At 1/10/2005 04:00 PM, you wrote:
>Thanks Bob,
>
>The receiver is the Mastr ER41 series receiver.
My experience has been that the IFs in those receivers are a bit wide. The
one I have in the garage has a 5.3 MHz 1st IF, so finding a narrower filter
for it is probably next to impossible. They do use a 455 kHz 2nd IF, so in
theory there should be a way to graft in a CFW455G 6-pole filter, but I've
never done it. If I were to try, I'd scrap the entire detector board &
replace it with an MC3359 IF on-a-chip & M6709 or M7716 Micor squelch IC.
In your case it's probably easier to go with a Mastr II RX. They have 10
poles of IF filtering & are ~37 dB down @ +/- 10 kHz. If that's not narrow
enough you can replace some or all of the IF filters with the 12.5 kHz G.E.
IF filters from Com-Spec (<www.com-spec.com>).
> My receive is at 146.925
>and the other repeater that is about 50 miles away receives at 146.310.
This is good. If all repeater TXs & RXs are good & properly adjusted there
should be no problem. 9 kHz seems awfuly high; that exeeds the acceptance
bandwidth of just about any NBFM radio made. What did you measure it
with?. Maybe you should contact your frequency coordinator if the owner of
the other system refuses to turn it down.
Bob NO6B
Yahoo! Groups Links
<*> To visit your group on the web, go to:
http://groups.yahoo.com/group/Repeater-Builder/
<*> To unsubscribe from this group, send an email to:
[EMAIL PROTECTED]
<*> Your use of Yahoo! Groups is subject to:
http://docs.yahoo.com/info/terms/
