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CX2SA > SATDIG 12.05.08 06:17l 863 Lines 29178 Bytes #999 (0) @ WW
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Today's Topics:
1. Re: P3E Microwave Frequencies (Jari Koivurinne)
2. Re: P3E Microwave Frequencies (Michael Fletcher)
3. Re: P3E Microwave Frequencies (Trevor)
4. Re: bias tee circuits and components for 2.4 GHz
downconverter (G0MRF(AT)aol.com)
5. Re: bias tee circuits and components for 2.4 GHzdownconverter
(George Henry)
6. CUTE and COMPASS heard (andy thomas)
7. AO-16 2110z 5/11/2008 (John Marranca, Jr)
8. Re: P3E Microwave Frequencies (i8cvs)
9. Re: P3E Microwave Frequencies (i8cvs)
10. Re: AO-51 (jeff)
11. WANTING TO KNOW PASSES USA FOR SEEDS (Mr Jeffrey L Ross)
12. FS Bias Tee (Ronald Long)
13. Putting keps for Delfi in Sat PC32??? (Michael Tondee)
14. Suggestions for Mode L antenna (Ronald Nutter)
15. Re: bias tee circuits and components for 2.4 GHzdownconverter
(kc6uqh)
16. Re: P3E Microwave Frequencies (i8cvs)
----------------------------------------------------------------------
Message: 1
Date: Sun, 11 May 2008 19:16:33 -0000
From: "Jari Koivurinne" <jari.koivurinne(AT)aina.net>
Subject: [amsat-bb] Re: P3E Microwave Frequencies
To: "Stan" <stan(AT)capecod.com>, <amsat-bb(AT)amsat.org>
Message-ID: <ELENKCKBGJGJDOPPNPOGGEGGDDAA.jari.koivurinne(AT)aina.net>
Content-Type: text/plain; charset="us-ascii"
Hello!
The X band downlink is centered at 10,451 MHz, the bandwidth is 38kHz.
There will be a BPSK-beacon at 10,451,030MHz ie. just above the passband.
The beacon is adjusted 6dB lower than the maximum pep of the linear
transponder for easy uplink level adjustment.
S band uplink is 2,439,000 Mhz for 10,450,9992 MHz downlink to be exact.
Maybe we can tweak the last 800 Hz upwards ;-)
This is for the S/X-mode and S band uplink in general.
Sorry for those old frequencies that still exists on P3E websites and old
proposals.
73
Jari, OH3UW, S/X-P3E/P5A-team
> Hello The Net:
>
> Was just at the WWW.KEPS.IT website and saw a proposed frequency
> plan for P3E.
>
> I am starting to plan for Microwave receive only down converters and
> transmit only up converters.
>
> How firm is the frequency for the X band downlink at 10,490 MHz ?
>
> Ditto for the L2 uplink of 1,263 MHz and S band uplink at 2,447 MHz ?
>
-----
> Stan, W1LE FN41sr Cape Cod
>
------------------------------
Message: 2
Date: Sun, 11 May 2008 22:23:02 +0300
From: Michael Fletcher <oh2aue(AT)sral.fi>
Subject: [amsat-bb] Re: P3E Microwave Frequencies
To: amsat-bb(AT)amsat.org
Message-ID: <48274796.4020502(AT)sral.fi>
Content-Type: text/plain; charset=us-ascii; format=flowed
>Hello The Net:
>
>Was just at the WWW.KEPS.IT website and saw a proposed frequency
>plan for P3E.
>
>I am starting to plan for Microwave receive only down converters
>and transmit only up converters.
>
>How firm is the frequency for the X band downlink at 10,490 MHz ?
>
>Ditto for the L2 uplink of 1,263 MHz and S band uplink at 2,447 MHz ?
>
>I am starting to look at possibilities of a common Local Oscillator
>(LO) for some of the bands, but I am having no luck. Having a commonLO
> or at least parts of a LO multiplier chain, would economize and maybe
>lend themselves to being PLLed to the station 10 MHz reference.
>
>Has anyone come up with common LO and IF schemes for multiple P3E
>bands ?
>
>My IC-910H will cover 1,263 MHz nicely, but it looks like all of the
>other higher bands will have a unique LO for the band, at least for
>X band and below.
>
>Time to get ready....
