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CX2SA > SATDIG 31.12.08 11:25l 806 Lines 25512 Bytes #999 (0) @ WW
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To : SATDIG@WW
Today's Topics:
1. "Newbie" Need's Help working AO-07 (racer5039)
2. Re: FM receiver filters (Anthony Monteiro)
3. Re: ISS Repeater (Ransom, Kenneth G. (JSC-OC)[BAR])
4. Re: ISS Repeater (Bob Bruninga )
5. Re: FM receiver filters (Bob Bruninga )
6. Re: "Newbie" Need's Help working AO-07 (Alan Sieg WB5RMG)
7. ISS L / v Repeater 03.41utc UK / Europe Pass (David Barber)
8. Re: ARISS Antenna Specifics (Clare Fowler)
9. Re: lindenblad observations (Edward Cole)
10. LOTW &/or eQSL ? (Alan Sieg WB5RMG)
11. Re: lindenblad observations (Sven Arne Astrup)
12. ISS L / v Repeater 05.16utc UK / Europe Pass (David Barber)
13. Re: ISS Repeater (Greg D.)
14. Re: LOTW &/or eQSL ? (John W Lee)
15. Re: FM receiver filters (Art McBride)
----------------------------------------------------------------------
Message: 1
Date: Tue, 30 Dec 2008 17:43:55 -0600
From: "racer5039" <racer5039@x.xxx>
Subject: [amsat-bb] "Newbie" Need's Help working AO-07
To: <amsat-bb@xxxxx.xxx>
Message-ID: <BLU102-DAV6573C34FF568A5617F56DACE70@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
I am new to working the Sats so if I am in need of "directions" please feel
free to set me in the right direction.
With that said, I am having problems working AO-07 and the other SSB sats.
I can copy stations vary well but I can't seem to keep on track with them.
I am using HRD and a TS-2000. The antennas are a KLM on the 2m side without
the phase switch hooked up(got cold on me too soon) On the 432 side I am using
a home brew Yaga that I found on KC4UMO's web page. It seems to be working OK.
I really think it me and the tuning. Can anyone point me in the right
direction on these birds?
On the 2230 pass for AO-07 I called K3SZH and I think he was calling me back
but I couldn't keep up with the tuning.
Later when I found him again, he was in a QSO with another station and I
thought I better not interrupt.
Sorry Joe. I did hear you talking about me. Any information would be a great
help.
Marv.
N0FJP
EN34
------------------------------
Message: 2
Date: Tue, 30 Dec 2008 20:19:12 -0500
From: Anthony Monteiro <aa2tx@xxxxxxx.xxx>
Subject: [amsat-bb] Re: FM receiver filters
To: G0MRF@xxx.xxxx amsat-bb@xxxxx.xxx
Message-ID: <20081231011902.8CV1J2Y00E8AG@xxxxxxxx.xxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 05:41 PM 12/30/2008, G0MRF@xxx.xxx wrote:
>Hi all.
>
>I'm trying to find some 455kHz filters suitable for FM +/- some doppler.
>Ideally, 30kHz wide and fairly small
>
>I have some by Murata. Types BLFYM-455C and BLFCM-455C but these are +/-
>12.5k.
>
>Any ideas? I've checked Digikey, but they only seem to list narrow band FM
>or AM filters.
>Is there a Murata or Toko distributor that I've missed?
>
>Thanks
>
>David G0MRF
>_______________________________________________
Hi David,
www.Mouser.com carries quite a few of the Murata filters
including this one: CFULA455KB2A-B0
which is spec'd at +/- 15KHz @ -6dB and is US$3.92 in qty 1.
Happy New Year and 73,
Tony AA2TX
------------------------------
Message: 3
Date: Tue, 30 Dec 2008 20:18:21 -0600
From: "Ransom, Kenneth G. (JSC-OC)[BAR]" <Kenneth.G.Ransom@xxxx.xxx>
Subject: [amsat-bb] Re: ISS Repeater
To: "Greg D." <ko6th_greg@xxxxxxx.xxx>, <w5ggw@xxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID:
<A2862DA1C49F4145AF6C2A452829403501C91B17@xxxxxxxxxx.xxx.xxxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
The ISS radio system currently supports only one mode at a time. The current
L/v configuration is scheduled to be active until Saturday, Jan 3.
And I don't think you can't get into the 1.2 GHz uplink without a yagi ;)
Kenneth - N5VHO
________________________________
From: amsat-bb-bounces@xxxxx.xxx on behalf of Greg D.
