Steve,
The single most important step in mitigating fugitive LO emissions is
ensuring that all shields are in place and properly seated, and all
screws are in place and tight. Anyone who has had LO leakage with
Micors knows that you can't leave out any shields, and the same
precaution applies to Mitreks and almost any other brand or model.
If the shields are in place and the covers are tightly fitted, then
adding ferrite filter cores on the power and control leads may help.
The fact that your Mitrek has been modified suggests that the mods may
be at the heart of the problem. I'd look first at any DC control leads
that enter or are near the LO, and apply ferrite chokes or feedthrough
capacitor filters as appropriate.
73, Eric Lemmon WB6FLY
[EMAIL PROTECTED] wrote:
>
> Hi,
>
> I have a modified UHF mitrek mobile in repeater service which is emitting a
> strong signal at 1/3 of the LO mixer injection frequency. Before I travel to
> the site which is over 300 miles away, I'd like to make a list of things to
> check when I get there. I know the preselector can be problematic, as well as
> the channel elements themselves.
>
> What have the lest members tried with success to mitigate the LO radiation
> from Mitrek mobiles?
>
> I know that this radio should have have the preselector cold-end helical
> coils resoldered. A Cactus technical article mentions this should be done
> with silver solder.
> Does anyone know why silver solder is preferred?
>
> Steve
> WA6ZFT
>
>
>
>
> Yahoo! Groups Links
>
>
>
>
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