>
>Stan, W1LE FN41sr Cape Cod
There is some contradicting information around regarding the
S band receiver and X band transmitter, but here are the frequencies
the engineering and flight models are being synthesized and
crystalled for as per our efforts to get at least the X band
downlink to a more "standard" frequency:
Center Frequencies for the IF center frequency of 10.700 MHz:
U/D Mode Center Frequency Bandwidth
Uplink Coherent 2438.567 MHz ~2 MHz
Uplink Linear 2439.000 MHz 38 kHz
Downlink Coherent 10451.000 MHz ~2 MHz
Downlink Linear 10451.000 MHz ~2 MHz
Beacon BPSK 10451.030 MHz NB, Modulation dependent
These frequencies were last published in the AMSAT-DL Journal
Nr.4 Jg.33, any other public sources may be unreliable.
73's Michael, OH2AUE
--
"Life is too short for Sudoku"
------------------------------
Message: 3
Date: Sun, 11 May 2008 21:10:14 +0100 (BST)
From: Trevor <m5aka(AT)yahoo.co.uk>
Subject: [amsat-bb] Re: P3E Microwave Frequencies
To: amsat-bb(AT)amsat.org
Message-ID: <347509.14806.qm(AT)web27208.mail.ukl.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
--- Stan <stan(AT)capecod.com> wrote:
> How firm is the frequency for the X band downlink at 10,490 MHz ?
I thought I'd seen an email that indicated it may move lower. I certainly hope
that's the case as in the UK we've lost the top half of the 10 GHz satellite
segment. If the 10 GHz downlink does move that may also affect the freq of the
2.4 GHz uplink as I believe the two are related.
> Ditto for the L2 uplink of 1,263 MHz and S band uplink at 2,447 MHz ?
There are two uplink freqs listed for the 1260 MHz band, presumably which one
is used will depend on the level of interference to the satellites RX from the
Galileo satellites (1260 - 1300 MHz)
73 Trevor M5AKA
__________________________________________________________
Sent from Yahoo! Mail.
A Smarter Email http://uk.docs.yahoo.com/nowyoucan.html
------------------------------
Message: 4
Date: Sun, 11 May 2008 15:52:26 EDT
From: G0MRF(AT)aol.com
Subject: [amsat-bb] Re: bias tee circuits and components for 2.4 GHz
downconverter
To: mat_62(AT)netcommander.com, amsat-bb(AT)amsat.org
Message-ID: <c4f.2a40058b.3558a87a(AT)aol.com>
Content-Type: text/plain; charset="US-ASCII"
Hi Michael.
I see a lot of things written about bias tees, saying they are complicated
or they need particular values of exotic inductor or coupling / decoupling
capacitors.....but all the ones I've 'thrown together' have all worked
perfectly with any converter with a VHF output. (The same is not true for
UHF)
General rule is to use a choke that is a minimum of 10 x the impedance of
the line. So for 50 Ohm cable that's 500 ohms or about 700nH. Generally
don't
go above 2000 ohms as you can run into unwanted resonances in the choke.
But that's a huge range, in practice 470nH to 4.7uH should be fine. - Your
1.5uH is within the limits. I've used iron dust cores from Amidon without
problem.
For the 2 capacitors required, the coupling capacitor and the decoupling cap
to the DC supply, almost anything will do as long as it has a low impedance
at 122MHz. The coupling cap can be 1n to 10nF ceramic. The decoupling
capacitor can be the same value / type. Personally I always add an
electrolytic as
well for the DC connection. 1uF to 47uF will do.
Regards
David
In a message dated 11/05/2008 18:23:12 GMT Standard Time,
mat_62(AT)netcommander.com writes:
I have a Pacific Monolithics surplus MMDS downconverter here that I would
like to get up and running on S-band. It has an 122 MHz IF and I want to whip
up a bias -tee to power it. I've looked at the circuits in the Satellite
Experimeters handbook and my problem is finding an rf choke of the right value
that is readily available in my area. Shouldn't I be able to just wind
something with an air core out of magnet wire or something similar that will
do the
trick? According to the circuit I have I'd need about a 1.5 uh choke for 146
Mhz and it isn't critical so that's probably close enough for my
downconverters IF frequency. I hate to spend shipping charges to get one
little choke or
ferrite core for winding a choke on here. Most places have a minimum order
and I don't need anything else at this time. I'd also welcome links to any
other circuits that might be out there.
