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CX2SA > SATDIG 11.01.14 15:30l 841 Lines 24269 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.SAL.URY.SA
To : SATDIG@WW
Today's Topics:
1. Re: DTMF on HF? (Howie DeFelice)
2. SatPC32 - New version (Peter Wilson)
3. AO-73 Doppler shift (Peter Wilson)
4. Re: AO-73 Doppler shift (Andrew Glasbrenner)
5. Re: DTMF on HF? (Jim Wright)
6. Re: DTMF on HF? (Rick Walter)
7. Re: DTMF on HF? (Joe Leikhim)
8. Re: DTMF on HF? (Gus)
9. Re: DTMF on HF? (Joe Leikhim)
10. Re: DTMF on HF? (kc6uqh@xxx.xxxx
11. Fwd: Re: Re: DTMF on HF? (Joe Leikhim)
12. Re: DTMF on HF? (kc6uqh@xxx.xxxx
13. Japanese Amateur Radio Satellites Launch Feb/March (M5AKA)
14. antenna help (Nick Pugh K5QXJ)
15. Re: AO-73 Doppler shift (Jeff Griffin)
16. Drifty LinearTransponder Oscillators (Rich/wa4bue)
----------------------------------------------------------------------
Message: 1
Date: Fri, 10 Jan 2014 15:17:53 -0500
From: Howie DeFelice <howied231@xxxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: DTMF on HF?
Message-ID: <BLU169-W23F080AE178FCD32F7A3B9E7B30@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
Bob,
I don't have any experience using DTMF on HF but back in the day before
satcom, commercial marine HF SSB coast stations used a dual tone selective
calling system made by Lorain Electronics. The encoder used 11 tones, one
each for the digits 0-9 and a carrier tone. Each digit was transmitted along
with the carrier tone and the difference in frequency was detected to decode
the digit. This compensated for small frequency variations. These worked
very well. You could probably do a similar thing with a single row or column
of DTMF if you didn't need more than 4 digits.
Howie AB2S
------------------------------
Message: 2
Date: Fri, 10 Jan 2014 20:52:54 -0000
From: "Peter Wilson" <protest@xxxxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] SatPC32 - New version
Message-ID: <000201cf0e45$ef2586e0$cd7094a0$@xxxxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
All,
Please note there is a new version (12.8c) of SatPC32 available for
download. This version has a number of new features - like attaching the
"Countdown" window to the main window.
Thanks to everyone for helping me over the past few weeks with a number of
topics. I am now fully active on all satellites.
Peter
G8KEK
------------------------------
Message: 3
Date: Fri, 10 Jan 2014 21:26:22 -0000
From: "Peter Wilson" <protest@xxxxxxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] AO-73 Doppler shift
Message-ID: <000701cf0e4a$9be4ddf0$d3ae99d0$@xxxxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Hi all,
I'm having great fun on all the operational satellites, including AO-73.
However, I find that even using CAT control I have to adjust the uplink
frequency almost constantly throughout the pass.
I have to shift buy about 3500Hz overall from start to finish, increasing
all the time.
Is everyone else seeing the same effect?
Peter
G8KEK
------------------------------
Message: 4
Date: Fri, 10 Jan 2014 16:43:03 -0500
From: Andrew Glasbrenner <glasbrenner@xxxxxxxxxx.xxx>
To: Peter Wilson <protest@xxxxxxxxxxx.xxx>
Cc: "<amsat-bb@xxxxx.xxx>" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: AO-73 Doppler shift
Message-ID: <12CB2DE0-5405-4E4C-8B81-D87BA9CF6264@xxxxxxxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Yep, it drifts. Best to tune that one by hand in my opinion. G0MRF addressed
it in an email to the -bb a while ago if I recall correctly.
73, Drew KO4MA
Sent from my iPhone
> On Jan 10, 2014, at 4:26 PM, "Peter Wilson" <protest@xxxxxxxxxxx.xxx> wrote:
>
> Hi all,
>
>
>
> I'm having great fun on all the operational satellites, including AO-73.
>
>
>
> However, I find that even using CAT control I have to adjust the uplink
> frequency almost constantly throughout the pass.
