[arm-allstar] COS on older VHF radio

[Doug Crompton]

Rachid,

See this link -

http://www.iw2nmx.it/Yaesu/FT-290R%20MkII/FT-290RII%20Instruction%20Manual.pdf

Go to the last pages - schematics. Look for the option unit.  Last
schematic upper left P01  - This is where the tone unit plugs in. One of
those pins or a point on the tone board will go true (hi or low) with tone
input. It looks like it could be the rx out pin.  It might need to be
buffered with a FET which would be the best way to do it. The FET would
output would toggle the COS line.


*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*


*73 Doug*

*WA3DSP*

*http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>*





On Tue, Apr 30, 2019 at 12:19 AM "Rachid Karroo via ARM-allstar" <
arm-allstar at hamvoip.org> wrote:

> I have checked and the LED remains on when the squelch is opened in any
> mode (FM, SSB, CW). I will probe around that area. The rig is the 290 RII
> from Yaesu
>
> Rachid
> 3B8FP
>
> On Mon, Apr 29, 2019 at 5:45 PM "Mike Besemer - WM4B via ARM-allstar" <
> arm-allstar at hamvoip.org> wrote:
>
> > Looking deeper, that may not work since the LED flickers on voice peaks
> > on TX (although I'm not sure if it does that in FM mode or only in SSB).
> > Try poking around the Collector of Q3021 and see what you see.
> >
> > Mike
> > WM4B
> >
> >
> > On Mon, Apr 29, 2019 at 7:16 AM, "Mike Besemer - WM4B via ARM-allstar"
> > wrote:
> >
> > > On the CPU Unit J01 Pin 9 (mates with Control Unit J02 Pin 9) there is
> > > a signal called 'Busy/Mod'.  It appears to be an active low.  I'd
> > > probe that point and see if it switches state while opening/closing
> > > the squelch.
> > >
> > > Mike
> > > WM4B
> > >
> > >
> > > On Mon, Apr 29, 2019 at 3:05 AM, "Rachid Karroo via ARM-allstar"
> > > wrote:
> > >
> > >> I have an old Yaesu FT 290R II and am planning to use it on another
> > >> ASL
> > >> node.
> > >> It has a Mic, PTT, Ground and Audio out in the 8 pin microphone plug.
> > >>
> > >> I am planning to modify a USB sound FOB for it.
> > >>
> > >> Any suggestions please?
> > >>
> > >> 73's
> > >>
> > >> Rachid
> > >> 3B8FP
> > >> Node 40248
> > >> _______________________________________________
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> > >>
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> >
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