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cal-amp dc



Thanks to all who sent me information on converting the dc. George,W3VVP
----- Original Message -----
From: "AMSAT-BB-digest" <owner-AMSAT-BB-digest@AMSAT.Org>
To: <amsat-bb-digest@AMSAT.Org>
Sent: Wednesday, July 04, 2001 3:00 AM
Subject: AMSAT-BB-digest V2001 #433


>
> AMSAT-BB-digest       Wednesday, July 4 2001       Volume 2001 :
Number 433
>
>
>
> In this issue:
>
>     Re: [amsat-bb] PSK tone interesting on AO-40
>     RE: [amsat-bb] PSK tone interesting on AO-40
>     Re: [amsat-bb] PSK tone interesting on AO-40
>     Re: [amsat-bb] cal-amp dc
>     [amsat-bb] Ranging question (was PSK tone interesting on AO-40)
>     [amsat-bb] Drake Converter
>     [amsat-bb] On the Road Again Arkansas EM35 EM43 EM44
>     RE: [amsat-bb] Ranging question (was PSK tone interesting on
AO-40)
>     [amsat-bb] Radio Lens
>     Re: [amsat-bb] KO-25 Signs of life
>     Re: [amsat-bb] Ranging question (was PSK tone interesting on
AO-40)
>     R: [amsat-bb] G4COM Noise Meter and system tweaking...
>     R: [amsat-bb] PSK tone interesting on AO-40
>     Re: [amsat-bb] Radio Lens
>     Re: [amsat-bb] freedom from the British.
>     [amsat-bb] ALON/ALAT
>
> ----------------------------------------------------------------------
>
> Date: Tue, 3 Jul 2001 19:58:41 -0400
> From: "greg" <greg@valkyrie.net>
> Subject: Re: [amsat-bb] PSK tone interesting on AO-40
>
> i was having the same thing !
>
>
> N8TDL
>
> > Hi folks,
> >
> > I noticed something strange a couple of nights ago too, but it
> > wasn't a frequency shift.  The waterfall on AO40RCV changed
> > suddenly from being a pair of combs to a pair of fuzzy bands.
> > It stayed there for a minute or so, during which telemetry stopped.
> > Then it suddenly changed back, and telemetry resumed.
> >
> > If it happens again, I'll check the telemetry for the magnets
> > being on.  Could there be another problem (like, on my end)?
> >
> > 73s,
> >
> > Greg  KO6TH
> >
> >
> > >From: Peter Guelzow <peter.guelzow@arcormail.de>
> > >To: Howard Long <howard@howardlong.com>
> > >CC: amsat-bb@AMSAT.Org
> > >Subject: Re: [amsat-bb] PSK tone interesting on AO-40
> > >Date: Tue, 03 Jul 2001 20:48:24 +0000
> > >
> > >Hi Howard,
> > >
> > >Howard Long wrote:
> > > >
> > > > Sitting here in the shack listening to AO-40 (and watching the
> > >telemetry)
> > > > tonight, the PSK tone seems to lower by a few tens of hertz for
a
> couple
> > >of
> > > > seconds and then rise back again.
> > > >
> > > > I've never heard this before, but I'm sure someone will be able
to
> > >explain.
> > > > Can't see anything obvious from the telemetry myself.
> > >
> > >This is due to the magnetorquing around perigee...
> > >
> > >73s Peter DB2OS
> > >
> > >
> > >----
> > >Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > >To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> >
> > _________________________________________________________________
> > Get your FREE download of MSN Explorer at http://explorer.msn.com
> >
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> >
>
> - ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ------------------------------
>
> Date: Tue, 3 Jul 2001 20:37:24 -0400
> From: "Alan K. Adamson" <ne1h@highrf.com>
> Subject: RE: [amsat-bb] PSK tone interesting on AO-40
>
> When they do ranging, that's exactly what it looks like on ao40rcv. :)
>
> Alan
>
> - -----Original Message-----
> From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
> Behalf Of greg
> Sent: Tuesday, July 03, 2001 7:59 PM
> To: Greg D.; amsat-bb@AMSAT.Org
> Subject: Re: [amsat-bb] PSK tone interesting on AO-40
>
>
> i was having the same thing !