>
> I have to shift buy about 3500Hz overall from start to finish, increasing
> all the time.
>
>
>
> Is everyone else seeing the same effect?
>
>
>
> Peter
>
> G8KEK
>
> _______________________________________________
> 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: 5
Date: Fri, 10 Jan 2014 16:45:17 -0500
From: Jim Wright <wrightjrjr@xxxxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: DTMF on HF?
Message-ID: <52D069ED.5030301@xxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
In days past, the telephone companies ran an analog carrier system of 24
SSB channels with what was called a pilot tone at a reduced level. The
pilot was indeed a carrier reference that was PLL to the office master
clock.
These 0-4 Khz channels could get off on the receiving end, but a
"satellite doppler" type tracking circuit PPL to the incoming pilot tone
kept everything in the pass band of the specific crystal filters for
each channel. Bear in mind we expected pilot error in the CPS range,
rather than 10s or 100s of cycles.
I would think one can design this to work with today's digital
components rather than use the "rock solid" crystal filters this L
Multiplex phone equipment did back in the day.
Connect the pilot tone receive PLL to control the receive RF
oscillator. I suspect it would work if the barn door was not too wide
for the PLL to lock on. May get expensive if you have to use the
crystals from yesteryear.
73
Jim WA4IVM
On 1/10/2014 2:28 PM, Kevin Muenzler, WB5RUE wrote:
> I doubt that it would be useful because the tolerances are extremely high in
> DTMF so if you are only a few Hz off the tones won't lock. FM might be ok
> but certainly not SSB. FM itself has its own problems on HF so that might
> not be useable either.
>
> Kevin Muenzler, WB5RUE
> Grid-EL09uf
> Eagle Creek Observatory
> http://www.eaglecreekobservatory.org
> I'd be unstoppable if it weren't for law enforcement and physics
>
>
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of Robert Bruninga
> Sent: Friday, January 10, 2014 11:10 AM
> To: aprssig@xxxx.xxx
> Cc: amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] DTMF on HF?
>
> Has anyone had any experience with any success at DTMF working on HF for
> some rudimentary commands?
>
>
>
> I know tuning is critical as well as inter-tone noise must be way down.
>
>
>
> Just thought maybe someone has experimented with it.
>
>
>
> Bob, WB4aPR
> _______________________________________________
> 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
>
> _______________________________________________
> Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
> Not an AMSAT-NA member? Join now to support the amateur satellite program!
> Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
>
------------------------------
Message: 6
Date: Fri, 10 Jan 2014 19:37:31 -0500
From: Rick Walter <wb3csy@xxxxx.xxx>
To: Jim Wright <wrightjrjr@xxxxxxx.xxx>
Cc: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: DTMF on HF?
Message-ID: <1957D8FA-0F6A-442E-97B3-2F7F493D8E80@xxxxx.xxx>
Content-Type: text/plain; charset=us-ascii
I sometimes listen to the HF ATC station from New York Center talking to the
planes going to the Caribbean while working on the laptop in the shack. They
transmit selcall to the planes to make sure they can be alerted. The selcall
code is always 4 letters. They send two "tones" I always thought the 4
letters meant two tones together and another two together just like DTMF but
I must be wrong.
Rick WB3CSY
Sent from Rick's iPad2
> On Jan 10, 2014, at 4:45 PM, Jim Wright <wrightjrjr@xxxxxxx.xxx> wrote:
>
> In days past, the telephone companies ran an analog carrier system of 24
SSB channels with what was called a pilot tone at a reduced level. The
pilot was indeed a carrier reference that was PLL to the office master clock.
> These 0-4 Khz channels could get off on the receiving end, but a
"satellite doppler" type tracking circuit PPL to the incoming pilot tone
kept everything in the pass band of the specific crystal filters for each
channel. Bear in mind we expected pilot error in the CPS range, rather than
10s or 100s of cycles.
>
> I would think one can design this to work with today's digital components
rather than use the "rock solid" crystal filters this L Multiplex phone
equipment did back in the day.
> Connect the pilot tone receive PLL to control the receive RF oscillator.
I suspect it would work if the barn door was not too wide for the PLL to
lock on. May get expensive if you have to use the crystals from yesteryear.
