[TenTec] Omni C - No TX

[Mike Hyder -N4NT-]

Yep, Garland hung the moon. . .

Mike N4NT

----- Original Message -----
From: "Jeff Stewart" <stewgoat at indy.net>
To: <tentec at contesting.com>
Sent: Saturday, April 26, 2003 4:25 AM
Subject: Re: [TenTec] Omni C - No TX


>     Thanks to Mike, Jerry and of course Garland Jenkins at Ten Tec I fixed
> my Model 280 supply with 2 used J802 pass transistors I had on hand.
> Everyone's contribution is much appreciated.  The J802 is a cross to the
> original 2N5301's.  Thanks for the help guys and as for Garland; what a
> customer service rep for Ten Tec.
>
> 73,
> Jeff
> ----- Original Message -----
> From: "Mike Hyder -N4NT-" <N4NT_Mike.Hyder at charter.net>
> To: <tentec at contesting.com>
> Sent: Tuesday, April 22, 2003 3:53 AM
> Subject: Re: [TenTec] Omni C - No TX
>
>
> > Jerry, the trouble wouldn't be with the current protection, but is
> probably
> > with the crowbar (overvoltage protection) that is blowing the fuse.  One
> of
> > the pass transistors may be shorted, putting too much voltage across the
> > output.  The crowbar clamps it down and blows the fuse when this
happens.
> >
> > 73, Mike N4NT
> >
> > ----- Original Message -----
> > From: "Jeff Stewart" <stewgoat at indy.net>
> > To: <tentec at contesting.com>
> > Sent: Tuesday, April 22, 2003 2:00 AM
> > Subject: Re: [TenTec] Omni C - No TX
> >
> >
> > >     Thanks to Jerry I found the 20 amp fuse in the supply blown but
the
> > > replacement fuse blew also.  Unhooked the supply from the rig and
> jumpered
> > > the switch lead that goes from the supply normally to the radio and
the
> > fuse
> > > still blows without the radio attached.  Now I could use the schematic
> for
> > > the supply to figure out how the current protection works.  At least I
> > have
> > > it narrowed to the supply and not the radio at fault for the blown
fuse.
> > >
> > > Jeff
> > > ----- Original Message -----
> > > From: "JERRY JUDY" <ke8npjmj at ameritech.net>
> > > To: <tentec at contesting.com>
> > > Sent: Monday, April 21, 2003 9:45 AM
> > > Subject: Re: [TenTec] Omni C - No TX
> > >
> > >
> > > > Inside the ps is a 20 amp fuse on the ps circuit board. I would bet
> that
> > > > fuse is blown.  This condition lets the recieve work but high
current
> of
> > > > xmit is gone. Let me know if I am right?   KE8NP
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > >
> > > > ----- Original Message -----
> > > > From: "Jeff Stewart" <stewgoat at indy.net>
> > > > To: <tentec at contesting.com>
> > > > Sent: Sunday, April 20, 2003 10:36 PM
> > > > Subject: [TenTec] Omni C - No TX
> > > >
> > > >
> > > >     While adjusting my MFJ antenna tuner, my Omni C kicked out of
> > transmit
> > > > (too high an SWR I assume).  In the past, just shutting the rig down
> > then
> > > > powering up would reset it.  Now every time I key the mic or use the
> > lock
> > > > position, it shuts down but will return to receive when unkeyed.
The
> > Omni
> > > > and the 280 power supply both turn off on transmit but works fine in
> > > > receive.  Both the fuse on the power supply and the radio check fine
> > with
> > > an
> > > > ohm meter.  What have I blown? ( I do have the owner's manual but I
> > > there's
> > > > no troubleshooting section.
> > > >
> > > > Thanks,
> > > > Jeff