>
>
> N8TDL
>
> > Hi folks,
> >
> > I noticed something strange a couple of nights ago too, but it
> > wasn't a frequency shift.  The waterfall on AO40RCV changed
> > suddenly from being a pair of combs to a pair of fuzzy bands.
> > It stayed there for a minute or so, during which telemetry stopped.
> > Then it suddenly changed back, and telemetry resumed.
> >
> > If it happens again, I'll check the telemetry for the magnets
> > being on.  Could there be another problem (like, on my end)?
> >
> > 73s,
> >
> > Greg  KO6TH
> >
> >
> > >From: Peter Guelzow <peter.guelzow@arcormail.de>
> > >To: Howard Long <howard@howardlong.com>
> > >CC: amsat-bb@AMSAT.Org
> > >Subject: Re: [amsat-bb] PSK tone interesting on AO-40
> > >Date: Tue, 03 Jul 2001 20:48:24 +0000
> > >
> > >Hi Howard,
> > >
> > >Howard Long wrote:
> > > >
> > > > Sitting here in the shack listening to AO-40 (and watching the
> > >telemetry)
> > > > tonight, the PSK tone seems to lower by a few tens of hertz for
a
> couple
> > >of
> > > > seconds and then rise back again.
> > > >
> > > > I've never heard this before, but I'm sure someone will be able
to
> > >explain.
> > > > Can't see anything obvious from the telemetry myself.
> > >
> > >This is due to the magnetorquing around perigee...
> > >
> > >73s Peter DB2OS
> > >
> > >
> > >----
> > >Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > >To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> >
> > _________________________________________________________________
> > Get your FREE download of MSN Explorer at http://explorer.msn.com
> >
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> >
>
> - ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
>
> - ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ------------------------------
>
> Date: Wed, 4 Jul 2001 00:37:07 -0000
> From: "Colin Hurst" <hurst_cj@msn.com.au>
> Subject: Re: [amsat-bb] PSK tone interesting on AO-40
>
> Greg,
> You probably heard the ranging that has been carried  out
> by the command stations over the last few days.
> Best regards,
> Colin VK5HI
>
> - ----- Original Message -----
> From: "Greg D." <ko6th_greg@hotmail.com>
> To: <amsat-bb@AMSAT.Org>
> Sent: Tuesday, July 03, 2001 10:01 PM
> Subject: Re: [amsat-bb] PSK tone interesting on AO-40
>
>
> > Hi folks,
> >
> > I noticed something strange a couple of nights ago too, but it
> > wasn't a frequency shift.  The waterfall on AO40RCV changed
> > suddenly from being a pair of combs to a pair of fuzzy bands.
> > It stayed there for a minute or so, during which telemetry stopped.
> > Then it suddenly changed back, and telemetry resumed.
> >
> > If it happens again, I'll check the telemetry for the magnets
> > being on.  Could there be another problem (like, on my end)?
> >
> > 73s,
> >
> > Greg  KO6TH
> >
> >
> > >From: Peter Guelzow <peter.guelzow@arcormail.de>
> > >To: Howard Long <howard@howardlong.com>
> > >CC: amsat-bb@AMSAT.Org
> > >Subject: Re: [amsat-bb] PSK tone interesting on AO-40
> > >Date: Tue, 03 Jul 2001 20:48:24 +0000
> > >
> > >Hi Howard,
> > >
> > >Howard Long wrote:
> > > >
> > > > Sitting here in the shack listening to AO-40 (and watching the
> > >telemetry)
> > > > tonight, the PSK tone seems to lower by a few tens of hertz for
a
> couple
> > >of
> > > > seconds and then rise back again.
> > > >
> > > > I've never heard this before, but I'm sure someone will be able
to
> > >explain.
> > > > Can't see anything obvious from the telemetry myself.
