[amsat-bb] Re: VHF UHF Rig

Fri Jul 25 14:55:39 PDT 2008

> Is there a radio that is small and lightweight 
> that I could interface to a computer easily to 
> receive and transmit packets to AO-51?  
> I want to use the radio (and the AO-51 pacsat) 
> as the primary means to communicate with an 
> ocean-deployed robot.

Use any of the APRS radios (D7, D70, D710).  They all have 9600
baud TNC's built in... Operate in UI digipeat mode assuming your
command/telemetry is sparse and infrequent and not high volume..

Bob, WB4APR

  Obviously my hand would not
> be there to correct for doppler, etc.
> 
> -andrew
> 
> On Fri, Jul 25, 2008 at 12:55 PM, i8cvs
<domenico.i8cvs at tin.it> wrote:
> > Hi All,
> >
> > My Kenwood TS-790E has absolutely no "birdies" in 2 m ,70 
> cm and 23 cm
> > and this is why I like it very much.
> >
> > Tanks very much the OM that sold it to me as used to buy a 
> new TS-2000X
> > and his "birdies" !
> >
> > 73" de
> >
> > i8CVS Domenico
> >
> > ----- Original Message -----
> > From: "John Price" <n4qwf1 at gmail.com>
> > To: "Andrew Glasbrenner" <glasbrenner at mindspring.com>; 
> <amsat-bb at amsat.org>
> > Sent: Friday, July 25, 2008 4:54 PM
> > Subject: [amsat-bb] Re: VHF UHF Rig
> >
> >
> >> My 847 has a number of birdies in the satellite band. I use
a magic
> >> notch to silence them. It is
> >> not the perfect solution but it works.
> >>
> >> 73's << John
> >>
> >> On Fri, Jul 25, 2008 at 10:32 AM, Andrew Glasbrenner
> >> <glasbrenner at mindspring.com> wrote:
> >> > The TS2000 generates an internal signal (a "birdie") on 
> the downlink of
> >> > SO-50 and AO-27. This signal overwhelms the satellite 
> signal in most
> > cases,
> >> > making it difficult if no impossible to use on those two 
> very popular
> >> > satellites.
> >> >
> >> > 73, Drew KO4MA
> >> >
> >> > ----- Original Message -----
> >> > From: "Terry Dillard" <tdillard at gmail.com>
> >> > To: <AMSAT-BB at amsat.org>
> >> > Sent: Friday, July 25, 2008 9:55 AM
> >> > Subject: [amsat-bb] Re: VHF UHF Rig
> >> >
> >> >
> >> >> Pardon my ignorance, but what the heck is a "birdy
problem"?
> >> >>
> >> >> --
> >> >> Terry Dillard, KI4YZI
> >> >> www.ki4yzi.com
> >> >> "Veritas Vos Liberabit"
> >> >>
> >> >>
> >> >> On 7/24/08, Sebastian <w4as at bellsouth.net> wrote:
> >> >>>
> >> >>> Oh boy, and here I just bought a used dual band mobile 
> on the cheap
> >> >>> (no transmit) to take care of the birdy problem.
> >> >>>
> >> >>> Do you have any idea why the birdy would show up on a
different
> >> >>> radio?  Could it be a matter of a lack of shielding?  
> It just doesn't
> >> >>> make any sense to me why a different rig would get 
> that interference
> >> >>> on receive, and even when using a different antenna.
> >> >>>
> >> >>> Others have suggested using a preamp on 440, and 
> turning off the
> >> >>> 2000's internal preamp and lowering the rf gain, 
> therefore using the
> >> >>> preamp to get rid of most of the birdy.
> >> >>>
> >> >>> But I guess I'll find out for sure when my other rig
gets here.
> >> >>>
> >> >>> 73 de W4AS
> >> >>> Sebastian
> >> >>>
> >> >>> On Jul 24, 2008, at 7:00 PM, Bruce Robertson wrote:
> >> >>>
> >> >>> > On Wed, Jul 23, 2008 at 11:31 PM, Mike Miller 
> <mmiller at nctc.com>
> >> >>> > wrote:
> >> >>> >> Thinking about selling 847.....Which rig is best for
> >> >>> >> satellite..work.?
> >> >>> >>
> >> >>> >> ICOM 910 H
> >> >>> >> Kenwood 2000
> >> >>> >>
> >> >>> >> opinions ....your 2 cents
> >> >>> >
> >> >>> > I own a TS-2000. The birdie problem on SO-50 and 
> AO-27 is quite
> > real,
> >> >>> > and there is no fix I know of. I find that the 
> birdie is so bad that
> >> >>> > even if I use a different receiver on UHF, I pick up 
> the birdie on
> > it
> >> >>> > as well! So it is a worse radio regarding satellite 
> work than the
> > ICOM
> >> >>> > if you care to work these birds.  However, if you 
> consider the fact
> >> >>> > that a fine HF radio is thrown in at no extra cost, 
> that there is
> >> >>> > continuously adjustable filtering also at no cost, 
> you might prefer
> >> >>> > that trade-off. I'm reasonably pleased with mine.
> >> >>> >
> >> >>> > However, if money were no issue, I would get the 
> ICOM for satellite
> >> >>> > work and a different HF radio with even better 
> characteristics.
> >> >>> >
> >> >>> > HTH,
> >> >>> >
> >> >>> > 73, Bruce
> >> >>> > VE9QRP
> >> >>>
> >> >> _______________________________________________
> >> >> Sent via AMSAT-BB at amsat.org. Opinions expressed are
those of the
> > author.
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> >> >
> >> > _______________________________________________
> >> > 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
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> >> >
> >>
> >>
> >>
> >> --
> >> N4QWF Amateur Radio Operator
> >> AO-7,AO-27,SO-50,AO-51,VO-52,ISS
> >> Internet N4QWF at AMSAT.ORG
> >> Echolink nodes #110903 -L #388463
> >> Formerly KC4AHW VK3FEZ
> >> Amsat Member #27845
> >> DXCC #33,478
> >> VUCC SAT #135
> >> WAS SAT #296
> >> 51 on AO-51 #13
> >> LON -79.256 LAT 37.459 Grid FM07il
> >> >From the Foothills of the Blueridge
> >>
> >> *Life should not be a journey to the grave with the
intention of
> >> arriving safely in a pretty and well preserved body, but
rather to
> >> skid in broadside, thoroughly used up, totally worn out,
and loudly
> >> proclaiming - "WOW, What a ride!"
> >> _______________________________________________
> >> 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!
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> >>
> >
> >
> > _______________________________________________
> > 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 
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> >
> _______________________________________________
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> 