>
> 73
> Jim WA4IVM
>
>
>
>
>> On 1/10/2014 2:28 PM, Kevin Muenzler, WB5RUE wrote:
>> I doubt that it would be useful because the tolerances are extremely high
in
>> DTMF so if you are only a few Hz off the tones won't lock. FM might be ok
>> but certainly not SSB. FM itself has its own problems on HF so that might
>> not be useable either.
>>
>> Kevin Muenzler, WB5RUE
>> Grid-EL09uf
>> Eagle Creek Observatory
>> http://www.eaglecreekobservatory.org
>> I'd be unstoppable if it weren't for law enforcement and physics
>>
>>
>> -----Original Message-----
>> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
>> Behalf Of Robert Bruninga
>> Sent: Friday, January 10, 2014 11:10 AM
>> To: aprssig@xxxx.xxx
>> Cc: amsat-bb@xxxxx.xxx
>> Subject: [amsat-bb] DTMF on HF?
>>
>> Has anyone had any experience with any success at DTMF working on HF for
>> some rudimentary commands?
>>
>>
>>
>> I know tuning is critical as well as inter-tone noise must be way down.
>>
>>
>>
>> Just thought maybe someone has experimented with it.
>>
>>
>>
>> Bob, WB4aPR
>> _______________________________________________
>> 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
>>
>> _______________________________________________
>> 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
>
> _______________________________________________
> 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: Fri, 10 Jan 2014 17:31:19 -0500
From: Joe Leikhim <rhyolite@xxxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: DTMF on HF?
Message-ID: <52D074B7.6020704@xxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Since DTMF has two tones for each number, it would seem possible that
you could have some DSP detect the difference frequency of each pair and
then either adjust its decoders or QSY the receiver's VCO to get a lock.
There are a ton of small development boards like Raspberry PI that have
hardware that might be able to do this.
Has anybody got the AMSAT-bb daily digest to work through their e-mail
provider other than Gmail?
--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
JLeikhim@xxxxxxx.xxx
407-982-0446
WWW.LEIKHIM.COM
------------------------------
Message: 8
Date: Fri, 10 Jan 2014 23:19:39 -0400
From: Gus <gus@xxxxx.xxx>
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: DTMF on HF?
Message-ID: <52D0B84B.7070406@xxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Unfortunately, in some cases the differences are very close. "C" and
"3" have pairs with a differential only 1 Hz apart.
Perhaps some heuristic approach which examines several consecutive
tone-pairs, looking for a single offset that would make them all valid?
On 01/10/2014 06:31 PM, Joe Leikhim wrote:
> Since DTMF has two tones for each number, it would seem possible that
> you could have some DSP detect the difference frequency of each pair and
> then either adjust its decoders or QSY the receiver's VCO to get a lock.
> There are a ton of small development boards like Raspberry PI that have
> hardware that might be able to do this.
>
> Has anybody got the AMSAT-bb daily digest to work through their e-mail
> provider other than Gmail?
>
--
Gus 8P6SM
The Easternmost Isle
------------------------------
Message: 9
Date: Fri, 10 Jan 2014 23:32:14 -0500
From: Joe Leikhim <rhyolite@xxxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: DTMF on HF?
Message-ID: <52D0C94E.1080206@xxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
The software could first solve for one pair of tones then another, then
add or subtract the offset and choose the pair that has the correct
fundamental tones.
--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
JLeikhim@xxxxxxx.xxx
407-982-0446
WWW.LEIKHIM.COM
------------------------------
Message: 10
Date: Fri, 10 Jan 2014 21:05:01 -0800
From: <kc6uqh@xxx.xxx>
To: "'Joe Leikhim'" <rhyolite@xxxxxxx.xxx>, "'amsat-bb@xxxxx.xxxxx
<amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: DTMF on HF?
Message-ID: <002701cf0e8a$af458bc0$0dd0a340$@xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Joe,
A -16dB pilot carrier would solve the frequency offset problem. This was a
common solution for Marine shore stations in the last century.
Art,
KC6UQH
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Joe Leikhim
Sent: Friday, January 10, 2014 2:31 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: DTMF on HF?
