| |
CX2SA > SATDIG 08.05.20 18:00l 715 Lines 24983 Bytes #999 (0) @ WW
BID : AMSATBB15146
Read: GUEST
Subj: AMSAT-BB-digest V15 146
Path: IW8PGT<IZ3LSV<IR1UAW<I0OJJ<N6RME<CX2SA
Sent: 200508/1553Z @:CX2SA.SAL.URY.SOAM #:30871 [Salto] FBB7.00e $:AMSATBB15146
From: CX2SA@CX2SA.SAL.URY.SOAM
To : SATDIG@WW
Today's Topics:
1. Re: SatPC32 and the Green Herron Rotor Controller
(Dave Webb KB1PVH)
2. Re: Just an observation (Stephen DeVience)
3. Re: SatPC32 and the Green Herron Rotor Controller (Stefan Wagener)
4. Re: Drones For Sale (Mike)
5. Re: Fw: 2M desense on Icom IC-9700 (Charles Reiche)
6. Re: Fw: 2M desense on Icom IC-9700 (Michael Walker)
7. Re: Just an observation (jim@?????.????
8. Re: Just an observation (Zach Metzinger)
9. Re: Just an observation (Steve Kristoff)
10. Re: Just an observation (Stephen DeVience)
11. FITSAT-1 5 GHz transmitter? (Michelle Thompson)
12. FM vs Linear Transponders (Ray Soifer)
----------------------------------------------------------------------
Message: 1
Date: Thu, 7 May 2020 13:37:16 -0400
From: Dave Webb KB1PVH <kb1pvh@?????.???>
To: Peter <pgprendergast@?????.???>
Cc: AMSAT -BB <amsat-bb@?????.???>
Subject: Re: [amsat-bb] SatPC32 and the Green Herron Rotor Controller
Message-ID:
<CAEMY9FcLTMyp2PM2BkmZdHJ1B=6Gp8HN0r1ot8=K7gAtZdvR4A@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Hit send too soon. After you select the rotors then you need to go to
Communication > AZ Com port and select the com port for AZ then do EL/AZ+EL
Com port and select the com port for the EL
Dave-KB1PVH
Sent from my Galaxy S9
On Thu, May 7, 2020, 1:34 PM Dave Webb KB1PVH <kb1pvh@?????.???> wrote:
> Setup > AZ Controller > RT-21 Green Heron then Setup > EL/AZ+EL Controller
> > RT-21 Green Heron
>
> Dave-KB1PVH
>
>
> Sent from my Galaxy S9
>
> On Thu, May 7, 2020, 1:22 PM Peter <pgprendergast@?????.???> wrote:
>
>> I'm not seeing the Green Herron dual alt az RT21 as a choice or even how
>> to set its serial lports??
>> Peter
>>
>> On Thursday, May 7, 2020, 12:57:50 PM EDT, Dave Webb KB1PVH <
>> kb1pvh@?????.???> wrote:
>>
>>
>> Peter,
>>
>> You can set DDE output in SatPC32 and also use a DDE client like the one
>> from Green Heron called GH Tracker or what I do is run PSTrotator which
>> supports the Green Heron for rotor control and run SatPC32 for radio
>> control. Just be aware if you use DDE output you will lose the ability to
>> park antennas after a pass and also the ability to have antennas start
>> before a pass.
>>
>> Dave-KB1PVH
>>
>>
>> Sent from my Galaxy S9
>>
>> On Thu, May 7, 2020, 12:52 PM Peter via AMSAT-BB <amsat-bb@?????.???>
>> wrote:
>>
>> So, I do not see as a choice the Green Herron RT21 Alt Az
>> rotorcontroller?????
>> How can I get the program to control the antennas???ThanksPeterW2PP
>>
>> _______________________________________________
>> Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
>>
>>
------------------------------
Message: 2
Date: Thu, 7 May 2020 13:58:58 -0400
From: Stephen DeVience <sjdevience@?????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] Just an observation
Message-ID:
<CAMPfQQBDpAC-o3RSA8VLC6SY06NLnCDN9gKof1L9NjqgDc6nqA@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
*I don't
really understand since getting active on sats again - which is why the
same guys keep working each other on every FM satellite pass.*
This is especially puzzling when there are rare DX and special event
stations on. I was on a pass last night where there were both, yet the
everyday folks were stepping on them and calling one another instead.
