[Elecraft] K3 and Icom PW-1

[Joe Subich, W4TV]

> IIRC, this method only works for the major bands. ICOM did not=20
> provide for the others.

Actually, my design uses a resistive divider network - with standard=20
2% resistors - that takes +12V (regulated for reliability) 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

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

Responses direct only ...  =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 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
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