Sent: Tue 12/30/2008 2:24 PM
To: w5ggw@xxxxxxxx.xxx
Cc: amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: ISS Repeater
Hi Gregg,
Yes, I have worked the ISS APRS from the D7, but I thought the 145.800 voice
downlink was paired with a 1.2 ghz uplink this week. I didn't think to try
the other modes. Are they up too?
Greg KO6TH
> Date: Tue, 30 Dec 2008 14:10:14 -0600
> From: w5ggw@xxx.xxx
> To: ko6th_greg@xxxxxxx.xxx
> CC: conimicut@xxxxx.xxxx amsat-bb@xxxxx.xxx
> Subject: Re: [amsat-bb] Re: ISS Repeater
>
>
>
> Greg D. wrote:
> > Hi Ron,
> >
> > I heard you on the ISS repeater this morning, around 17:20z I think.
> > Nice signal received on my Kenwood D7 HT with a Diamond RH-77B antenna
> > attached. The second station I heard (I assume it was Jeff, but
> > don't remember the call sign) was actually a bit stronger, but I
> > expect it was just the position of the Station relative to me (CM98).
> >
> > I was out on a walk with my wife, so couldn't try to get back to you.
>
> Even without the yagi, I bet you could of gotten in. I've worked APRS on
the D7
> off the ISS without problems, standing in the yard without a yagi.
>
> Gregg Wonderly
> W5GGW
_________________________________________________________________
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_______________________________________________
Sent via AMSAT-BB@xxxxx.xxx. Opinions expressed are those of the author.
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------------------------------
Message: 4
Date: Tue, 30 Dec 2008 22:09:02 -0500 (EST)
From: "Bob Bruninga " <bruninga@xxxx.xxx>
Subject: [amsat-bb] Re: ISS Repeater
To: "Ransom, Kenneth G. (JSC-OC)[BAR]" <Kenneth.G.Ransom@xxxx.xxx>,
"Greg D." <ko6th_greg@xxxxxxx.xxx>, w5ggw@xxxxxxxx.xxx
Cc: amsat-bb@xxxxx.xxx
Message-ID: <20081230220902.AIN10264@xxx.xxxxxxx.xxxx.xxx>
Content-Type: text/plain; charset=us-ascii
> The ISS radio system currently supports
> only one mode at a time. The current
> L/v configuration is scheduled to be
> active until Saturday, Jan 3.
>
> And I don't think you can't get into
> the 1.2 GHz uplink without a yagi ;)
The most important thing is proper Doppler compensation. At 1.2 ghz the
Doppler is from -25 KHz to plus 25 KHz or so, and you have to be within a few
KHz, or your splatter will not open the squelch of the repeater.
With 11 full Doppler steps during a pass, you have to nail it exactly or you
dont get through he 12.5 KHz filter. Plus I bet even being 2.5 KHz off
between each step and speaking fully, will splatter so much as to keep the
squelch closed.
So in that case, there are 22 discrete windows of opportunity, only half of
which are useable, so it takes real care to get through. Of course, I am only
kibitzing, since I have not tried it, but all the signals I have heard do NOT
seem to be suffering power limitation, but all seem to be suffering off-
frequency splatter and therefore squelch unreliability.
Maybe setting narrow band deviation (as used in europe) will reduce the
spaltter and keep the squelch open better.
Good luck!
Bob, WB4APR
I'd suggest setting narroband deviation too, to help prevent
------------------------------
Message: 5
Date: Tue, 30 Dec 2008 22:13:19 -0500 (EST)
From: "Bob Bruninga " <bruninga@xxxx.xxx>
Subject: [amsat-bb] Re: FM receiver filters
To: Anthony Monteiro <aa2tx@xxxxxxx.xxx>, G0MRF@xxx.xxxx
amsat-bb@xxxxx.xxx
Message-ID: <20081230221319.AIN10281@xxx.xxxxxxx.xxxx.xxx>
Content-Type: text/plain; charset=us-ascii
>> I'm trying to find some 455kHz
>> filters suitable for FM +/- some
>> doppler. Ideally, 30kHz wide
>> and fairly small
We did that on the uplink receivers for PCSAT-1 and -2 so that uplink doppler
on UHF was pretty liberal. We used the old xtal controlled HAMTRONICS
receivers, with the "wideband" and "9600 baud" options to make the receiver
about 30 KHz wide. This of course suffered about 4 dB performance loss, but
with a 25W uplink, the 4 dB was an insignificant loss compared to the ablity
to hear a signal with +/- 6 KHz or more Doppler without splatter.
