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CX2SA > SATDIG 30.09.08 02:55l 763 Lines 25820 Bytes #999 (0) @ WW
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From: CX2SA@CX2SA.LAV.URY.SA
To : SATDIG@WW
Today's Topics:
1. NI-MH battert charger (VE6ITV)
2. Re: Wanted: article from April 1989 Oscar News (Don Roland)
3. Re: NI-MH battert charger (Stephen Davis)
4. Re: Telemetry (i8cvs)
5. Shenzhou object number & SpaceX Falcon (Armando Mercado)
6. Re: Shenzhou object number & SpaceX Falcon
(Nigel Gunn G8IFF/W8IFF)
7. Falcon 1 successful (Bob McGwier)
8. Re: Telemetry (Edward Cole)
9. Re: Falcon 1 successful (G0MRF(AT)aol.com)
10. Re: AO-51 L/U very cool! (Gordon JC Pearce MM3YEQ)
11. Kenwood TS 2000 for sale (Bill Bruno)
12. Re: Telemetry + S-meter readings (i8cvs)
----------------------------------------------------------------------
Message: 1
Date: Sun, 28 Sep 2008 22:05:41 -0600
From: "VE6ITV" <ve6itv(AT)shaw.ca>
Subject: [amsat-bb] NI-MH battert charger
To: <amsat-bb(AT)amsat.org>
Message-ID: <002a01c921e8$a8a11cb0$6400a8c0(AT)scotty>
Content-Type: text/plain; charset="iso-8859-1"
Hi, i have a Maha 12v 900mah battery and the charger i have for my other
battery is only for a 7.2v battery. Can someone please tell me what brand of
charger i can buy to charge this battery?. 73 de VE6ITV scott
------------------------------
Message: 2
Date: Mon, 29 Sep 2008 07:34:08 -0300
From: "Don Roland" <dmroland(AT)ca.inter.net>
Subject: [amsat-bb] Re: Wanted: article from April 1989 Oscar News
To: <AMSAT-BB(AT)amsat.org>
Message-ID: <002b01c9221e$ea556cc0$4716ba89(AT)donaldro>
Content-Type: text/plain; charset="iso-8859-1"
I have a copy Douglas if you haven't already
located one.
73 Don VE1AOE
> Does anyone have a copy of (or know where I can
> get a copy of) the article "Determination of Orbital
> Elements Through Distance Measurements" by Stefan
> Eckart? It was published in the April 1989 "Oscar
> News" on pages 22-25.
>
> Douglas KA2UPW/5
>
------------------------------
Message: 3
Date: Mon, 29 Sep 2008 05:06:49 -0700 (PDT)
From: Stephen Davis <davism294(AT)yahoo.com>
Subject: [amsat-bb] Re: NI-MH battert charger
To: VE6ITV <ve6itv(AT)shaw.ca>, amsat-bb(AT)amsat.org
Message-ID: <321840.15396.qm(AT)web58304.mail.re3.yahoo.com>
Content-Type: text/plain; charset=us-ascii
You might want to look at this universal charger/analyizer/conditioner from
Maha Engineering to see if it suits your needs:
http://www.mahaenergy.com/store/item.asp?idproduct=185
73,
Stephen - KJ4FEL
----- Original Message ----
From: VE6ITV <ve6itv(AT)shaw.ca>
To: amsat-bb(AT)amsat.org
Sent: Monday, September 29, 2008 12:05:41 AM
Subject: [amsat-bb] NI-MH battert charger
Hi, i have a Maha 12v 900mah battery and the charger i have for my other
battery is only for a 7.2v battery. Can someone please tell me what brand of
charger i can buy to charge this battery?. 73 de VE6ITV scott
_______________________________________________
Sent via AMSAT-BB(AT)amsat.org. Opinions expressed are those of the author.
