Hi,
My guess is that there is a bad DC blocking cap either in the exciter or
the controller.
Best advice is to talk to Pete at NHRC, he knows the hardware a lot
better than I do. Those guys say all I do is "typing..."
Jeff
At 04:10 PM 11/25/2004, you wrote:
>Jeff, I have a Mastr II station. A NHRC 3+ as the controller and
>your DAD board. In the audio chain I'm also using a GE channel guard
>board. The 3+, DAD board and CG board are in the same enclosure with
>feed thru caps. I have disconnected the receiver and left the Pll
>exciter audio hooked up. When I ground the PTT line no audio comes
>thru except crackling and static, and it comes and goes. The PA is
>not in line, the exciter is running alone into a dummy load. I've
>tapped and wiggled all components and I can not find a spot where I
>can get it to stop or start. I hope I've covered everything.
>
>Happy Thanksgiving to you and the group also....Jim km0k
>
>
>
>--- In Repeater-Builder@yahoogroups.com, Jeff Otterson
><[EMAIL PROTECTED]> wrote:
> > Yes, possibly a bad capacitor anywhere in the audio chain.
> >
> > What else do you have connected up? A receiver?
> >
> > Happy Thanksgiving!
> >
> > Jeff
> >
> >
> >
> >
> >
> > At 11:09 AM 11/25/2004, you wrote:
> >
> >
> > >--- In Repeater-Builder@yahoogroups.com, Jeff Otterson
> > ><[EMAIL PROTECTED]> wrote:
> > >Jeff, I disconnected the audio line to the exciter. NO Noise, so
> > >then I disconnected the audio from the Rx. The noise was still
> > >there. The only thing left is the NRHC 3+ controller. What would
> > >generate noise there, Bad Cap? What should I look for? Tnx...Jim
> > >
> > >
> > > > Bad capacitor in the audio stage?
> > > >
> > > > Jeff
> > > >
> > > > At 09:39 AM 11/25/2004, you wrote:
> > > >
> > > >
> > > > >Hi group!
> > > > >I have a vhf pll exciter that is very noisy, by that I mean
> > >scratchy
> > > > >sounds on the carrier. When I unplug the PA and run the
>exciter
> > > > >alone with no audio into a dummy load I get this noise, so I
>know
> > >it
> > > > >is coming from
> > > > >the exciter. I cleaned all the contacts that the audio and
> > >bandpass
> > > > >boards plug into and also the edge connecter plug, ICOM etc.
> > >Touched
> > > > >all posts with a touch of new solder, but still have it.
> > > > >I even swapped audio and bandpass boards to no avail. So I
> > >replaced
> > > > >it with another exciter, and this one is a
> > > > >lot quieter. What would cause this exciter to generate noise?
>I
> > > > >modified the Band Pass Filter from G2 to a G1 and replaced the
> > > > >aluminum slug with a ferrite one. I would like to fix this
>one if
> > >I
> > > > >can as they are hard to come by. Is there any suggestions
>where I
> > > > >should start looking? Has anyone else had this problem?
>Thanks in
> > > > >advance.
> > > > >
> > > > >Jim KMØK
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >
> > > > >Yahoo! Groups Links
> > > > >
> > > > >
> > > > >
> > > > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >Yahoo! Groups Links
> > >
> > >
> > >
> > >
>
>
>
>
>
>
>
>
>Yahoo! Groups Links
>
>
>
>
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