73,
Stephen, N8URE
------------------------------
Message: 3
Date: Thu, 7 May 2020 13:00:11 -0500
From: Stefan Wagener <wageners@?????.???>
To: Peter <pgprendergast@?????.???>
Cc: AMSAT -BB <amsat-bb@?????.???>
Subject: Re: [amsat-bb] SatPC32 and the Green Herron Rotor Controller
Message-ID:
<CAKu8kHAg6_ZezVhZR4O5Sb_eGbExXy_0-2n56D_-N5DTOne-yw@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Access the manual in SatPC32. click on "?" in the menu bar and open the
manual.....
On Thu, May 7, 2020 at 12:42 PM Peter via AMSAT-BB <amsat-bb@?????.???>
wrote:
> Got it. Thanks for that.So, how do you load in the satellites you want it
> to track and provide next pass time/date?I see I managed somehow to get one
> satellite into that window but I don't know how I did it?Is their a decent
> manual someplace?Peter
>
> On Thursday, May 7, 2020, 01:34:43 PM EDT, Dave Webb KB1PVH <
> kb1pvh@?????.???> wrote:
>
> Setup > AZ Controller > RT-21 Green Heron then Setup > EL/AZ+EL
> Controller > RT-21 Green Heron
>
> Dave-KB1PVH
>
>
> Sent from my Galaxy S9
> On Thu, May 7, 2020, 1:22 PM Peter <pgprendergast@?????.???> wrote:
>
> I'm not seeing the Green Herron dual alt az RT21 as a choice or even how
> to set its serial lports??Peter
> On Thursday, May 7, 2020, 12:57:50 PM EDT, Dave Webb KB1PVH <
> kb1pvh@?????.???> wrote:
>
> Peter,
> You can set DDE output in SatPC32 and also use a DDE client like the one
> from Green Heron called GH Tracker or what I do is run PSTrotator which
> supports the Green Heron for rotor control and run SatPC32 for radio
> control. Just be aware if you use DDE output you will lose the ability to
> park antennas after a pass and also the ability to have antennas start
> before a pass.
>
> Dave-KB1PVH
>
>
> Sent from my Galaxy S9
> On Thu, May 7, 2020, 12:52 PM Peter via AMSAT-BB <amsat-bb@?????.???>
> wrote:
>
> So, I do not see as a choice the Green Herron RT21 Alt Az
> rotorcontroller?????
> How can I get the program to control the antennas???ThanksPeterW2PP
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
>
>
>
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 4
Date: Thu, 7 May 2020 14:07:05 -0400
From: Mike <wb8cxo@?????.???>
To: Zach Metzinger <zmetzing@?????.???>
Cc: amsat-bb@?????.???
Subject: Re: [amsat-bb] Drones For Sale
Message-ID: <7BC2C138-554A-4796-9F82-CD1AC4368E9C@?????.???>
Content-Type: text/plain; charset=utf-8
Drones are a great tool for inspecting antenna installations. That is
related to our hobby!
> On May 7, 2020, at 11:41 AM, Zach Metzinger via AMSAT-BB
<amsat-bb@?????.???> wrote:
>
> ?On 05/07/20 10:27, Coy Johnson via AMSAT-BB wrote:
>> I have for sale the following items for sale:
>
> Hello Coy,
>
> This is not the appropriate venue for these items. Please use eBay or
similar.
>
> Thanks,
>
> --- Zach
> N0ZGO
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 5
Date: Thu, 7 May 2020 14:10:45 -0400
From: Charles Reiche <charlieray@?????.???>
To: KI7UNJ Tucker <ki7unj@?????.???>
Cc: AMSAT BB <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Fw: 2M desense on Icom IC-9700
Message-ID:
<CAMkCmDpcRpT9Vpy_vE-zi3mpLkQVQ3Cu_DvvEdS6Dh6HOs-PQw@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
I also have not had desense issues on my 9700 compared to my 910. I
actually removed my mode J filter.
No problems here.
N3CRT
Charles Reiche
On Thu, May 7, 2020 at 11:34 AM KI7UNJ Tucker via AMSAT-BB <
amsat-bb@?????.???> wrote:
> I have to say I'm not getting desense with my IC-9700, unless I'm using
> more power than is needed or should be using on the SSB Sats.
