> Identical IF's in the same chassis area can
> be a problem ... unless everything is very
> well shielded *and* all interconnected
> wiring is fully filtered ... even then may not
> be sufficient.
Very true
> This is the reason the radio equipment
> manufacturers use a shifted IF on the
> second receiver in such systems.
Actually, only one reason of many
> The Mitrek / MSR2000 systems use a 10.8 MHz
> Shifted IF ... for more details, see
There can be co-equipment, receiver image or
local signals, which require an IF Shift or
change to high side injection.
Two stories come to mind, one was a large mix
birdie. The other is a high powered non radio,
industrial equipment oscillator on 10.7MHz
Both had nothing to do with co-located same
IF frequency radios.
If you "flip" the injection chain to the high side,
understand that any digital (dpl or data) word
information will be "inverted" at the discriminator
output.
cheers,
skipp
skipp025 at yahoo.com
www.radiowrench.com
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