Bob, WB4APR
------------------------------
Message: 6
Date: Tue, 30 Dec 2008 21:27:22 -0600 (CST)
From: "Alan Sieg WB5RMG" <wb5rmg@xxxxxxx.xxx>
Subject: [amsat-bb] Re: "Newbie" Need's Help working AO-07
To: amsat-bb@xxxxx.xxx
Message-ID: <2272.192.168.121.31.1230694042.squirrel@xxx.xxx.xxx.xx>
Content-Type: text/plain;charset=iso-8859-1
N0FJP said:
> I am new to working the Sats so if I am in need of "directions"
> please feel free to set me in the right direction.
>
> With that said, I am having problems working AO-07 and the other SSB sats.
>
>I can copy stations vary well but I can't seem to keep on track with them.
Marv,
I can provide some direction ...
- whether it is considered the 'right direction' remains to be seen.
I was brought up in the 'old school' before CAT and HRD assisted tuning,
so I'll describe the manual tuning mode I've used since way back.
A couple of starting points to keep in mind:
1. doppler affects both uplink and downlink, moreso the higher freq.
2. you need hear yourself, anyone calling you back will be on your downlink.
3. It is not considerate to 'sweep' your Tx around the band
looking for yourself - better to sweep your receiver.
I'll have a table of 'un-doppler-d' transponder freqs, like this for VU-52:
up (LSB) dn (USB)
... ...
435.260 145.290
435.250 145.900
435.240 145.910
... ...
As the pass starts, lets say I'll set Tx for 435.240 (LSB)...
then I'll set the Tx to CW and send a string of dits with the keyer.
I'll tune around with the Rx until I hear my dits, and zero beat them.
In otherwords, tune Rx until the pitch goes down to nothing. Then I'll
switch Tx back to LSB and whistle, and slightly adjust Rx to perfectly match
the pitch of my whistle in the headset. Now as I call CQ, I can gradually
tweak the Tx freq to keep the pitch normal so that I don't need to adj
the Rx. I try to keep the Rx coming out in the same place, so I'm only
trying to keep up with one knob (Tx)... When someone comes back, they may
drift across the band a bit, and I follow them (Rx) - assuming they are
also following themself. Then when it is my turn to Tx, I first whistle
and tweak my Tx for that zero-beat of the pitch, and start talking...
I guess I've had plenty of practice, as it comes easy for me.
If the other station is adjusting their Tx to keep a steady Rx freq,
then each of us only needs adjust the Tx freq along the way...
At least that's the way I learnt it, you know - back in the day.
Sometimes good practice for 'newbies' is to whistle to themselves,
and get some practice finding their downlink and matching the tone.
This method works with manual tuning, others may have additional suggestions.
Probably the guys using CAT have methods that better suit their needs.
The FM satellites obviously don't have the passband to waller'round in.
My radio is a Yaesu FT-736 and has the ability to lock the two VFOs once
you hit that zero-beat, but as short as the LEO passes are, I hardly ever
do that. Back in the day of AO-13, it was common to lock them and run up
and down the passband looking for other stations. Find one, unlock for a
quick zero-beat whistle, and lock it back... I do miss that bird...
I don't get on a lot, and may only get one or two contacts per pass, but
I prefer linear transponders over FM, so listen for me... I'll be the one
whistling alot. Looks like VO-52 is coming up AOS about 0340z for me.
73 for now, let us know how it goes. /;^)
--
<- Licensed in 1976, WB5RMG = Alan Sieg * AMSAT#20554 ->
<- http://www.somenet.net * http://wb5rmg.somenet.net ->
<- http://www.linkedin.com/in/alansieg * My 'Day Job' ->
------------------------------
Message: 7
Date: Wed, 31 Dec 2008 03:58:24 -0000
From: "David Barber" <david.barber@xxxxxxxxxxxxx.xx.xx>
Subject: [amsat-bb] ISS L / v Repeater 03.41utc UK / Europe Pass
To: <amsat-bb@xxxxx.xxx>, <sarex@xxxxx.xxx>
Cc: "'Frank H. Bauer'" <ka3hdo@xxxxxxx.xxx>
Message-ID: <F07F2CCEE08B47CA8B6AE3EF267CE587@xxxxxxxx>
Content-Type: text/plain; charset="us-ascii"
Repeater active for 03.41utc UK / Europe Pass.
At 60dg elevation 180dg az. I just made it in but very briefly and with a
very scratchy signal. Downlink recorded.