> > >
> > >This is due to the magnetorquing around perigee...
> > >
> > >73s Peter DB2OS
> > >
> > >
> > >----
> > >Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > >To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> >
> > _________________________________________________________________
> > Get your FREE download of MSN Explorer at http://explorer.msn.com
> >
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> - ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ------------------------------
>
> Date: Tue, 03 Jul 2001 19:08:17 -0500
> From: "Mark D. Fossum" <n0nsv@AMSAT.Org>
> Subject: Re: [amsat-bb] cal-amp dc
>
> Hi George!
>
> Here's the place to look: http://communities.msn.com/wc0y
>
> Let me know if you need some PTFE tape and I'll send you a chunk! Have
> fun with your CalAmp Downconverter.
>
> 73,
>
> Mark - N0NSV
> http://www.markfossum.com
>
>
> George Clough wrote:
> >
> > where can I find info on converting a cal-amp 31732 dc. Thanks in
> > advance. W3VVP,George @ goeaston.net.
> >
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> - ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ------------------------------
>
> Date: Tue, 03 Jul 2001 17:51:11 -0700
> From: "Greg D." <ko6th_greg@hotmail.com>
> Subject: [amsat-bb] Ranging question (was PSK tone interesting on
AO-40)
>
> Interesting!  Just what exactly is "Ranging", and what is going on
> with the waterfall?  I had assumed that Ranging was some sort of
> Radar thing, combined with observations of AOS, LOS, AZ, and EL,
> but I guess the satellite plays a more active role...
>
> Just curious,
>
> Greg  KO6TH
>
>
>
> >From: "Colin Hurst" <hurst_cj@msn.com.au>
> >To: "Greg D." <ko6th_greg@hotmail.com>, <amsat-bb@AMSAT.Org>
> >Subject: Re: [amsat-bb] PSK tone interesting on AO-40
> >Date: Wed, 4 Jul 2001 00:37:07 -0000
> >
> >Greg,
> >You probably heard the ranging that has been carried  out
> >by the command stations over the last few days.
> >Best regards,
> >Colin VK5HI
> >
> >----- Original Message -----
> >From: "Greg D." <ko6th_greg@hotmail.com>
> >To: <amsat-bb@AMSAT.Org>
> >Sent: Tuesday, July 03, 2001 10:01 PM
> >Subject: Re: [amsat-bb] PSK tone interesting on AO-40
> >
> >
> > > Hi folks,
> > >
> > > I noticed something strange a couple of nights ago too, but it
> > > wasn't a frequency shift.  The waterfall on AO40RCV changed
> > > suddenly from being a pair of combs to a pair of fuzzy bands.
> > > It stayed there for a minute or so, during which telemetry
stopped.
> > > Then it suddenly changed back, and telemetry resumed.
> > >
> > > If it happens again, I'll check the telemetry for the magnets
> > > being on.  Could there be another problem (like, on my end)?
> > >
> > > 73s,
> > >
> > > Greg  KO6TH
> > >
> > >
> > > >From: Peter Guelzow <peter.guelzow@arcormail.de>
> > > >To: Howard Long <howard@howardlong.com>
> > > >CC: amsat-bb@AMSAT.Org
> > > >Subject: Re: [amsat-bb] PSK tone interesting on AO-40
> > > >Date: Tue, 03 Jul 2001 20:48:24 +0000
> > > >
> > > >Hi Howard,
> > > >
> > > >Howard Long wrote:
> > > > >
> > > > > Sitting here in the shack listening to AO-40 (and watching the
> > > >telemetry)
> > > > > tonight, the PSK tone seems to lower by a few tens of hertz
for a
> >couple
> > > >of
> > > > > seconds and then rise back again.
> > > > >
> > > > > I've never heard this before, but I'm sure someone will be
able to
> > > >explain.
> > > > > Can't see anything obvious from the telemetry myself.
> > > >
> > > >This is due to the magnetorquing around perigee...