Thanks,
Michael, W4HIJ
------------------------------
Message: 5
Date: Sun, 11 May 2008 15:48:28 -0500
From: "George Henry" <ka3hsw(AT)earthlink.net>
Subject: [amsat-bb] Re: bias tee circuits and components for 2.4
GHzdownconverter
To: "amsat bb" <amsat-bb(AT)amsat.org>
Message-ID: <002601c8b3a8$5dfabc10$0400a8c0(AT)parents>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Did you try a local TV repair shop? Many times, I have been able to buy
small parts like chokes from them, when Radio Shack didn't carry them...
----- Original Message -----
From: "Michael Tondee" <mat_62(AT)netcommander.com>
To: "amsat-bb" <amsat-bb(AT)amsat.org>
Sent: Sunday, May 11, 2008 12:01 PM
Subject: [amsat-bb] bias tee circuits and components for 2.4
GHzdownconverter
>I have a Pacific Monolithics surplus MMDS downconverter here that I would
>like to get up and running on S-band. It has an 122 MHz IF and I want to
>whip up a bias -tee to power it. I've looked at the circuits in the
>Satellite Experimeters handbook and my problem is finding an rf choke of
>the right value that is readily available in my area. Shouldn't I be able
>to just wind something with an air core out of magnet wire or something
>similar that will do the trick? According to the circuit I have I'd need
>about a 1.5 uh choke for 146 Mhz and it isn't critical so that's probably
>close enough for my downconverters IF frequency. I hate to spend shipping
>charges to get one little choke or ferrite core for winding a choke on
>here. Most places have a minimum order and I don't need anything else at
>this time. I'd also welcome links to any other circuits that might be out
>there.
> Thanks,
> Michael, W4HIJ
------------------------------
Message: 6
Date: Sun, 11 May 2008 22:04:40 +0100 (BST)
From: andy thomas <andythomasmail(AT)yahoo.co.uk>
Subject: [amsat-bb] CUTE and COMPASS heard
To: amsat <amsat-bb(AT)amsat.org>, compass1cubesat(AT)googlemail.com,
cute1.7_receive(AT)lss.mes.titech.ac.jp
Message-ID: <166956.71519.qm(AT)web27807.mail.ukl.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
Interesting! Two distinct satellite CW transmissions
on the CUTE-1.7 frequency:
1) A very chirpy CW:
00(both zeros) compassuf 00 (zeros)m then 5 zeros
(several times)
b) second cw signal:
38 26 25 -- 64 -1
cute 87 c6 a- a- 4-
17 cute 8-....8 26 24 ....12 1-
with
cc
in there somewhere.
2035-2042 utc approx, 437.275 CW slightly downtuned to
437.274.789 to get a good cw tone, doppler corrected
with Ham radio DeLuxe on yesterday's Cute 1.7 keps.
Rig - ICOM IC-910, WiMo 70cm helix, no preamp.
Locator - IO02NL, UK
I will qsl to the COMPASS satellite office address (
on their website) and copy this report to CUTE-1.7 and
COMPASS teams.
73 de andy G0SFJ
__________________________________________________________
Sent from Yahoo! Mail.
A Smarter Email http://uk.docs.yahoo.com/nowyoucan.html
------------------------------
Message: 7
Date: Sun, 11 May 2008 17:18:51 -0400
From: "John Marranca, Jr" <KB2HSH(AT)amsat.org>
Subject: [amsat-bb] AO-16 2110z 5/11/2008
To: amsat-bb(AT)amsat.org
Message-ID:
<8edcdb130805111418i742d6d04v673359e92379f0a0(AT)mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
Job well done, Mark, on returning AO-16 to service-again!!!
At the beginning of the pass, I had Warbler running...but heard N8MH and
K3SZH as the bird was commanded on.
Excellent pass...worked Allen N5AFV, my neighbor Jeff WB2SYK, and Mark
N8MH...all using my IC-2AT at 1 watt (with the AA alkaline battery pack) as
the uplink.
16 does sound a bit different running half the power she usually does...but
still...it's great to have her back-again!
