Probably the LMR-400 cable is the cause. Well documented and discussed here regularly. Are the other repeaters with the same problem also using the same type cable?
Chuck WB2EDV ----- Original Message ----- From: "Bob - AF6D" <b...@af6d.com> To: <Repeater-Builder@yahoogroups.com> Sent: Monday, August 09, 2010 4:46 AM Subject: [Repeater-Builder] TKR-750 Crunchy/Grungy Weak Signal Audio > 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? > > > > > > ------------------------------------ > > > > Yahoo! Groups Links > > > -------------------------------------------------------------------------------- No virus found in this incoming message. Checked by AVG - www.avg.com Version: 9.0.851 / Virus Database: 271.1.1/3059 - Release Date: 08/08/10 13:57:00