> > > >
> > > >73s Peter DB2OS
> > > >
> > > >
> > > >----
> > > >Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > > >To unsubscribe, send "unsubscribe amsat-bb" to
Majordomo@amsat.org
> > >
> > > _________________________________________________________________
> > > Get your FREE download of MSN Explorer at http://explorer.msn.com
> > >
> > > ----
> > > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> >
>
> _________________________________________________________________
> Get your FREE download of MSN Explorer at http://explorer.msn.com
>
> - ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ------------------------------
>
> Date: Tue, 3 Jul 2001 20:58:31 edt
> From: Jesse Morris <w4mvb@juno.com>
> Subject: [amsat-bb] Drake Converter
>
> Good Evening to All,
>
> I'm working on a Drake converter that got flooded.  When I took the
cover
> off there was standing water inside.  The PCB track to the IF
connector
> had been burned (or corroded) away and there was extensive corrosion
on
> the PCB, most of it in the P/S section.  I was able to clean it up
pretty
> well and now the voltages around the rf amp look OK so I think that
part
> will work if I can get the oscillator going.  I managed to get the 8
mhz
> oscillator working by replacing the crystal trimmer with a 5 pf fixed
> capacitor but I still have no mixer injection.  I think I have found
the
> culprit but I don't know what it is!  There are two 4 terminal SM
devices
> between the oscillator section and the mixer with "R27" stamped on the
> package.  The device that is about half way up the oscillator
injection
> trace to the mixer does not appear to be working.  I think these
devices
> are bipolar but they could be some form of FET.  They seem to have
dual
> emitter (or source) connections.  The one under the small shield
appears
> to be a follower (source or emitter) and I think the other is a
straight
> amplifier.  The follower has 10 volts on the collector (or drain), 2.6
> volts on the base (or gate) and 2 volts on the emitter (or source).
The
> other one has 10 volts on the collector (or drain), 3 volt on the base
> (or gate) and zero volts on the emitter (or source).  The level of the
> voltages on the one that's working (at least as far as DC is
concerned)
> leads me to believe that these are bipolar devices but I haven't a
clue
> about what to replace them with.  Can anyone offer any help?  Even an
> educated guess would help.
>
> Thanks,
>
> 73 - de Jess - W4MVB
> - ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ------------------------------
>
> Date: Tue, 3 Jul 2001 20:19:57 -0500
> From: "W5ADC" <radioran@w5adc.com>
> Subject: [amsat-bb] On the Road Again Arkansas EM35 EM43 EM44
>
> I will be on a trip over the next few days.  I will be operating from
EM35
> during some of the passes on Thursday and Friday.  Saturday I will
make a
> run down to EM43 and EM44 in the morning.  Look for me on UO14 and
AO27.
>
> 73's
>
> Anthony (Tony) Campbell
> W5ADC
> tony@w5adc.com
>
> - ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ------------------------------
>
> Date: Wed, 4 Jul 2001 13:29:40 +1200
> From: "Ian Ashley" <iana@kcbbs.gen.nz>
> Subject: RE: [amsat-bb] Ranging question (was PSK tone interesting on
AO-40)
>
> Hi Greg, for full details, check out this url.
> 73 de Ian ZL1AOX.
>
> http://www.amsat.org/amsat/articles/g3ruh/123.html
>
> > -----Original Message-----
> > From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org]On
> > Behalf Of Greg D.
> > Sent: Wednesday, 4 July 2001 12:51
> > To: amsat-bb@AMSAT.Org
> > Subject: [amsat-bb] Ranging question (was PSK tone interesting on
AO-40)
> >
> >
> > Interesting!  Just what exactly is "Ranging", and what is going on
> > with the waterfall?  I had assumed that Ranging was some sort of
> > Radar thing, combined with observations of AOS, LOS, AZ, and EL,
> > but I guess the satellite plays a more active role...
