[Elecraft] K3 and Icom PW-1

[Joe Subich, W4TV]

One correction ...=20

I misread the MC14028 spec sheet.  There is no "none of the above"=20
output from the 14028.  To include 6 meters, it will be necessary=20
to add a separate decoder for BCD 10 ... not difficult but just=20
one more step.=20

73,=20

   ... Joe, W4TV=20
 =20




> -----Original Message-----
> From: elecraft-bounces at mailman.qth.net=20
> [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Joe=20
> Subich, W4TV
> Sent: Monday, June 02, 2008 4:33 PM
> To: 'Jerry Flanders'; elecraft at mailman.qth.net
> Subject: RE: [Elecraft] K3 and Icom PW-1
>=20
>=20
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> > IIRC, this method only works for the major bands. ICOM did not=20
> > provide for the others.
>=20
> Actually, my design uses a resistive divider network - with standard=20
> 2% resistors - that takes +12V (regulated for reliability)=20
> and provides=20
> the proper voltage for all bands 160 - 6 M based on which tap is=20
> grounded.  It is a bit different than the Top Ten approach which=20
> uses individual trimmers to set the output voltage for each "band"=20
> and source drivers that have been discontinued.  Note - Icom uses=20
> the same voltage for 17/15 and 12/10 so it requires 8 outputs to=20
> cover 160, 80, 40, 30, 20, 15/17, 12/10, and 6m.  The decoder does=20
> not directly decode 6 meters (BCD 10) but the circuit can be=20
> configured to select 6 as a "none of the above" case (BCD 0) or=20
> a dedicated 6 M circuit could be added to the basic decoder.  =20
>=20
> I have been asked off-line if I would be willing to offer and=20
> interface - either complete or as a mini-kit.  I have no interest=20
> in building a complete product "by hand" and the cost of a small=20
> run in Europe is currently prohibitive.  However, I'll ask here=20
> one time only ... how much interest would there be in a kit? =20
> Should a kit include a case or are users likely to incorporate=20
> it in  another piece of equipment? =20
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> Responses direct only ...  =20
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> 73,=20
>=20
>    ... Joe, W4TV=20
> =20
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> > -----Original Message-----
> > From: elecraft-bounces at mailman.qth.net=20
> > [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of=20
> Jerry Flanders
> > Sent: Monday, June 02, 2008 1:48 PM
> > To: elecraft at mailman.qth.net
> > Subject: RE: [Elecraft] K3 and Icom PW-1
> >=20
> >=20
> > IIRC, this method only works for the major bands. ICOM did not=20
> > provide for the others.
> >=20
> > Jerry W4UK
> >=20
> > At 01:42 PM 6/2/2008, Dick Dievendorff wrote:
> > >See also Top Ten Devices application note #3,
> > >http://www.qth.com/topten/apnote3.htm
> > >
> > >Unfortunately the schematic doesn't seem to show up (on my=20
> > browser), but
> > >I've seen the schematic before.  It's the BCD to voltage=20
> > divider network
> > >(with trimmer pots) that Joe mentions below.
> > >
> > >The schematic was once at=20
> > http://www.qth.com/topten/icomencd.gif but the
> > >file doesn't seem to be there now.
> > >
> > >I'll forward this to Dave Hawes of Top Ten Devices; maybe he=20
> > can get the
> > >image file restored.
> > >
> > >73 de Dick, K6KR
> > >
> > >
> > >-----Original Message-----
> > >From: elecraft-bounces at mailman.qth.net
> > >[mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Joe=20
> > Subich, W4TV
> > >Sent: Monday, June 02, 2008 9:30 AM
> > >To: 'Bob Serwy'; elecraft at mailman.qth.net
> > >Subject: RE: [Elecraft] K3 and Icom PW-1
> > >
> > >
> > >Bob,
> > >
> > >There are two approaches that will work to do automatic
> > >band switching with the K3 and PW-1.  The first is to use
> > >something like the microHAM Band Decoder (or new Station
> > >Master which replaces Band Decoder) to convert the Elecraft
> > >(Kenwood) "IF;" CAT data to Icom CI-V Transceive broadcasts.
> > >The second would be to build a BCD to 1 of 10 decoder and
> > >use that to drive a voltage divider to create the Icom
> > >compatible "Band Select" voltage.
> > >
> > >The Station Master will be available off the shelf after
> > >Friedrichshafen.  I can supply notes on the BCD decoder
> > >approach but have not built/tested any devices.  That is a
> > >"low tech" solution and not something microHAM is likely to
> > >produce and I'm not inclined to get involved in building "one
> > >off" units since that is a relatively high cost/low return
> > >proposition.
> > >
> > >73,
> > >
> > >    ... Joe, W4TV
> > >
> > >
> > >
> > > > -----Original Message-----
> > > > From: elecraft-bounces at mailman.qth.net
> > > > [mailto:elecraft-bounces at mailman.qth.net] On Behalf Of Bob Serwy
> > > > Sent: Monday, June 02, 2008 11:24 AM
> > > > To: elecraft at mailman.qth.net
> > > > Subject: [Elecraft] K3 and Icom PW-1
> > > >
> > > >
> > > > Any one has a K3 and a PW-1 hooked up for automatic band
> > > > switching of the PW-1?  If so, how as it accomplished?
> > > >
> > > > Thanks
> > > >
> > > > Bob Serwy - N9RS
> >=20