For those of you that are just beginning to experiment with repeater building, try using a little common sense. The manufactures would not have invested a lot of money in shielding and bypass caps if they thought they could get by with less. The MII "M" series mobile was never intended to be used as a repeater. Just because it works on some frequencies does not mean it will work on all frequencies. There is only plastic between the Tx and Rx and many common leads between the Tx and Rx. The MII "E" series was designed to function as a low power repeater with the Tx in the lower portion and the Rx in the upper portion. This provides some additional isolation between Tx and Rx. It does not eliminate the problem birdies that occur with all types of sets nor the leaky RF paths between the Tx and Rx. Possible elimination procedures are High Side Rx injection, swap out the IFAS and Hi IF boards for ones with a different IF, use more by pass caps, etc. Examine the MII repeater chassis; all leads into the RF portion of the Tx and Rx are bypassed with the older MASTR Pro connectors; there is plenty of shielding between the RF sections. If you want a good working repeater, take the time and invest some money in the proper equipment. Fred W5VAY
----- Original Message ----- From: "Jim B." <[EMAIL PROTECTED]> To: <[email protected]> Sent: Monday, February 21, 2005 10:25 AM Subject: Re: [Repeater-Builder] Re: M2 CAS > > Henry Clark, KC4KZT wrote: > > > Add me to the list who could not get a 443/448 pair to duplex in the > > same chassis. > > > > > > > > Nothing I tried would ever work. Waaaaay too much desense. That was > > about 5 years > > > > ago, and I remember someone saying then that 443/448 was a mission, > > and for some > > > > unknown reason would not duplex efficiently in the Mastr II chassis. > > I remember this coming up a few years ago-wasn't it a case of the LO in > the receiver getting close to the same freq as the tx (or one of the > multiplier stages?), and in a duplex app, the tx freq was getting into > the IF of the rx...or something like that... > > -- > Jim Barbour > WD8CHL > > > > > > > Yahoo! Groups Links > > > > > > > > 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/