John KB2HSH
--
_______________________________
John Marranca, Jr
PBX Technician/Shop Steward CWA Local 1122
BN Systems, Inc
Orchard Park, NY
(716)972-2006
------------------------------
Message: 8
Date: Sun, 11 May 2008 23:47:20 +0200
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Subject: [amsat-bb] Re: P3E Microwave Frequencies
To: "Jari Koivurinne" <jari.koivurinne(AT)aina.net>, "Stan"
<stan(AT)capecod.com>, "AMSAT-BB" <amsat-bb(AT)amsat.org>
Message-ID: <002501c8b3b0$97a2bd20$0201a8c0(AT)tin.it>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Jari Koivurinne" <jari.koivurinne(AT)aina.net>
To: "Stan" <stan(AT)capecod.com>; <amsat-bb(AT)amsat.org>
Sent: Sunday, May 11, 2008 9:16 PM
Subject: [amsat-bb] Re: P3E Microwave Frequencies
> Hello!
>
> The X band downlink is centered at 10,451 MHz, the bandwidth is 38kHz.
> There will be a BPSK-beacon at 10,451,030MHz ie. just above the passband.
> The beacon is adjusted 6dB lower than the maximum pep of the linear
> transponder for easy uplink level adjustment.
>
> S band uplink is 2,439,000 Mhz for 10,450,9992 MHz downlink to be exact.
> Maybe we can tweak the last 800 Hz upwards ;-)
> This is for the S/X-mode and S band uplink in general.
>
> Sorry for those old frequencies that still exists on P3E websites and old
> proposals.
>
> 73
> Jari, OH3UW, S/X-P3E/P5A-team
>
Hi Jary, OH3UW and S/X-P3E/P5E- team
I am very happy for the X band downlink centered at 10451 MHz and I
tank you very much for it because I can use the same downconverter
10450-10452 MHz with a 60 cm dish that I have built for AO40 long
time ago before AO40 was launched and never used for it but still
waiting for the future over the roof.
I am less happy for the S band uplink centered at 2439.000 MHz because
for AO40 I have built a transverter for 2400-2402 MHz with a 10 watt
linear amplifier that I used extensively for downlink on AO40 but only one
time for the uplink in mode S/K to demostrate in a scheduled test that the
onboard S-band receiver was efficient.
By the way I know that the primary purposes to change the old S band
uplink frequency choosen for AO40 is to test with P3-E the S/X band
transponder for P5-A in a fixed selected pair of frequencies to get a
coherent mode so that if we want to save 10451.000 MHz for downlink
then 2439.000 MHz for the uplink is mandatory for you in order to use
two syncronized high power 2450.000 MHz magnetrons designed for
microwave oven.
If the S/X transponder with 38 kHz BW will be used extensively in linear
mode for the amateur use on P3-E only then I will build a new transmit
converter for 2439.000 MHz and a new linear amplifier for it.
Best 73" to you and to the S/X-P3E/P5A-team
de i8CVS Domenico
>
>
>
> > Hello The Net:
> >
> > Was just at the WWW.KEPS.IT website and saw a proposed frequency
> > plan for P3E.
> >
> > I am starting to plan for Microwave receive only down converters and
> > transmit only up converters.
> >
> > How firm is the frequency for the X band downlink at 10,490 MHz ?
> >
> > Ditto for the L2 uplink of 1,263 MHz and S band uplink at 2,447 MHz ?
> >
> -----
>
> > Stan, W1LE FN41sr Cape Cod
> >
>
> _______________________________________________
> Sent via AMSAT-BB(AT)amsat.org. 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: 9
Date: Mon, 12 May 2008 00:17:38 +0200
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Subject: [amsat-bb] Re: P3E Microwave Frequencies
To: "Michael Fletcher" <oh2aue(AT)sral.fi>, "AMSAT-BB"
<amsat-bb(AT)amsat.org>
Message-ID: <00a701c8b3b4$d2f95560$0201a8c0(AT)tin.it>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Michael Fletcher" <oh2aue(AT)sral.fi>
To: <amsat-bb(AT)amsat.org>
Sent: Sunday, May 11, 2008 9:23 PM
Subject: [amsat-bb] Re: P3E Microwave Frequencies
>
> There is some contradicting information around regarding the
> S band receiver and X band transmitter, but here are the frequencies
> the engineering and flight models are being synthesized and
> crystalled for as per our efforts to get at least the X band
> downlink to a more "standard" frequency:
>
> Center Frequencies for the IF center frequency of 10.700 MHz:
>
> U/D Mode Center Frequency Bandwidth
>
> Uplink Coherent 2438.567 MHz ~2 MHz
> Uplink Linear 2439.000 MHz 38 kHz
> Downlink Coherent 10451.000 MHz ~2 MHz
> Downlink Linear 10451.000 MHz ~2 MHz
> Beacon BPSK 10451.030 MHz NB, Modulation dependent
>
> These frequencies were last published in the AMSAT-DL Journal
> Nr.4 Jg.33, any other public sources may be unreliable.