Since DTMF has two tones for each number, it would seem possible that you
could have some DSP detect the difference frequency of each pair and then
either adjust its decoders or QSY the receiver's VCO to get a lock.
There are a ton of small development boards like Raspberry PI that have
hardware that might be able to do this.
Has anybody got the AMSAT-bb daily digest to work through their e-mail
provider other than Gmail?
--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
JLeikhim@xxxxxxx.xxx
407-982-0446
WWW.LEIKHIM.COM
_______________________________________________
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: 11
Date: Sat, 11 Jan 2014 00:20:48 -0500
From: Joe Leikhim <rhyolite@xxxxxxx.xxx>
To: "amsat-bb@xxxxx.xxxx <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Fwd: Re: Re: DTMF on HF?
Message-ID: <52D0D4B0.1010001@xxxxxxx.xxx>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
True,
But fixing on the receive end would be more spectrum efficient. And you
need to autotune the suppressed carrier anyway requiring receiver side
complexity, so why not give DSP a challenge to do it in the blind?
With DSP so readily available, I am surprised doppler correction of
voice has not been explored.
On 1/11/2014 12:05 AM, kc6uqh@xxx.xxx wrote:
> Joe,
> A -16dB pilot carrier would solve the frequency offset problem. This was a
> common solution for Marine shore stations in the last century.
> Art,
> KC6UQH
>
> -----Original Message-----
> From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
> Behalf Of Joe Leikhim
> Sent: Friday, January 10, 2014 2:31 PM
> To: amsat-bb@xxxxx.xxx
> Subject: [amsat-bb] Re: DTMF on HF?
>
> Since DTMF has two tones for each number, it would seem possible that you
> could have some DSP detect the difference frequency of each pair and then
> either adjust its decoders or QSY the receiver's VCO to get a lock.
> There are a ton of small development boards like Raspberry PI that have
> hardware that might be able to do this.
>
> Has anybody got the AMSAT-bb daily digest to work through their e-mail
> provider other than Gmail?
>
> --
> Joe Leikhim
>
>
> Leikhim and Associates
>
> Communications Consultants
>
> Oviedo, Florida
>
> JLeikhim@xxxxxxx.xxx
>
> 407-982-0446
>
> WWW.LEIKHIM.COM
>
> _______________________________________________
> 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
>
--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
JLeikhim@xxxxxxx.xxx
407-982-0446
WWW.LEIKHIM.COM
------------------------------
Message: 12
Date: Fri, 10 Jan 2014 21:24:00 -0800
From: <kc6uqh@xxx.xxx>
To: "'Howie DeFelice'" <howied231@xxxxxxx.xxx>, <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: DTMF on HF?
Message-ID: <002e01cf0e8d$55e21050$01a630f0$@xxx.xxx>
Content-Type: text/plain; charset="us-ascii"
Howie,
The original Marine selective call used two tones which toggled controlling
a mechanical escapement. At
the end of each 0-9 digit the hold tone was kept on & a pawl would hold the
escapement wheel if a pin was placed for that number in the wheel. The next
digit would then be dialed. If it was the correct number the escapement
would move around to a fixed contact that would sound a bell. If it was the
wrong digit the wheel would return to the start position. This system was
used on Marine and land mobile phone systems until the SS revolution in the
70's
Art,
KC6UQH
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Howie DeFelice
Sent: Friday, January 10, 2014 12:18 PM
To: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: DTMF on HF?
Bob,
I don't have any experience using DTMF on HF but back in the day before
satcom, commercial marine HF SSB coast stations used a dual tone selective
calling system made by Lorain Electronics. The encoder used 11 tones, one
each for the digits 0-9 and a carrier tone. Each digit was transmitted along
with the carrier tone and the difference in frequency was detected to decode
the digit. This compensated for small frequency variations. These worked
very well. You could probably do a similar thing with a single row or column
of DTMF if you didn't need more than 4 digits.