>
> Maybe try to lower your power? RS-44 can easily be worked at around 2% (2w)
> power and I work SO-50 at 0-3% every time (500mw-3w)
>
> On Wed, May 6, 2020 at 6:52 PM Kevin via AMSAT-BB <amsat-bb@?????.???>
> wrote:
>
> > Jerry,
> > Comparing the 9700 to my 9100 I also noticed that it was much more
> > prone to desense, it was not as bad here as what you are seeing but it
> > was there, same antennas here BTW.
> > The desense with the lack of 9600 packet support made it easy for me to
> > go back to my 9100 and sell the 9700. Had I kept it my next plan was to
> > put a diplexer in line on the 70cm side with a 50 ohm load on the 2m
> > port, this would probably be your best option and putting it before an
> > external preamp would also be best if you are using one.
> >
> > 73
> > Kevin WA7FWF
> >
> > On 5/6/2020 6:18 PM, BeetleJerald Oliver via AMSAT-BB wrote:
> > >
> > >
> > > ----- Forwarded Message ----- From: BeetleJerald Oliver <
> > revjwo@???.???>To: amsat-bb@?????.??? <amsat-bb@?????.???>Sent:
> > Wednesday, May 6, 2020, 02:55:41 PM CDTSubject: 2M desense on Icom
> IC-9700
> > > I just replaced my Yaesu FT-847 with the Icom IC-9700. I am having
> > problem with 2M uplink overloading (desense) the 70CM downlink, resulting
> > in not being able to use RS-44, FO-29, or SO-50. It is the same antenna
> > system that I used with the FT-847 and I experienced no problem at all
> with
> > the FT-847. SWR on both VHF/UHF is quite low using M2 CP yagis on
> > fiberglas boom, 11 feet apart. I have the problem whether I use the
> > preamps, or not. Even at 5W out, it is quite noticeable. Anyone else had
> > this problem?
> > > KJ4EU Jerry
> > > _______________________________________________
> > > Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
> >
> > _______________________________________________
> > Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
> >
>
>
> --
> *Casey Tucker KI7UNJ*
> https://twitter.com/KI7UNJ
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 6
Date: Thu, 7 May 2020 14:26:05 -0400
From: Michael Walker <va3mw@??????????.???>
To: Charles Reiche <charlieray@?????.???>
Cc: AMSAT BB <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Fw: 2M desense on Icom IC-9700
Message-ID:
<CA+33ts6eqq0Hh2a_rYsVmWM6n3HiD-__5PVZDSYY67u=TMqyXw@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
I have to agree, I got zero desense.
I am using a VHF 4 Element Quad beside a 7 Element UHF quad on a 6ft boom
fiberglass boom. This is with running full power on either band.
Mike va3mw
On Thu, May 7, 2020 at 2:17 PM Charles Reiche via AMSAT-BB <
amsat-bb@?????.???> wrote:
> I also have not had desense issues on my 9700 compared to my 910. I
> actually removed my mode J filter.
>
> No problems here.
> N3CRT
> Charles Reiche
>
>
> On Thu, May 7, 2020 at 11:34 AM KI7UNJ Tucker via AMSAT-BB <
> amsat-bb@?????.???> wrote:
>
> > I have to say I'm not getting desense with my IC-9700, unless I'm using
> > more power than is needed or should be using on the SSB Sats.
> >
> > Maybe try to lower your power? RS-44 can easily be worked at around 2%
> (2w)
> > power and I work SO-50 at 0-3% every time (500mw-3w)
> >
> > On Wed, May 6, 2020 at 6:52 PM Kevin via AMSAT-BB <amsat-bb@?????.???>
> > wrote:
> >
> > > Jerry,
> > > Comparing the 9700 to my 9100 I also noticed that it was much more
> > > prone to desense, it was not as bad here as what you are seeing but it
> > > was there, same antennas here BTW.
> > > The desense with the lack of 9600 packet support made it easy for me to
> > > go back to my 9100 and sell the 9700. Had I kept it my next plan was to
> > > put a diplexer in line on the 70cm side with a 50 ohm load on the 2m
> > > port, this would probably be your best option and putting it before an
> > > external preamp would also be best if you are using one.