Equipment: Icom 910, horizontal 19el yagi on a tripod mount on my patio.
David
G8OQW.
------------------------------
Message: 8
Date: Tue, 30 Dec 2008 22:59:28 -0500
From: "Clare Fowler" <lcfowler@xxxxx.xx>
Subject: [amsat-bb] Re: ARISS Antenna Specifics
To: "Frank H. Bauer" <ka3hdo@xxxxxxx.xxx>, "amsat-bb"
<amsat-bb@xxxxx.xxx>
Message-ID: <003401c96afc$2f0e77f0$981d70cf@xxxxx>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";
reply-type=original
Thanks for the info Frank.
While the spiral dual L/S band ant may nominially be Left Hand Circular
it must be highly eliptical otherwise I would not be getting into it at all
with 10 watts into my Right Hand Helix antenna array. I have Right Hand
and Left Hand helix antennas for 70 cm and on AO-51 when I switch
to the wrong polarity an over S9 signal drops by more than 20 db into the
noise.
So whatever the polarity it is possible to get into ISS on L band
with Right Hand uplink although Left Hand should be better.
Clare VE3NPC
----- Original Message -----
From: "Frank H. Bauer" <ka3hdo@xxxxxxx.xxx>
To: <amsat-bb@xxxxx.xxx>
Sent: Tuesday, December 30, 2008 12:52 PM
Subject: [amsat-bb] ARISS Antenna Specifics
> All,
>
> The ARISS L-band/S-band antenna systems are Left Hand Circularly
> Polarized.
> There are some good details of the antenna systems in this paper:
>
> http://www.amsat.org/amsat/ariss/Papers/Phase%202%20AGM03Final.pdf
>
> And this presentation:
>
> http://www.amsat.org/amsat/ariss/Presentations/AMSAT%20Symposiums/AMSAT03.pd
> f
>
> Chart 25 of the above presentation shows the antenna locations looking
> down
> the axis of the Service Module. In this picture, the ISS velocity vector
> is
> either in or out of the page and Earth is towards the bottom of the page.
> This assumes they are in the normal Earth pointing mode (which is not
> always
> a given).
>
> We have some good on-orbit views of the antennas in this set of charts
> too.
> Enjoy!
>
> I hope this helps. And thanks for all the interest in ARISS.
>
> 73, Frank, KA3HDO
> _______________________________________________
> 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: 9
Date: Tue, 30 Dec 2008 19:10:40 -0900
From: Edward Cole <kl7uw@xxxxxxxxx.xxx>
Subject: [amsat-bb] Re: lindenblad observations
To: Joe Krepps <occupant@xxxxxxx.xxx>, amsat-bb@xxxxx.xxx
Message-ID: <200812310410.mBV4Afnl060519@xxxxx.xxxxxxxxx.xxx>
Content-Type: text/plain; charset="us-ascii"; format=flowed
At 09:32 AM 12/30/2008, Joe Krepps wrote:
>Thank you, Frank! :)
>
>I do have an Arrow antenna but I never seem to have time to wave it in
>the air. However, I do spend a lot of time driving so an antenna
>solution which could be used mobile is appealing.
>
>I've seen one or two other Lindenblad designs but the AA2TX
>"EZ-Lindenblad" looks strong enough for mobile use.
>
>73!
>Joe
>WB3CFN
>FM20
I am considering building a pair of the AA2TX Lindenblad antennas,
but cannot remember what issue of the Amsat Journal published the
design. I went thru all of them from mid-2006 to current and somehow
miss the article.
73, Ed KL7UW
------------------------------
Message: 10
Date: Tue, 30 Dec 2008 22:56:30 -0600 (CST)
From: "Alan Sieg WB5RMG" <wb5rmg@xxxxxxx.xxx>
Subject: [amsat-bb] LOTW &/or eQSL ?
To: amsat-bb@xxxxx.xxx
Message-ID: <3372.192.168.121.31.1230699390.squirrel@xxx.xxx.xxx.xx>
Content-Type: text/plain;charset=iso-8859-1
I started using eQSL a year or so back, and have only recently seen enough
action in my log to warrant uploading new contacts. I've been trying to
go back thru old logs, and get caught up on returning some QSLs...
Seems what I'm hearing is that some do eQSL, some LOTW, others only paper...
Reckon is there any harm in also doing LOTW ? How many do both ?
I'm sure that there are some that don't do either - no great loss I guess.
