No, not worried about max power through the cans. I have a db-224 at 270' with about 330' of LDF7-50a feeding it. I figure about 1db feedline loss so most of what comes out of thr cans gets to the antenna anyway. More worried about the repeater being able to repeat eveything it CAN possibly hear. I do have the PLL exciter btw. Thanks for your input! De N5NPO Norm
----- Original Message ----- From: Repeater-Builder@yahoogroups.com <Repeater-Builder@yahoogroups.com> To: Repeater-Builder@yahoogroups.com <Repeater-Builder@yahoogroups.com> Sent: Sun Jul 12 09:20:54 2009 Subject: Re: [Repeater-Builder] Notch on duplexers... How low should they go??? I agree with Eric. Unfortunately, new repeater owners sometimes can't resist tweaking the last transmit can for maximum power output. If it is a BP/BR can, there goes your receiver isolation. 73, Joe, K1ike Eric Lemmon wrote: > Norm, > > If the Q202-G duplexer is tuned exactly to spec, you should see about 1.5 dB > insertion loss on each side. That translates to about 29% loss, so with 99 > watts going in, you should see about 70 watts coming out. Since you have > measured 85 watts coming out, it means that the loops are mis-adjusted on > the TX side, and desense is almost guaranteed. When properly tuned, you > should see about 1.5 dB insertion loss on both RX and TX sides, and at least > 80 dB isolation on each side. I'm curious: What test equipment are you > using to tune this duplexer? > > 73, Eric Lemmon WB6FLY > >