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------------------------------
Message: 4
Date: Mon, 29 Sep 2008 14:58:19 +0200
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Subject: [amsat-bb] Re: Telemetry
To: "Tim Tapio" <tim(AT)timtapio.com>, "AMSAT-BB" <amsat-bb(AT)amsat.org>,
"Edward Cole" <kl7uw(AT)acsalaska.net>
Message-ID: <011901c92233$0d100540$0201a8c0(AT)tin.it>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Edward Cole" <kl7uw(AT)acsalaska.net>
To: "Tim Tapio" <tim(AT)timtapio.com>; <amsat-bb(AT)amsat.org>
Sent: Sunday, September 28, 2008 9:48 PM
Subject: [amsat-bb] Re: Telemetry
> Tim,
>
> You realize that the "low-noise figure" preamp is most affective when
> placed at the antenna and that this is because the feedline will
> degrade the noise figure.
>
> How the noise figure is affected, is that the amount of loss in the
> feedline is directly added to the noise figure of the preamp. So if
> your preamp is 0.5 dB NF (a common value for a good Gasfet preamp)
> and your feedline loss is 1.5 dB (what a medium long run of RG-8 or
> RG-213 will have at 70cm) then your overall receiving noise figure is
> about 2.0 dB (actually there is a small amount of degradation
> contributed by your radio's noise figure (which may another 0.1 or
> 0.2 dB if your preamp gain is 20-dB or more).
>
> So when you place your preamp at the antenna, your receivng system NF
> will be close to that of the preamp. You do not need super low loss
> feedling if the preamp is at the antenna. Use what you have
> now. The feedline loss will add directly to the NF of your radio in
> the shack, but the total will be reduced by the gain of the preamp.
>
> I plugged these numbers into my NF program and the result is:
> preamp in shack: system NF = 2.08 dB
> system sensitivity: -139.3 dBm (assuming 2-KHz SSB bandwidth, 150K
> of sky temperature, and 100K of antenna temperature)
> preamp at antenna: system NF = 0.58 dB
> system sensitivity: - 140.9 dBm
>
> So the NF is dramatically reduced and one can copy signals about 1.6
> dB weaker (about 1/2 S-unit). If signals are S7-9, this will not be
> significant but if signals are S0 to S1 it may make the difference
> between copying the signal or not!
Hi Ed, KL7UW
I agree with your calculation and I got the same result working out your
numbars using my hand held calculator:
Preamplifier in the shack:
Noise Figure NF= 2.08 dB
(2.08 / 10 )
Noise Factor F= 10 = 1.61
Equivalent Noise Temperature = (1.61-1) x 290 = 178 kelvin
Preamplifier at the antenna:
Noise Figure NF = 0.58 dB
( 0.58 / 10 )
Noise Factor F = 10 = 1.14
Equivalent Noise Temperature = ( 1.14 - 1) x 290 = 41.4 kelvin
The improvement in S/N can be computed only considering the
equivalent temperatures because into the KTB equation K and B
are constants and so:
178 + 150 + 100
Improvement in S/N = 10 log [ ----------------------] = 1.67 dB
10 41.4 + 150 + 100
Actually you see that assuming a sky temperature of 150 kelvin and an
antenna temperature of 100 kelvin the improvement of S/N = 1.67 dB
only and it is very close to the difference between both Noise Figures
and infact 2.08 - 0.58 = 1.5 dB
But using good antennas as for EME the sky temperature in 70 cm can
be reduced to 30 kelvin and the antenna temperature to only 50 kelvin so
that the improvement in S/N going from an overall Noise Figure of
2.08 dB to 0.58 dB is greater than the difference between the Noise Figures
and changing the sky temperature and the antenna temperature in the above
formula for the EME example the S/N improvement rises to 3.27 dB
The above improvements are calculated in S/N ratio but the S-meter
readings are in (S+N)/N ratio and S/N = [(S+N)/N ]-1 in factor so
that as an example if the S-meter reading is 3 dB or 2 in factor then
S/N = 1 or 0 dB because the signal equals the noise in level.
On the reverse side if the computed S/N ratio is 1.6 dB or 1.44 in
factor then (S+N /N ) = (S/N) + 1 = 2.44 or 3.88 dB wich is about
1/2 of S-unit as you pointed out but if using an EME antenna the
computed improvement in S/N= 3.27 dB or 2.12 in factor then the
S-meter reading will swing to 2.12 +1 = 3.12 in factor or 4.9 dB i.e.
about one S point.
