What you need is a 16 line to 4 line encoder. Just off the top of my head,
this would take a pair of MC14532 cmos encoders configured to a 4 bit output
using a 5 volt supply. The output of the Yaesu band data is 0 to 5 volts
approx. binary coded decimal and so that must be what is needed at the input
of the 7000 (I once made a Yaesu 990 to Herc band decoder and had to convert
the 5 volt BCD logic to 12 volt one of sixteen line to drive the Herc). So
what is the output of the Orion...12 volts I guess...like the Omni VI+? Then
you will have to simply attenuate the outputs of the Orion so as to not
exceed the 5 volt supply voltage on the MC14532 inputs. The input current of
the encoders is less than a microamp so I would use the following ckt. Each
output of the Orion to a 68K resistor the other end of which goes to a 33K
which is across the input of each encoder input to gnd. And probably a
.001uF across each 33K would be good. The encoders are capable of sourcing
or sinking a milliamp so if the input impedance of the 7000 is less than say
20K, then a buffer amp like an MC14050 should be put between the encoder
outputs and the 7000.
I realize this is all old cmos. There are dozens of ways to do this so have
at it. But, basically this is what it takes.
Chuck, KE9UW
> -----Original Message-----
> From: tentec-bounces@contesting.com
> [mailto:tentec-bounces@contesting.com]On Behalf Of Greg Hodsdon
> Sent: Tuesday, May 18, 2004 15:54 PM
> To: tentec@contesting.com
> Subject: Re: [TenTec] Yaesu FL-7000 to Orion
>
>
> I don't believe it's going to be quite that easy.
> The TopTen decoder either sinks or (with a simple mod)
> sources 12 vdc to a particular output pin depending on
> the input signal. You need to confirm exactly what type
> of band input the Yaesu amp requires. I think it's looking
> for a logic signal, in which case the band decoder won't
> work directly. See the decoder schematic at:
> http://www.qth.com/topten/bd-o_sch.pdf
>
> 73 de Greg, K7KJ
>
> Greg Hodsdon
> Portland, OR
> k7kj@arrl.net
> http://www.qsl.net/k7kj
> ----- Original Message -----
> From: "NJ0IP" <Rick@dj0ip.de>
> To: <tentec@contesting.com>
> Sent: Tuesday, May 18, 2004 10:14 PM
> Subject: RE: [TenTec] Yaesu FL-7000 to Orion
>
>
> > Here is a product ready-made for that task:
> >
> > http://www.qth.com/topten/bdecoder.htm
> >
> > 73
> > Rick
> >
> >
> > -----Original Message-----
> > From: tentec-bounces@contesting.com
> > [mailto:tentec-bounces@contesting.com]On Behalf Of Bob Henderson
> > Sent: Tuesday, May 18, 2004 11:39 AM
> > To: tentec@contesting.com
> > Subject: Re: [TenTec] Yaesu FL-7000 to Orion
> >
> >
> > Don
> >
> > Not quite.......to interface the Orion to the FL7000 for auto
> > band
> > change you will require some logic to make the interfaces
> > compatible.
> > This will take the form of a 16 to 4 line encoder of some type.
> > Definately not just a cable. If you are not familiar with binary
> > logic
> > yourself you'll need to enlist the help of someone local to you
> > who is.
> >
> > I hope I've clarified that for you.
> >
> > 73 Bob, 5B4AGN
> >
> > Don wrote:
> >
> > >Bob
> > >
> > >
> > >"It is possible to auto band change the FL7000 or other Yaesu
> > amp from
> > >the Orion but not without an encoder to produce compatible band
> > data.
> > >
> > >Yaesu provide binary parallel band data from their radios and
> > that is
> > >what the FL7000 uses for auto band switching."
> > >
> > >So if I understand this correctly to "auto" band switch all I
> > should have to do
> > >is make up the cable? Just want to confirm that I am reading
> > correctly.
> > >
> > >thanks
> > >
> > >Don kd6hq
>
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