> > >
> > > 73
> > > Kevin WA7FWF
> > >
> > > On 5/6/2020 6:18 PM, BeetleJerald Oliver via AMSAT-BB wrote:
> > > >
> > > >
> > > > ----- Forwarded Message ----- From: BeetleJerald Oliver <
> > > revjwo@???.???>To: amsat-bb@?????.??? <amsat-bb@?????.???>Sent:
> > > Wednesday, May 6, 2020, 02:55:41 PM CDTSubject: 2M desense on Icom
> > IC-9700
> > > > I just replaced my Yaesu FT-847 with the Icom IC-9700. I am having
> > > problem with 2M uplink overloading (desense) the 70CM downlink,
> resulting
> > > in not being able to use RS-44, FO-29, or SO-50. It is the same
> antenna
> > > system that I used with the FT-847 and I experienced no problem at all
> > with
> > > the FT-847. SWR on both VHF/UHF is quite low using M2 CP yagis on
> > > fiberglas boom, 11 feet apart. I have the problem whether I use the
> > > preamps, or not. Even at 5W out, it is quite noticeable. Anyone else
> had
> > > this problem?
> > > > KJ4EU Jerry
> > > > _______________________________________________
> > > > Sent via AMSAT-BB@?????.???. 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:
> https://www.amsat.org/mailman/listinfo/amsat-bb
> > >
> > > _______________________________________________
> > > Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
> > >
> >
> >
> > --
> > *Casey Tucker KI7UNJ*
> > https://twitter.com/KI7UNJ
> > _______________________________________________
> > Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
> >
> _______________________________________________
> Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 7
Date: Thu, 7 May 2020 11:27:51 -0700 (PDT)
From: "jim@?????.???? <jim@?????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] Just an observation
Message-ID: <1588876071.371627426@????.?????????.???>
Content-Type: text/plain;charset=UTF-8
Remember, just because you are interested in grid square chasing or DXing,
not everybody is. There are people who could not care less about a rare
grid square, state, or DX station. What they want to do is say Hi to their
friends. Same thing with contests. To people who are not involved in
whatever contest is happening are often annoyed at all the contest operators
taking over the entire band for their contest.
Of course this discussion applies to far more than just FM satellite
operation.
Jim - K6CCC
-----Original Message-----
From: "Stephen DeVience via AMSAT-BB" <amsat-bb@?????.???>
Sent: Thursday, May 7, 2020 10:58
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] Just an observation
*I don't
really understand since getting active on sats again - which is why the
same guys keep working each other on every FM satellite pass.*
This is especially puzzling when there are rare DX and special event
stations on. I was on a pass last night where there were both, yet the
everyday folks were stepping on them and calling one another instead.
73,
Stephen, N8URE
_______________________________________________
Sent via AMSAT-BB@?????.???. 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: https://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 8
Date: Thu, 7 May 2020 13:40:42 -0500
From: Zach Metzinger <zmetzing@?????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] Just an observation
Message-ID: <2521fb4d-4f28-63f5-7e37-ee4252afbaff@?????.???>
Content-Type: text/plain; charset=utf-8; format=flowed
On 05/07/20 13:27, jim--- via AMSAT-BB wrote:
> Remember, just because you are interested in grid square chasing or
> DXing, not everybody is. There are people who could not care less
> about a rare grid square, state, or DX station. What they want to do
> is say Hi to their friends. <snip> Of course this discussion applies
> to far more than just FM satellite operation.
All,
I completely agree with Jim, and I'll go further:
Please, support AMSAT's mission to put bigger payloads, more bands, and
more linear "bent-pipe" capability in orbit! Donate time, money, or
talent to the cause. Not every project needs to be working on the space
platform -- there's plenty of educational and advanced user terminal
(SDR, dedicated hardware, etc.) development needed right here on Earth
to fully utilize the amateur radio satellites.
We need to increase our utilization of every band open to us for Amateur
Satellite service, so we don't lose them (such as the likely fate of 3.5
GHz, which includes a satellite allocation).
More orbiting bandwidth means more people participating in any way they
want to, be it grid-chasing, DX, or simply chatting casually with an old
or new friend.
--- Zach
N0ZGO
------------------------------
Message: 9
Date: Thu, 07 May 2020 14:42:30 -0400
From: "Steve Kristoff" <skristof@???????.???>
To: Amsat <amsat-bb@?????.???>
Subject: Re: [amsat-bb] Just an observation
Message-ID: <8f46bc90322a5d71d2d74e6274ebe11f@???????.???>
Content-Type: text/plain; charset=UTF-8
I would like to suggest that perhaps a posting here on this forum or some
other type of social media might be a better way to point out problems
rather than using satellite time.
Steve AI9IN
?
----- Original Message -----
From: Dave Pascoe via AMSAT-BB (amsat-bb@?????.????