>
> By all means move the preamp to the antenna. No change in feeline is
> need for reception improvement (assuming here that you are not
> planning to use this antenna for transmitting).
>
> 73 Ed - KL7UW
>
I agree and I added the above calculations to show how easily one can
realize that the right place for a low noise preamplifier is as close as
possible to the antenna connector.
Best 73" de
i8CVS Domenico
> At 04:22 AM 9/28/2008, Tim Tapio wrote:
> >Hello all!
> >
> >Two questions on telemetry..
> >
> >1. I was considering dedicating a 70 cm "eggbeater" with a preamp
> > as a good, omni-directional antenna. So far though, it doesn't seem to
> > pick up below 12 degree elevations. Currently the preamp is in the
> > shack (I know,at the antenna) and my coax is not optimum. If I use
> > heliax, put the preamp at the antenna, is this feasible or should I plan
> > on a steerable beam?
> >
> >2. I'm having a dickens of a time figuring out what the telemetry
> >frequencies are. I've looked at DK3WN's site which has the decoding
> >software but I seem to be having issues finding frequencies, am I
> >looking in the wrong places?
> >
> >
> >Thanks for your time!
> >
> >
> >73 de Tim, K4SHF FM04
------------------------------
Message: 5
Date: Mon, 29 Sep 2008 09:31:09 -0400
From: "Armando Mercado" <am25544(AT)triton.net>
Subject: [amsat-bb] Shenzhou object number & SpaceX Falcon
To: <amsat-bb(AT)AMSAT.Org>
Message-ID: <5C8140B4548741F882EE9A433CD71070(AT)hppav>
Content-Type: text/plain; format=flowed; charset="Windows-1252";
reply-type=original
Greetings,
There's been a thread on the BBS about which object is/was
the Shenzhou 7 spacecraft. For what it is worth I have been using
Object A keps. Central China Television (CCTV) covered the flight
extensively and mostly live as it happened. Whenever they showed
the big screen at mission control, my tracking program matched their
screen, so it's Object A for me.
SpaceX Falcon flight 4 made it to orbit. Persistence pays off.
Interesting orbit.
No Common Name Found
1 33393U 08048A 08273.15418783 .00071718 00000-0 92796-2 0 33
2 33393 009.3459 061.8581 0015292 250.8609 108.2346 14.79000846 26
Armando, N8IGJ
------------------------------
Message: 6
Date: Mon, 29 Sep 2008 13:48:48 +0000
From: Nigel Gunn G8IFF/W8IFF <nigel(AT)ngunn.net>
Subject: [amsat-bb] Re: Shenzhou object number & SpaceX Falcon
To: Armando Mercado <am25544(AT)triton.net>
Cc: amsat-bb(AT)amsat.org
Message-ID: <48E0DCC0.6040704(AT)ngunn.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Of course, the spacecraft, as launched, has split into 3 parts to extract the
re-entry module, which has now landed so I guess the question is,
which object is the satellite and is it transmitting anything we can usefully
receive.
Space Track now lists an Objext H.