>
> 73's Michael, OH2AUE
Hi Michael, OH2AUE
I am very happy for the X band downlink centered at 10451 MHz and I
tank you very much for it because I can use the same downconverter
10450-10452 MHz with a 60 cm dish that I have built for AO40 long
time ago before AO40 was launched and never used for it but still
waiting for the future over the roof.
I am less happy for the S band uplink linear centered at 2439.000 MHz
because for AO40 I have built a transverter for 2400-2402 MHz with
a 10 watt linear amplifier that I used extensively for downlink on AO40
but only one time for the uplink in mode S/K to demostrate in a scheduled
test that the onboard S-band receiver was efficient.
By the way I know that the primary purposes to change the old S band
uplink frequency choosen for AO40 is to test with P3-E the S/X band
transponder for P5-A in a fixed selected pair of frequencies to get a
coherent mode so that if we want to save 10451.000 MHz for downlink
then 2439.000 MHz for the uplink is mandatory for you in order to use
two syncronized high power 2450.000 MHz magnetrons designed for
microwave oven.
If the S/X transponder with 38 kHz BW will be used extensively in linear
mode for the amateur use on P3-E only then I will build a new transmit
converter for 2439.000 MHz and a new linear amplifier for it.
Best 73" de
i8CVS Domenico
------------------------------
Message: 10
Date: Sun, 11 May 2008 18:40:05 -0400
From: "jeff" <kb2m(AT)comcast.net>
Subject: [amsat-bb] Re: AO-51
To: <amsat-bb(AT)amsat.org>
Message-ID: <2D7DD57B8A1F46B1A5E0A8C2B15CA5CC(AT)main>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Well I got everything working, hearing my d/l fine between the fades, had a
great chat with myself. I guess everyone else on the Eastcoast was out to
dinner or something. That's where I'm heading, taking my son Jeff's Mom of
the week out to dinner. l hope everyone had a great mothers day....
73 Jeff kb2m
----- Original Message -----
From: "jeff" <kb2m(AT)comcast.net>
To: "Amsat-Bb" <amsat-bb(AT)amsat.org>
Sent: Friday, May 09, 2008 10:29 AM
Subject: [amsat-bb] AO-51
> Did anyone hear AO-51 s mode d/l on the eastcoast 1420z pass ? My d/l
> converter seems to be powering up, but nothing heard here in FM29. Was it
> off, or do I need to fix my downconverter? Thanks for any useful
> information.
>
> 73 Jeff kb2m
------------------------------
Message: 11
Date: Sun, 11 May 2008 18:48:36 -0400
From: "Mr Jeffrey L Ross" <radiooperator(AT)comcast.net>
Subject: [amsat-bb] WANTING TO KNOW PASSES USA FOR SEEDS
To: "amsat" <amsat-bb(AT)amsat.org>
Message-ID: <006401c8b3b9$28825190$6501a8c0(AT)hamshackcomputer>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Hi folks, would anyone be nice enough to send the USA Passes here to the bb
for seeds. Just a close call would be ok to have. have set up for 437. down
with left hand polar. wanting to copy the cw or even 9600 baud or sstv pic
but no way to set up the sat for the pass at this time. thanks in advance
Sitting in the Midwest, Michigan USA.
KC8GKF
------------------------------
Message: 12
Date: Sun, 11 May 2008 19:09:15 -0400
From: Ronald Long <rlong3(AT)columbus.rr.com>
Subject: [amsat-bb] FS Bias Tee
To: amsat-bb(AT)amsat.org
Message-ID:
<20080511230919.WVNP27093.hrndva-omta01.mail.rr.com(AT)Ron-
Radio.columbus.rr.com>
Content-Type: text/plain; charset="us-ascii"; format=flowed
I have a new unused commercial bias tee for sale.
http://www.teletronics.com/Accessories.html#24ghzbiastee
They call it a Bias Tee/dc injector. Part 17-101 on the above page.
It is in a cast-type box, female N connectors.
Rated at 2.4GHz.
DC connector is type normally used with wall warts.
