[amsat-bb] Re: VHF UHF Rig

Sun Jul 27 13:35:18 PDT 2008

> Thanks for the info.  I actually own a Kenwood 
> TH-D7.  Is that what you're referring to?  
> I was under the impression that the TNC on the
> TH-D7 is permanently crippled and I couldn't 
> use it to effectively communicate in both 
> directions to a pacsat.

Its all in the Details.....

The TH-D7 TNC works perfectly well... For what it was designed
to do... That is APRS, or other UI packets.  The only thing it
has problems with is CONNECTED mode, handing lots of data, at
high throughput, in KISS mode at 9600 baud.  IE, using it for
classical PACSAT mode. 

But on the other hand, you can use it to digipeat through the
PACSAT all the time with no problems whatsoever.  This is APRS
mode, single packet at a time, digipeat using UI packets at 9600
baud.  Which, by the way, are more efficient in the task you are
proposing anyway...

Good luck.  Bob, WB4APR

> 
> -andrew
> 
> On Fri, Jul 25, 2008 at 5:55 PM, Robert Bruninga 
> <bruninga at usna.edu> wrote:
> >> 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.
> >> >> >> Not an AMSAT-NA member? Join now to support the
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> >> > 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
> > satellite
> >> > program!
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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
> >> 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
> >> satellite program!
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> >>
> >
> >
> 