OBJECT A
1 33386U 08047A 08272.15013951 .00054573 00000-0 29582-3 0 158
2 33386 042.4044 178.2230 0005368 282.1563 235.6774 15.79173201 410
OBJECT B
1 33387U 08047B 08273.16486755 .00325302 82837-5 23439-3 0 190
2 33387 042.4065 171.1579 0089600 151.1146 338.4513 16.06393261 587
OBJECT C
1 33388U 08047C 08273.16548304 .17339353 77079-5 36395-2 0 218
2 33388 042.5562 171.1969 0068223 167.5297 192.7906 16.23206867 581
OBJECT D
1 33389U 08047D 08273.14301888 .09276831 78839-5 39833-2 0 195
2 33389 042.5365 171.6287 0107704 169.6583 340.4200 16.09045925 578
OBJECT E
1 33390U 08047E 08273.03387694 .04395134 77585-5 35557-2 0 47
2 33390 042.2885 173.1463 0175741 141.7480 301.2890 15.88629832 302
OBJECT F
1 33391U 08047F 08273.46256944 .04168032 77011-5 34082-2 0 49
2 33391 042.2350 170.6011 0173283 148.5087 208.4764 15.89010588 365
OBJECT G
1 33392U 08047G 08273.22238605 .00019872 00000-0 11175-3 0 72
2 33392 042.4049 171.6220 0006752 286.1477 212.5348 15.78777424 253
OBJECT H
1 33394U 08047H 08273.15670370 .00057461 00000-0 31173-3 0 37
2 33394 042.4132 172.0125 0005298 291.8156 195.4335 15.79138991 579
Armando Mercado wrote:
> Greetings,
> There's been a thread on the BBS about which object is/was
> the Shenzhou 7 spacecraft. For what it is worth I have been using
> Object A keps. Central China Television (CCTV) covered the flight
> extensively and mostly live as it happened. Whenever they showed
> the big screen at mission control, my tracking program matched their
> screen, so it's Object A for me.
------------------------------
Message: 7
Date: Sun, 28 Sep 2008 23:42:07 -0400
From: "Bob McGwier" <rwmcgwier(AT)gmail.com>
Subject: [amsat-bb] Falcon 1 successful
To: <amsat-bb(AT)amsat.org>
Cc: 'AMSAT BoD' <bod(AT)amsat.org>, 'EAGLE' <eagle(AT)amsat.org>
Message-ID: <005701c921e5$5ab0e6a0$1012b3e0$(AT)com>
Content-Type: text/plain; charset="us-ascii"
Falcon 1 successfully made it to orbit today.
http://www.spacex.com/
Falcon 9 Heavy will be a 12000 Kg to GTO launcher and will almost certainly
have test flights.
http://www.spacex.com/falcon9_heavy.php
and it pays to have friends:
http://www.space-travel.com/reports/Jeff_Ward_To_Head_Up_Avionics_Guidance_A
nd_Control_At_SpaceX_999.html
Bob
N4HY
ARRL SDR Working Group Chair
Member: ARRL, AMSAT, AMSAT-DL, TAPR, Packrats,
NJQRP, QRP ARCI, QCWA, FRC.
"Trample the slow .... Hurdle the dead"
------------------------------
Message: 8
Date: Mon, 29 Sep 2008 06:42:22 -0800
From: Edward Cole <kl7uw(AT)acsalaska.net>
Subject: [amsat-bb] Re: Telemetry
To: <amsat-bb(AT)amsat.org>, "i8cvs" <domenico.i8cvs(AT)tin.it>
Message-ID: <200809291442.m8TEgNOa089829(AT)hermes.acsalaska.net>
Content-Type: text/plain; charset="us-ascii"; format=flowed
Domenico,
I can always depend on you going over my figures. ;-)
One thing you might get a challenge on is sky temp at 70cm. My
original use of Tsky=150K is probably too conservative for some
locations but may be closer to reality in urban areas. I believe the
celestial sky noise is considered to be 70K at 70cm by eme'rs. I
will concede that 100K is probably too high for very well constructed
antennas.
So with quiet locations and better antennas the improvement in
sensitivity can exceed the improvement in NF. This can be realised
by dish antenna as a rule (I generally use 29K for antenna temp on
eme dishes above 1-GHz). For a dish, the edge illumination needs to
be down near -20dB to achieve that kind of antenna temp. For
satelllite reception -15 dB edge taper is sufficient to get antenna
temp of 50K. Achieving this kind of clean pattern with a yagi
antenna is much harder.
Yes, thanks for providing the S+N/N as this is indeed what one reads
on the s-meter. The amount of dB/S-unit varies greatly by radio
(theoretically it should be 6-dB/S-unit). I find on my FT-847 that
the calibration of the s-meter is anywhere from 6-db to 3-dB per unit
and is non-linear. One needs to calibrate their individual radio to
trully know what the s-meter is indicating. S0 to S1 on my radio is about 5-
dB.