This might be what you want if you don't want to build and want
guaranteed specs.
ron w8gus
------------------------------
Message: 13
Date: Sun, 11 May 2008 21:13:06 -0400
From: "Michael Tondee" <mat_62(AT)netcommander.com>
Subject: [amsat-bb] Putting keps for Delfi in Sat PC32???
To: "amsat-bb" <amsat-bb(AT)amsat.org>
Message-ID: <001101c8b3cd$5702d490$6500a8c0(AT)w4hij1>
Content-Type: text/plain; charset="iso-8859-1"
I'm about to pull my hair out! I've tried unsuccessfully for the last hour to
put keps for Delfi into SatPC32. I tried a couple of methods posted here on
the BBS and nothing seems to work for me. I'm using the keps on the Delfi C3
website. I cut and pasted them into a text file and put it in the Kepler
folder of the program. I also just tried adding them to one of the existing
txt files in the Kepler folder. Unfortunately I still cannot get anything to
come up when using the program. Can someone explain to me what I might be
doing wrong? Step by step would be best because right now I'm extremely
frustrated.
Tnx and 73,
Michael W4HIJ
------------------------------
Message: 14
Date: Sun, 11 May 2008 20:49:23 -0500
From: Ronald Nutter <rnutter(AT)networkref.com>
Subject: [amsat-bb] Suggestions for Mode L antenna
To: amsat-bb(AT)amsat.org
Message-ID: <4827A223.6020304(AT)networkref.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
I am considering purchasing the 1.2 ghz module for my IC-910H. For my
satellite work, I have my antennas angled at about 20 degrees since I
dont have an az/el rotor. This setup worked reasonably well with Mode S
this weekend. What are my chances to be able to work Mode L with this
kind of setup ? Also, I would appreciate any suggestions for an antenna
that I could use. With only 10 watts, I am not expecting a great signal
but I would hope to have at least a readable signal. Also, would
appreciate any suggestions as to coax/feedline that I should look at
buying ?
Thanks,
Ron
KA4KYI
------------------------------
Message: 15
Date: Sun, 11 May 2008 19:36:31 -0700
From: "kc6uqh" <kc6uqh(AT)cox.net>
Subject: [amsat-bb] Re: bias tee circuits and components for 2.4
GHzdownconverter
To: "Michael Tondee" <mat_62(AT)netcommander.com>, "amsat-bb"
<amsat-bb(AT)amsat.org>
Message-ID: <001001c8b3d8$fcc64820$0200a8c0(AT)kc6uqh>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Michael,
Anything over 0.5 uH should work well, suggest you use 1.5 feet of # 28 to
#36 enameled wire from an old transformer on a 1/2 watt carbon resistor 10K
or larger. Put some of your Wife's fingernail polish on it to hold the wire
in place. A small flame will burn the enamel off the ends of the wire and
clean the soot of with a pen knife or sandpaper, wrap and solder the ends
of the wire to the resistor leads. Use a quality small ceramic capacitor 220
pF to 1000 pf as a blocking capacitor, keep leads very short.
73,
Art, KC6UQH
----- Original Message -----
From: "Michael Tondee" <mat_62(AT)netcommander.com>
To: "amsat-bb" <amsat-bb(AT)amsat.org>
Sent: Sunday, May 11, 2008 10:01 AM
Subject: [amsat-bb] bias tee circuits and components for 2.4
GHzdownconverter
>I have a Pacific Monolithics surplus MMDS downconverter here that I would
>like to get up and running on S-band. It has an 122 MHz IF and I want to
>whip up a bias -tee to power it. I've looked at the circuits in the
>Satellite Experimeters handbook and my problem is finding an rf choke of
>the right value that is readily available in my area. Shouldn't I be able
>to just wind something with an air core out of magnet wire or something
>similar that will do the trick? According to the circuit I have I'd need
>about a 1.5 uh choke for 146 Mhz and it isn't critical so that's probably
>close enough for my downconverters IF frequency. I hate to spend shipping
>charges to get one little choke or ferrite core for winding a choke on
>here. Most places have a minimum order and I don't need anything else at
>this time. I'd also welcome links to any other circuits that might be out
>there.