/;^)
--
<- Licensed in 1976, WB5RMG = Alan Sieg * AMSAT#20554 ->
<- http://www.somenet.net * http://wb5rmg.somenet.net ->
<- http://www.linkedin.com/in/alansieg * My 'Day Job' ->
------------------------------
Message: 11
Date: Wed, 31 Dec 2008 06:03:29 +0100
From: "Sven Arne Astrup" <sastrup@xxxxxx.xx>
Subject: [amsat-bb] Re: lindenblad observations
To: "'Edward Cole'" <kl7uw@xxxxxxxxx.xxx>
Cc: amsat-bb <amsat-bb@xxxxx.xxx>
Message-ID: <388CE36EF3974739A957985C3E156AFA@xxxxxxxxxxxxxx>
Content-Type: text/plain; charset="iso-8859-1"
Hi Ed!
Take a look here:
http://k9zw.wordpress.com/2007/08/02/club-antenna-build-01/
Happy New Year to you and yours!
73 de Sven LA6KJ
-----Opprinnelig melding-----
Fra: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx P? vegne
av Edward Cole
Sendt: 31. desember 2008 05:11
Til: Joe Krepps; amsat-bb@xxxxx.xxx
Emne: [amsat-bb] Re: lindenblad observations
At 09:32 AM 12/30/2008, Joe Krepps wrote:
>Thank you, Frank! :)
>
>I do have an Arrow antenna but I never seem to have time to wave it in
>the air. However, I do spend a lot of time driving so an antenna
>solution which could be used mobile is appealing.
>
>I've seen one or two other Lindenblad designs but the AA2TX
>"EZ-Lindenblad" looks strong enough for mobile use.
>
>73!
>Joe
>WB3CFN
>FM20
I am considering building a pair of the AA2TX Lindenblad antennas,
but cannot remember what issue of the Amsat Journal published the
design. I went thru all of them from mid-2006 to current and somehow
miss the article.
73, Ed KL7UW
_______________________________________________
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
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------------------------------
Message: 12
Date: Wed, 31 Dec 2008 05:41:26 -0000
From: "David Barber" <david.barber@xxxxxxxxxxxxx.xx.xx>
Subject: [amsat-bb] ISS L / v Repeater 05.16utc UK / Europe Pass
To: <amsat-bb@xxxxx.xxx>, <sarex@xxxxx.xxx>
Message-ID: <6D7802EC72E149A7AC4EB67BC2002DC9@xxxxxxxx>
Content-Type: text/plain; charset="US-ASCII"
Repeater active for 05.16utc UK / Europe Pass.
A better pass for me this time, directly overhead and consequently a little
longer access time. Downlink recorded.
No other stations heard.
David
G8OQW.
------------------------------
Message: 13
Date: Tue, 30 Dec 2008 21:53:19 -0800
From: "Greg D." <ko6th_greg@xxxxxxx.xxx>
Subject: [amsat-bb] Re: ISS Repeater
To: <bruninga@xxxx.xxx>, <kenneth.g.ransom@xxxx.xxx>,
<w5ggw@xxxxxxxx.xxx>
Cc: amsat-bb@xxxxx.xxx
Message-ID: <BLU133-W36B0D7250600458889B446A9E40@xxx.xxx>
Content-Type: text/plain; charset="iso-8859-1"
> From: bruninga@xxxx.xxx
> Subject: Re: [amsat-bb] Re: ISS Repeater
> To: Kenneth.G.Ransom@xxxx.xxxx ko6th_greg@xxxxxxx.xxxx w5ggw@xxxxxxxx.xxx
> CC: amsat-bb@xxxxx.xxx
> Date: Tue, 30 Dec 2008 22:09:02 -0500
>
> > The ISS radio system currently supports
> > only one mode at a time. The current
> > L/v configuration is scheduled to be
> > active until Saturday, Jan 3.
> >
> > And I don't think you can't get into
> > the 1.2 GHz uplink without a yagi ;)
>
> The most important thing is proper Doppler compensation. At 1.2 ghz the
Doppler is from -25 KHz to plus 25 KHz or so, and you have to be within a few
KHz, or your splatter will not open the squelch of the repeater.
>
> With 11 full Doppler steps during a pass, you have to nail it exactly or you
dont get through he 12.5 KHz filter. Plus I bet even being 2.5 KHz off
between each step and speaking fully, will splatter so much as to keep the
squelch closed.