73, Ed
At 04:58 AM 9/29/2008, you wrote:
>----- Original Message -----
>From: "Edward Cole" <kl7uw(AT)acsalaska.net>
>To: "Tim Tapio" <tim(AT)timtapio.com>; <amsat-bb(AT)amsat.org>
>Sent: Sunday, September 28, 2008 9:48 PM
>Subject: [amsat-bb] Re: Telemetry
>
> > Tim,
> >
> > You realize that the "low-noise figure" preamp is most affective when
> > placed at the antenna and that this is because the feedline will
> > degrade the noise figure.
> >
> > How the noise figure is affected, is that the amount of loss in the
> > feedline is directly added to the noise figure of the preamp. So if
> > your preamp is 0.5 dB NF (a common value for a good Gasfet preamp)
> > and your feedline loss is 1.5 dB (what a medium long run of RG-8 or
> > RG-213 will have at 70cm) then your overall receiving noise figure is
> > about 2.0 dB (actually there is a small amount of degradation
> > contributed by your radio's noise figure (which may another 0.1 or
> > 0.2 dB if your preamp gain is 20-dB or more).
> >
> > So when you place your preamp at the antenna, your receivng system NF
> > will be close to that of the preamp. You do not need super low loss
> > feedling if the preamp is at the antenna. Use what you have
> > now. The feedline loss will add directly to the NF of your radio in
> > the shack, but the total will be reduced by the gain of the preamp.
> >
> > I plugged these numbers into my NF program and the result is:
> > preamp in shack: system NF = 2.08 dB
> > system sensitivity: -139.3 dBm (assuming 2-KHz SSB bandwidth, 150K
> > of sky temperature, and 100K of antenna temperature)
> > preamp at antenna: system NF = 0.58 dB
> > system sensitivity: - 140.9 dBm
> >
> > So the NF is dramatically reduced and one can copy signals about 1.6
> > dB weaker (about 1/2 S-unit). If signals are S7-9, this will not be
> > significant but if signals are S0 to S1 it may make the difference
> > between copying the signal or not!
>
>Hi Ed, KL7UW
>
>I agree with your calculation and I got the same result working out your
>numbars using my hand held calculator:
>
>Preamplifier in the shack:
>
>Noise Figure NF= 2.08 dB
>
> (2.08 / 10 )
>Noise Factor F= 10 = 1.61
>
>Equivalent Noise Temperature = (1.61-1) x 290 = 178 kelvin
>
>Preamplifier at the antenna:
>
>Noise Figure NF = 0.58 dB
>
> ( 0.58 / 10 )
>Noise Factor F = 10 = 1.14
>
>Equivalent Noise Temperature = ( 1.14 - 1) x 290 = 41.4 kelvin
>
>The improvement in S/N can be computed only considering the
>equivalent temperatures because into the KTB equation K and B
>are constants and so:
>
> 178 + 150 + 100
>Improvement in S/N = 10 log [ ----------------------] = 1.67 dB
> 10 41.4 + 150 + 100
>
>
>Actually you see that assuming a sky temperature of 150 kelvin and an
>antenna temperature of 100 kelvin the improvement of S/N = 1.67 dB
>only and it is very close to the difference between both Noise Figures
>and infact 2.08 - 0.58 = 1.5 dB
>But using good antennas as for EME the sky temperature in 70 cm can
>be reduced to 30 kelvin and the antenna temperature to only 50 kelvin so
>that the improvement in S/N going from an overall Noise Figure of
>2.08 dB to 0.58 dB is greater than the difference between the Noise Figures
>and changing the sky temperature and the antenna temperature in the above
>formula for the EME example the S/N improvement rises to 3.27 dB
>
>The above improvements are calculated in S/N ratio but the S-meter
>readings are in (S+N)/N ratio and S/N = [(S+N)/N ]-1 in factor so
>that as an example if the S-meter reading is 3 dB or 2 in factor then
>S/N = 1 or 0 dB because the signal equals the noise in level.