Howie AB2S
_______________________________________________
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: 13
Date: Sat, 11 Jan 2014 09:53:52 +0000 (GMT)
From: M5AKA <m5aka@xxxxx.xx.xx>
To: AMSAT BB <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Japanese Amateur Radio Satellites Launch Feb/March
Message-ID:
<1389434032.29348.YahooMailNeo@xxxxxxxxx.xxxx.xxx.xxxxx.xxx>
Content-Type: text/plain; charset=utf-8
Japanese Amateur Radio Satellites Launch Feb/March
http://amsat-uk.org/2014/01/10/japanese-amateur-radio-satellites-launch-febmar
ch/
Space Station orbit live on Channel 4 HD TV
http://amsat-uk.org/2014/01/11/space-station-orbit-live-on-channel-4-tv-2/
Ham radio CubeSats launched to ISS
http://amsat-uk.org/2014/01/09/ham-radio-cubesats-launched-to-iss/
----
73 Trevor M5AKA
AMSAT-UK website http://amsat-uk.org/
Facebook https://www.facebook.com/pages/AMSAT-UK/208113275898396
Twitter https://twitter.com/AMSAT_UK
----
------------------------------
Message: 14
Date: Sat, 11 Jan 2014 04:12:06 -0600
From: "Nick Pugh K5QXJ" <quadpugh@xxxxxxxxx.xxx>
To: "'AMSAT'" <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] antenna help
Message-ID: <00e701cf0eb5$95d4bb90$c17e32b0$@xxx>
Content-Type: text/plain; charset="us-ascii"
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
Cell 337 258 2527
Helping UL become a world Class Engineering and Educational School
------------------------------
Message: 15
Date: Sat, 11 Jan 2014 08:43:06 -0500
From: "Jeff Griffin" <kb2m@xxxxxxx.xxx>
To: "'Andrew Glasbrenner'" <glasbrenner@xxxxxxxxxx.xxx>, "'Peter
Wilson'" <protest@xxxxxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: AO-73 Doppler shift
Message-ID: <037e01cf0ed3$0ee5c020$2cb14060$@xxx>
Content-Type: text/plain; charset="us-ascii"
This is the way it has always been with this bird, I posted this about a
month ago....
From: Jeff Griffin [mailto:kb2m@xxxxxxx.xxxx
Sent: Monday, December 9, 2013 9:38 AM
To: 'amsat-bb@xxxxx.xxxx
Subject: RE: [amsat-bb] Re: Auburn sat
I also worked AO-73 for the first time this weekend (thanks all involved
for the new sat) and noticed the frequency shift also. As the bird came up I
found my D/L at about 5k higher than the advertised center frequency. What
was different was that by the end of the pass, the D/L ended up about 10k
higher than the Doppler adjustment supplied by PCSat32. It was like, as the
transponder was being used and warmed up it went higher in frequency. I
found that during several QSO's I made, I had to adjust the D/L up several
times. As I had just worked VO-52 this was noticeably different. I'm not
complaining, I just thought this worth mentioning :-)
73 Jeff kb2m
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Andrew Glasbrenner
Sent: Friday, January 10, 2014 4:43 PM
To: Peter Wilson
Cc: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Re: AO-73 Doppler shift
Yep, it drifts. Best to tune that one by hand in my opinion. G0MRF addressed
it in an email to the -bb a while ago if I recall correctly.
73, Drew KO4MA
Sent from my iPhone
> On Jan 10, 2014, at 4:26 PM, "Peter Wilson" <protest@xxxxxxxxxxx.xxx>
wrote:
>
> Hi all,
>
>
>
> I'm having great fun on all the operational satellites, including AO-73.
>
>
>
> However, I find that even using CAT control I have to adjust the
> uplink frequency almost constantly throughout the pass.
>
> I have to shift buy about 3500Hz overall from start to finish,
> increasing all the time.
>
>
>
> Is everyone else seeing the same effect?
>
>
>
> Peter
>
> G8KEK
>
> _______________________________________________
> 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
_______________________________________________
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: 16
Date: Sat, 11 Jan 2014 09:22:58 -0500
From: "Rich/wa4bue" <richard.siff@xxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Subject: [amsat-bb] Drifty LinearTransponder Oscillators
Message-ID: <15C50EF58DB44FE6B7A81C4DDF11AE80@xxxxxxxxx>
Content-Type: text/plain; format=flowed; charset=iso-8859-1;
reply-type=original
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
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End of AMSAT-BB Digest, Vol 9, Issue 11
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