[nrv-hams] Ugly intermod

[Mike Harris]

Russ,

         You hear multiple ID's because we have them linked on the 
actual channels and not on another frequency upstream of the 
controllers.  The 2M repeater is just listening to the 440 like it 
was a second receiver so when the 440 ID's it gets re-broadcasted on 
2M and vice versa. So 2M sends it's ID like normal and then it 
'hears' the 440 ID and just repeats it.

         If you listen close you can tell the difference in the time 
stamps.  The clocks are about 10 seconds apart and the .18 will ID 
first in 12 hour format and the 440 will ID second in 24 Hour format.

         For the rest of the group I sent this to Len this morning:

The intermod is on the input to the 440 machine.  I was worried that 
it would be a problem when I put a pre-amp on it with that little 
duplexer. (Notch cavity)  Problem is that if I remove the pre-amp the 
regency receiver is pretty much deaf (.6 uV).

Somewhere I have a 460 bandpass cavity set so I will try to find them 
over the next couple weeks and see if I can tune it up and move it to 
440.  That should help.

The noise is there a lot more than we hear but the CTCSS has it 
blocked most of the time.  What is getting through has enough energy 
to blast past the decoder and open the receiver.


Mike Harris
KA4EPD





At 12:15 PM 12/17/2012, you wrote:
>Just a note here, I have been hearing 3 and 4 ID's at a time coming thru
>the links.  I don't understand why?  But am very interested in the outcome
>due to Floyd's soon to be linked 2 meter and 440 repeaters.  We also have
>the CAT-1000 on the 2 meter and a CAT 200b on the 440.  Good thread on this
>though, I have enjoyed the give and take on what might be wrong.
>Russ, KG4MAV
>
>On Mon, Dec 17, 2012 at 7:05 AM, Robert McGwier <rwmcgwier at gmail.com> wrote:
>
> > I want to point out that I haven't heard the intermod since the two meter
> > repeater went off the air.  I've been thinking the link is the likely
> > culprit given the complete escape and bypass of the PL interference
> > suppression system, I wonder if we can just suspend the link after the two
> > meter repeater is back on the air to test this hypothesis?
> >
> > Bob
> >
> >
> >
> > On Sun, Dec 16, 2012 at 3:27 PM, Robert McGwier <rwmcgwier at gmail.com>
> > wrote:
> >
> > > I think there is some ugly intermod keying the 70 cm repeater.  Don't
> > > know why PL isn't stopping it, but there you go.
> > >
> > > --
> > > Bob McGwier
> > > Owner and Technical Director, Allied Communication, LLC
> > > Facebook: N4HYBob
> > > ARS: N4HY
> > >
> > >
> >
> >
> > --
> > Bob McGwier
> > Owner and Technical Director, Allied Communication, LLC
> > Facebook: N4HYBob
> > ARS: N4HY
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