>
>On the reverse side if the computed S/N ratio is 1.6 dB or 1.44 in
>factor then (S+N /N ) = (S/N) + 1 = 2.44 or 3.88 dB wich is about
>1/2 of S-unit as you pointed out but if using an EME antenna the
>computed improvement in S/N= 3.27 dB or 2.12 in factor then the
>S-meter reading will swing to 2.12 +1 = 3.12 in factor or 4.9 dB i.e.
>about one S point.
> >
> > By all means move the preamp to the antenna. No change in feeline is
> > need for reception improvement (assuming here that you are not
> > planning to use this antenna for transmitting).
> >
> > 73 Ed - KL7UW
> >
>I agree and I added the above calculations to show how easily one can
>realize that the right place for a low noise preamplifier is as close as
>possible to the antenna connector.
>
>Best 73" de
>
>i8CVS Domenico
>
> > At 04:22 AM 9/28/2008, Tim Tapio wrote:
> > >Hello all!
> > >
> > >Two questions on telemetry..
> > >
> > >1. I was considering dedicating a 70 cm "eggbeater" with a preamp
> > > as a good, omni-directional antenna. So far though, it doesn't seem to
> > > pick up below 12 degree elevations. Currently the preamp is in the
> > > shack (I know,at the antenna) and my coax is not optimum. If I use
> > > heliax, put the preamp at the antenna, is this feasible or should I plan
> > > on a steerable beam?
> > >
> > >2. I'm having a dickens of a time figuring out what the telemetry
> > >frequencies are. I've looked at DK3WN's site which has the decoding
> > >software but I seem to be having issues finding frequencies, am I
> > >looking in the wrong places?
> > >
> > >
> > >Thanks for your time!
> > >
> > >
> > >73 de Tim, K4SHF FM04
------------------------------
Message: 9
Date: Mon, 29 Sep 2008 12:12:10 EDT
From: G0MRF(AT)aol.com
Subject: [amsat-bb] Re: Falcon 1 successful
To: amsat-bb(AT)amsat.org
Message-ID: <be7.39b6acb2.3612585a(AT)aol.com>
Content-Type: text/plain; charset="US-ASCII"
In a message dated 29/09/2008 14:32:11 GMT Standard Time,
rwmcgwier(AT)gmail.com writes:
Falcon 1 successfully made it to orbit today.
_http://www.spacex.com/_ (http://www.spacex.com/)
Falcon 9 Heavy will be a 12000 Kg to GTO launcher and will almost certainly
have test flights.
Yup. We should be talking to SpaceX about test flights and as potential fee
paying GTO customers.
Regards
David G0MRF
------------------------------
Message: 10
Date: Mon, 29 Sep 2008 16:06:43 +0100
From: Gordon JC Pearce MM3YEQ <gordonjcp(AT)gjcp.net>
Subject: [amsat-bb] Re: AO-51 L/U very cool!
To: amsat-bb(AT)amsat.org
Message-ID: <48E0EF03.7090502(AT)gjcp.net>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
(resent to the list, rather than original author. Oops.)
DeYoung James wrote:
> Greetings,
>
> I finally decided to try L/U on AO-51 using my IC-910H, SATPC32, 70-cm arrow
on a camera tripod, and a 10-elem. "cheap yagi" for the 1.267-GHz uplink.
Very good signals for all on the downlink most of the pass, however my uplink
on 1.267-GHz is heavily affected by trees, the fact I operate from inside my
home from the 2nd floor, and I was arm-stronging the cheap yagi whilst
twisting for polarization!. Great to hear Angelo, Carmen, Clare, and Mike.
Thanks for calling me back in the group. A very cool mode that works very
well.
>
> 73, JIm (N8OQ ex KG4QWC)
What are you using for the uplink transmitter? I haven't tried L or S
yet, mostly due to lack of equipment. It's on my list though...