Date: 05/07/20 13:32
To: Amsat (amsat-bb@?????.????
Subject: Re: [amsat-bb] Just an observation
I was on that pass and heard the intentional QRM. While the intentional QRM
is despicable, I think his intention was to point out something I don't
really understand since getting active on sats again - which is why the
same guys keep working each other on every FM satellite pass. There is
limited bandwidth and potentially a lot of new users who don't get a chance
to make contacts. I can understand working your buddies on the linear sats,
but why can't folks be considerate and generally only work new stations or
grids?
73,
Dave KM3T
On Thu, May 7, 2020 at 12:38 PM Steve Kristoff via AMSAT-BB <
amsat-bb@?????.???> wrote:
>
> ?FWIW- If you are going to admonish someone for ?poor behavior on an FM
> satellite, it is probably not the best idea to do it during the pass. Done
> that way, the admonishment becomes as bad as the original QRM.
> Steve AI9IN
>
>?
------------------------------
Message: 10
Date: Thu, 7 May 2020 15:29:13 -0400
From: Stephen DeVience <sjdevience@?????.???>
To: amsat-bb@?????.???
Subject: Re: [amsat-bb] Just an observation
Message-ID:
<CAMPfQQBTRnobH1oaFe+ATn2Jkp7FCvMbFDX66-SMncAGNa2WVA@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
"More orbiting bandwidth means more people participating in any way they
want to, be it grid-chasing, DX, or simply chatting casually with an old
or new friend."
Absolutely, and it's a testament to the interest in this part of the
hobby that we are fighting over bandwidth, rather than complaining
that there's no one answering our CQ. It's a good sign!
Also, there is a lot of bandwidth on the APRS satellites (Falconsat-3,
ARISS, NO-84) and the PSK birds (NO-84, NO-104) waiting for more
users. Remember, with APRS you can do more than just send your
position, you can send messages back and forth and have a decent
conversation. So for those tired of the QRM on FM, consider giving
them a try.
Stephen, N8URE
------------------------------
Message: 11
Date: Thu, 7 May 2020 19:23:19 -0700
From: Michelle Thompson <mountain.michelle@?????.???>
To: AMSAT BB <amsat-bb@?????.???>
Subject: [amsat-bb] FITSAT-1 5 GHz transmitter?
Message-ID:
<CACvjz2VDTN+b+dqgLh8wKq8w_kSV8RXsBkELaOd=RRGaYxEDUg@????.?????.???>
Content-Type: text/plain; charset="UTF-8"
Greetings all!
I have a few questions about the 5 GHz transmitter from FITSAT-1, based on
the block diagram.
Anyone here involved with that particular design?
If you're interested - It's an excessively lengthy link to a PDF paper
about the mission, but if you put "Development and operations of
nano-satellite FITSAT-1 (NIWAKA)" into Google Scholar, then it shows up and
is accessible.
-Michelle W5NYV
------------------------------
Message: 12
Date: Fri, 8 May 2020 15:40:15 +0000 (UTC)
From: Ray Soifer <rsoifer1@???.???>
To: amsat-bb@?????.???
Subject: [amsat-bb] FM vs Linear Transponders
Message-ID: <656322624.206523.1588952415716@????.?????.???>
Content-Type: text/plain; charset=UTF-8
Being neither a grid-chaser nor a ragchewer, I hesitate to get involved in
this debate, but my flak jacket is on so here goes.
There is a fundamental difference between FM satellites and linear
transponders: every LEO FM satellite that has been put up so far has only
one channel, while linear transponders can accommodate several QSOs at the
same time.? Thus, for those of us operating from densely populated areas,
using an FM satellite to talk with friends seems a misuse of available
resources.? It also creates an incentive to run excessive power in order to
keep others from taking over the channel.? A linear transponder is much
better suited to that type of operation.? Rapid-fire grid-chasing,
state-chasing or DX chasing, on the other hand, can easily make 3 or 4 QSOs
per minute, a more efficient use of a single-channel transponder.
That's my input.? Now I'll go back to CW.
73 Ray W2RS
------------------------------
Subject: Digest Footer
_______________________________________________
Sent via amsat-bb@?????.???.
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!
https://www.amsat.org/mailman/listinfo/amsat-bb
------------------------------
End of AMSAT-BB Digest, Vol 15, Issue 146
*****************************************
Read previous mail | Read next mail
| |
