Doug, Thank you ( and all the others who have commented ). The responses are what I had hoped for when joining the reflector, a great resource. I will go over the connections and cables as suggested and re-run some tests tonight. - Mike
From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of Doug Bade Sent: Thursday, July 31, 2008 9:32 AM To: [email protected] Subject: Re: [Repeater-Builder] Curious Situation Just re-reading your post I thought I would add the following thoughts..... If 25 watts from a particular antenna is full quieting and 15 watts from the same antenna sequentially measured...is noop... this is not a duplexer problem... those 2 numbers are less than 2 db apart.... you should not be able to see or hear a difference at the full quieting zone of a receiver ( this would imply greater than 12db sinad SNR for the full quieted signal...) ... let alone drop out entirely...that is not possible.... you are overlooking something.. like the 15w radio is on simplex.... a 6-10db drop you might hear at a full quieted signal... but not 2 db... going from 25 watts to 5 for instance is a little better than 6db drop... 25 to 2.5 would be a 10db drop....but if it is a full quieting signal it still would need to drop 10+ db to be a significant drop and close to maybe 15-20db to drop out entirely....I would re-run the test and check connections and gear carefully... as the numbers do not seem to add up... 2db rf power decrease is audible in the bottom 3db of the rx... but not at 20db quieting area.... Doug KD8B >At 11:37 PM 7/29/2008, you wrote: > > >Rber's, I posted a note very early this week > >about my looking for a someplace to get a 220 > >duplexer tuned in the TAMPA area. Having not > >much luck I contacted a local MOTOROLA shop and > >paid $95 for the service. The receipt returned > >with the cans indicates that the specifications > >published by WACOM are very close. Having tuned > >these merely to incoming signals before, peaking > >them while the repeater is still in a testing > >mode, seemed to return decent results but the > >tune-up was thought to be a better idea. Not > >so.. Today's tune-up hardly was worth the wait > >or the price based on the results. While a 5 > >watt HT 10 miles away could work the repeater, > >now 25 watts from a roof top antenna is now just > >about full quieting. Fifteen watts does not > >make the repeater through the same roof top > >ground plane. Does logic dictate that we go > >back to seat of the pants tuning and cast fate to the wind? - Mike > > > > __________ NOD32 3301 (20080727) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com