I had pretty good results with 2m/70cm using two "cheap yagis" made up
on a bit of inch-by-three-quarter, with a 5-ele 70cm "half" with
elements made of brazing rod, and a 3-ele 2m "half" with the reflector
and director made of ally tubing and the driven element made of kunifer
hydraulic pipe! It took about an hour to build. On the 2m side I was
using my Kenwood TH-F7 and a Jingtong JT-308 for receiving. "But
Gordon", the more experienced amsatters all cry, "the Kenwood is a
dual-bander, you only need that!" - Yes, and that's what I bought it
for. I just haven't built the diplexer yet ;-) For a 15 quid cheapy
Chinese radio from eBay the Jingtong is incredibly sensitive - so much
so that it's practically useless in my back garden in town with all the
SCADA and such tromping up and down the band. Up north where it's quiet
I could hear AO-51 right down to the horizon on 70cm with a K5OE
3-element yagi.
I'm amazed how easy it's been to get started. With a couple of cheap
transceivers (Jingtong do an equally cheap 2m version, which I bet would
work just as well) and a simple homebrew antenna, you can talk to
satellites.
So there you are - I've had my licence a week and a half, and I've
already notched up two contacts on SO-50, one on AO-51 and I've heard
AO-7 (which just seems incredible to me, nearly as old as I am and still
flying). Not bad I think.
Gordon MM3YEQ, in glorious sunny Glasgow.
(and it *is* sunny just now, I'm off to play with aerials)
------------------------------
Message: 11
Date: Mon, 29 Sep 2008 13:42:42 -0400
From: "Bill Bruno" <billbruno(AT)earthlink.net>
Subject: [amsat-bb] Kenwood TS 2000 for sale
To: "Amsat-bb(AT)amsat.org" <amsat-bb(AT)amsat.org>
Message-ID: <DA6611D0983E462B8690DB310A9C1916(AT)billslaptop>
Content-Type: text/plain; format=flowed; charset="Windows-1252";
reply-type=original
Kenwood TS 2000, like new condition, Manual, Power Cable and hand mike.
Asking $1300 plus shipping. Please contact me off list if interested or
have questions.
Bill KB2RC. Amsat # 6986
------------------------------
Message: 12
Date: Mon, 29 Sep 2008 20:09:45 +0200
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Subject: [amsat-bb] Re: Telemetry + S-meter readings
To: "AMSAT-BB" <amsat-bb(AT)amsat.org>, "Edward Cole"
<kl7uw(AT)acsalaska.net>
Message-ID: <001301c9225e$8e6195c0$0201a8c0(AT)tin.it>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Edward Cole" <kl7uw(AT)acsalaska.net>
To: <amsat-bb(AT)amsat.org>; "i8cvs" <domenico.i8cvs(AT)tin.it>
Sent: Monday, September 29, 2008 4:42 PM
Subject: Re: [amsat-bb] Re: Telemetry
> Domenico,
>
> Yes, thanks for providing the S+N/N as this is indeed what one reads
> on the s-meter. The amount of dB/S-unit varies greatly by radio
> (theoretically it should be 6-dB/S-unit). I find on my FT-847 that
> the calibration of the s-meter is anywhere from 6-db to 3-dB per unit
> and is non-linear. One needs to calibrate their individual radio to
> trully know what the s-meter is indicating. S0 to S1 on my radio is about
> 5-dB.
>
> 73, Ed
Hi Ed, KL7UW
I agree with you.
About the " Standardization of S-meter readings at the IARU Region 1
Conference in Miskolc-Tapolca (1978) the following recommendation
was adopted :
IARU Region 1 adopts as a provisional standard the value of 6 dB
for the " S-point", and this value will be recommended to manufacturers
of equipment.
At the meeting of the IARU Region 1 VHF/UHF/SHF/ Committee in
Dusseldorf (April 1989) the following recommendation was adopted,
and later approved by the IARU Region 1 Executive Committee:
The S9 reference level for frequency bands of 144 MHz and above is
-93 dBm available signal power at the receiver input.
Following the above recommendation and using an HP-8640B Signal
Generator I have recalibrated the S-meter readings of my Kenwood
TS-790E
Best 73" de
i8CVS Domenico
------------------------------
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End of AMSAT-BB Digest, Vol 3, Issue 493
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