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Re: 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.
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----
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