At 1/11/2005 12:02 PM, you wrote:
>Might have misexplained it actually, the user has a Kenwood Radio that has
>been played with prior to him getting the radio, had the deviation turned
>way up, when he transmits on the 146.910 repeater to their input of 146.310,
>he clips into my receiver at 146.325 causing the repeater to key up several
>times during his conversation when he speaks loud into the microphone.
Oh, OK I got it now.
> I
>even offered to adjust his radio for him, says he would like that, but won't
>make the attempt to bring it here to get it done.
Go to his house. Buy him a beer. Etc. Yes it's more of a pain/expense,
but cheap in the long run if it solves the problem.
Some of the newer radios (maybe not so new if you consider the Yaesu
FT-8500 "new") provide for deviation adjustment via a service menu, so in
those cases you don't even have to pop the radio open. Then again, maybe
that's how this particular radio got "played with".
> Just was hoping to
>eliminate it on this end, which I had with the Mastr receiver until I
>installed the preamp, then he came back, but the suggestion of using a pad
>might do the trick. He generally gets on early afternoon, so once he begins
>his transmissions, I will put the attenuator inline and see how far down I
>have to go to get rid of him then check receiver performance from that
>point.
I suspect you will lose effective sensitivity. Adjacent-channel
interference (ACI) & on-channel noise will track together as attenuation is
increased until the latter disappears into the RX front-end noise. At that
point you'll probably see the ACI begin to fall but your effective
sensitivity will degrade too.
If you're not that concerned about how much his signal is degrading your
input but don't like the keyups, consider CTCSS access, or run a tight
carrier squelch & use "CTCSS OR COS" squelch (input access mode '4' in
LinkComm, S-Com & MP100 controllers) so weak users equipped with CTCSS can
still get in yet strong users still won't need CTCSS.
Bob NO6B
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