>"Bob - AF6D" <b...@...> wrote: > Why the grungy audio?
Primary Suspects: 1. LMR Feed-line (gotta go) 2. Duplexer Alignment (verify with the proper test gear) 3. Repeater Pre-selector Alignment. How did the Dealer align the receiver front end? Most people use the "peak for max signal" method and that's not the best. I reliably work our local 2500ft repeater sites from 25 plus miles distance with a 200mW power setting on an HT inside the vehicle. If the signal is not reliable, I go looking for the reason(s) it is not. s. [the story] > My 2 meter TKR has worked fine for about a year but has always had a problem > on our frequent weak signals. We're a mountain community and > CERT/RACES/ARES/Skywarn users are often on HT's. There are a couple of towers > in the neighborhood at 6,400 feet over southern California (it's kewl living > at a repeater site) and on my own gear I don't hear anything on a weak signal > beyond the norm. But on the TKR it just sounds dirty. Grungy. Crunchy. There > are commercial sites within one mile with high power paging but we've > detected no intermod. We did have a bout were grungy audio was breaking PL > and hanging until timeout. But that went away. The Wacom 6 cavity WP-642 is > tuned dead on and offers excellent isolation and rejection (at a cost of > 2-3dB loss on TX <sigh>). > > Another TKR user at a high elevation commercial site reports similar > experiences. Yet another TKR owner reported that his is excellent and yes the > audio is good. Just not for us on weak signals. He suggested perhaps an RFI > issue but from where? > > Our installation is modest and constrained only by my lack of time and funds. > My daughter is sick and I live in a hospital with her, so be gentle HI HI. > The very large guard dog watches the house. > > The antenna is a Hustler G5-144 tuned with a MFJ 259, dead on and above the > repeater through an insulated roof by about 30 feet. We have no desense. It > is fed with LMR-400 just because I haven't put hard line on it. No preamps > are installed. At 6,400 feet not much is needed. The receiver is .18uV. The > TKR hears very well compared to my FT-847 with an antenna 20 feet lower. > > Why the grungy audio? >