> >
> > Just curious,
> >
> > Greg  KO6TH
>
> - ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ------------------------------
>
> Date: Wed, 4 Jul 2001 02:47:16 +0100
> From: Claudio Martins <ctpm@vega.net.dhis.org>
> Subject: [amsat-bb] Radio Lens
>
>   Well I must say I had never seen a lens like that being used for
radio
> reception! weird... ;)
>
>   http://www.spacedaily.com/news/telescopes-01a.html
>
>
> regards
>
>   Claudio
>   CT3KD
>
> - ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ------------------------------
>
> Date: Tue, 03 Jul 2001 22:04:00 EDT
> From: K5OE@aol.com
> Subject: Re: [amsat-bb] KO-25 Signs of life
>
> Paul,
> The same received here at 0200 utc 04-07-01.  At least it is "alive."
> 73,
> Jerry, K5OE
>
> paul.hamradio@verizon.net writes:
> << Hello All,
> I see "frames received from loader-9" on the KO-25 pass at 04:00 UTC
> This is the first I've seen in quite some time.
> Paul Delaney
> kb2shu.ampr.org [44.16.2.46]
> paul.hamradio@verizon.net
> AMSAT # 33558
>
> - ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>  >>
>
>
> - ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ------------------------------
>
> Date: Tue, 03 Jul 2001 18:11:15 -0800
> From: "Edward R. Cole" <al7eb@ptialaska.net>
> Subject: Re: [amsat-bb] Ranging question (was PSK tone interesting on
AO-40)
>
> >From: "Greg D." <ko6th_greg@hotmail.com>
> >Interesting!  Just what exactly is "Ranging", and what is going on
> >with the waterfall?  I had assumed that Ranging was some sort of
> >Radar thing, combined with observations of AOS, LOS, AZ, and EL,
> >but I guess the satellite plays a more active role...
> >
> >Just curious,
> >
> >Greg  KO6TH
> >
> >>From: "Colin Hurst" <hurst_cj@msn.com.au>
> >>To: "Greg D." <ko6th_greg@hotmail.com>, <amsat-bb@AMSAT.Org>
> >>Subject: Re: [amsat-bb] PSK tone interesting on AO-40
> >>Date: Wed, 4 Jul 2001 00:37:07 -0000
> >>
> >>Greg,
> >>You probably heard the ranging that has been carried  out
> >>by the command stations over the last few days.
> >>Best regards,
> >>Colin VK5HI
>
> Greg,
>
> In the past, ordinary radar plus correlating observations with
predicts
> provided ranging, but radar conducted at planetary distances requires
very
> high power due to the large space loss and target scattering loss.
>
> With earth satellites [or planetary spacecraft] you have an on-board
> transponder that can send back a much stronger signal.  So what they
do [in
> very layman terms] is send a special digital pulse train up to the
> spacecraft which is looped back to earth.  By using precise frequency
and
> pulse timing, very accurate range information can be recovered.
>
> To give an example, I operated ranging in 1974 on the Mariner-10
spacecraft
> that I believe was first to use planetary gravity boost to a secondary
> planet [Venus-to-Mercury].  The mu-II ranging system was accurate to 2
> meters at 60 million km!  I suspect a similar digital ranging system
is
> being used on AO-40 {experts may step in now and bail me out}.
>
> Ed
>
> - ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ------------------------------
>
> Date: Wed, 4 Jul 2001 04:12:05 +0200
> From: "i8cvs" <domenico.i8cvs@tin.it>
> Subject: R: [amsat-bb] G4COM Noise Meter and system tweaking...
>
> The G4COM Noise Meter was described in RADIO COMMUNICATION January
1976 and
> it is a very old design presenting many limitations the most important
of
> wich is due to the fact that it works using the audio of  a  receiver.
>
> Since the wideband of the audio is very narrow,the Noise Meter
instrument is
> continuously  vibrating a little bit up and down making it difficult
to do
> small Noise Figure adjustements.
>
> I dont suggest to directly connect the output of  the above noise
generator
> head to the input of your 2.4 GHz  preamplifier or converter because
the
> output impedance of  the above noise head changes significantly from
the
> OFF to the ON state when  pulsed by the squared signal coming from
cursor of
> potentiometer RV3
>
> The result of this mismatch is that your preamplifier or converter
cannot be
> really adjusted for the lowest Noise Figure because during the ON and
> OFF  state  of your noise head the gain of your preamplifier or
converter
> connected to it changes as well  generating a false S/N measurement.