> Thanks,
> Michael, W4HIJ
> _______________________________________________
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Message: 16
Date: Mon, 12 May 2008 04:46:18 +0200
From: "i8cvs" <domenico.i8cvs(AT)tin.it>
Subject: [amsat-bb] Re: P3E Microwave Frequencies
To: "Stan" <stan(AT)capecod.com>, "AMSAT-BB" <amsat-bb(AT)amsat.org>
Message-ID: <001901c8b3da$5b0732e0$0201a8c0(AT)tin.it>
Content-Type: text/plain; charset="iso-8859-1"
----- Original Message -----
From: "Stan" <stan(AT)capecod.com>
To: <amsat-bb(AT)amsat.org>
Sent: Sunday, May 11, 2008 4:28 PM
Subject: [amsat-bb] P3E Microwave Frequencies
> Hello The Net:
> plan for P3E.
>
> I am starting to plan for Microwave receive only down converters and
> transmit only up converters.
>
> How firm is the frequency for the X band downlink at 10,490 MHz ?
>
> Ditto for the L2 uplink of 1,263 MHz and S band uplink at 2,447 MHz ?
Hi Stan, W1LE
For the uplink in L1 and L2 of AO40 I have used homebrewed transmit
converters to cover 1268-1270 MHz with an IF 144-146 MHz but for P3-E
the L1 must cover 1268-1270 MHz while the L2 must cover 1260-1262 MHz
The L1 is the old uplink from 1268-1270 MHz on AO40 and it will continue
to be used for P3-E if we amateurs we don't interfere with the new Galileo
satellite-navigation-system that will use part of the 1268-1270 MHz band
The L2 is the uplink from 1260-1262 MHz and it will be used as a Galileo
alternative "only ?" if we amateurs will interfere with the Galileo system.
By the way using transmit-converters with a 144-146 MHz IF will produce
interference while receiving in 2400-2402 MHz using a downconverter with
the same IF between 144-146 MHz
For the above reason and for the 23 cm transmit-converter I have changed the
IF to 146-148 MHz using the following XTAL's with the followig
multiplication and conversion.
L1
LO XTAL: 93.500 MHz
Multiplier 93.500 x 12 =1122 MHz
Conversion 1122 + 146 =1268 MHz
1122 + 148 =1270 MHz
L2 (Galileo alternative)
LO XTAL 92.833333 MHz
Multiplier 92.833333 x 12= 1114 MHz
Conversion 1114 + 146 = 1260 MHz
1114 + 148 = 1262 MHz
Using the above transverter setup with a linear amplifier both antenna
mounted there are no problems if only the L1 or only the L2 will be
used extensively for long periods of time but if unfortunately P3-E will
be scheduled to go one day in L1 and another day in L2 then using
transverters we loose the frequency agility because at every change
we must tune again the multipliers and the linear amplifiers over the roof.
Tanks to the S/X-P3E/P5A-team the X band linear downlink of P3-E will
be 10451.000 MHz centered so that it will be possible to reuse the old
10450-10452 MHz dowconverters already built for AO40 but never
used for it.
My homebrewed 10450-10452 MHz downconverter uses a 146-148 MHz
IF with a 107.333333 MHz XTAL as follows:
First multiplier = 107.333333 x 24 = 2576 MHz
Second multiplier = 2576 x 4 = 10304 MHz
Conversion = 10304 + 146 = 10450 MHz
= 10304 + 148 = 10452 MHz
>
> I am starting to look at possibilities of a common Local Oscillator (LO)
> for some of the bands, but I am having no luck. Having a common LO or at
> least
> parts of a LO multiplier chain, would economize and maybe lend
> themselves to being PLLed
> to the station 10 MHz reference.
I believe it is a difficult task considering all possible "birdies" falling
into the different bands.
>
> Has anyone come up with common LO and IF schemes for multiple P3E bands ?
>
Long time ago I have seen a project over a ARRL Proceedings Microwave
Update for OSCAR-13 but I have to look for it.
>
> My IC-910H will cover 1,263 MHz nicely, but it looks like all of the
> other higher
> bands will have a unique LO for the band, at least for X band and below.
>
I believe that in real life from the point of view of the frequency agility
your IC-910H is much better than using separate transmit-converters and
down-converters covering from 2 meters to 23 cm
>From 13 cm and up to the X band the downconverters and transmit-comnverters
are mandatory
> Time to get ready....
>
> Stan, W1LE FN41sr Cape Cod
>
I agree
Have fun and 73" de
i8CVS Domenico
------------------------------
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