>
> So in that case, there are 22 discrete windows of opportunity, only half of
which are useable, so it takes real care to get through. Of course, I am only
kibitzing, since I have not tried it, but all the signals I have heard do NOT
seem to be suffering power limitation, but all seem to be suffering off-
frequency splatter and therefore squelch unreliability.
>
> Maybe setting narrow band deviation (as used in europe) will reduce the
spaltter and keep the squelch open better.
>
> Good luck!
> Bob, WB4APR
>
> I'd suggest setting narroband deviation too, to help prevent
Yeah, I think it's going to be one hand on the mike and the other on the
uplink tuning knob, adjusting it real-time by ear. I can use the computer to
keep the antennas and downlink radio on track, but the rest is going to be up
to me.
Greg KO6TH
_________________________________________________________________
Life on your PC is safer, easier, and more enjoyable with Windows Vista?.
http://clk.atdmt.com/MRT/go/127032870/direct/01/
------------------------------
Message: 14
Date: Tue, 30 Dec 2008 21:51:31 -0800
From: John W Lee <k6yk@xxxx.xxx>
Subject: [amsat-bb] Re: LOTW &/or eQSL ?
To: wb5rmg@xxxxxxx.xxx
Cc: amsat-bb@xxxxx.xxx
Message-ID: <20081230.215628.3704.1.k6yk@xxxx.xxx>
Content-Type: text/plain; charset=us-ascii
Alan,
There is no reason you can't upload to both E-QSL and LOTW.
I send in my logs monthly to both. E-QSL's really don't count for any
of the major awards.
LOTW confirmations count for DXCC and WAS.
73,
John K6YK
On Tue, 30 Dec 2008 22:56:30 -0600 (CST) "Alan Sieg WB5RMG"
<wb5rmg@xxxxxxx.xxx> writes:
> I started using eQSL a year or so back, and have only recently seen
> enough
> action in my log to warrant uploading new contacts. I've been trying
> to
> go back thru old logs, and get caught up on returning some QSLs...
>
> Seems what I'm hearing is that some do eQSL, some LOTW, others only
> paper...
> Reckon is there any harm in also doing LOTW ? How many do both
> ?
> I'm sure that there are some that don't do either - no great loss I
> guess.
> /;^)
> --
> <- Licensed in 1976, WB5RMG = Alan Sieg * AMSAT#20554 ->
> <- http://www.somenet.net * http://wb5rmg.somenet.net ->
> <- http://www.linkedin.com/in/alansieg * My 'Day Job' ->
>
> _______________________________________________
> 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
>
>
____________________________________________________________
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------------------------------
Message: 15
Date: Tue, 30 Dec 2008 22:05:08 -0800
From: "Art McBride" <kc6uqh@xxx.xxx>
Subject: [amsat-bb] Re: FM receiver filters
To: "'Anthony Monteiro'" <aa2tx@xxxxxxx.xxx>, <G0MRF@xxx.xxx>,
<amsat-bb@xxxxx.xxx>
Message-ID: <18EEFD07B7A7493E9AA02437A9A86739@xxxxxx>
Content-Type: text/plain; charset="us-ascii"
Anthony,
I suggest you consider AFC. Not enough demand for that wide a filter.
Murata makes some 30 KHz 10.7 MHz filters for communication receivers.
Art,
KC6UQH
-----Original Message-----
From: amsat-bb-bounces@xxxxx.xxx [mailto:amsat-bb-bounces@xxxxx.xxxx On
Behalf Of Anthony Monteiro
Sent: Tuesday, December 30, 2008 5:19 PM
To: G0MRF@xxx.xxxx amsat-bb@xxxxx.xxx
Subject: [amsat-bb] Re: FM receiver filters
At 05:41 PM 12/30/2008, G0MRF@xxx.xxx wrote:
>Hi all.
>
>I'm trying to find some 455kHz filters suitable for FM +/- some doppler.
>Ideally, 30kHz wide and fairly small
>
>I have some by Murata. Types BLFYM-455C and BLFCM-455C but these are +/-
>12.5k.
>
>Any ideas? I've checked Digikey, but they only seem to list narrow band
FM
>or AM filters.
>Is there a Murata or Toko distributor that I've missed?
>
>Thanks
>
>David G0MRF
>_______________________________________________
Hi David,
www.Mouser.com carries quite a few of the Murata filters
including this one: CFULA455KB2A-B0
which is spec'd at +/- 15KHz @ -6dB and is US$3.92 in qty 1.
Happy New Year and 73,
Tony AA2TX
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End of AMSAT-BB Digest, Vol 3, Issue 685
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