>
> The metod to radiate noise from your head  connected to an antenna and
> couple enough noise directly to your helix-feed  connected to your
> preamplifier is very nice because the distance from the antenna
radiating
> noise and the receiving helix -feed  acts as an attenuator reducing
the
> effect of the impedance changes from the OFF and ON head
> conditions.
>
> Unfortunately the power of the noise head at 2.4 GHz is very small
> depending on your microwave diode used for it  but it is possible to
bust it
> building the very simple two stage MMICs wideband amplifier described
by
> WB5LUA on the ARRL UHF/Microwave Experimenters Manual Chapter 7
> page 7-38 and 7-39  showing a gain of more than 15 dB at 2.4 GHz
>
> Now connect your noise head to the input of this 15 dB amplifier and
> connect to its output  a 6 turns helix for 2.4 GHz with a gain of
about
> 10 dBi or any other antenna available for 2.4 GHz
>
> Put this antenna looking at your helix feed dish and some wavelenghts
away
> from it.
>
> Remember that the free space attenuation at any frequency is  22 dB at
a
> distance of one waveleght from the antenna and that the attenuation
> increases by 6 dB every time you double this distance.
>
> With all of this in mind you can choose the maximum possible distance
> between the antennas and  than tweak your preamplifier or converter
for
>  the lowest Noise Figure looking at the G4COM  Noise Meter indicator.
>
> In this manner,having the helix feed directly connected to the input
of
> preamplifier or converter  do not disturb its adjustement for the
lowest
> Noise Figure because there are no gain variations due of impedance
> changes between the OFF and ON state of the noise head.
>
> Obviously,since the excess noise ratio ENR of  the noise system is
unknow it
> is impossible to get the Noise Figure of your preamplifier or
converter in
> dB but in any case,after the adjustement, the Noise Figure will be the
> lowest possible to be obtained.
>
> 73 de i8CVS Domenico
>
>
> - ----- Original Message -----
> From: Russ Renaud <ae517@freenet.carleton.ca>
> To: <amsat-bb@AMSAT.Org>
> Sent: Tuesday, July 03, 2001 6:12 PM
> Subject: [amsat-bb] G4COM Noise Meter and system tweaking...
>
>
> > I'm just putting the finishing touches on my G4COM noise meter, and
poking
> > around on the WWW I found some EME articles at the PA3CSG web page
> >
> > http://www.qsl.net/pa3csg/Boek/BoekH2/content2.html
> >
> > and more specific to my noise meter:
> >
> > http://www.qsl.net/pa3csg/Boek/BoekH2/art2-32.html
> >
> > N6IZW kindly provided a microwave diode as a 2.4 GHz noise source to
> > use in conjuction with my meter.
> >
> > How can I couple enough noise into my helix-fed dish to tweak my
> > system?
> >
> > Thanks
> >
> >
> >
> >
> > --
> > 73 de va3rr/aa8lu
> > http://www.qsl.net/va3rr
> > Check out the new Ship Station Regs at:
> > http://www.tc.gc.ca/Actsregs/csa-lmmc/csa63.html
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> >
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> - ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ------------------------------
>
> Date: Wed, 4 Jul 2001 04:46:32 +0200
> From: "i8cvs" <domenico.i8cvs@tin.it>
> Subject: R: [amsat-bb] PSK tone interesting on AO-40
>
> The PSK tone is changing by a few tens of hertz when the magnetorquing
is ON
> because of the high courrent in to the magnet coils producing a small
drop
> of voltage across the battery.
