[amsat-bb] Re: Enhance your Easy Sat Experience!

[Eric Knaps, ON4HF]

And please use full doppler correction. I always have to follow the 
other station going higher in frequency and than come in the middle of 
someone elses qso.
73,
Eric.

Amateur Radio Station ON4HF
Eric Knaps
Satellite manager UBA


http://www.on4hf.be


Op 06/01/2012 13:56, i8cvs schreef:
> Hi Clayton, W5PFG
>
> You have reinvented the wheel ! Since 1972 i.e. 40 years ago
> beginning with OSCAR-6 all of us we were using full-duplex
> capability because in the last century to call a CW or SSB
> CQ without hearin your self and than try to receice for a
> possible answere from someone it was considered a crazy
> procedure.
>
> Full-duplex CW and SSB continued from OSCAR-6 to all
> linear satellites up to AO40 but unfortunately it stopped
> beginning with the FM single channel satellites.
>
> If you actually suggest to enhance the easy FM sat experience
> using full-duplex probably the answere will be that it is too
> complicated and too costly.
>
> 73" de
>
> i8CVS Domenico
>
> ----- Original Message -----
> From: "Clayton Coleman W5PFG"<kayakfishtx at gmail.com>
> To: "AMSAT"<amsat-bb at amsat.org>
> Sent: Friday, January 06, 2012 4:42 AM
> Subject: [amsat-bb] Enhance your Easy Sat Experience!
>
>
> Have you thought about upgrading your station to full-duplex capability?
>
> I realize that many amateurs jump into the satellite fray by utilizing
> an existing handheld radio and an antenna like the Arrow, Elk, or
> tape-measure beam. It's a great way to get your feet wet and make
> that "first" contact via the birds.
>
> Now, let's look at how we can do BETTER.
>
> Full-duplex has a very important purpose in the satellite world. It
> allows you, the ground station, to know that your signal is being
> received and retransmitted by the satellite. I’m not saying it is a
> mandatory but once you see its benefit, you may never want to go
> “semi” again.
>
> How do you really know you are being heard by the bird if you can't
> hear yourself? Answer: You don't.
>
> How do you know another station wasn't already being captured by the
> bird and in the middle of a QSO when you transmit? Answer: You don't.
>
> Let's talk about HOW to do full-duplex. First of all, you don't need
> base-station radios like the Icom IC-9100, IC-910, Kenwood TS-2000, or
> Yaesu FT-847. If you own two handhelds, chances are you have what you
> need!
>
> What you need is at least one radio capable of transmitting on the
> uplink and one radio capable of receiving on the downlink. For
> example using AO-27:
>
> 1. A 2m-only HT, set to the satellite's uplink, ~145.85 MHz.
> 2. A 70cm-only HT, set to the satellite's downlink, ~436.795 MHz.
>
> One added benefit is that while hearing the downlink, you can twist
> your handheld
> antennas (like the Arrow) to match polarity and peak your uplink.
>
> Technically you do not even need a radio capable of transmitting to
> hear yourself on the downlink. A scanner or pocket receiver works
> dandy!
>
> To get into full-duplex inexpensively, there are numerous options.
> You can buy a NEW Baeofeng UV-3R for about $50-60 USD, shipped. This
> radio could serve as an uplink or downlink radio, depending on your
> need. I’m not peddling these radios but using them as an example.
>
> If you have the Arrow with the built-in diplexer, simply bypass it by
> running a patch cord from each radio to the respective UHF and VHF
> beams. If you are running an Elk or tape-measure 2m beam, you will
> need an inexpensive diplexer to give you both 2m and 70cm feed points.
> One can be constructed easily or purchased from numerous vendors for
> $30-80.
>
> Give full-duplex a try. You will not only help the satellite
> community by eliminating unnecessary hetero-dyning tug-of-war, it will
> generally make you sound better on the birds! Oh, and use a pair of
> earphones or a headset when you give it a try to avoid feedback.
>
> 73,
> Clayton
> W5PFG
>
> Here are some more example full-duplex combinations:
>
> Wouxon HT - Downlink
> 2m only-HT - Uplink
>
> FT-60R - Uplink
> Baofeng - Downlink
>
> Handheld scanner - Downlink
> Dual-band HT - Uplink
>
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