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CX2SA > SATDIG 11.01.14 21:02l 276 Lines 6610 Bytes #999 (0) @ WW
BID : AMSATBB912
Read: GUEST
Subj: AMSAT-BB-digest V9 12
Path: IZ3LSV<IK2XDE<DB0RES<DB0ANF<CX2SA
Sent: 140111/2002Z @:CX2SA.SAL.URY.SA #:2492 [Salto] FBB7.00e $:AMSATBB912
From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: Drifty LinearTransponder Oscillators (Paul Stoetzer)
2. Re: antenna help (Nick Pugh K5QXJ)
3. Re: Drifty LinearTransponder Oscillators (Rich/wa4bue)
4. SWR on Satellite antennas (Peter Wilson)
5. Re: SWR on Satellite antennas (i8cvs)
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Message: 1
Date: Sat, 11 Jan 2014 09:31:58 -0500
From: Paul Stoetzer <n8hm@xxxx.xxx>
To: "Rich/wa4bue" <richard.siff@xxxxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: Drifty LinearTransponder Oscillators
Message-ID:
<CABzOSOovOf53sf=Ymm6zpG948e+Zy2poPoOxo7RFLRkvc0QC7Q@xxxx.xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1
According to Wouter, PA3WEG, who designed the AO-73 transponder, PLL
frequency generation is possible now within the power budget of a 1U
CubeSat, but was not when the FUNcube's transponder was designed.
See his post from last month:
http://amsat.org/pipermail/amsat-bb/2013-December/047815.html
73,
Paul, N8HM
On Sat, Jan 11, 2014 at 9:22 AM, Rich/wa4bue <richard.siff@xxxxxxx.xxx> wrote:
> AO7 and FO29 seem to be very stable. VO52 was my first experience with a
> drifty transponder oscillators. I read some explanations on the BB.
>
> What design element needs to be changed to stabilize the linear transponders
> oscillators on the new CUBESATS.
>
> Are the beacons crystal controlled?
>
> Rich
> W4BUE
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
------------------------------
Message: 2
Date: Sat, 11 Jan 2014 10:55:50 -0600
From: "Nick Pugh K5QXJ" <quadpugh@xxxxxxxxx.xxx>
To: "'Robert Bruninga'" <bruninga@xxxx.xxx>, "'AMSAT'"
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: antenna help
Message-ID: <012101cf0eed$fc487a00$f4d96e00$@xxx>
Content-Type: text/plain; charset="us-ascii"
Hi Bob
By comparing the hot sun to cold sky you can figure out the Ratio of antenna
gain to system noise. My system noise is undetermined I suspect that my
antenna are under performing by about 5 db and I would like to compare it to
somebody else antenna. The solar flux numbers are available at both UHF and
VHF
nick
From: Robert Bruninga [mailto:bruninga@xxxx.xxxx
Sent: Saturday, January 11, 2014 8:10 AM
To: Nick Pugh K5QXJ
Subject: Re: [amsat-bb] antenna help
Is it not possible to simply point at the sun and observe the sun noise as a
way to baseline your station performance?
I dont remember if this can work on VHF or UHF, but it works for microwave.
Maybe some experts know the answer...
bob, wb4apr
On Sat, Jan 11, 2014 at 5:12 AM, Nick Pugh K5QXJ <quadpugh@xxxxxxxxx.xxx>
wrote:
I am trying to check out my antennas. I am looking for someone on the list
that has the ability to measure the incoming receive level of signal on a
high gain antenna at UHF/VHF . If you have that ability like a flex 5000 uv
or similar please contact me off list
Thanks
nick
Office 337 593 8700 <tel:337%20593%208700>
Cell 337 258 2527 <tel:337%20258%202527>
Helping UL become a world Class Engineering and Educational School
_______________________________________________
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: Sat, 11 Jan 2014 12:15:38 -0500
From: "Rich/wa4bue" <richard.siff@xxxxxxx.xxx>
To: "Paul Stoetzer" <n8hm@xxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: Drifty LinearTransponder Oscillators
Message-ID: <662DD9AEC3DC49CDB77F970373F86048@xxxxxxxxx>
Content-Type: text/plain; format=flowed; charset=iso-8859-1;
reply-type=original
Yes.
I remember reading that, now.
Are the bacons more stable?
Rich W4BUE
----- Original Message -----
From: "Paul Stoetzer" <n8hm@xxxx.xxx>
To: "Rich/wa4bue" <richard.siff@xxxxxxx.xxx>
Cc: <amsat-bb@xxxxx.xxx>
Sent: Saturday, January 11, 2014 9:31 AM
Subject: Re: [amsat-bb] Drifty LinearTransponder Oscillators
> According to Wouter, PA3WEG, who designed the AO-73 transponder, PLL
> frequency generation is possible now within the power budget of a 1U
> CubeSat, but was not when the FUNcube's transponder was designed.
>
------------------------------
Message: 4
Date: Sat, 11 Jan 2014 18:08:26 -0000
From: "Peter Wilson" <protest@xxxxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] SWR on Satellite antennas
Message-ID: <000001cf0ef8$1fff7f70$5ffe7e50$@xxxxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hi All,
Another question from a newbie.
I noticed the SWR on Tx whilst operating AO-07 mode b was 2:1 on 432.125Mhz.
(A bit high for me...)
However, on VO-52 and AO-73, the SWR is 1:1, which is of course due to the
fact that they are 3Mhz away from Ao-07.
The UK band plan for satellite operation is 435Mhz - 438Mhz and my antenna
is virtually flat throughout that range.
So, I have two questions.
1) Should I be worried about damaging my rig (IC-9100) with the 2:1 SWR on
AO-07?
2) Will future satellites be in the 435 to 438Mhz range?
Thanks
Peter
G8KEK
------------------------------
Message: 5
Date: Sat, 11 Jan 2014 20:35:06 +0100
From: "i8cvs" <domenico.i8cvs@xxx.xx>
To: "Peter Wilson" <protest@xxxxxxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: SWR on Satellite antennas
Message-ID: <006401cf0f04$3bf48480$0401a8c0@xxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Peter Wilson" <protest@xxxxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Saturday, January 11, 2014 7:08 PM
Subject: [amsat-bb] SWR on Satellite antennas
> Hi All,
>
< snip>
>
> So, I have two questions.
>
> 1) Should I be worried about damaging my rig (IC-9100) with the 2:1 SWR
> on AO-07 ?
NO damaging to your rig will occur with a 2:1 SWR
>
> 2) Will future satellites be in the 435 to 438Mhz range?
YES
> Thanks
> Peter
>
> G8KEK
>
73" de i8CVS Domenico
------------------------------
_______________________________________________
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 9, Issue 12
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