>
> In any case the PSK here using an old for OSCAR-10 ,AMSAT-DL
demodulator
> (AFDEM-BYTREG-SYNINF)
> is perfectly decoded  with CRCC OK blocks on P3T with magnetorquing ON
>
> 73 de i8CVS Domenico
>
> - ----- Original Message -----
> From: Howard Long <howard@howardlong.com>
> To: <amsat-bb@AMSAT.Org>
> Sent: Tuesday, July 03, 2001 9:25 PM
> Subject: [amsat-bb] PSK tone interesting on AO-40
>
>
> > Sitting here in the shack listening to AO-40 (and watching the
telemetry)
> > tonight, the PSK tone seems to lower by a few tens of hertz for a
couple
> of
> > seconds and then rise back again.
> >
> > I've never heard this before, but I'm sure someone will be able to
> explain.
> > Can't see anything obvious from the telemetry myself.
> >
> > I thought at first it was the down converter I was using, but I get
the
> same
> > on my AR-5000 too.
> >
> > 73 Howard G6LVB
> >
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> >
>
>
>
>
>
>
>
> - ----
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> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ------------------------------
>
> Date: Wed, 04 Jul 2001 00:07:46 -0400
> From: "Louis A. Mamakos" <louie@TransSys.COM>
> Subject: Re: [amsat-bb] Radio Lens
>
> >
> >   Well I must say I had never seen a lens like that being used for
radio
> > reception! weird... ;)
> >
> >   http://www.spacedaily.com/news/telescopes-01a.html
>
> These Luneburg lens designs have been around for a little while.  If
you
> take a look at:
>
> http://www.skybridgesatellite.com/l41_sys/index.htm
>
> you can see this type of antenna proposed as part of a LEO satellete
> system.  What's very cool about this type of antenna design is that
> the "lens" part (a variable density dielectric material) remains
fixed,
> and the feed point(s) move over the surface.
>
> louie
> wa3ymh
>
> - ----
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> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ------------------------------
>
> Date: Wed, 4 Jul 2001 02:10:21 -0300
> From: "Paul Willmott" <pwillmott@northrock.bm>
> Subject: Re: [amsat-bb] freedom from the British.
>
> TNX!
>
> Well historically the British royal family are German, ... a bit like
P3D!
>
> ... though I'm not sure Richard will admit this !
>
> Cheers
> Paul, G6KCV
>
> p.s. I only get a half day holiday on the 4th, cos my country only
burnt a
> bit of Washington
>
> - ----- Original Message -----
> From: "Vince Fiscus, KB7ADL" <vlfiscus@mcn.net>
> To: <amsat-bb@AMSAT.Org>
> Sent: Tuesday, July 03, 2001 7:10 PM
> Subject: [amsat-bb] freedom from the British.
>
>
> >
> > July 4th, the day we yanks celebrate our independence from the
British
> over
> > 200 years ago.  Today, some of our best friends are across the ocean
in
> the
> > U.K.  But I just have to say, independence from the British is a
good
> > thing. Can you imagine G3RWL Crown Governor of New Jersey? It'd be a
> circus.
> >
> > Happy 4th yanks! Hats off to the Brits.
> >
> > 73, KB7ADL
> >
> >
> > ----
> > Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> > To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
> >
>
> - ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ------------------------------
>
> Date: Wed, 4 Jul 2001 08:18:28 +0300
> From: "Shlomo" <4x1as@netvision.net.il>
> Subject: [amsat-bb] ALON/ALAT
>
> Orbit 311  tlm shows  ALAT -2  ALON 262
>    73s Shlomo
>
>
> AO-16,UO=22,KO-23,KO-25  Amsast U.K member #3406. QTH  LOCATOR  KM71JV
>
> Internet address  4x1as@amsat.org , 4x1as@netvision.net.il
> 4X1AS. Shlomo Menuhin, 30 Uriel Menuhin,Rehovot,76655, Israel.
>
> - ----
> Via the amsat-bb mailing list at AMSAT.ORG courtesy of AMSAT-NA.
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
>
> ------------------------------
>
> End of AMSAT-BB-digest V2001 #433
> *********************************
>
>
> ----
> This is the AMSAT-BB Digest at AMSAT.ORG courtesy of AMSAT-NA.
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>

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