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RE: Re: TH-D7 Deficiencies



No, the TH-D7 does not allow you to store odd splits.  Even if it did, you
would not be able to do full duplex this way because you would be using a
single band and the frequency would change as soon as you hit the PTT button
so you wouldn't have the receive frequency selected anymore.  I can't
imagine any radio would technically be able to do full duplex on a single
band using an odd split.  Somebody correct me if I'm wrong. ;-)  I think the
ability to "link" the two bands is the feature you are looking for.

I use a TH-D7 for my LEO work and it works fine for me.  Some say it is
tedious to switch between bands to change for doppler and then switch back
to transmit, but it hasn't really gotten in my way much.  It's just one more
button press - no big deal.  Maybe I'm just used to it.  I know there are
radios out there that are "easier" to use for satellite work, but this
"deficiency" isn't a show stopper in my book especially when you consider
everything else the TH-D7 has to offer.

73!

A.J. Farmer, AJ3U
http://www.aj3u.com



-----Original Message-----
From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org] On Behalf
Of Wallace Strom
Sent: Monday, July 12, 2004 7:17 PM
Cc: amsat-bb@AMSAT.Org
Subject: Re: [amsat-bb] Re: TH-D7 Deficiencies


I am thinking about buying a TH-D7  and have been reading the manual.

Can the satellite frequencies be stored as odd-splits?  ( pg 27 of the
manual)
Will full duplex still work ?

73
Wally
kg4yuw

"A.J. Farmer" wrote:

> I use two memory slots for each satellite.  One for the uplink, one for
the
> downlink.  When I want to work a bird, I copy the downlink memory slot
into
> the VFO (F -> VFO) so that I can change it to adjust for doppler.  I do
not
> change the uplink frequency like Bob said since the 2m uplink doesn't have
> much of a doppler shift.  The 440 downlink is what you need to worry
about.
>
> 73!
>
> A.J. Farmer, AJ3U
> http://www.aj3u.com
>
> -----Original Message-----
> From: owner-AMSAT-BB@AMSAT.Org [mailto:owner-AMSAT-BB@AMSAT.Org] On Behalf
> Of Robert Bruninga
> Sent: Monday, July 12, 2004 8:57 AM
> To: w8aas@comcast.net
> Cc: amsat-bb@AMSAT.Org
> Subject: [amsat-bb] Re: TH-D7 Deficiencies
>
> >>> Dave Taylor <w8aas@comcast.net> 7/10/04 7:45:41 PM >>>
> > What I do is program the Doppler frequencies for uplink
> >and downlink separately.  It works, but has two drawbacks:
> >
> > - It uses 10 memories instead of 5.
> > - It increases the workload during a pass,
> >   because you have to change two channels and switch
> >   bands twice for each doppler change.
>
> But there is no reason to do that.  The 2m uplink only has a
> peak doppler of 2500 Hz above say 5 deg elevation
> and so there is no reason to tune the uplink for a handheld.
> Below 5 deg elevation, most handheld operators are never
> going to be able to see the bird and if they do, the bird
> is 6 dB further away than it is at 25 deg, and the chance that
> their 5W could be heard anyway is quite small...
>
> Dont bother with uplink tuning.  ALso, the Satelite RX is
> broaderband than terrestrial receivers to allow for being
> 2.5 KHz off and still be in the passband...
>
> de Wb4APR, Bob
> ----
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> ----
> Sent via amsat-bb@amsat.org. Opinions expressed are those of the author.
> Not an AMSAT member? Join now to support the amateur satellite program!
> To unsubscribe, send "unsubscribe amsat-bb" to Majordomo@amsat.org
----
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----
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