplexer also served as a good bandpass filter for the
radios.
73!
Patrick WD9EWK/VA7EWK
http://www.wd9ewk.net/
Twitter: @xxxxxx
On Fri, Mar 10, 2017 at 11:21 AM, <skristof@xxxxxxx.xxx> wrote:
> I've used two Baofengs to work SO-50, and the V transmission from one
> still desenses the U reception in the other one, even though they are
> two separate radios.
>
> Do I put low-pass filter in the transmission line to squash that third
> harmonic?
>
> Steve AI9IN
>
>
>
------------------------------
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 69
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