Just back from IWCE Vegas... cough! cough!
(the cig smoke just kills you...)
Met up with some of my Engineering Friends
at/from Sinclair.
One interesting story was about an attempt to deal
with a 17th order product, which was not resolved.
Sometimes you just can't win...
cheers,
skipp
[Now setting up on the ILS markers for Dayton!]
PS: Saw and said hello to Richard from Brocomm,
he's got lots of Quantars and MSR's left.
> Kevin Custer <[EMAIL PROTECTED]> wrote:
> I disagree, because he says it happens only when things are linked.
>
> I would think it has something to do with the link transmitter
> intermoding the repeater receiver, or the repeater transmitter
> intermoding the link receiver. He doesn't elaborate enough on when
it
> happens, like after the linked repeater drops, or just when, but I
don't
> believe it's a problem with the repeaters.
>
> Dennis, Your statement of " When the link is up and someone uses
the
> 146.700/R it creates terrible interference and you can actually
> understand what is being said on the 70/R. The 70/R will not be
heard
> or cause a problem until the 97/R is accessed while linked to the
> 147.24/R." is too vague and seems incorrect. If the two repeaters
are
> linked, you should be able to understand what is being said on
either
> machine, so I'm wondering what you are actually experiencing?
>
> At any rate, a notch cavity on the remote base tuned to the
repeater
> transmit frequency, placed in the remote base line will help or
> eliminate intermod of the remote base. A notch cavity tuned for
the
> remote base transmitter frequency, placed in the repeater receiver
line
> will help or eliminate intermod of the repeater receiver.
>
> I don't have the time to run the numbers, so maybe you could run
them
> again Eric?
>
> Kevin Custer
>
> Eric Lemmon wrote:
>
> >Dennis,
> >
> >You have classic third-order intermodulation interference. 146.970
times 2
> >= 293.940 MHz. Subtract the 146.700 signal and you have 293.940 -
146.700
> >= 147.240 MHz, the output of your linked repeater. Other mixing
products
> >are possible. I suspect that neither the 146.970 repeater nor the
146.700
> >repeater has a circulator on the output. Bandpass cavities on the
output
> >are another option.
> >
> >73, Eric Lemmon WB6FLY
> >
> >ki5fw wrote:
> >
> >
> >
> >>Hey Guys;
> >>Why does my 146.970/Rptr when linked to a 147.240/Rptr get
interference
> >>from a 146.700/Rptr. The 146.700/R is about 5-7 miles from my
> >>146.970/R. When the link is up and someone uses the 146.700/R it
> >>creates terrible interference and you can actually understand
what is
> >>being said on the 70/R.
> >> The 70/R will not be heard or cause a problem until the 97/R is
> >>accessed while linked to the 147.24/R. There is no problems when
the
> >>link is down.
> >>Will a notch filter on the remote base T/cvr to notch out 146.700
be
> >>the cure? The remote base is frequency agile and wonder if the
notch
> >>filter is the way to go. Guess it depends on how wide and deep the
> >>notch is???
> >>I tried the intermod Calculator and I think I see what the
problem is,
> >>but not sure if I'm looking at it correctly.
> >>
> >>TNX in Advance,
> >>Dennis ki5fw
> >>
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